Adding upstream version 2.4.56.upstream/2.4.56

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 5080 insertions, 0 deletions

diff --git a/modules/proxy/proxy_util.c b/modules/proxy/proxy_util.c
new file mode 100644
index 0000000..8267f1b
--- /dev/null
+++ b/modules/proxy/proxy_util.c
@@ -0,0 +1,5080 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Utility routines for Apache proxy */
+#include "mod_proxy.h"
+#include "ap_mpm.h"
+#include "scoreboard.h"
+#include "apr_version.h"
+#include "apr_strings.h"
+#include "apr_hash.h"
+#include "proxy_util.h"
+#include "ajp.h"
+#include "scgi.h"
+
+#include "mod_http2.h" /* for http2_get_num_workers() */
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>         /* for getpid() */
+#endif
+
+#if APR_HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+#if (APR_MAJOR_VERSION < 2)
+#include "apr_support.h"        /* for apr_wait_for_io_or_timeout() */
+#endif
+
+APLOG_USE_MODULE(proxy);
+
+/*
+ * Opaque structure containing target server info when
+ * using a forward proxy.
+ * Up to now only used in combination with HTTP CONNECT.
+ */
+typedef struct {
+    int          use_http_connect; /* Use SSL Tunneling via HTTP CONNECT */
+    const char   *target_host;     /* Target hostname */
+    apr_port_t   target_port;      /* Target port */
+    const char   *proxy_auth;      /* Proxy authorization */
+} forward_info;
+
+/* Global balancer counter */
+int PROXY_DECLARE_DATA proxy_lb_workers = 0;
+static int lb_workers_limit = 0;
+const apr_strmatch_pattern PROXY_DECLARE_DATA *ap_proxy_strmatch_path;
+const apr_strmatch_pattern PROXY_DECLARE_DATA *ap_proxy_strmatch_domain;
+
+extern apr_global_mutex_t *proxy_mutex;
+
+static int proxy_match_ipaddr(struct dirconn_entry *This, request_rec *r);
+static int proxy_match_domainname(struct dirconn_entry *This, request_rec *r);
+static int proxy_match_hostname(struct dirconn_entry *This, request_rec *r);
+static int proxy_match_word(struct dirconn_entry *This, request_rec *r);
+static int ap_proxy_retry_worker(const char *proxy_function, proxy_worker *worker, server_rec *s);
+static proxy_worker *proxy_balancer_get_best_worker(proxy_balancer *balancer,
+                                                    request_rec *r,
+                                                    proxy_is_best_callback_fn_t *is_best,
+                                                    void *baton);
+
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(proxy, PROXY, int, create_req,
+                                   (request_rec *r, request_rec *pr), (r, pr),
+                                   OK, DECLINED)
+
+PROXY_DECLARE(apr_status_t) ap_proxy_strncpy(char *dst, const char *src,
+                                             apr_size_t dlen)
+{
+    char *thenil;
+    apr_size_t thelen;
+
+    /* special case handling */
+    if (!dlen) {
+        /* XXX: APR_ENOSPACE would be better */
+        return APR_EGENERAL;
+    }
+    if (!src) {
+        *dst = '\0';
+        return APR_SUCCESS;
+    }
+    thenil = apr_cpystrn(dst, src, dlen);
+    thelen = thenil - dst;
+    if (src[thelen] == '\0') {
+        return APR_SUCCESS;
+    }
+    return APR_EGENERAL;
+}
+
+/* already called in the knowledge that the characters are hex digits */
+PROXY_DECLARE(int) ap_proxy_hex2c(const char *x)
+{
+    int i;
+
+#if !APR_CHARSET_EBCDIC
+    int ch = x[0];
+
+    if (apr_isdigit(ch)) {
+        i = ch - '0';
+    }
+    else if (apr_isupper(ch)) {
+        i = ch - ('A' - 10);
+    }
+    else {
+        i = ch - ('a' - 10);
+    }
+    i <<= 4;
+
+    ch = x[1];
+    if (apr_isdigit(ch)) {
+        i += ch - '0';
+    }
+    else if (apr_isupper(ch)) {
+        i += ch - ('A' - 10);
+    }
+    else {
+        i += ch - ('a' - 10);
+    }
+    return i;
+#else /*APR_CHARSET_EBCDIC*/
+    /*
+     * we assume that the hex value refers to an ASCII character
+     * so convert to EBCDIC so that it makes sense locally;
+     *
+     * example:
+     *
+     * client specifies %20 in URL to refer to a space char;
+     * at this point we're called with EBCDIC "20"; after turning
+     * EBCDIC "20" into binary 0x20, we then need to assume that 0x20
+     * represents an ASCII char and convert 0x20 to EBCDIC, yielding
+     * 0x40
+     */
+    char buf[1];
+
+    if (1 == sscanf(x, "%2x", &i)) {
+        buf[0] = i & 0xFF;
+        ap_xlate_proto_from_ascii(buf, 1);
+        return buf[0];
+    }
+    else {
+        return 0;
+    }
+#endif /*APR_CHARSET_EBCDIC*/
+}
+
+PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x)
+{
+#if !APR_CHARSET_EBCDIC
+    int i;
+
+    x[0] = '%';
+    i = (ch & 0xF0) >> 4;
+    if (i >= 10) {
+        x[1] = ('A' - 10) + i;
+    }
+    else {
+        x[1] = '0' + i;
+    }
+
+    i = ch & 0x0F;
+    if (i >= 10) {
+        x[2] = ('A' - 10) + i;
+    }
+    else {
+        x[2] = '0' + i;
+    }
+#else /*APR_CHARSET_EBCDIC*/
+    static const char ntoa[] = { "0123456789ABCDEF" };
+    char buf[1];
+
+    ch &= 0xFF;
+
+    buf[0] = ch;
+    ap_xlate_proto_to_ascii(buf, 1);
+
+    x[0] = '%';
+    x[1] = ntoa[(buf[0] >> 4) & 0x0F];
+    x[2] = ntoa[buf[0] & 0x0F];
+    x[3] = '\0';
+#endif /*APR_CHARSET_EBCDIC*/
+}
+
+/*
+ * canonicalise a URL-encoded string
+ */
+
+/*
+ * Convert a URL-encoded string to canonical form.
+ * It decodes characters which need not be encoded,
+ * and encodes those which must be encoded, and does not touch
+ * those which must not be touched.
+ */
+PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len,
+                                       enum enctype t, int forcedec,
+                                       int proxyreq)
+{
+    int i, j, ch;
+    char *y;
+    char *allowed;  /* characters which should not be encoded */
+    char *reserved; /* characters which much not be en/de-coded */
+
+/*
+ * N.B. in addition to :@&=, this allows ';' in an http path
+ * and '?' in an ftp path -- this may be revised
+ *
+ * Also, it makes a '+' character in a search string reserved, as
+ * it may be form-encoded. (Although RFC 1738 doesn't allow this -
+ * it only permits ; / ? : @ = & as reserved chars.)
+ */
+    if (t == enc_path) {
+        allowed = "~$-_.+!*'(),;:@&=";
+    }
+    else if (t == enc_search) {
+        allowed = "$-_.!*'(),;:@&=";
+    }
+    else if (t == enc_user) {
+        allowed = "$-_.+!*'(),;@&=";
+    }
+    else if (t == enc_fpath) {
+        allowed = "$-_.+!*'(),?:@&=";
+    }
+    else {            /* if (t == enc_parm) */
+        allowed = "$-_.+!*'(),?/:@&=";
+    }
+
+    if (t == enc_path) {
+        reserved = "/";
+    }
+    else if (t == enc_search) {
+        reserved = "+";
+    }
+    else {
+        reserved = "";
+    }
+
+    y = apr_palloc(p, 3 * len + 1);
+
+    for (i = 0, j = 0; i < len; i++, j++) {
+/* always handle '/' first */
+        ch = x[i];
+        if (strchr(reserved, ch)) {
+            y[j] = ch;
+            continue;
+        }
+/*
+ * decode it if not already done. do not decode reverse proxied URLs
+ * unless specifically forced
+ */
+        if ((forcedec || (proxyreq && proxyreq != PROXYREQ_REVERSE)) && ch == '%') {
+            if (!apr_isxdigit(x[i + 1]) || !apr_isxdigit(x[i + 2])) {
+                return NULL;
+            }
+            ch = ap_proxy_hex2c(&x[i + 1]);
+            i += 2;
+            if (ch != 0 && strchr(reserved, ch)) {  /* keep it encoded */
+                ap_proxy_c2hex(ch, &y[j]);
+                j += 2;
+                continue;
+            }
+        }
+/* recode it, if necessary */
+        if (!apr_isalnum(ch) && !strchr(allowed, ch)) {
+            ap_proxy_c2hex(ch, &y[j]);
+            j += 2;
+        }
+        else {
+            y[j] = ch;
+        }
+    }
+    y[j] = '\0';
+    return y;
+}
+
+/*
+ * Parses network-location.
+ *    urlp           on input the URL; on output the path, after the leading /
+ *    user           NULL if no user/password permitted
+ *    password       holder for password
+ *    host           holder for host
+ *    port           port number; only set if one is supplied.
+ *
+ * Returns an error string.
+ */
+PROXY_DECLARE(char *)
+     ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp,
+            char **passwordp, char **hostp, apr_port_t *port)
+{
+    char *addr, *scope_id, *strp, *host, *url = *urlp;
+    char *user = NULL, *password = NULL;
+    apr_port_t tmp_port;
+    apr_status_t rv;
+
+    if (url[0] != '/' || url[1] != '/') {
+        return "Malformed URL";
+    }
+    host = url + 2;
+    url = strchr(host, '/');
+    if (url == NULL) {
+        url = "";
+    }
+    else {
+        *(url++) = '\0';    /* skip separating '/' */
+    }
+
+    /* find _last_ '@' since it might occur in user/password part */
+    strp = strrchr(host, '@');
+
+    if (strp != NULL) {
+        *strp = '\0';
+        user = host;
+        host = strp + 1;
+
+/* find password */
+        strp = strchr(user, ':');
+        if (strp != NULL) {
+            *strp = '\0';
+            password = ap_proxy_canonenc(p, strp + 1, strlen(strp + 1), enc_user, 1, 0);
+            if (password == NULL) {
+                return "Bad %-escape in URL (password)";
+            }
+        }
+
+        user = ap_proxy_canonenc(p, user, strlen(user), enc_user, 1, 0);
+        if (user == NULL) {
+            return "Bad %-escape in URL (username)";
+        }
+    }
+    if (userp != NULL) {
+        *userp = user;
+    }
+    if (passwordp != NULL) {
+        *passwordp = password;
+    }
+
+    /*
+     * Parse the host string to separate host portion from optional port.
+     * Perform range checking on port.
+     */
+    rv = apr_parse_addr_port(&addr, &scope_id, &tmp_port, host, p);
+    if (rv != APR_SUCCESS || addr == NULL || scope_id != NULL) {
+        return "Invalid host/port";
+    }
+    if (tmp_port != 0) { /* only update caller's port if port was specified */
+        *port = tmp_port;
+    }
+
+    ap_str_tolower(addr); /* DNS names are case-insensitive */
+
+    *urlp = url;
+    *hostp = addr;
+
+    return NULL;
+}
+
+PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message)
+{
+    apr_table_setn(r->notes, "error-notes",
+        apr_pstrcat(r->pool,
+            "The proxy server could not handle the request<p>"
+            "Reason: <strong>", ap_escape_html(r->pool, message),
+            "</strong></p>",
+            NULL));
+
+    /* Allow "error-notes" string to be printed by ap_send_error_response() */
+    apr_table_setn(r->notes, "verbose-error-to", "*");
+
+    r->status_line = apr_psprintf(r->pool, "%3.3u Proxy Error", statuscode);
+    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00898) "%s returned by %s", message,
+                  r->uri);
+    return statuscode;
+}
+
+static const char *
+     proxy_get_host_of_request(request_rec *r)
+{
+    char *url, *user = NULL, *password = NULL, *err, *host = NULL;
+    apr_port_t port;
+
+    if (r->hostname != NULL) {
+        return r->hostname;
+    }
+
+    /* Set url to the first char after "scheme://" */
+    if ((url = strchr(r->uri, ':')) == NULL || url[1] != '/' || url[2] != '/') {
+        return NULL;
+    }
+
+    url = apr_pstrdup(r->pool, &url[1]);    /* make it point to "//", which is what proxy_canon_netloc expects */
+
+    err = ap_proxy_canon_netloc(r->pool, &url, &user, &password, &host, &port);
+
+    if (err != NULL) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00899) "%s", err);
+    }
+
+    r->hostname = host;
+
+    return host;        /* ought to return the port, too */
+}
+
+/* Return TRUE if addr represents an IP address (or an IP network address) */
+PROXY_DECLARE(int) ap_proxy_is_ipaddr(struct dirconn_entry *This, apr_pool_t *p)
+{
+    const char *addr = This->name;
+    long ip_addr[4];
+    int i, quads;
+    long bits;
+
+    /*
+     * if the address is given with an explicit netmask, use that
+     * Due to a deficiency in apr_inet_addr(), it is impossible to parse
+     * "partial" addresses (with less than 4 quads) correctly, i.e.
+     * 192.168.123 is parsed as 192.168.0.123, which is not what I want.
+     * I therefore have to parse the IP address manually:
+     * if (proxy_readmask(This->name, &This->addr.s_addr, &This->mask.s_addr) == 0)
+     * addr and mask were set by proxy_readmask()
+     * return 1;
+     */
+
+    /*
+     * Parse IP addr manually, optionally allowing
+     * abbreviated net addresses like 192.168.
+     */
+
+    /* Iterate over up to 4 (dotted) quads. */
+    for (quads = 0; quads < 4 && *addr != '\0'; ++quads) {
+        char *tmp;
+
+        if (*addr == '/' && quads > 0) {  /* netmask starts here. */
+            break;
+        }
+
+        if (!apr_isdigit(*addr)) {
+            return 0;       /* no digit at start of quad */
+        }
+
+        ip_addr[quads] = strtol(addr, &tmp, 0);
+
+        if (tmp == addr) {  /* expected a digit, found something else */
+            return 0;
+        }
+
+        if (ip_addr[quads] < 0 || ip_addr[quads] > 255) {
+            /* invalid octet */
+            return 0;
+        }
+
+        addr = tmp;
+
+        if (*addr == '.' && quads != 3) {
+            ++addr;     /* after the 4th quad, a dot would be illegal */
+        }
+    }
+
+    for (This->addr.s_addr = 0, i = 0; i < quads; ++i) {
+        This->addr.s_addr |= htonl(ip_addr[i] << (24 - 8 * i));
+    }
+
+    if (addr[0] == '/' && apr_isdigit(addr[1])) {   /* net mask follows: */
+        char *tmp;
+
+        ++addr;
+
+        bits = strtol(addr, &tmp, 0);
+
+        if (tmp == addr) {   /* expected a digit, found something else */
+            return 0;
+        }
+
+        addr = tmp;
+
+        if (bits < 0 || bits > 32) { /* netmask must be between 0 and 32 */
+            return 0;
+        }
+
+    }
+    else {
+        /*
+         * Determine (i.e., "guess") netmask by counting the
+         * number of trailing .0's; reduce #quads appropriately
+         * (so that 192.168.0.0 is equivalent to 192.168.)
+         */
+        while (quads > 0 && ip_addr[quads - 1] == 0) {
+            --quads;
+        }
+
+        /* "IP Address should be given in dotted-quad form, optionally followed by a netmask (e.g., 192.168.111.0/24)"; */
+        if (quads < 1) {
+            return 0;
+        }
+
+        /* every zero-byte counts as 8 zero-bits */
+        bits = 8 * quads;
+
+        if (bits != 32) {     /* no warning for fully qualified IP address */
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00900)
+                         "Warning: NetMask not supplied with IP-Addr; guessing: %s/%ld",
+                         inet_ntoa(This->addr), bits);
+        }
+    }
+
+    This->mask.s_addr = htonl(APR_INADDR_NONE << (32 - bits));
+
+    if (*addr == '\0' && (This->addr.s_addr & ~This->mask.s_addr) != 0) {
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00901)
+                     "Warning: NetMask and IP-Addr disagree in %s/%ld",
+                     inet_ntoa(This->addr), bits);
+        This->addr.s_addr &= This->mask.s_addr;
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00902)
+                     "         Set to %s/%ld", inet_ntoa(This->addr), bits);
+    }
+
+    if (*addr == '\0') {
+        This->matcher = proxy_match_ipaddr;
+        return 1;
+    }
+    else {
+        return (*addr == '\0'); /* okay iff we've parsed the whole string */
+    }
+}
+
+/* Return TRUE if addr represents an IP address (or an IP network address) */
+static int proxy_match_ipaddr(struct dirconn_entry *This, request_rec *r)
+{
+    int i, ip_addr[4];
+    struct in_addr addr, *ip;
+    const char *host = proxy_get_host_of_request(r);
+
+    if (host == NULL) {   /* oops! */
+       return 0;
+    }
+
+    memset(&addr, '\0', sizeof addr);
+    memset(ip_addr, '\0', sizeof ip_addr);
+
+    if (4 == sscanf(host, "%d.%d.%d.%d", &ip_addr[0], &ip_addr[1], &ip_addr[2], &ip_addr[3])) {
+        for (addr.s_addr = 0, i = 0; i < 4; ++i) {
+            /* ap_proxy_is_ipaddr() already confirmed that we have
+             * a valid octet in ip_addr[i]
+             */
+            addr.s_addr |= htonl(ip_addr[i] << (24 - 8 * i));
+        }
+
+        if (This->addr.s_addr == (addr.s_addr & This->mask.s_addr)) {
+#if DEBUGGING
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00903)
+                         "1)IP-Match: %s[%s] <-> ", host, inet_ntoa(addr));
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00904)
+                         "%s/", inet_ntoa(This->addr));
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00905)
+                         "%s", inet_ntoa(This->mask));
+#endif
+            return 1;
+        }
+#if DEBUGGING
+        else {
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00906)
+                         "1)IP-NoMatch: %s[%s] <-> ", host, inet_ntoa(addr));
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00907)
+                         "%s/", inet_ntoa(This->addr));
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00908)
+                         "%s", inet_ntoa(This->mask));
+        }
+#endif
+    }
+    else {
+        struct apr_sockaddr_t *reqaddr;
+
+        if (apr_sockaddr_info_get(&reqaddr, host, APR_UNSPEC, 0, 0, r->pool)
+            != APR_SUCCESS) {
+#if DEBUGGING
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00909)
+             "2)IP-NoMatch: hostname=%s msg=Host not found", host);
+#endif
+            return 0;
+        }
+
+        /* Try to deal with multiple IP addr's for a host */
+        /* FIXME: This needs to be able to deal with IPv6 */
+        while (reqaddr) {
+            ip = (struct in_addr *) reqaddr->ipaddr_ptr;
+            if (This->addr.s_addr == (ip->s_addr & This->mask.s_addr)) {
+#if DEBUGGING
+                ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00910)
+                             "3)IP-Match: %s[%s] <-> ", host, inet_ntoa(*ip));
+                ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00911)
+                             "%s/", inet_ntoa(This->addr));
+                ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00912)
+                             "%s", inet_ntoa(This->mask));
+#endif
+                return 1;
+            }
+#if DEBUGGING
+            else {
+                ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00913)
+                             "3)IP-NoMatch: %s[%s] <-> ", host, inet_ntoa(*ip));
+                ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00914)
+                             "%s/", inet_ntoa(This->addr));
+                ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00915)
+                             "%s", inet_ntoa(This->mask));
+            }
+#endif
+            reqaddr = reqaddr->next;
+        }
+    }
+
+    return 0;
+}
+
+/* Return TRUE if addr represents a domain name */
+PROXY_DECLARE(int) ap_proxy_is_domainname(struct dirconn_entry *This, apr_pool_t *p)
+{
+    char *addr = This->name;
+    int i;
+
+    /* Domain name must start with a '.' */
+    if (addr[0] != '.') {
+        return 0;
+    }
+
+    /* rfc1035 says DNS names must consist of "[-a-zA-Z0-9]" and '.' */
+    for (i = 0; apr_isalnum(addr[i]) || addr[i] == '-' || addr[i] == '.'; ++i) {
+        continue;
+    }
+
+#if 0
+    if (addr[i] == ':') {
+    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(03234)
+                     "@@@@ handle optional port in proxy_is_domainname()");
+    /* @@@@ handle optional port */
+    }
+#endif
+
+    if (addr[i] != '\0') {
+        return 0;
+    }
+
+    /* Strip trailing dots */
+    for (i = strlen(addr) - 1; i > 0 && addr[i] == '.'; --i) {
+        addr[i] = '\0';
+    }
+
+    This->matcher = proxy_match_domainname;
+    return 1;
+}
+
+/* Return TRUE if host "host" is in domain "domain" */
+static int proxy_match_domainname(struct dirconn_entry *This, request_rec *r)
+{
+    const char *host = proxy_get_host_of_request(r);
+    int d_len = strlen(This->name), h_len;
+
+    if (host == NULL) {      /* some error was logged already */
+        return 0;
+    }
+
+    h_len = strlen(host);
+
+    /* @@@ do this within the setup? */
+    /* Ignore trailing dots in domain comparison: */
+    while (d_len > 0 && This->name[d_len - 1] == '.') {
+        --d_len;
+    }
+    while (h_len > 0 && host[h_len - 1] == '.') {
+        --h_len;
+    }
+    return h_len > d_len
+        && strncasecmp(&host[h_len - d_len], This->name, d_len) == 0;
+}
+
+/* Return TRUE if host represents a host name */
+PROXY_DECLARE(int) ap_proxy_is_hostname(struct dirconn_entry *This, apr_pool_t *p)
+{
+    struct apr_sockaddr_t *addr;
+    char *host = This->name;
+    int i;
+
+    /* Host names must not start with a '.' */
+    if (host[0] == '.') {
+        return 0;
+    }
+    /* rfc1035 says DNS names must consist of "[-a-zA-Z0-9]" and '.' */
+    for (i = 0; apr_isalnum(host[i]) || host[i] == '-' || host[i] == '.'; ++i);
+
+    if (host[i] != '\0' || apr_sockaddr_info_get(&addr, host, APR_UNSPEC, 0, 0, p) != APR_SUCCESS) {
+        return 0;
+    }
+
+    This->hostaddr = addr;
+
+    /* Strip trailing dots */
+    for (i = strlen(host) - 1; i > 0 && host[i] == '.'; --i) {
+        host[i] = '\0';
+    }
+
+    This->matcher = proxy_match_hostname;
+    return 1;
+}
+
+/* Return TRUE if host "host" is equal to host2 "host2" */
+static int proxy_match_hostname(struct dirconn_entry *This, request_rec *r)
+{
+    char *host = This->name;
+    const char *host2 = proxy_get_host_of_request(r);
+    int h2_len;
+    int h1_len;
+
+    if (host == NULL || host2 == NULL) {
+        return 0; /* oops! */
+    }
+
+    h2_len = strlen(host2);
+    h1_len = strlen(host);
+
+#if 0
+    struct apr_sockaddr_t *addr = *This->hostaddr;
+
+    /* Try to deal with multiple IP addr's for a host */
+    while (addr) {
+        if (addr->ipaddr_ptr == ? ? ? ? ? ? ? ? ? ? ? ? ?)
+            return 1;
+        addr = addr->next;
+    }
+#endif
+
+    /* Ignore trailing dots in host2 comparison: */
+    while (h2_len > 0 && host2[h2_len - 1] == '.') {
+        --h2_len;
+    }
+    while (h1_len > 0 && host[h1_len - 1] == '.') {
+        --h1_len;
+    }
+    return h1_len == h2_len
+        && strncasecmp(host, host2, h1_len) == 0;
+}
+
+/* Return TRUE if addr is to be matched as a word */
+PROXY_DECLARE(int) ap_proxy_is_word(struct dirconn_entry *This, apr_pool_t *p)
+{
+    This->matcher = proxy_match_word;
+    return 1;
+}
+
+/* Return TRUE if string "str2" occurs literally in "str1" */
+static int proxy_match_word(struct dirconn_entry *This, request_rec *r)
+{
+    const char *host = proxy_get_host_of_request(r);
+    return host != NULL && ap_strstr_c(host, This->name) != NULL;
+}
+
+/* Backwards-compatible interface. */
+PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf,
+                             apr_sockaddr_t *uri_addr)
+{
+    return ap_proxy_checkproxyblock2(r, conf, uri_addr->hostname, uri_addr);
+}
+
+#define MAX_IP_STR_LEN (46)
+
+PROXY_DECLARE(int) ap_proxy_checkproxyblock2(request_rec *r, proxy_server_conf *conf,
+                                             const char *hostname, apr_sockaddr_t *addr)
+{
+    int j;
+
+    /* XXX FIXME: conf->noproxies->elts is part of an opaque structure */
+    for (j = 0; j < conf->noproxies->nelts; j++) {
+        struct noproxy_entry *npent = (struct noproxy_entry *) conf->noproxies->elts;
+        struct apr_sockaddr_t *conf_addr;
+
+        ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                      "checking remote machine [%s] against [%s]",
+                      hostname, npent[j].name);
+        if (ap_strstr_c(hostname, npent[j].name) || npent[j].name[0] == '*') {
+            ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(00916)
+                          "connect to remote machine %s blocked: name %s "
+                          "matched", hostname, npent[j].name);
+            return HTTP_FORBIDDEN;
+        }
+
+        /* No IP address checks if no IP address was passed in,
+         * i.e. the forward address proxy case, where this server does
+         * not resolve the hostname.  */
+        if (!addr)
+            continue;
+
+        for (conf_addr = npent[j].addr; conf_addr; conf_addr = conf_addr->next) {
+            char caddr[MAX_IP_STR_LEN], uaddr[MAX_IP_STR_LEN];
+            apr_sockaddr_t *uri_addr;
+
+            if (apr_sockaddr_ip_getbuf(caddr, sizeof caddr, conf_addr))
+                continue;
+
+            for (uri_addr = addr; uri_addr; uri_addr = uri_addr->next) {
+                if (apr_sockaddr_ip_getbuf(uaddr, sizeof uaddr, uri_addr))
+                    continue;
+                ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                              "ProxyBlock comparing %s and %s", caddr, uaddr);
+                if (!strcmp(caddr, uaddr)) {
+                    ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(00917)
+                                  "connect to remote machine %s blocked: "
+                                  "IP %s matched", hostname, caddr);
+                    return HTTP_FORBIDDEN;
+                }
+            }
+        }
+    }
+
+    return OK;
+}
+
+/* set up the minimal filter set */
+PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r)
+{
+    ap_add_input_filter("HTTP_IN", NULL, r, c);
+    return OK;
+}
+
+PROXY_DECLARE(const char *) ap_proxy_location_reverse_map(request_rec *r,
+                              proxy_dir_conf *conf, const char *url)
+{
+    proxy_req_conf *rconf;
+    struct proxy_alias *ent;
+    int i, l1, l1_orig, l2;
+    char *u;
+
+    /*
+     * XXX FIXME: Make sure this handled the ambiguous case of the :<PORT>
+     * after the hostname
+     * XXX FIXME: Ensure the /uri component is a case sensitive match
+     */
+    if (r->proxyreq != PROXYREQ_REVERSE) {
+        return url;
+    }
+
+    l1_orig = strlen(url);
+    if (conf->interpolate_env == 1) {
+        rconf = ap_get_module_config(r->request_config, &proxy_module);
+        ent = (struct proxy_alias *)rconf->raliases->elts;
+    }
+    else {
+        ent = (struct proxy_alias *)conf->raliases->elts;
+    }
+    for (i = 0; i < conf->raliases->nelts; i++) {
+        proxy_server_conf *sconf = (proxy_server_conf *)
+            ap_get_module_config(r->server->module_config, &proxy_module);
+        proxy_balancer *balancer;
+        const char *real = ent[i].real;
+
+        /* Restore the url length, if it had been changed by the code below */
+        l1 = l1_orig;
+
+        /*
+         * First check if mapping against a balancer and see
+         * if we have such a entity. If so, then we need to
+         * find the particulars of the actual worker which may
+         * or may not be the right one... basically, we need
+         * to find which member actually handled this request.
+         */
+        if (ap_proxy_valid_balancer_name((char *)real, 0) &&
+            (balancer = ap_proxy_get_balancer(r->pool, sconf, real, 1))) {
+            int n, l3 = 0;
+            proxy_worker **worker = (proxy_worker **)balancer->workers->elts;
+            const char *urlpart = ap_strchr_c(real + sizeof(BALANCER_PREFIX) - 1, '/');
+            if (urlpart) {
+                if (!urlpart[1])
+                    urlpart = NULL;
+                else
+                    l3 = strlen(urlpart);
+            }
+            /* The balancer comparison is a bit trickier.  Given the context
+             *   BalancerMember balancer://alias http://example.com/foo
+             *   ProxyPassReverse /bash balancer://alias/bar
+             * translate url http://example.com/foo/bar/that to /bash/that
+             */
+            for (n = 0; n < balancer->workers->nelts; n++) {
+                l2 = strlen((*worker)->s->name_ex);
+                if (urlpart) {
+                    /* urlpart (l3) assuredly starts with its own '/' */
+                    if ((*worker)->s->name_ex[l2 - 1] == '/')
+                        --l2;
+                    if (l1 >= l2 + l3
+                            && strncasecmp((*worker)->s->name_ex, url, l2) == 0
+                            && strncmp(urlpart, url + l2, l3) == 0) {
+                        u = apr_pstrcat(r->pool, ent[i].fake, &url[l2 + l3],
+                                        NULL);
+                        return ap_is_url(u) ? u : ap_construct_url(r->pool, u, r);
+                    }
+                }
+                else if (l1 >= l2 && strncasecmp((*worker)->s->name_ex, url, l2) == 0) {
+                    /* edge case where fake is just "/"... avoid double slash */
+                    if ((ent[i].fake[0] == '/') && (ent[i].fake[1] == 0) && (url[l2] == '/')) {
+                        u = apr_pstrdup(r->pool, &url[l2]);
+                    } else {
+                        u = apr_pstrcat(r->pool, ent[i].fake, &url[l2], NULL);
+                    }
+                    return ap_is_url(u) ? u : ap_construct_url(r->pool, u, r);
+                }
+                worker++;
+            }
+        }
+        else {
+            const char *part = url;
+            l2 = strlen(real);
+            if (real[0] == '/') {
+                part = ap_strstr_c(url, "://");
+                if (part) {
+                    part = ap_strchr_c(part+3, '/');
+                    if (part) {
+                        l1 = strlen(part);
+                    }
+                    else {
+                        part = url;
+                    }
+                }
+                else {
+                    part = url;
+                }
+            }
+            if (l2 > 0 && l1 >= l2 && strncasecmp(real, part, l2) == 0) {
+                u = apr_pstrcat(r->pool, ent[i].fake, &part[l2], NULL);
+                return ap_is_url(u) ? u : ap_construct_url(r->pool, u, r);
+            }
+        }
+    }
+
+    return url;
+}
+
+/*
+ * Cookies are a bit trickier to match: we've got two substrings to worry
+ * about, and we can't just find them with strstr 'cos of case.  Regexp
+ * matching would be an easy fix, but for better consistency with all the
+ * other matches we'll refrain and use apr_strmatch to find path=/domain=
+ * and stick to plain strings for the config values.
+ */
+PROXY_DECLARE(const char *) ap_proxy_cookie_reverse_map(request_rec *r,
+                              proxy_dir_conf *conf, const char *str)
+{
+    proxy_req_conf *rconf = ap_get_module_config(r->request_config,
+                                                 &proxy_module);
+    struct proxy_alias *ent;
+    apr_size_t len = strlen(str);
+    const char *newpath = NULL;
+    const char *newdomain = NULL;
+    const char *pathp;
+    const char *domainp;
+    const char *pathe = NULL;
+    const char *domaine = NULL;
+    apr_size_t l1, l2, poffs = 0, doffs = 0;
+    int i;
+    int ddiff = 0;
+    int pdiff = 0;
+    char *tmpstr, *tmpstr_orig, *token, *last, *ret;
+
+    if (r->proxyreq != PROXYREQ_REVERSE) {
+        return str;
+    }
+
+   /*
+    * Find the match and replacement, but save replacing until we've done
+    * both path and domain so we know the new strlen
+    */
+    tmpstr_orig = tmpstr = apr_pstrdup(r->pool, str);
+    while ((token = apr_strtok(tmpstr, ";", &last))) {
+        /* skip leading spaces */
+        while (apr_isspace(*token)) {
+            ++token;
+        }
+
+        if (ap_cstr_casecmpn("path=", token, 5) == 0) {
+            pathp = token + 5;
+            poffs = pathp - tmpstr_orig;
+            l1 = strlen(pathp);
+            pathe = str + poffs + l1;
+            if (conf->interpolate_env == 1) {
+                ent = (struct proxy_alias *)rconf->cookie_paths->elts;
+            }
+            else {
+                ent = (struct proxy_alias *)conf->cookie_paths->elts;
+            }
+            for (i = 0; i < conf->cookie_paths->nelts; i++) {
+                l2 = strlen(ent[i].fake);
+                if (l1 >= l2 && strncmp(ent[i].fake, pathp, l2) == 0) {
+                    newpath = ent[i].real;
+                    pdiff = strlen(newpath) - l1;
+                    break;
+                }
+            }
+        }
+        else if (ap_cstr_casecmpn("domain=", token, 7) == 0) {
+            domainp = token + 7;
+            doffs = domainp - tmpstr_orig;
+            l1 = strlen(domainp);
+            domaine = str + doffs + l1;
+            if (conf->interpolate_env == 1) {
+                ent = (struct proxy_alias *)rconf->cookie_domains->elts;
+            }
+            else {
+                ent = (struct proxy_alias *)conf->cookie_domains->elts;
+            }
+            for (i = 0; i < conf->cookie_domains->nelts; i++) {
+                l2 = strlen(ent[i].fake);
+                if (l1 >= l2 && strncasecmp(ent[i].fake, domainp, l2) == 0) {
+                    newdomain = ent[i].real;
+                    ddiff = strlen(newdomain) - l1;
+                    break;
+                }
+            }
+        }
+
+        /* Iterate the remaining tokens using apr_strtok(NULL, ...) */
+        tmpstr = NULL;
+    }
+
+    if (newpath) {
+        ret = apr_palloc(r->pool, len + pdiff + ddiff + 1);
+        l1 = strlen(newpath);
+        if (newdomain) {
+            l2 = strlen(newdomain);
+            if (doffs > poffs) {
+                memcpy(ret, str, poffs);
+                memcpy(ret + poffs, newpath, l1);
+                memcpy(ret + poffs + l1, pathe, str + doffs - pathe);
+                memcpy(ret + doffs + pdiff, newdomain, l2);
+                strcpy(ret + doffs + pdiff + l2, domaine);
+            }
+            else {
+                memcpy(ret, str, doffs) ;
+                memcpy(ret + doffs, newdomain, l2);
+                memcpy(ret + doffs + l2, domaine, str + poffs - domaine);
+                memcpy(ret + poffs + ddiff, newpath, l1);
+                strcpy(ret + poffs + ddiff + l1, pathe);
+            }
+        }
+        else {
+            memcpy(ret, str, poffs);
+            memcpy(ret + poffs, newpath, l1);
+            strcpy(ret + poffs + l1, pathe);
+        }
+    }
+    else if (newdomain) {
+            ret = apr_palloc(r->pool, len + ddiff + 1);
+            l2 = strlen(newdomain);
+            memcpy(ret, str, doffs);
+            memcpy(ret + doffs, newdomain, l2);
+            strcpy(ret + doffs + l2, domaine);
+    }
+    else {
+        ret = (char *)str; /* no change */
+    }
+
+    return ret;
+}
+
+/*
+ * BALANCER related...
+ */
+
+/*
+ * verifies that the balancer name conforms to standards.
+ */
+PROXY_DECLARE(int) ap_proxy_valid_balancer_name(char *name, int i)
+{
+    if (!i)
+        i = sizeof(BALANCER_PREFIX)-1;
+    return (!ap_cstr_casecmpn(name, BALANCER_PREFIX, i));
+}
+
+
+PROXY_DECLARE(proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p,
+                                                      proxy_server_conf *conf,
+                                                      const char *url,
+                                                      int care)
+{
+    proxy_balancer *balancer;
+    char *c, *uri = apr_pstrdup(p, url);
+    int i;
+    proxy_hashes hash;
+
+    c = strchr(uri, ':');
+    if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0') {
+        return NULL;
+    }
+    /* remove path from uri */
+    if ((c = strchr(c + 3, '/'))) {
+        *c = '\0';
+    }
+    ap_str_tolower(uri);
+    hash.def = ap_proxy_hashfunc(uri, PROXY_HASHFUNC_DEFAULT);
+    hash.fnv = ap_proxy_hashfunc(uri, PROXY_HASHFUNC_FNV);
+    balancer = (proxy_balancer *)conf->balancers->elts;
+    for (i = 0; i < conf->balancers->nelts; i++) {
+        if (balancer->hash.def == hash.def && balancer->hash.fnv == hash.fnv) {
+            if (!care || !balancer->s->inactive) {
+                return balancer;
+            }
+        }
+        balancer++;
+    }
+    return NULL;
+}
+
+
+PROXY_DECLARE(char *) ap_proxy_update_balancer(apr_pool_t *p,
+                                                proxy_balancer *balancer,
+                                                const char *url)
+{
+    apr_uri_t puri;
+    if (!url) {
+        return NULL;
+    }
+    if (apr_uri_parse(p, url, &puri) != APR_SUCCESS) {
+        return apr_psprintf(p, "unable to parse: %s", url);
+    }
+    if (puri.path && PROXY_STRNCPY(balancer->s->vpath, puri.path) != APR_SUCCESS) {
+        return apr_psprintf(p, "balancer %s front-end virtual-path (%s) too long",
+                            balancer->s->name, puri.path);
+    }
+    if (puri.hostname && PROXY_STRNCPY(balancer->s->vhost, puri.hostname) != APR_SUCCESS) {
+        return apr_psprintf(p, "balancer %s front-end vhost name (%s) too long",
+                            balancer->s->name, puri.hostname);
+    }
+    return NULL;
+}
+
+#define PROXY_UNSET_NONCE '\n'
+
+PROXY_DECLARE(char *) ap_proxy_define_balancer(apr_pool_t *p,
+                                               proxy_balancer **balancer,
+                                               proxy_server_conf *conf,
+                                               const char *url,
+                                               const char *alias,
+                                               int do_malloc)
+{
+    proxy_balancer_method *lbmethod;
+    proxy_balancer_shared *bshared;
+    char *c, *q, *uri = apr_pstrdup(p, url);
+    const char *sname;
+
+    /* We should never get here without a valid BALANCER_PREFIX... */
+
+    c = strchr(uri, ':');
+    if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0')
+        return apr_psprintf(p, "Bad syntax for a balancer name (%s)", uri);
+    /* remove path from uri */
+    if ((q = strchr(c + 3, '/')))
+        *q = '\0';
+
+    ap_str_tolower(uri);
+    *balancer = apr_array_push(conf->balancers);
+    memset(*balancer, 0, sizeof(proxy_balancer));
+
+    /*
+     * NOTE: The default method is byrequests - if it doesn't
+     * exist, that's OK at this time. We check when we share and sync
+     */
+    lbmethod = ap_lookup_provider(PROXY_LBMETHOD, "byrequests", "0");
+    (*balancer)->lbmethod = lbmethod;
+    
+    (*balancer)->workers = apr_array_make(p, 5, sizeof(proxy_worker *));
+#if APR_HAS_THREADS
+    (*balancer)->gmutex = NULL;
+    (*balancer)->tmutex = NULL;
+#endif
+
+    if (do_malloc)
+        bshared = ap_malloc(sizeof(proxy_balancer_shared));
+    else
+        bshared = apr_palloc(p, sizeof(proxy_balancer_shared));
+
+    memset(bshared, 0, sizeof(proxy_balancer_shared));
+
+    bshared->was_malloced = (do_malloc != 0);
+    PROXY_STRNCPY(bshared->lbpname, "byrequests");
+    if (PROXY_STRNCPY(bshared->name, uri) != APR_SUCCESS) {
+        if (do_malloc) free(bshared);
+        return apr_psprintf(p, "balancer name (%s) too long", uri);
+    }
+    (*balancer)->lbmethod_set = 1;
+
+    /*
+     * We do the below for verification. The real sname will be
+     * done post_config
+     */
+    ap_pstr2_alnum(p, bshared->name + sizeof(BALANCER_PREFIX) - 1,
+                   &sname);
+    sname = apr_pstrcat(p, conf->id, "_", sname, NULL);
+    if (PROXY_STRNCPY(bshared->sname, sname) != APR_SUCCESS) {
+        if (do_malloc) free(bshared);
+        return apr_psprintf(p, "balancer safe-name (%s) too long", sname);
+    }
+    bshared->hash.def = ap_proxy_hashfunc(bshared->name, PROXY_HASHFUNC_DEFAULT);
+    bshared->hash.fnv = ap_proxy_hashfunc(bshared->name, PROXY_HASHFUNC_FNV);
+    (*balancer)->hash = bshared->hash;
+
+    bshared->forcerecovery = 1;
+    bshared->sticky_separator = '.';
+    *bshared->nonce = PROXY_UNSET_NONCE;  /* impossible valid input */
+
+    (*balancer)->s = bshared;
+    (*balancer)->sconf = conf;
+
+    return ap_proxy_update_balancer(p, *balancer, alias);
+}
+
+/*
+ * Create an already defined balancer and free up memory.
+ */
+PROXY_DECLARE(apr_status_t) ap_proxy_share_balancer(proxy_balancer *balancer,
+                                                    proxy_balancer_shared *shm,
+                                                    int i)
+{
+    apr_status_t rv = APR_SUCCESS;
+    proxy_balancer_method *lbmethod;
+    char *action = "copying";
+    if (!shm || !balancer->s)
+        return APR_EINVAL;
+
+    if ((balancer->s->hash.def != shm->hash.def) ||
+        (balancer->s->hash.fnv != shm->hash.fnv)) {
+        memcpy(shm, balancer->s, sizeof(proxy_balancer_shared));
+        if (balancer->s->was_malloced)
+            free(balancer->s);
+    } else {
+        action = "re-using";
+    }
+    balancer->s = shm;
+    balancer->s->index = i;
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02337)
+                 "%s shm[%d] (0x%pp) for %s", action, i, (void *)shm,
+                 balancer->s->name);
+    /* the below should always succeed */
+    lbmethod = ap_lookup_provider(PROXY_LBMETHOD, balancer->s->lbpname, "0");
+    if (lbmethod) {
+        balancer->lbmethod = lbmethod;
+        balancer->lbmethod_set = 1;
+    } else {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, 0, ap_server_conf, APLOGNO(02432)
+                     "Cannot find LB Method: %s", balancer->s->lbpname);
+        return APR_EINVAL;
+    }
+    if (*balancer->s->nonce == PROXY_UNSET_NONCE) {
+        char nonce[APR_UUID_FORMATTED_LENGTH + 1];
+        apr_uuid_t uuid;
+
+        /* Generate a pseudo-UUID from the PRNG to use as a nonce for
+         * the lifetime of the process. uuid.data is a char array so
+         * this is an adequate substitute for apr_uuid_get(). */
+        ap_random_insecure_bytes(uuid.data, sizeof uuid.data);
+        apr_uuid_format(nonce, &uuid);
+        rv = PROXY_STRNCPY(balancer->s->nonce, nonce);
+    }
+    return rv;
+}
+
+PROXY_DECLARE(apr_status_t) ap_proxy_initialize_balancer(proxy_balancer *balancer, server_rec *s, apr_pool_t *p)
+{
+#if APR_HAS_THREADS
+    apr_status_t rv = APR_SUCCESS;
+#endif
+    ap_slotmem_provider_t *storage = balancer->storage;
+    apr_size_t size;
+    unsigned int num;
+
+    if (!storage) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00918)
+                     "no provider for %s", balancer->s->name);
+        return APR_EGENERAL;
+    }
+    /*
+     * for each balancer we need to init the global
+     * mutex and then attach to the shared worker shm
+     */
+    if (!balancer->gmutex) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00919)
+                     "no mutex %s", balancer->s->name);
+        return APR_EGENERAL;
+    }
+
+    /* Re-open the mutex for the child. */
+    rv = apr_global_mutex_child_init(&(balancer->gmutex),
+                                     apr_global_mutex_lockfile(balancer->gmutex),
+                                     p);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s, APLOGNO(00920)
+                     "Failed to reopen mutex %s in child",
+                     balancer->s->name);
+        return rv;
+    }
+
+    /* now attach */
+    storage->attach(&(balancer->wslot), balancer->s->sname, &size, &num, p);
+    if (!balancer->wslot) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00921) "slotmem_attach failed");
+        return APR_EGENERAL;
+    }
+    if (balancer->lbmethod && balancer->lbmethod->reset)
+        balancer->lbmethod->reset(balancer, s);
+
+#if APR_HAS_THREADS
+    if (balancer->tmutex == NULL) {
+        rv = apr_thread_mutex_create(&(balancer->tmutex), APR_THREAD_MUTEX_DEFAULT, p);
+        if (rv != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00922)
+                         "can not create balancer thread mutex");
+            return rv;
+        }
+    }
+#endif
+    return APR_SUCCESS;
+}
+
+static proxy_worker *proxy_balancer_get_best_worker(proxy_balancer *balancer,
+                                                    request_rec *r,
+                                                    proxy_is_best_callback_fn_t *is_best,
+                                                    void *baton)
+{
+    int i = 0;
+    int cur_lbset = 0;
+    int max_lbset = 0;
+    int unusable_workers = 0;
+    apr_pool_t *tpool = NULL;
+    apr_array_header_t *spares = NULL;
+    apr_array_header_t *standbys = NULL;
+    proxy_worker *worker = NULL;
+    proxy_worker *best_worker = NULL;
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, APLOGNO(10122)
+                 "proxy: Entering %s for BALANCER (%s)",
+                 balancer->lbmethod->name, balancer->s->name);
+
+    apr_pool_create(&tpool, r->pool);
+    apr_pool_tag(tpool, "proxy_lb_best");
+
+    spares = apr_array_make(tpool, 1, sizeof(proxy_worker*));
+    standbys = apr_array_make(tpool, 1, sizeof(proxy_worker*));
+
+    /* Process lbsets in order, only replacing unusable workers in a given lbset
+     * with available spares from the same lbset. Hot standbys will be used as a
+     * last resort when all other workers and spares are unavailable.
+     */
+    for (cur_lbset = 0; !best_worker && (cur_lbset <= max_lbset); cur_lbset++) {
+        unusable_workers = 0;
+        apr_array_clear(spares);
+        apr_array_clear(standbys);
+
+        for (i = 0; i < balancer->workers->nelts; i++) {
+            worker = APR_ARRAY_IDX(balancer->workers, i, proxy_worker *);
+
+            if (worker->s->lbset > max_lbset) {
+                max_lbset = worker->s->lbset;
+            }
+
+            if (worker->s->lbset != cur_lbset) {
+                continue;
+            }
+
+            /* A draining worker that is neither a spare nor a standby should be
+             * considered unusable to be replaced by spares.
+             */
+            if (PROXY_WORKER_IS_DRAINING(worker)) {
+                if (!PROXY_WORKER_IS_SPARE(worker) && !PROXY_WORKER_IS_STANDBY(worker)) {
+                    unusable_workers++;
+                }
+
+                continue;
+            }
+
+            /* If the worker is in error state run retry on that worker. It will
+             * be marked as operational if the retry timeout is elapsed.  The
+             * worker might still be unusable, but we try anyway.
+             */
+            if (!PROXY_WORKER_IS_USABLE(worker)) {
+                ap_proxy_retry_worker("BALANCER", worker, r->server);
+            }
+
+            if (PROXY_WORKER_IS_SPARE(worker)) {
+                if (PROXY_WORKER_IS_USABLE(worker)) {
+                    APR_ARRAY_PUSH(spares, proxy_worker *) = worker;
+                }
+            }
+            else if (PROXY_WORKER_IS_STANDBY(worker)) {
+                if (PROXY_WORKER_IS_USABLE(worker)) {
+                    APR_ARRAY_PUSH(standbys, proxy_worker *) = worker;
+                }
+            }
+            else if (PROXY_WORKER_IS_USABLE(worker)) {
+              if (is_best(worker, best_worker, baton)) {
+                best_worker = worker;
+              }
+            }
+            else {
+                unusable_workers++;
+            }
+        }
+
+        /* Check if any spares are best. */
+        for (i = 0; (i < spares->nelts) && (i < unusable_workers); i++) {
+          worker = APR_ARRAY_IDX(spares, i, proxy_worker *);
+
+          if (is_best(worker, best_worker, baton)) {
+            best_worker = worker;
+          }
+        }
+
+        /* If no workers are available, use the standbys. */
+        if (!best_worker) {
+            for (i = 0; i < standbys->nelts; i++) {
+              worker = APR_ARRAY_IDX(standbys, i, proxy_worker *);
+
+              if (is_best(worker, best_worker, baton)) {
+                best_worker = worker;
+              }
+            }
+        }
+    }
+
+    apr_pool_destroy(tpool);
+
+    if (best_worker) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, APLOGNO(10123)
+                     "proxy: %s selected worker \"%s\" : busy %" APR_SIZE_T_FMT " : lbstatus %d",
+                     balancer->lbmethod->name, best_worker->s->name_ex,
+                     best_worker->s->busy, best_worker->s->lbstatus);
+    }
+
+    return best_worker;
+}
+
+PROXY_DECLARE(proxy_worker *) ap_proxy_balancer_get_best_worker(proxy_balancer *balancer,
+                                                                request_rec *r,
+                                                                proxy_is_best_callback_fn_t *is_best,
+                                                                void *baton)
+{
+    return proxy_balancer_get_best_worker(balancer, r, is_best, baton);
+}
+
+/*
+ * CONNECTION related...
+ */
+
+static void socket_cleanup(proxy_conn_rec *conn)
+{
+    conn->sock = NULL;
+    conn->tmp_bb = NULL;
+    conn->connection = NULL;
+    conn->ssl_hostname = NULL;
+    apr_pool_clear(conn->scpool);
+}
+
+static apr_status_t conn_pool_cleanup(void *theworker)
+{
+    ((proxy_worker *)theworker)->cp = NULL;
+    return APR_SUCCESS;
+}
+
+static void init_conn_pool(apr_pool_t *p, proxy_worker *worker)
+{
+    apr_pool_t *pool;
+    apr_pool_t *dns_pool;
+    proxy_conn_pool *cp;
+
+    /*
+     * Create a connection pool's subpool.
+     * This pool is used for connection recycling.
+     * Once the worker is added it is never removed but
+     * it can be disabled.
+     */
+    apr_pool_create(&pool, p);
+    apr_pool_tag(pool, "proxy_worker_cp");
+    /*
+     * Create a subpool of the connection pool for worker
+     * scoped DNS resolutions. This is needed to avoid race
+     * conditions in using the connection pool by multiple
+     * threads during ramp up.
+     */
+    apr_pool_create(&dns_pool, pool);
+    apr_pool_tag(dns_pool, "proxy_worker_dns");
+    /*
+     * Alloc from the same pool as worker.
+     * proxy_conn_pool is permanently attached to the worker.
+     */
+    cp = (proxy_conn_pool *)apr_pcalloc(p, sizeof(proxy_conn_pool));
+    cp->pool = pool;
+    cp->dns_pool = dns_pool;
+    worker->cp = cp;
+
+    apr_pool_pre_cleanup_register(p, worker, conn_pool_cleanup);
+}
+
+PROXY_DECLARE(int) ap_proxy_connection_reusable(proxy_conn_rec *conn)
+{
+    proxy_worker *worker = conn->worker;
+
+    return ! (conn->close || !worker->s->is_address_reusable || worker->s->disablereuse);
+}
+
+static apr_status_t connection_cleanup(void *theconn)
+{
+    proxy_conn_rec *conn = (proxy_conn_rec *)theconn;
+    proxy_worker *worker = conn->worker;
+
+    if (conn->r) {
+        apr_pool_destroy(conn->r->pool);
+        conn->r = NULL;
+    }
+
+    /* Sanity check: Did we already return the pooled connection? */
+    if (conn->inreslist) {
+        ap_log_perror(APLOG_MARK, APLOG_ERR, 0, conn->pool, APLOGNO(00923)
+                      "Pooled connection 0x%pp for worker %s has been"
+                      " already returned to the connection pool.", conn,
+                      ap_proxy_worker_name(conn->pool, worker));
+        return APR_SUCCESS;
+    }
+
+    /* determine if the connection need to be closed */
+    if (!worker->s->is_address_reusable || worker->s->disablereuse) {
+        apr_pool_t *p = conn->pool;
+        apr_pool_clear(p);
+        conn = apr_pcalloc(p, sizeof(proxy_conn_rec));
+        conn->pool = p;
+        conn->worker = worker;
+        apr_pool_create(&(conn->scpool), p);
+        apr_pool_tag(conn->scpool, "proxy_conn_scpool");
+    }
+    else if (conn->close
+                || (conn->connection
+                    && conn->connection->keepalive == AP_CONN_CLOSE)) {
+        socket_cleanup(conn);
+        conn->close = 0;
+    }
+    else if (conn->is_ssl) {
+        /* Unbind/reset the SSL connection dir config (sslconn->dc) from
+         * r->per_dir_config, r will likely get destroyed before this proxy
+         * conn is reused.
+         */
+        ap_proxy_ssl_engine(conn->connection, worker->section_config, 1);
+    }
+
+    if (worker->s->hmax && worker->cp->res) {
+        conn->inreslist = 1;
+        apr_reslist_release(worker->cp->res, (void *)conn);
+    }
+    else
+    {
+        worker->cp->conn = conn;
+    }
+
+    /* Always return the SUCCESS */
+    return APR_SUCCESS;
+}
+
+/* DEPRECATED */
+PROXY_DECLARE(apr_status_t) ap_proxy_ssl_connection_cleanup(proxy_conn_rec *conn,
+                                                            request_rec *r)
+{
+    apr_status_t rv;
+
+    /*
+     * If we have an existing SSL connection it might be possible that the
+     * server sent some SSL message we have not read so far (e.g. an SSL
+     * shutdown message if the server closed the keepalive connection while
+     * the connection was held unused in our pool).
+     * So ensure that if present (=> APR_NONBLOCK_READ) it is read and
+     * processed. We don't expect any data to be in the returned brigade.
+     */
+    if (conn->sock && conn->connection) {
+        rv = ap_get_brigade(conn->connection->input_filters, conn->tmp_bb,
+                            AP_MODE_READBYTES, APR_NONBLOCK_READ,
+                            HUGE_STRING_LEN);
+        if (!APR_BRIGADE_EMPTY(conn->tmp_bb)) {
+            apr_off_t len;
+
+            rv = apr_brigade_length(conn->tmp_bb, 0, &len);
+            ap_log_rerror(APLOG_MARK, APLOG_TRACE3, rv, r,
+                          "SSL cleanup brigade contained %"
+                          APR_OFF_T_FMT " bytes of data.", len);
+            apr_brigade_cleanup(conn->tmp_bb);
+        }
+        if ((rv != APR_SUCCESS) && !APR_STATUS_IS_EAGAIN(rv)) {
+            socket_cleanup(conn);
+        }
+    }
+    return APR_SUCCESS;
+}
+
+/* reslist constructor */
+static apr_status_t connection_constructor(void **resource, void *params,
+                                           apr_pool_t *pool)
+{
+    apr_pool_t *ctx;
+    apr_pool_t *scpool;
+    proxy_conn_rec *conn;
+    proxy_worker *worker = (proxy_worker *)params;
+
+    /*
+     * Create the subpool for each connection
+     * This keeps the memory consumption constant
+     * when disconnecting from backend.
+     */
+    apr_pool_create(&ctx, pool);
+    apr_pool_tag(ctx, "proxy_conn_pool");
+    /*
+     * Create another subpool that manages the data for the
+     * socket and the connection member of the proxy_conn_rec struct as we
+     * destroy this data more frequently than other data in the proxy_conn_rec
+     * struct like hostname and addr (at least in the case where we have
+     * keepalive connections that timed out).
+     */
+    apr_pool_create(&scpool, ctx);
+    apr_pool_tag(scpool, "proxy_conn_scpool");
+    conn = apr_pcalloc(ctx, sizeof(proxy_conn_rec));
+
+    conn->pool   = ctx;
+    conn->scpool = scpool;
+    conn->worker = worker;
+    conn->inreslist = 1;
+    *resource = conn;
+
+    return APR_SUCCESS;
+}
+
+/* reslist destructor */
+static apr_status_t connection_destructor(void *resource, void *params,
+                                          apr_pool_t *pool)
+{
+    proxy_worker *worker = params;
+
+    /* Destroy the pool only if not called from reslist_destroy */
+    if (worker->cp) {
+        proxy_conn_rec *conn = resource;
+        apr_pool_destroy(conn->pool);
+    }
+
+    return APR_SUCCESS;
+}
+
+/*
+ * WORKER related...
+ */
+
+PROXY_DECLARE(char *) ap_proxy_worker_name(apr_pool_t *p,
+                                           proxy_worker *worker)
+{
+    if (!(*worker->s->uds_path) || !p) {
+        /* just in case */
+        return worker->s->name_ex;
+    }
+    return apr_pstrcat(p, "unix:", worker->s->uds_path, "|", worker->s->name_ex, NULL);
+}
+
+PROXY_DECLARE(int) ap_proxy_worker_can_upgrade(apr_pool_t *p,
+                                               const proxy_worker *worker,
+                                               const char *upgrade,
+                                               const char *dflt)
+{
+    /* Find in worker->s->upgrade list (if any) */
+    const char *worker_upgrade = worker->s->upgrade;
+    if (*worker_upgrade) {
+        return (strcmp(worker_upgrade, "*") == 0
+                || ap_cstr_casecmp(worker_upgrade, upgrade) == 0
+                || ap_find_token(p, worker_upgrade, upgrade));
+    }
+
+    /* Compare to the provided default (if any) */
+    return (dflt && ap_cstr_casecmp(dflt, upgrade) == 0);
+}
+
+/*
+ * Taken from ap_strcmp_match() :
+ * Match = 0, NoMatch = 1, Abort = -1, Inval = -2
+ * Based loosely on sections of wildmat.c by Rich Salz
+ * Hmmm... shouldn't this really go component by component?
+ *
+ * Adds handling of the "\<any>" => "<any>" unescaping.
+ */
+static int ap_proxy_strcmp_ematch(const char *str, const char *expected)
+{
+    apr_size_t x, y;
+
+    for (x = 0, y = 0; expected[y]; ++y, ++x) {
+        if (expected[y] == '$' && apr_isdigit(expected[y + 1])) {
+            do {
+                y += 2;
+            } while (expected[y] == '$' && apr_isdigit(expected[y + 1]));
+            if (!expected[y])
+                return 0;
+            while (str[x]) {
+                int ret;
+                if ((ret = ap_proxy_strcmp_ematch(&str[x++], &expected[y])) != 1)
+                    return ret;
+            }
+            return -1;
+        }
+        else if (!str[x]) {
+            return -1;
+        }
+        else if (expected[y] == '\\' && !expected[++y]) {
+            /* NUL is an invalid char! */
+            return -2;
+        }
+        if (str[x] != expected[y])
+            return 1;
+    }
+    /* We got all the way through the worker path without a difference */
+    return 0;
+}
+
+PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker_ex(apr_pool_t *p,
+                                                     proxy_balancer *balancer,
+                                                     proxy_server_conf *conf,
+                                                     const char *url,
+                                                     unsigned int mask)
+{
+    proxy_worker *worker;
+    proxy_worker *max_worker = NULL;
+    int max_match = 0;
+    int url_length;
+    int min_match;
+    int worker_name_length;
+    const char *c;
+    char *url_copy;
+    int i;
+
+    if (!url) {
+        return NULL;
+    }
+
+    if (!(mask & AP_PROXY_WORKER_NO_UDS)) {
+        url = ap_proxy_de_socketfy(p, url);
+        if (!url) {
+            return NULL;
+        }
+    }
+
+    c = ap_strchr_c(url, ':');
+    if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0') {
+        return NULL;
+    }
+
+    url_length = strlen(url);
+    url_copy = apr_pstrmemdup(p, url, url_length);
+
+    /* Default to lookup for both _PREFIX and _MATCH workers */
+    if (!(mask & (AP_PROXY_WORKER_IS_PREFIX | AP_PROXY_WORKER_IS_MATCH))) {
+        mask |= AP_PROXY_WORKER_IS_PREFIX | AP_PROXY_WORKER_IS_MATCH;
+    }
+
+    /*
+     * We need to find the start of the path and
+     * therefore we know the length of the scheme://hostname/
+     * part to we can force-lowercase everything up to
+     * the start of the path.
+     */
+    c = ap_strchr_c(c+3, '/');
+    if (c) {
+        char *pathstart;
+        pathstart = url_copy + (c - url);
+        *pathstart = '\0';
+        ap_str_tolower(url_copy);
+        min_match = strlen(url_copy);
+        *pathstart = '/';
+    }
+    else {
+        ap_str_tolower(url_copy);
+        min_match = strlen(url_copy);
+    }
+    /*
+     * Do a "longest match" on the worker name to find the worker that
+     * fits best to the URL, but keep in mind that we must have at least
+     * a minimum matching of length min_match such that
+     * scheme://hostname[:port] matches between worker and url.
+     */
+
+    if (balancer) {
+        proxy_worker **workers = (proxy_worker **)balancer->workers->elts;
+        for (i = 0; i < balancer->workers->nelts; i++, workers++) {
+            worker = *workers;
+            if ( ((worker_name_length = strlen(worker->s->name_ex)) <= url_length)
+                && (worker_name_length >= min_match)
+                && (worker_name_length > max_match)
+                && (worker->s->is_name_matchable
+                    || ((mask & AP_PROXY_WORKER_IS_PREFIX)
+                        && strncmp(url_copy, worker->s->name_ex,
+                                   worker_name_length) == 0))
+                && (!worker->s->is_name_matchable
+                    || ((mask & AP_PROXY_WORKER_IS_MATCH)
+                        && ap_proxy_strcmp_ematch(url_copy,
+                                                  worker->s->name_ex) == 0)) ) {
+                max_worker = worker;
+                max_match = worker_name_length;
+            }
+        }
+    } else {
+        worker = (proxy_worker *)conf->workers->elts;
+        for (i = 0; i < conf->workers->nelts; i++, worker++) {
+            if ( ((worker_name_length = strlen(worker->s->name_ex)) <= url_length)
+                && (worker_name_length >= min_match)
+                && (worker_name_length > max_match)
+                && (worker->s->is_name_matchable
+                    || ((mask & AP_PROXY_WORKER_IS_PREFIX)
+                        && strncmp(url_copy, worker->s->name_ex,
+                                   worker_name_length) == 0))
+                && (!worker->s->is_name_matchable
+                    || ((mask & AP_PROXY_WORKER_IS_MATCH)
+                        && ap_proxy_strcmp_ematch(url_copy,
+                                                  worker->s->name_ex) == 0)) ) {
+                max_worker = worker;
+                max_match = worker_name_length;
+            }
+        }
+    }
+
+    return max_worker;
+}
+
+PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p,
+                                                  proxy_balancer *balancer,
+                                                  proxy_server_conf *conf,
+                                                  const char *url)
+{
+    return ap_proxy_get_worker_ex(p, balancer, conf, url, 0);
+}
+
+/*
+ * To create a worker from scratch first we define the
+ * specifics of the worker; this is all local data.
+ * We then allocate space for it if data needs to be
+ * shared. This allows for dynamic addition during
+ * config and runtime.
+ */
+PROXY_DECLARE(char *) ap_proxy_define_worker_ex(apr_pool_t *p,
+                                             proxy_worker **worker,
+                                             proxy_balancer *balancer,
+                                             proxy_server_conf *conf,
+                                             const char *url,
+                                             unsigned int mask)
+{
+    apr_status_t rv;
+    proxy_worker_shared *wshared;
+    const char *ptr = NULL, *sockpath = NULL, *pdollars = NULL;
+    apr_port_t port_of_scheme;
+    apr_uri_t uri;
+
+    /*
+     * Look to see if we are using UDS:
+     * require format: unix:/path/foo/bar.sock|http://ignored/path2/
+     * This results in talking http to the socket at /path/foo/bar.sock
+     */
+    if (!ap_cstr_casecmpn(url, "unix:", 5)
+            && (ptr = ap_strchr_c(url + 5, '|'))) {
+        rv = apr_uri_parse(p, apr_pstrmemdup(p, url, ptr - url), &uri);
+        if (rv == APR_SUCCESS) {
+            sockpath = ap_runtime_dir_relative(p, uri.path);;
+            ptr++;    /* so we get the scheme for the uds */
+        }
+        else {
+            ptr = url;
+        }
+    }
+    else {
+        ptr = url;
+    }
+
+    if (mask & AP_PROXY_WORKER_IS_MATCH) {
+        /* apr_uri_parse() will accept the '$' sign anywhere in the URL but
+         * in the :port part, and we don't want scheme://host:port$1$2/path
+         * to fail (e.g. "ProxyPassMatch ^/(a|b)(/.*)? http://host:port$2").
+         * So we trim all the $n from the :port and prepend them in uri.path
+         * afterward for apr_uri_unparse() to restore the original URL below.
+         */
+#define IS_REF(x) (x[0] == '$' && apr_isdigit(x[1]))
+        const char *pos = ap_strstr_c(ptr, "://");
+        if (pos) {
+            pos += 3;
+            while (*pos && *pos != ':' && *pos != '/') {
+                pos++;
+            }
+            if (*pos == ':') {
+                pos++;
+                while (*pos && !IS_REF(pos) && *pos != '/') {
+                    pos++;
+                }
+                if (IS_REF(pos)) {
+                    struct iovec vec[2];
+                    const char *path = pos + 2;
+                    while (*path && *path != '/') {
+                        path++;
+                    }
+                    pdollars = apr_pstrmemdup(p, pos, path - pos);
+                    vec[0].iov_base = (void *)ptr;
+                    vec[0].iov_len = pos - ptr;
+                    vec[1].iov_base = (void *)path;
+                    vec[1].iov_len = strlen(path);
+                    ptr = apr_pstrcatv(p, vec, 2, NULL);
+                }
+            }
+        }
+#undef IS_REF
+    }
+
+    /* Normalize the url (worker name) */
+    rv = apr_uri_parse(p, ptr, &uri);
+    if (rv != APR_SUCCESS) {
+        return apr_pstrcat(p, "Unable to parse URL: ", url, NULL);
+    }
+    if (!uri.scheme) {
+        return apr_pstrcat(p, "URL must be absolute!: ", url, NULL);
+    }
+    if (!uri.hostname) {
+        if (sockpath) {
+            /* allow for unix:/path|http: */
+            uri.hostname = "localhost";
+        }
+        else {
+            return apr_pstrcat(p, "URL must be absolute!: ", url, NULL);
+        }
+    }
+    else {
+        ap_str_tolower(uri.hostname);
+    }
+    ap_str_tolower(uri.scheme);
+    port_of_scheme = ap_proxy_port_of_scheme(uri.scheme);
+    if (uri.port && uri.port == port_of_scheme) {
+        uri.port = 0;
+    }
+    if (pdollars) {
+        /* Restore/prepend pdollars into the path. */
+        uri.path = apr_pstrcat(p, pdollars, uri.path, NULL);
+    }
+    ptr = apr_uri_unparse(p, &uri, APR_URI_UNP_REVEALPASSWORD);
+
+    /*
+     * Workers can be associated w/ balancers or on their
+     * own; ie: the generic reverse-proxy or a worker
+     * in a simple ProxyPass statement. eg:
+     *
+     *      ProxyPass / http://www.example.com
+     *
+     * in which case the worker goes in the conf slot.
+     */
+    if (balancer) {
+        proxy_worker **runtime;
+        /* recall that we get a ptr to the ptr here */
+        runtime = apr_array_push(balancer->workers);
+        *worker = *runtime = apr_palloc(p, sizeof(proxy_worker));   /* right to left baby */
+        /* we've updated the list of workers associated with
+         * this balancer *locally* */
+        balancer->wupdated = apr_time_now();
+    } else if (conf) {
+        *worker = apr_array_push(conf->workers);
+    } else {
+        /* we need to allocate space here */
+        *worker = apr_palloc(p, sizeof(proxy_worker));
+    }
+    memset(*worker, 0, sizeof(proxy_worker));
+    
+    /* right here we just want to tuck away the worker info.
+     * if called during config, we don't have shm setup yet,
+     * so just note the info for later. */
+    if (mask & AP_PROXY_WORKER_IS_MALLOCED)
+        wshared = ap_malloc(sizeof(proxy_worker_shared));  /* will be freed ap_proxy_share_worker */
+    else
+        wshared = apr_palloc(p, sizeof(proxy_worker_shared));
+    memset(wshared, 0, sizeof(proxy_worker_shared));
+
+    if (PROXY_STRNCPY(wshared->name_ex, ptr) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(10366)
+        "Alert! worker name (%s) too long; truncated to: %s", ptr, wshared->name_ex);
+    }
+    if (PROXY_STRNCPY(wshared->name, ptr) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(010118)
+        "worker name (%s) too long; truncated for legacy modules that do not use "
+        "proxy_worker_shared->name_ex: %s", ptr, wshared->name);
+    }
+    if (PROXY_STRNCPY(wshared->scheme, uri.scheme) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(010117)
+        "Alert! worker scheme (%s) too long; truncated to: %s", uri.scheme, wshared->scheme);
+    }
+    if (PROXY_STRNCPY(wshared->hostname_ex, uri.hostname) != APR_SUCCESS) {
+        return apr_psprintf(p, "worker hostname (%s) too long", uri.hostname);
+    }
+    if (PROXY_STRNCPY(wshared->hostname, uri.hostname) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(010118)
+        "worker hostname (%s) too long; truncated for legacy modules that do not use "
+        "proxy_worker_shared->hostname_ex: %s", uri.hostname, wshared->hostname);
+    }
+    wshared->port = (uri.port) ? uri.port : port_of_scheme;
+    wshared->flush_packets = flush_off;
+    wshared->flush_wait = PROXY_FLUSH_WAIT;
+    wshared->is_address_reusable = 1;
+    wshared->lbfactor = 100;
+    wshared->passes = 1;
+    wshared->fails = 1;
+    wshared->interval = apr_time_from_sec(HCHECK_WATHCHDOG_DEFAULT_INTERVAL);
+    wshared->smax = -1;
+    wshared->hash.def = ap_proxy_hashfunc(wshared->name_ex, PROXY_HASHFUNC_DEFAULT);
+    wshared->hash.fnv = ap_proxy_hashfunc(wshared->name_ex, PROXY_HASHFUNC_FNV);
+    wshared->was_malloced = (mask & AP_PROXY_WORKER_IS_MALLOCED) != 0;
+    wshared->is_name_matchable = 0;
+    if (sockpath) {
+        if (PROXY_STRNCPY(wshared->uds_path, sockpath) != APR_SUCCESS) {
+            return apr_psprintf(p, "worker uds path (%s) too long", sockpath);
+        }
+
+    }
+    else {
+        *wshared->uds_path = '\0';
+    }
+    if (!balancer) {
+        wshared->status |= PROXY_WORKER_IGNORE_ERRORS;
+    }
+
+    (*worker)->hash = wshared->hash;
+    (*worker)->context = NULL;
+    (*worker)->cp = NULL;
+    (*worker)->balancer = balancer;
+    (*worker)->s = wshared;
+
+    if (mask & AP_PROXY_WORKER_IS_MATCH) {
+        (*worker)->s->is_name_matchable = 1;
+        if (ap_strchr_c((*worker)->s->name_ex, '$')) {
+            /* Before AP_PROXY_WORKER_IS_MATCH (< 2.4.47), a regex worker
+             * with dollar substitution was never matched against the actual
+             * URL thus the request fell through the generic worker. To avoid
+             * dns and connection reuse compat issues, let's disable connection
+             * reuse by default, it can still be overwritten by an explicit
+             * enablereuse=on.
+             */
+            (*worker)->s->disablereuse = 1;
+        }
+    }
+
+    return NULL;
+}
+
+PROXY_DECLARE(char *) ap_proxy_define_worker(apr_pool_t *p,
+                                             proxy_worker **worker,
+                                             proxy_balancer *balancer,
+                                             proxy_server_conf *conf,
+                                             const char *url,
+                                             int do_malloc)
+{
+    return ap_proxy_define_worker_ex(p, worker, balancer, conf, url,
+                                     AP_PROXY_WORKER_IS_PREFIX |
+                                     (do_malloc ? AP_PROXY_WORKER_IS_MALLOCED
+                                                : 0));
+}
+
+/* DEPRECATED */
+PROXY_DECLARE(char *) ap_proxy_define_match_worker(apr_pool_t *p,
+                                             proxy_worker **worker,
+                                             proxy_balancer *balancer,
+                                             proxy_server_conf *conf,
+                                             const char *url,
+                                             int do_malloc)
+{
+    return ap_proxy_define_worker_ex(p, worker, balancer, conf, url,
+                                     AP_PROXY_WORKER_IS_MATCH |
+                                     (do_malloc ? AP_PROXY_WORKER_IS_MALLOCED
+                                                : 0));
+}
+
+/*
+ * Create an already defined worker and free up memory
+ */
+PROXY_DECLARE(apr_status_t) ap_proxy_share_worker(proxy_worker *worker, proxy_worker_shared *shm,
+                                                  int i)
+{
+    char *action = "copying";
+    if (!shm || !worker->s)
+        return APR_EINVAL;
+
+    if ((worker->s->hash.def != shm->hash.def) ||
+        (worker->s->hash.fnv != shm->hash.fnv)) {
+        memcpy(shm, worker->s, sizeof(proxy_worker_shared));
+        if (worker->s->was_malloced)
+            free(worker->s); /* was malloced in ap_proxy_define_worker */
+    } else {
+        action = "re-using";
+    }
+    worker->s = shm;
+    worker->s->index = i;
+
+    if (APLOGdebug(ap_server_conf)) {
+        apr_pool_t *pool;
+        apr_pool_create(&pool, ap_server_conf->process->pool);
+        apr_pool_tag(pool, "proxy_worker_name");
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02338)
+                     "%s shm[%d] (0x%pp) for worker: %s", action, i, (void *)shm,
+                     ap_proxy_worker_name(pool, worker));
+        if (pool) {
+            apr_pool_destroy(pool);
+        }
+    }
+    return APR_SUCCESS;
+}
+
+PROXY_DECLARE(apr_status_t) ap_proxy_initialize_worker(proxy_worker *worker, server_rec *s, apr_pool_t *p)
+{
+    APR_OPTIONAL_FN_TYPE(http2_get_num_workers) *get_h2_num_workers;
+    apr_status_t rv = APR_SUCCESS;
+    int max_threads, minw, maxw;
+
+    if (worker->s->status & PROXY_WORKER_INITIALIZED) {
+        /* The worker is already initialized */
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00924)
+                     "worker %s shared already initialized",
+                     ap_proxy_worker_name(p, worker));
+    }
+    else {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00925)
+                     "initializing worker %s shared",
+                     ap_proxy_worker_name(p, worker));
+        /* Set default parameters */
+        if (!worker->s->retry_set) {
+            worker->s->retry = apr_time_from_sec(PROXY_WORKER_DEFAULT_RETRY);
+        }
+        /* By default address is reusable unless DisableReuse is set */
+        if (worker->s->disablereuse) {
+            worker->s->is_address_reusable = 0;
+        }
+        else {
+            worker->s->is_address_reusable = 1;
+        }
+
+        /*
+         * When mod_http2 is loaded we might have more threads since it has
+         * its own pool of processing threads.
+         */
+        ap_mpm_query(AP_MPMQ_MAX_THREADS, &max_threads);
+        get_h2_num_workers = APR_RETRIEVE_OPTIONAL_FN(http2_get_num_workers);
+        if (get_h2_num_workers) {
+            get_h2_num_workers(s, &minw, &maxw);
+            /* So now the max is:
+             *   max_threads-1 threads for HTTP/1 each requiring one connection
+             *   + one thread for HTTP/2 requiring maxw connections
+             */
+            max_threads = max_threads - 1 + maxw;
+        }
+        if (max_threads > 1) {
+            /* Default hmax is max_threads to scale with the load and never
+             * wait for an idle connection to proceed.
+             */
+            if (worker->s->hmax == 0) {
+                worker->s->hmax = max_threads;
+            }
+            if (worker->s->smax == -1 || worker->s->smax > worker->s->hmax) {
+                worker->s->smax = worker->s->hmax;
+            }
+            /* Set min to be lower than smax */
+            if (worker->s->min > worker->s->smax) {
+                worker->s->min = worker->s->smax;
+            }
+        }
+        else {
+            /* This will suppress the apr_reslist creation */
+            worker->s->min = worker->s->smax = worker->s->hmax = 0;
+        }
+    }
+
+    /* What if local is init'ed and shm isn't?? Even possible? */
+    if (worker->local_status & PROXY_WORKER_INITIALIZED) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00926)
+                     "worker %s local already initialized",
+                     ap_proxy_worker_name(p, worker));
+    }
+    else {
+        apr_global_mutex_lock(proxy_mutex);
+        /* Check again after we got the lock if we are still uninitialized */
+        if (!(AP_VOLATILIZE_T(unsigned int, worker->local_status) & PROXY_WORKER_INITIALIZED)) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00927)
+                         "initializing worker %s local",
+                         ap_proxy_worker_name(p, worker));
+            /* Now init local worker data */
+#if APR_HAS_THREADS
+            if (worker->tmutex == NULL) {
+                rv = apr_thread_mutex_create(&(worker->tmutex), APR_THREAD_MUTEX_DEFAULT, p);
+                if (rv != APR_SUCCESS) {
+                    ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00928)
+                                 "can not create worker thread mutex");
+                    apr_global_mutex_unlock(proxy_mutex);
+                    return rv;
+                }
+            }
+#endif
+            if (worker->cp == NULL)
+                init_conn_pool(p, worker);
+            if (worker->cp == NULL) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00929)
+                             "can not create connection pool");
+                apr_global_mutex_unlock(proxy_mutex);
+                return APR_EGENERAL;
+            }
+
+            if (worker->s->hmax) {
+                rv = apr_reslist_create(&(worker->cp->res),
+                                        worker->s->min, worker->s->smax,
+                                        worker->s->hmax, worker->s->ttl,
+                                        connection_constructor, connection_destructor,
+                                        worker, worker->cp->pool);
+
+                ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00930)
+                    "initialized pool in child %" APR_PID_T_FMT " for (%s:%d) min=%d max=%d smax=%d",
+                     getpid(), worker->s->hostname_ex, (int)worker->s->port,
+                     worker->s->min, worker->s->hmax, worker->s->smax);
+
+                /* Set the acquire timeout */
+                if (rv == APR_SUCCESS && worker->s->acquire_set) {
+                    apr_reslist_timeout_set(worker->cp->res, worker->s->acquire);
+                }
+
+            }
+            else {
+                void *conn;
+
+                rv = connection_constructor(&conn, worker, worker->cp->pool);
+                worker->cp->conn = conn;
+
+                ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, s, APLOGNO(00931)
+                     "initialized single connection worker in child %" APR_PID_T_FMT " for (%s:%d)",
+                     getpid(), worker->s->hostname_ex,
+                     (int)worker->s->port);
+            }
+            if (rv == APR_SUCCESS) {
+                worker->local_status |= (PROXY_WORKER_INITIALIZED);
+            }
+        }
+        apr_global_mutex_unlock(proxy_mutex);
+
+    }
+    if (rv == APR_SUCCESS) {
+        worker->s->status |= (PROXY_WORKER_INITIALIZED);
+    }
+    return rv;
+}
+
+static int ap_proxy_retry_worker(const char *proxy_function, proxy_worker *worker,
+        server_rec *s)
+{
+    if (worker->s->status & PROXY_WORKER_IN_ERROR) {
+        if (PROXY_WORKER_IS(worker, PROXY_WORKER_STOPPED)) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(3305)
+                         "%s: Won't retry worker (%s:%d): stopped",
+                         proxy_function, worker->s->hostname_ex,
+                         (int)worker->s->port);
+            return DECLINED;
+        }
+        if ((worker->s->status & PROXY_WORKER_IGNORE_ERRORS)
+            || apr_time_now() > worker->s->error_time + worker->s->retry) {
+            ++worker->s->retries;
+            worker->s->status &= ~PROXY_WORKER_IN_ERROR;
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00932)
+                         "%s: worker for (%s:%d) has been marked for retry",
+                         proxy_function, worker->s->hostname_ex,
+                         (int)worker->s->port);
+            return OK;
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00933)
+                         "%s: too soon to retry worker for (%s:%d)",
+                         proxy_function, worker->s->hostname_ex,
+                         (int)worker->s->port);
+            return DECLINED;
+        }
+    }
+    else {
+        return OK;
+    }
+}
+
+/*
+ * In the case of the reverse proxy, we need to see if we
+ * were passed a UDS url (eg: from mod_proxy) and adjust uds_path
+ * as required.  
+ */
+static int fix_uds_filename(request_rec *r, char **url) 
+{
+    char *uds_url = r->filename + 6, *origin_url;
+
+    if (!strncmp(r->filename, "proxy:", 6) &&
+            !ap_cstr_casecmpn(uds_url, "unix:", 5) &&
+            (origin_url = ap_strchr(uds_url + 5, '|'))) {
+        char *uds_path = NULL;
+        apr_size_t url_len;
+        apr_uri_t urisock;
+        apr_status_t rv;
+
+        *origin_url = '\0';
+        rv = apr_uri_parse(r->pool, uds_url, &urisock);
+        *origin_url++ = '|';
+
+        if (rv == APR_SUCCESS && urisock.path && (!urisock.hostname
+                                                  || !urisock.hostname[0])) {
+            uds_path = ap_runtime_dir_relative(r->pool, urisock.path);
+        }
+        if (!uds_path) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10292)
+                    "Invalid proxy UDS filename (%s)", r->filename);
+            return 0;
+        }
+        apr_table_setn(r->notes, "uds_path", uds_path);
+
+        /* Remove the UDS path from *url and r->filename */
+        url_len = strlen(origin_url);
+        *url = apr_pstrmemdup(r->pool, origin_url, url_len);
+        memcpy(uds_url, *url, url_len + 1);
+
+        ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                "*: rewrite of url due to UDS(%s): %s (%s)",
+                uds_path, *url, r->filename);
+    }
+    return 1;
+}
+
+PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
+                                        proxy_balancer **balancer,
+                                        request_rec *r,
+                                        proxy_server_conf *conf, char **url)
+{
+    int access_status;
+
+    access_status = proxy_run_pre_request(worker, balancer, r, conf, url);
+    if (access_status == DECLINED && *balancer == NULL) {
+        const int forward = (r->proxyreq == PROXYREQ_PROXY);
+        *worker = ap_proxy_get_worker_ex(r->pool, NULL, conf, *url,
+                                         forward ? AP_PROXY_WORKER_NO_UDS : 0);
+        if (*worker) {
+            ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                          "%s: found worker %s for %s",
+                          (*worker)->s->scheme, (*worker)->s->name_ex, *url);
+            if (!forward && !fix_uds_filename(r, url)) {
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+            access_status = OK;
+        }
+        else if (forward) {
+            if (conf->forward) {
+                ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                              "*: found forward proxy worker for %s", *url);
+                *worker = conf->forward;
+                access_status = OK;
+                /*
+                 * The forward worker does not keep connections alive, so
+                 * ensure that mod_proxy_http does the correct thing
+                 * regarding the Connection header in the request.
+                 */
+                apr_table_setn(r->subprocess_env, "proxy-nokeepalive", "1");
+            }
+        }
+        else if (r->proxyreq == PROXYREQ_REVERSE) {
+            if (conf->reverse) {
+                ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                              "*: using default reverse proxy worker for %s "
+                              "(no keepalive)", *url);
+                *worker = conf->reverse;
+                access_status = OK;
+                /*
+                 * The reverse worker does not keep connections alive, so
+                 * ensure that mod_proxy_http does the correct thing
+                 * regarding the Connection header in the request.
+                 */
+                apr_table_setn(r->subprocess_env, "proxy-nokeepalive", "1");
+                if (!fix_uds_filename(r, url)) {
+                    return HTTP_INTERNAL_SERVER_ERROR;
+                }
+            }
+        }
+    }
+    else if (access_status == DECLINED && *balancer != NULL) {
+        /* All the workers are busy */
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00934)
+                      "all workers are busy.  Unable to serve %s", *url);
+        access_status = HTTP_SERVICE_UNAVAILABLE;
+    }
+    return access_status;
+}
+
+PROXY_DECLARE(int) ap_proxy_post_request(proxy_worker *worker,
+                                         proxy_balancer *balancer,
+                                         request_rec *r,
+                                         proxy_server_conf *conf)
+{
+    int access_status = OK;
+    if (balancer) {
+        access_status = proxy_run_post_request(worker, balancer, r, conf);
+        if (access_status == DECLINED) {
+            access_status = OK; /* no post_request handler available */
+            /* TODO: recycle direct worker */
+        }
+    }
+
+    return access_status;
+}
+
+/* DEPRECATED */
+PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **newsock,
+                                               const char *proxy_function,
+                                               apr_sockaddr_t *backend_addr,
+                                               const char *backend_name,
+                                               proxy_server_conf *conf,
+                                               request_rec *r)
+{
+    apr_status_t rv;
+    int connected = 0;
+    int loglevel;
+
+    while (backend_addr && !connected) {
+        if ((rv = apr_socket_create(newsock, backend_addr->family,
+                                    SOCK_STREAM, 0, r->pool)) != APR_SUCCESS) {
+            loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
+            ap_log_rerror(APLOG_MARK, loglevel, rv, r, APLOGNO(00935)
+                          "%s: error creating fam %d socket for target %s",
+                          proxy_function, backend_addr->family, backend_name);
+            /*
+             * this could be an IPv6 address from the DNS but the
+             * local machine won't give us an IPv6 socket; hopefully the
+             * DNS returned an additional address to try
+             */
+            backend_addr = backend_addr->next;
+            continue;
+        }
+
+        if (conf->recv_buffer_size > 0 &&
+            (rv = apr_socket_opt_set(*newsock, APR_SO_RCVBUF,
+                                     conf->recv_buffer_size))) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00936)
+                          "apr_socket_opt_set(SO_RCVBUF): Failed to set "
+                          "ProxyReceiveBufferSize, using default");
+        }
+
+        rv = apr_socket_opt_set(*newsock, APR_TCP_NODELAY, 1);
+        if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00937)
+                          "apr_socket_opt_set(APR_TCP_NODELAY): "
+                          "Failed to set");
+        }
+
+        /* Set a timeout on the socket */
+        if (conf->timeout_set) {
+            apr_socket_timeout_set(*newsock, conf->timeout);
+        }
+        else {
+            apr_socket_timeout_set(*newsock, r->server->timeout);
+        }
+
+        ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                      "%s: fam %d socket created to connect to %s",
+                      proxy_function, backend_addr->family, backend_name);
+
+        if (conf->source_address) {
+            apr_sockaddr_t *local_addr;
+            /* Make a copy since apr_socket_bind() could change
+             * conf->source_address, which we don't want.
+             */
+            local_addr = apr_pmemdup(r->pool, conf->source_address,
+                                     sizeof(apr_sockaddr_t));
+            local_addr->pool = r->pool;
+            rv = apr_socket_bind(*newsock, local_addr);
+            if (rv != APR_SUCCESS) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00938)
+                              "%s: failed to bind socket to local address",
+                              proxy_function);
+            }
+        }
+
+        /* make the connection out of the socket */
+        rv = apr_socket_connect(*newsock, backend_addr);
+
+        /* if an error occurred, loop round and try again */
+        if (rv != APR_SUCCESS) {
+            apr_socket_close(*newsock);
+            loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
+            ap_log_rerror(APLOG_MARK, loglevel, rv, r, APLOGNO(00939)
+                          "%s: attempt to connect to %pI (%s) failed",
+                          proxy_function, backend_addr, backend_name);
+            backend_addr = backend_addr->next;
+            continue;
+        }
+        connected = 1;
+    }
+    return connected ? 0 : 1;
+}
+
+PROXY_DECLARE(int) ap_proxy_acquire_connection(const char *proxy_function,
+                                               proxy_conn_rec **conn,
+                                               proxy_worker *worker,
+                                               server_rec *s)
+{
+    apr_status_t rv;
+
+    if (!PROXY_WORKER_IS_USABLE(worker)) {
+        /* Retry the worker */
+        ap_proxy_retry_worker(proxy_function, worker, s);
+
+        if (!PROXY_WORKER_IS_USABLE(worker)) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00940)
+                         "%s: disabled connection for (%s:%d)",
+                         proxy_function, worker->s->hostname_ex,
+                         (int)worker->s->port);
+            return HTTP_SERVICE_UNAVAILABLE;
+        }
+    }
+
+    if (worker->s->hmax && worker->cp->res) {
+        rv = apr_reslist_acquire(worker->cp->res, (void **)conn);
+    }
+    else {
+        /* create the new connection if the previous was destroyed */
+        if (!worker->cp->conn) {
+            rv = connection_constructor((void **)conn, worker, worker->cp->pool);
+        }
+        else {
+            *conn = worker->cp->conn;
+            worker->cp->conn = NULL;
+            rv = APR_SUCCESS;
+        }
+    }
+
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00941)
+                     "%s: failed to acquire connection for (%s:%d)",
+                     proxy_function, worker->s->hostname_ex,
+                     (int)worker->s->port);
+        return HTTP_SERVICE_UNAVAILABLE;
+    }
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00942)
+                 "%s: has acquired connection for (%s:%d)",
+                 proxy_function, worker->s->hostname_ex,
+                 (int)worker->s->port);
+
+    (*conn)->worker = worker;
+    (*conn)->close  = 0;
+    (*conn)->inreslist = 0;
+
+    return OK;
+}
+
+PROXY_DECLARE(int) ap_proxy_release_connection(const char *proxy_function,
+                                               proxy_conn_rec *conn,
+                                               server_rec *s)
+{
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00943)
+                "%s: has released connection for (%s:%d)",
+                proxy_function, conn->worker->s->hostname_ex,
+                (int)conn->worker->s->port);
+    connection_cleanup(conn);
+
+    return OK;
+}
+
+PROXY_DECLARE(int)
+ap_proxy_determine_connection(apr_pool_t *p, request_rec *r,
+                              proxy_server_conf *conf,
+                              proxy_worker *worker,
+                              proxy_conn_rec *conn,
+                              apr_uri_t *uri,
+                              char **url,
+                              const char *proxyname,
+                              apr_port_t proxyport,
+                              char *server_portstr,
+                              int server_portstr_size)
+{
+    int server_port;
+    apr_status_t err = APR_SUCCESS;
+#if APR_HAS_THREADS
+    apr_status_t uerr = APR_SUCCESS;
+#endif
+    const char *uds_path;
+
+    /*
+     * Break up the URL to determine the host to connect to
+     */
+
+    /* we break the URL into host, port, uri */
+    if (APR_SUCCESS != apr_uri_parse(p, *url, uri)) {
+        return ap_proxyerror(r, HTTP_BAD_REQUEST,
+                             apr_pstrcat(p,"URI cannot be parsed: ", *url,
+                                         NULL));
+    }
+    if (!uri->port) {
+        uri->port = ap_proxy_port_of_scheme(uri->scheme);
+    }
+
+    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00944)
+                 "connecting %s to %s:%d", *url, uri->hostname, uri->port);
+
+    /*
+     * allocate these out of the specified connection pool
+     * The scheme handler decides if this is permanent or
+     * short living pool.
+     */
+    /* Unless we are connecting the backend via a (forward Proxy)Remote, we
+     * have to use the original form of the URI (non absolute), but this is
+     * also the case via a remote proxy using the CONNECT method since the
+     * original request (and URI) is to be embedded in the body.
+     */
+    if (!proxyname || conn->is_ssl) {
+        *url = apr_pstrcat(p, uri->path, uri->query ? "?" : "",
+                           uri->query ? uri->query : "",
+                           uri->fragment ? "#" : "",
+                           uri->fragment ? uri->fragment : "", NULL);
+    }
+    /*
+     * Figure out if our passed in proxy_conn_rec has a usable
+     * address cached.
+     *
+     * TODO: Handle this much better... 
+     *
+     * XXX: If generic workers are ever address-reusable, we need 
+     *      to check host and port on the conn and be careful about
+     *      spilling the cached addr from the worker.
+     */
+    uds_path = (*worker->s->uds_path ? worker->s->uds_path : apr_table_get(r->notes, "uds_path"));
+    if (uds_path) {
+        if (conn->uds_path == NULL) {
+            /* use (*conn)->pool instead of worker->cp->pool to match lifetime */
+            conn->uds_path = apr_pstrdup(conn->pool, uds_path);
+        }
+        if (conn->uds_path) {
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02545)
+                         "%s: has determined UDS as %s",
+                         uri->scheme, conn->uds_path);
+        }
+        else {
+            /* should never happen */
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02546)
+                         "%s: cannot determine UDS (%s)",
+                         uri->scheme, uds_path);
+
+        }
+        /*
+         * In UDS cases, some structs are NULL. Protect from de-refs
+         * and provide info for logging at the same time.
+         */
+        if (!conn->addr) {
+            apr_sockaddr_t *sa;
+            apr_sockaddr_info_get(&sa, NULL, APR_UNSPEC, 0, 0, conn->pool);
+            conn->addr = sa;
+        }
+        conn->hostname = "httpd-UDS";
+        conn->port = 0;
+    }
+    else {
+        int will_reuse = worker->s->is_address_reusable && !worker->s->disablereuse;
+        if (!conn->hostname || !will_reuse) {
+            if (proxyname) {
+                conn->hostname = apr_pstrdup(conn->pool, proxyname);
+                conn->port = proxyport;
+                /*
+                 * If we have a forward proxy and the protocol is HTTPS,
+                 * then we need to prepend a HTTP CONNECT request before
+                 * sending our actual HTTPS requests.
+                 * Save our real backend data for using it later during HTTP CONNECT.
+                 */
+                if (conn->is_ssl) {
+                    const char *proxy_auth;
+
+                    forward_info *forward = apr_pcalloc(conn->pool, sizeof(forward_info));
+                    conn->forward = forward;
+                    forward->use_http_connect = 1;
+                    forward->target_host = apr_pstrdup(conn->pool, uri->hostname);
+                    forward->target_port = uri->port;
+                    /* Do we want to pass Proxy-Authorization along?
+                     * If we haven't used it, then YES
+                     * If we have used it then MAYBE: RFC2616 says we MAY propagate it.
+                     * So let's make it configurable by env.
+                     * The logic here is the same used in mod_proxy_http.
+                     */
+                    proxy_auth = apr_table_get(r->headers_in, "Proxy-Authorization");
+                    if (proxy_auth != NULL &&
+                        proxy_auth[0] != '\0' &&
+                        r->user == NULL && /* we haven't yet authenticated */
+                        apr_table_get(r->subprocess_env, "Proxy-Chain-Auth")) {
+                        forward->proxy_auth = apr_pstrdup(conn->pool, proxy_auth);
+                    }
+                }
+            }
+            else {
+                conn->hostname = apr_pstrdup(conn->pool, uri->hostname);
+                conn->port = uri->port;
+            }
+            if (!will_reuse) {
+                /*
+                 * Only do a lookup if we should not reuse the backend address.
+                 * Otherwise we will look it up once for the worker.
+                 */
+                err = apr_sockaddr_info_get(&(conn->addr),
+                                            conn->hostname, APR_UNSPEC,
+                                            conn->port, 0,
+                                            conn->pool);
+            }
+            socket_cleanup(conn);
+            conn->close = 0;
+        }
+        if (will_reuse) {
+            /*
+             * Looking up the backend address for the worker only makes sense if
+             * we can reuse the address.
+             */
+            if (!worker->cp->addr) {
+#if APR_HAS_THREADS
+                if ((err = PROXY_THREAD_LOCK(worker)) != APR_SUCCESS) {
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, err, r, APLOGNO(00945) "lock");
+                    return HTTP_INTERNAL_SERVER_ERROR;
+                }
+#endif
+
+                /*
+                 * Recheck addr after we got the lock. This may have changed
+                 * while waiting for the lock.
+                 */
+                if (!AP_VOLATILIZE_T(apr_sockaddr_t *, worker->cp->addr)) {
+
+                    apr_sockaddr_t *addr;
+
+                    /*
+                     * Worker can have the single constant backend address.
+                     * The single DNS lookup is used once per worker.
+                     * If dynamic change is needed then set the addr to NULL
+                     * inside dynamic config to force the lookup.
+                     */
+                    err = apr_sockaddr_info_get(&addr,
+                                                conn->hostname, APR_UNSPEC,
+                                                conn->port, 0,
+                                                worker->cp->dns_pool);
+                    worker->cp->addr = addr;
+                }
+                conn->addr = worker->cp->addr;
+#if APR_HAS_THREADS
+                if ((uerr = PROXY_THREAD_UNLOCK(worker)) != APR_SUCCESS) {
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, uerr, r, APLOGNO(00946) "unlock");
+                }
+#endif
+            }
+            else {
+                conn->addr = worker->cp->addr;
+            }
+        }
+    }
+    /* Close a possible existing socket if we are told to do so */
+    if (conn->close) {
+        socket_cleanup(conn);
+        conn->close = 0;
+    }
+
+    if (err != APR_SUCCESS) {
+        return ap_proxyerror(r, HTTP_BAD_GATEWAY,
+                             apr_pstrcat(p, "DNS lookup failure for: ",
+                                         conn->hostname, NULL));
+    }
+
+    /* Get the server port for the Via headers */
+    server_port = ap_get_server_port(r);
+    AP_DEBUG_ASSERT(server_portstr_size > 0);
+    if (ap_is_default_port(server_port, r)) {
+        server_portstr[0] = '\0';
+    }
+    else {
+        apr_snprintf(server_portstr, server_portstr_size, ":%d",
+                     server_port);
+    }
+
+    /* check if ProxyBlock directive on this host */
+    if (OK != ap_proxy_checkproxyblock2(r, conf, uri->hostname, 
+                                       proxyname ? NULL : conn->addr)) {
+        return ap_proxyerror(r, HTTP_FORBIDDEN,
+                             "Connect to remote machine blocked");
+    }
+    /*
+     * When SSL is configured, determine the hostname (SNI) for the request
+     * and save it in conn->ssl_hostname. Close any reused connection whose
+     * SNI differs.
+     */
+    if (conn->is_ssl) {
+        proxy_dir_conf *dconf;
+        const char *ssl_hostname;
+        /*
+         * In the case of ProxyPreserveHost on use the hostname of
+         * the request if present otherwise use the one from the
+         * backend request URI.
+         */
+        dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
+        if (dconf->preserve_host) {
+            ssl_hostname = r->hostname;
+        }
+        else if (conn->forward
+                 && ((forward_info *)(conn->forward))->use_http_connect) {
+            ssl_hostname = ((forward_info *)conn->forward)->target_host;
+        }
+        else {
+            ssl_hostname = conn->hostname;
+        }
+        /*
+         * Close if a SNI is in use but this request requires no or
+         * a different one, or no SNI is in use but one is required.
+         */
+        if ((conn->ssl_hostname && (!ssl_hostname ||
+                                    strcasecmp(conn->ssl_hostname,
+                                               ssl_hostname) != 0)) ||
+                (!conn->ssl_hostname && ssl_hostname && conn->sock)) {
+            socket_cleanup(conn);
+        }
+        if (conn->ssl_hostname == NULL) {
+            conn->ssl_hostname = apr_pstrdup(conn->scpool, ssl_hostname);
+        }
+    }
+    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00947)
+                 "connected %s to %s:%d", *url, conn->hostname, conn->port);
+    return OK;
+}
+
+#define USE_ALTERNATE_IS_CONNECTED 1
+
+#if !defined(APR_MSG_PEEK) && defined(MSG_PEEK)
+#define APR_MSG_PEEK MSG_PEEK
+#endif
+
+#if USE_ALTERNATE_IS_CONNECTED && defined(APR_MSG_PEEK)
+PROXY_DECLARE(int) ap_proxy_is_socket_connected(apr_socket_t *socket)
+{
+    apr_pollfd_t pfds[1];
+    apr_status_t status;
+    apr_int32_t  nfds;
+
+    pfds[0].reqevents = APR_POLLIN;
+    pfds[0].desc_type = APR_POLL_SOCKET;
+    pfds[0].desc.s = socket;
+
+    do {
+        status = apr_poll(&pfds[0], 1, &nfds, 0);
+    } while (APR_STATUS_IS_EINTR(status));
+
+    if (status == APR_SUCCESS && nfds == 1 &&
+        pfds[0].rtnevents == APR_POLLIN) {
+        apr_sockaddr_t unused;
+        apr_size_t len = 1;
+        char buf[1];
+        /* The socket might be closed in which case
+         * the poll will return POLLIN.
+         * If there is no data available the socket
+         * is closed.
+         */
+        status = apr_socket_recvfrom(&unused, socket, APR_MSG_PEEK,
+                                     &buf[0], &len);
+        if (status == APR_SUCCESS && len)
+            return 1;
+        else
+            return 0;
+    }
+    else if (APR_STATUS_IS_EAGAIN(status) || APR_STATUS_IS_TIMEUP(status)) {
+        return 1;
+    }
+    return 0;
+
+}
+#else
+PROXY_DECLARE(int) ap_proxy_is_socket_connected(apr_socket_t *sock)
+
+{
+    apr_size_t buffer_len = 1;
+    char test_buffer[1];
+    apr_status_t socket_status;
+    apr_interval_time_t current_timeout;
+
+    /* save timeout */
+    apr_socket_timeout_get(sock, &current_timeout);
+    /* set no timeout */
+    apr_socket_timeout_set(sock, 0);
+    socket_status = apr_socket_recv(sock, test_buffer, &buffer_len);
+    /* put back old timeout */
+    apr_socket_timeout_set(sock, current_timeout);
+    if (APR_STATUS_IS_EOF(socket_status)
+        || APR_STATUS_IS_ECONNRESET(socket_status)) {
+        return 0;
+    }
+    else {
+        return 1;
+    }
+}
+#endif /* USE_ALTERNATE_IS_CONNECTED */
+
+
+/*
+ * Send a HTTP CONNECT request to a forward proxy.
+ * The proxy is given by "backend", the target server
+ * is contained in the "forward" member of "backend".
+ */
+static apr_status_t send_http_connect(proxy_conn_rec *backend,
+                                      server_rec *s)
+{
+    int status;
+    apr_size_t nbytes;
+    apr_size_t left;
+    int complete = 0;
+    char buffer[HUGE_STRING_LEN];
+    char drain_buffer[HUGE_STRING_LEN];
+    forward_info *forward = (forward_info *)backend->forward;
+    int len = 0;
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00948)
+                 "CONNECT: sending the CONNECT request for %s:%d "
+                 "to the remote proxy %pI (%s)",
+                 forward->target_host, forward->target_port,
+                 backend->addr, backend->hostname);
+    /* Create the CONNECT request */
+    nbytes = apr_snprintf(buffer, sizeof(buffer),
+                          "CONNECT %s:%d HTTP/1.0" CRLF,
+                          forward->target_host, forward->target_port);
+    /* Add proxy authorization from the initial request if necessary */
+    if (forward->proxy_auth != NULL) {
+        nbytes += apr_snprintf(buffer + nbytes, sizeof(buffer) - nbytes,
+                               "Proxy-Authorization: %s" CRLF,
+                               forward->proxy_auth);
+    }
+    /* Set a reasonable agent and send everything */
+    nbytes += apr_snprintf(buffer + nbytes, sizeof(buffer) - nbytes,
+                           "Proxy-agent: %s" CRLF CRLF,
+                           ap_get_server_banner());
+    ap_xlate_proto_to_ascii(buffer, nbytes);
+    apr_socket_send(backend->sock, buffer, &nbytes);
+
+    /* Receive the whole CONNECT response */
+    left = sizeof(buffer) - 1;
+    /* Read until we find the end of the headers or run out of buffer */
+    do {
+        nbytes = left;
+        status = apr_socket_recv(backend->sock, buffer + len, &nbytes);
+        len += nbytes;
+        left -= nbytes;
+        buffer[len] = '\0';
+        if (strstr(buffer + len - nbytes, CRLF_ASCII CRLF_ASCII) != NULL) {
+            ap_xlate_proto_from_ascii(buffer, len);
+            complete = 1;
+            break;
+        }
+    } while (status == APR_SUCCESS && left > 0);
+    /* Drain what's left */
+    if (!complete) {
+        nbytes = sizeof(drain_buffer) - 1;
+        while (status == APR_SUCCESS && nbytes) {
+            status = apr_socket_recv(backend->sock, drain_buffer, &nbytes);
+            drain_buffer[nbytes] = '\0';
+            nbytes = sizeof(drain_buffer) - 1;
+            if (strstr(drain_buffer, CRLF_ASCII CRLF_ASCII) != NULL) {
+                break;
+            }
+        }
+    }
+
+    /* Check for HTTP_OK response status */
+    if (status == APR_SUCCESS) {
+        unsigned int major, minor;
+        /* Only scan for three character status code */
+        char code_str[4];
+
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00949)
+                     "send_http_connect: response from the forward proxy: %s",
+                     buffer);
+
+        /* Extract the returned code */
+        if (sscanf(buffer, "HTTP/%u.%u %3s", &major, &minor, code_str) == 3) {
+            status = atoi(code_str);
+            if (status == HTTP_OK) {
+                status = APR_SUCCESS;
+            }
+            else {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00950)
+                             "send_http_connect: the forward proxy returned code is '%s'",
+                             code_str);
+                status = APR_INCOMPLETE;
+            }
+        }
+    }
+
+    return(status);
+}
+
+
+/* TODO: In APR 2.x: Extend apr_sockaddr_t to possibly be a path !!! */
+PROXY_DECLARE(apr_status_t) ap_proxy_connect_uds(apr_socket_t *sock,
+                                                 const char *uds_path,
+                                                 apr_pool_t *p)
+{
+#if APR_HAVE_SYS_UN_H
+    apr_status_t rv;
+    apr_os_sock_t rawsock;
+    apr_interval_time_t t;
+    struct sockaddr_un *sa;
+    apr_socklen_t addrlen, pathlen;
+
+    rv = apr_os_sock_get(&rawsock, sock);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    rv = apr_socket_timeout_get(sock, &t);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    pathlen = strlen(uds_path);
+    /* copy the UDS path (including NUL) to the sockaddr_un */
+    addrlen = APR_OFFSETOF(struct sockaddr_un, sun_path) + pathlen;
+    sa = (struct sockaddr_un *)apr_palloc(p, addrlen + 1);
+    memcpy(sa->sun_path, uds_path, pathlen + 1);
+    sa->sun_family = AF_UNIX;
+
+    do {
+        rv = connect(rawsock, (struct sockaddr*)sa, addrlen);
+    } while (rv == -1 && (rv = errno) == EINTR);
+
+    if (rv && rv != EISCONN) {
+        if ((rv == EINPROGRESS || rv == EALREADY) && (t > 0))  {
+#if APR_MAJOR_VERSION < 2
+            rv = apr_wait_for_io_or_timeout(NULL, sock, 0);
+#else
+            rv = apr_socket_wait(sock, APR_WAIT_WRITE);
+#endif
+        }
+        if (rv != APR_SUCCESS) {
+            return rv;
+        }
+    }
+
+    return APR_SUCCESS;
+#else
+    return APR_ENOTIMPL;
+#endif
+}
+
+PROXY_DECLARE(apr_status_t) ap_proxy_check_connection(const char *scheme,
+                                                      proxy_conn_rec *conn,
+                                                      server_rec *server,
+                                                      unsigned max_blank_lines,
+                                                      int flags)
+{
+    apr_status_t rv = APR_SUCCESS;
+    proxy_worker *worker = conn->worker;
+
+    if (!PROXY_WORKER_IS_USABLE(worker)) {
+        /*
+         * The worker is in error likely done by a different thread / process
+         * e.g. for a timeout or bad status. We should respect this and should
+         * not continue with a connection via this worker even if we got one.
+         */
+        rv = APR_EINVAL;
+    }
+    else if (conn->connection) {
+        /* We have a conn_rec, check the full filter stack for things like
+         * SSL alert/shutdown, filters aside data...
+         */
+        rv = ap_check_pipeline(conn->connection, conn->tmp_bb,
+                               max_blank_lines);
+        apr_brigade_cleanup(conn->tmp_bb);
+        if (rv == APR_SUCCESS) {
+            /* Some data available, the caller might not want them. */
+            if (flags & PROXY_CHECK_CONN_EMPTY) {
+                rv = APR_ENOTEMPTY;
+            }
+        }
+        else if (APR_STATUS_IS_EAGAIN(rv)) {
+            /* Filter chain is OK and empty, yet we can't determine from
+             * ap_check_pipeline (actually ap_core_input_filter) whether
+             * an empty non-blocking read is EAGAIN or EOF on the socket
+             * side (it's always SUCCESS), so check it explicitly here.
+             */
+            if (ap_proxy_is_socket_connected(conn->sock)) {
+                rv = APR_SUCCESS;
+            }
+            else {
+                rv = APR_EPIPE;
+            }
+        }
+    }
+    else if (conn->sock) {
+        /* For modules working with sockets directly, check it. */
+        if (!ap_proxy_is_socket_connected(conn->sock)) {
+            rv = APR_EPIPE;
+        }
+    }
+    else {
+        rv = APR_ENOSOCKET;
+    }
+
+    if (rv == APR_SUCCESS) {
+        if (APLOGtrace2(server)) {
+            apr_sockaddr_t *local_addr = NULL;
+            apr_socket_addr_get(&local_addr, APR_LOCAL, conn->sock);
+            ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, server,
+                         "%s: reusing backend connection %pI<>%pI",
+                         scheme, local_addr, conn->addr);
+        }
+    }
+    else if (conn->sock) {
+        /* This clears conn->scpool (and associated data), so backup and
+         * restore any ssl_hostname for this connection set earlier by
+         * ap_proxy_determine_connection().
+         */
+        char ssl_hostname[PROXY_WORKER_RFC1035_NAME_SIZE];
+        if (rv == APR_EINVAL
+                || !conn->ssl_hostname
+                || PROXY_STRNCPY(ssl_hostname, conn->ssl_hostname)) {
+            ssl_hostname[0] = '\0';
+        }
+
+        socket_cleanup(conn);
+        if (rv != APR_ENOTEMPTY) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, server, APLOGNO(00951)
+                         "%s: backend socket is disconnected.", scheme);
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_INFO, 0, server, APLOGNO(03408)
+                         "%s: reusable backend connection is not empty: "
+                         "forcibly closed", scheme);
+        }
+
+        if (ssl_hostname[0]) {
+            conn->ssl_hostname = apr_pstrdup(conn->scpool, ssl_hostname);
+        }
+    }
+
+    return rv;
+}
+
+PROXY_DECLARE(int) ap_proxy_connect_backend(const char *proxy_function,
+                                            proxy_conn_rec *conn,
+                                            proxy_worker *worker,
+                                            server_rec *s)
+{
+    apr_status_t rv;
+    int loglevel;
+    apr_sockaddr_t *backend_addr = conn->addr;
+    /* the local address to use for the outgoing connection */
+    apr_sockaddr_t *local_addr;
+    apr_socket_t *newsock;
+    void *sconf = s->module_config;
+    proxy_server_conf *conf =
+        (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
+
+    rv = ap_proxy_check_connection(proxy_function, conn, s, 0, 0);
+    if (rv == APR_EINVAL) {
+        return DECLINED;
+    }
+
+    while (rv != APR_SUCCESS && (backend_addr || conn->uds_path)) {
+#if APR_HAVE_SYS_UN_H
+        if (conn->uds_path)
+        {
+            rv = apr_socket_create(&newsock, AF_UNIX, SOCK_STREAM, 0,
+                                   conn->scpool);
+            if (rv != APR_SUCCESS) {
+                loglevel = APLOG_ERR;
+                ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(02453)
+                             "%s: error creating Unix domain socket for "
+                             "target %s:%d",
+                             proxy_function,
+                             worker->s->hostname_ex,
+                             (int)worker->s->port);
+                break;
+            }
+            conn->connection = NULL;
+
+            rv = ap_proxy_connect_uds(newsock, conn->uds_path, conn->scpool);
+            if (rv != APR_SUCCESS) {
+                apr_socket_close(newsock);
+                ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(02454)
+                             "%s: attempt to connect to Unix domain socket "
+                             "%s (%s:%d) failed",
+                             proxy_function,
+                             conn->uds_path,
+                             worker->s->hostname_ex,
+                             (int)worker->s->port);
+                break;
+            }
+
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02823)
+                         "%s: connection established with Unix domain socket "
+                         "%s (%s:%d)",
+                         proxy_function,
+                         conn->uds_path,
+                         worker->s->hostname_ex,
+                         (int)worker->s->port);
+        }
+        else
+#endif
+        {
+            if ((rv = apr_socket_create(&newsock, backend_addr->family,
+                                        SOCK_STREAM, APR_PROTO_TCP,
+                                        conn->scpool)) != APR_SUCCESS) {
+                loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
+                ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(00952)
+                             "%s: error creating fam %d socket for "
+                             "target %s:%d",
+                             proxy_function,
+                             backend_addr->family,
+                             worker->s->hostname_ex,
+                             (int)worker->s->port);
+                /*
+                 * this could be an IPv6 address from the DNS but the
+                 * local machine won't give us an IPv6 socket; hopefully the
+                 * DNS returned an additional address to try
+                 */
+                backend_addr = backend_addr->next;
+                continue;
+            }
+            conn->connection = NULL;
+
+            if (worker->s->recv_buffer_size > 0 &&
+                (rv = apr_socket_opt_set(newsock, APR_SO_RCVBUF,
+                                         worker->s->recv_buffer_size))) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00953)
+                             "apr_socket_opt_set(SO_RCVBUF): Failed to set "
+                             "ProxyReceiveBufferSize, using default");
+            }
+
+            rv = apr_socket_opt_set(newsock, APR_TCP_NODELAY, 1);
+            if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00954)
+                             "apr_socket_opt_set(APR_TCP_NODELAY): "
+                             "Failed to set");
+            }
+
+            /* Set a timeout for connecting to the backend on the socket */
+            if (worker->s->conn_timeout_set) {
+                apr_socket_timeout_set(newsock, worker->s->conn_timeout);
+            }
+            else if (worker->s->timeout_set) {
+                apr_socket_timeout_set(newsock, worker->s->timeout);
+            }
+            else if (conf->timeout_set) {
+                apr_socket_timeout_set(newsock, conf->timeout);
+            }
+            else {
+                apr_socket_timeout_set(newsock, s->timeout);
+            }
+            /* Set a keepalive option */
+            if (worker->s->keepalive) {
+                if ((rv = apr_socket_opt_set(newsock,
+                                             APR_SO_KEEPALIVE, 1)) != APR_SUCCESS) {
+                    ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00955)
+                                 "apr_socket_opt_set(SO_KEEPALIVE): Failed to set"
+                                 " Keepalive");
+                }
+            }
+            ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, s,
+                         "%s: fam %d socket created to connect to %s:%d",
+                         proxy_function, backend_addr->family,
+                         worker->s->hostname_ex, (int)worker->s->port);
+
+            if (conf->source_address_set) {
+                local_addr = apr_pmemdup(conn->scpool, conf->source_address,
+                                         sizeof(apr_sockaddr_t));
+                local_addr->pool = conn->scpool;
+                rv = apr_socket_bind(newsock, local_addr);
+                if (rv != APR_SUCCESS) {
+                    ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00956)
+                                 "%s: failed to bind socket to local address",
+                                 proxy_function);
+                }
+            }
+
+            /* make the connection out of the socket */
+            rv = apr_socket_connect(newsock, backend_addr);
+
+            /* if an error occurred, loop round and try again */
+            if (rv != APR_SUCCESS) {
+                apr_socket_close(newsock);
+                loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
+                ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(00957)
+                             "%s: attempt to connect to %pI (%s:%d) failed",
+                             proxy_function,
+                             backend_addr,
+                             worker->s->hostname_ex,
+                             (int)worker->s->port);
+                backend_addr = backend_addr->next;
+                continue;
+            }
+
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02824)
+                         "%s: connection established with %pI (%s:%d)",
+                         proxy_function,
+                         backend_addr,
+                         worker->s->hostname_ex,
+                         (int)worker->s->port);
+        }
+
+        /* Set a timeout on the socket */
+        if (worker->s->timeout_set) {
+            apr_socket_timeout_set(newsock, worker->s->timeout);
+        }
+        else if (conf->timeout_set) {
+            apr_socket_timeout_set(newsock, conf->timeout);
+        }
+        else {
+             apr_socket_timeout_set(newsock, s->timeout);
+        }
+
+        conn->sock = newsock;
+
+        if (!conn->uds_path && conn->forward) {
+            forward_info *forward = (forward_info *)conn->forward;
+            /*
+             * For HTTP CONNECT we need to prepend CONNECT request before
+             * sending our actual HTTPS requests.
+             */
+            if (forward->use_http_connect) {
+                rv = send_http_connect(conn, s);
+                /* If an error occurred, loop round and try again */
+                if (rv != APR_SUCCESS) {
+                    conn->sock = NULL;
+                    apr_socket_close(newsock);
+                    loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
+                    ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(00958)
+                                 "%s: attempt to connect to %s:%d "
+                                 "via http CONNECT through %pI (%s:%d) failed",
+                                 proxy_function,
+                                 forward->target_host, forward->target_port,
+                                 backend_addr, worker->s->hostname_ex,
+                                 (int)worker->s->port);
+                    backend_addr = backend_addr->next;
+                    continue;
+                }
+            }
+        }
+    }
+
+    if (PROXY_WORKER_IS_USABLE(worker)) {
+        /*
+         * Put the entire worker to error state if
+         * the PROXY_WORKER_IGNORE_ERRORS flag is not set.
+         * Although some connections may be alive
+         * no further connections to the worker could be made
+         */
+        if (rv != APR_SUCCESS) {
+            if (!(worker->s->status & PROXY_WORKER_IGNORE_ERRORS)) {
+                worker->s->error_time = apr_time_now();
+                worker->s->status |= PROXY_WORKER_IN_ERROR;
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00959)
+                    "ap_proxy_connect_backend disabling worker for (%s:%d) for %"
+                    APR_TIME_T_FMT "s",
+                    worker->s->hostname_ex, (int)worker->s->port,
+                    apr_time_sec(worker->s->retry));
+            }
+        }
+        else {
+            if (worker->s->retries) {
+                /*
+                 * A worker came back. So here is where we need to
+                 * either reset all params to initial conditions or
+                 * apply some sort of aging
+                 */
+            }
+            worker->s->error_time = 0;
+            worker->s->retries = 0;
+        }
+    }
+    else {
+        /*
+         * The worker is in error likely done by a different thread / process
+         * e.g. for a timeout or bad status. We should respect this and should
+         * not continue with a connection via this worker even if we got one.
+         */
+        if (rv == APR_SUCCESS) {
+            socket_cleanup(conn);
+        }
+        rv = APR_EINVAL;
+    }
+
+    return rv == APR_SUCCESS ? OK : DECLINED;
+}
+
+static apr_status_t connection_shutdown(void *theconn)
+{
+    proxy_conn_rec *conn = (proxy_conn_rec *)theconn;
+    conn_rec *c = conn->connection;
+    if (c) {
+        if (!c->aborted) {
+            apr_interval_time_t saved_timeout = 0;
+            apr_socket_timeout_get(conn->sock, &saved_timeout);
+            if (saved_timeout) {
+                apr_socket_timeout_set(conn->sock, 0);
+            }
+
+            (void)ap_shutdown_conn(c, 0);
+            c->aborted = 1;
+
+            if (saved_timeout) {
+                apr_socket_timeout_set(conn->sock, saved_timeout);
+            }
+        }
+
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(02642)
+                      "proxy: connection shutdown");
+    }
+    return APR_SUCCESS;
+}
+
+
+static int proxy_connection_create(const char *proxy_function,
+                                   proxy_conn_rec *conn,
+                                   request_rec *r, server_rec *s)
+{
+    ap_conf_vector_t *per_dir_config = (r) ? r->per_dir_config
+                                           : conn->worker->section_config;
+    apr_sockaddr_t *backend_addr = conn->addr;
+    int rc;
+    apr_interval_time_t current_timeout;
+    apr_bucket_alloc_t *bucket_alloc;
+
+    if (conn->connection) {
+        if (conn->is_ssl) {
+            /* on reuse, reinit the SSL connection dir config with the current
+             * r->per_dir_config, the previous one was reset on release.
+             */
+            ap_proxy_ssl_engine(conn->connection, per_dir_config, 1);
+        }
+        return OK;
+    }
+
+    bucket_alloc = apr_bucket_alloc_create(conn->scpool);
+    conn->tmp_bb = apr_brigade_create(conn->scpool, bucket_alloc);
+    /*
+     * The socket is now open, create a new backend server connection
+     */
+    conn->connection = ap_run_create_connection(conn->scpool, s, conn->sock,
+                                                0, NULL,
+                                                bucket_alloc);
+
+    if (!conn->connection) {
+        /*
+         * the peer reset the connection already; ap_run_create_connection()
+         * closed the socket
+         */
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0,
+                     s, APLOGNO(00960) "%s: an error occurred creating a "
+                     "new connection to %pI (%s)", proxy_function,
+                     backend_addr, conn->hostname);
+        /* XXX: Will be closed when proxy_conn is closed */
+        socket_cleanup(conn);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    /* For ssl connection to backend */
+    if (conn->is_ssl) {
+        if (!ap_proxy_ssl_engine(conn->connection, per_dir_config, 1)) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0,
+                         s, APLOGNO(00961) "%s: failed to enable ssl support "
+                         "for %pI (%s)", proxy_function,
+                         backend_addr, conn->hostname);
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+        if (conn->ssl_hostname) {
+            /* Set a note on the connection about what CN is requested,
+             * such that mod_ssl can check if it is requested to do so.
+             */
+            ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, conn->connection, 
+                          "%s: set SNI to %s for (%s)", proxy_function,
+                          conn->ssl_hostname, conn->hostname);
+            apr_table_setn(conn->connection->notes, "proxy-request-hostname",
+                           conn->ssl_hostname);
+        }
+    }
+    else {
+        /* TODO: See if this will break FTP */
+        ap_proxy_ssl_engine(conn->connection, per_dir_config, 0);
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00962)
+                 "%s: connection complete to %pI (%s)",
+                 proxy_function, backend_addr, conn->hostname);
+
+    /*
+     * save the timeout of the socket because core_pre_connection
+     * will set it to base_server->timeout
+     * (core TimeOut directive).
+     */
+    apr_socket_timeout_get(conn->sock, &current_timeout);
+    /* set up the connection filters */
+    rc = ap_run_pre_connection(conn->connection, conn->sock);
+    if (rc != OK && rc != DONE) {
+        conn->connection->aborted = 1;
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00963)
+                     "%s: pre_connection setup failed (%d)",
+                     proxy_function, rc);
+        return rc;
+    }
+    apr_socket_timeout_set(conn->sock, current_timeout);
+
+    /* Shutdown the connection before closing it (eg. SSL connections
+     * need to be close-notify-ed).
+     */
+    apr_pool_pre_cleanup_register(conn->scpool, conn, connection_shutdown);
+
+    return OK;
+}
+
+PROXY_DECLARE(int) ap_proxy_connection_create_ex(const char *proxy_function,
+                                                 proxy_conn_rec *conn,
+                                                 request_rec *r)
+{
+    return proxy_connection_create(proxy_function, conn, r, r->server);
+}
+
+PROXY_DECLARE(int) ap_proxy_connection_create(const char *proxy_function,
+                                              proxy_conn_rec *conn,
+                                              conn_rec *c, server_rec *s)
+{
+    (void) c; /* unused */
+    return proxy_connection_create(proxy_function, conn, NULL, s);
+}
+
+int ap_proxy_lb_workers(void)
+{
+    /*
+     * Since we can't resize the scoreboard when reconfiguring, we
+     * have to impose a limit on the number of workers, we are
+     * able to reconfigure to.
+     */
+    if (!lb_workers_limit)
+        lb_workers_limit = proxy_lb_workers + PROXY_DYNAMIC_BALANCER_LIMIT;
+    return lb_workers_limit;
+}
+
+static APR_INLINE int error_code_overridden(const int *elts, int nelts,
+                                            int code)
+{
+    int min = 0;
+    int max = nelts - 1;
+    AP_DEBUG_ASSERT(max >= 0);
+
+    while (min < max) {
+        int mid = (min + max) / 2;
+        int val = elts[mid];
+
+        if (val < code) {
+            min = mid + 1;
+        }
+        else if (val > code) {
+            max = mid - 1;
+        }
+        else {
+            return 1;
+        }
+    }
+
+    return elts[min] == code;
+}
+
+PROXY_DECLARE(int) ap_proxy_should_override(proxy_dir_conf *conf, int code)
+{
+    if (!conf->error_override) 
+        return 0;
+
+    if (apr_is_empty_array(conf->error_override_codes))
+        return ap_is_HTTP_ERROR(code);
+
+    /* Since error_override_codes is sorted, apply binary search. */
+    return error_code_overridden((int *)conf->error_override_codes->elts,
+                                 conf->error_override_codes->nelts,
+                                 code);
+}
+
+PROXY_DECLARE(void) ap_proxy_backend_broke(request_rec *r,
+                                           apr_bucket_brigade *brigade)
+{
+    apr_bucket *e;
+    conn_rec *c = r->connection;
+
+    r->no_cache = 1;
+    /*
+     * If this is a subrequest, then prevent also caching of the main
+     * request.
+     */
+    if (r->main)
+        r->main->no_cache = 1;
+    e = ap_bucket_error_create(HTTP_BAD_GATEWAY, NULL, c->pool,
+                               c->bucket_alloc);
+    APR_BRIGADE_INSERT_TAIL(brigade, e);
+    e = apr_bucket_eos_create(c->bucket_alloc);
+    APR_BRIGADE_INSERT_TAIL(brigade, e);
+}
+
+/*
+ * Provide a string hashing function for the proxy.
+ * We offer 2 methods: one is the APR model but we
+ * also provide our own, based on either FNV or SDBM.
+ * The reason is in case we want to use both to ensure no
+ * collisions.
+ */
+PROXY_DECLARE(unsigned int)
+ap_proxy_hashfunc(const char *str, proxy_hash_t method)
+{
+    if (method == PROXY_HASHFUNC_APR) {
+        apr_ssize_t slen = strlen(str);
+        return apr_hashfunc_default(str, &slen);
+    }
+    else if (method == PROXY_HASHFUNC_FNV) {
+        /* FNV model */
+        unsigned int hash;
+        const unsigned int fnv_prime = 0x811C9DC5;
+        for (hash = 0; *str; str++) {
+            hash *= fnv_prime;
+            hash ^= (*str);
+        }
+        return hash;
+    }
+    else { /* method == PROXY_HASHFUNC_DEFAULT */
+        /* SDBM model */
+        unsigned int hash;
+        for (hash = 0; *str; str++) {
+            hash = (*str) + (hash << 6) + (hash << 16) - hash;
+        }
+        return hash;
+    }
+}
+
+PROXY_DECLARE(apr_status_t) ap_proxy_set_wstatus(char c, int set, proxy_worker *w)
+{
+    unsigned int *status = &w->s->status;
+    char flag = toupper(c);
+    proxy_wstat_t *pwt = proxy_wstat_tbl;
+    while (pwt->bit) {
+        if (flag == pwt->flag) {
+            if (set)
+                *status |= pwt->bit;
+            else
+                *status &= ~(pwt->bit);
+            return APR_SUCCESS;
+        }
+        pwt++;
+    }
+    return APR_EINVAL;
+}
+
+PROXY_DECLARE(char *) ap_proxy_parse_wstatus(apr_pool_t *p, proxy_worker *w)
+{
+    char *ret = "";
+    unsigned int status = w->s->status;
+    proxy_wstat_t *pwt = proxy_wstat_tbl;
+    while (pwt->bit) {
+        if (status & pwt->bit)
+            ret = apr_pstrcat(p, ret, pwt->name, NULL);
+        pwt++;
+    }
+    if (!*ret) {
+        ret = "??? ";
+    }
+    if (PROXY_WORKER_IS_USABLE(w))
+        ret = apr_pstrcat(p, ret, "Ok ", NULL);
+    return ret;
+}
+
+PROXY_DECLARE(apr_status_t) ap_proxy_sync_balancer(proxy_balancer *b, server_rec *s,
+                                                    proxy_server_conf *conf)
+{
+    proxy_worker **workers;
+    int i;
+    int index;
+    proxy_worker_shared *shm;
+    proxy_balancer_method *lbmethod;
+    ap_slotmem_provider_t *storage = b->storage;
+
+    if (b->s->wupdated <= b->wupdated)
+        return APR_SUCCESS;
+    /* balancer sync */
+    lbmethod = ap_lookup_provider(PROXY_LBMETHOD, b->s->lbpname, "0");
+    if (lbmethod) {
+        b->lbmethod = lbmethod;
+    } else {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(02433)
+                     "Cannot find LB Method: %s", b->s->lbpname);
+        return APR_EINVAL;
+    }
+
+    /* worker sync */
+
+    /*
+     * Look thru the list of workers in shm
+     * and see which one(s) we are lacking...
+     * again, the cast to unsigned int is safe
+     * since our upper limit is always max_workers
+     * which is int.
+     */
+    for (index = 0; index < b->max_workers; index++) {
+        int found;
+        apr_status_t rv;
+        if ((rv = storage->dptr(b->wslot, (unsigned int)index, (void *)&shm)) != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(00965) "worker slotmem_dptr failed");
+            return APR_EGENERAL;
+        }
+        /* account for possible "holes" in the slotmem
+         * (eg: slots 0-2 are used, but 3 isn't, but 4-5 is)
+         */
+        if (!shm->hash.def || !shm->hash.fnv)
+            continue;
+        found = 0;
+        workers = (proxy_worker **)b->workers->elts;
+        for (i = 0; i < b->workers->nelts; i++, workers++) {
+            proxy_worker *worker = *workers;
+            if (worker->hash.def == shm->hash.def && worker->hash.fnv == shm->hash.fnv) {
+                found = 1;
+                ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02402)
+                             "re-grabbing shm[%d] (0x%pp) for worker: %s", i, (void *)shm,
+                             ap_proxy_worker_name(conf->pool, worker));
+                break;
+            }
+        }
+        if (!found) {
+            proxy_worker **runtime;
+            /* XXX: a thread mutex is maybe enough here */
+            apr_global_mutex_lock(proxy_mutex);
+            runtime = apr_array_push(b->workers);
+            *runtime = apr_pcalloc(conf->pool, sizeof(proxy_worker));
+            apr_global_mutex_unlock(proxy_mutex);
+            (*runtime)->hash = shm->hash;
+            (*runtime)->balancer = b;
+            (*runtime)->s = shm;
+
+            rv = ap_proxy_initialize_worker(*runtime, s, conf->pool);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(00966) "Cannot init worker");
+                return rv;
+            }
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02403)
+                         "grabbing shm[%d] (0x%pp) for worker: %s", i, (void *)shm,
+                         (*runtime)->s->name_ex);
+        }
+    }
+    if (b->s->need_reset) {
+        if (b->lbmethod && b->lbmethod->reset)
+            b->lbmethod->reset(b, s);
+        b->s->need_reset = 0;
+    }
+    b->wupdated = b->s->wupdated;
+    return APR_SUCCESS;
+}
+
+PROXY_DECLARE(proxy_worker_shared *) ap_proxy_find_workershm(ap_slotmem_provider_t *storage,
+                                                               ap_slotmem_instance_t *slot,
+                                                               proxy_worker *worker,
+                                                               unsigned int *index)
+{
+    proxy_worker_shared *shm;
+    unsigned int i, limit;
+    limit = storage->num_slots(slot);
+    for (i = 0; i < limit; i++) {
+        if (storage->dptr(slot, i, (void *)&shm) != APR_SUCCESS) {
+            return NULL;
+        }
+        if ((worker->s->hash.def == shm->hash.def) &&
+            (worker->s->hash.fnv == shm->hash.fnv)) {
+            *index = i;
+            return shm;
+        }
+    }
+    return NULL;
+}
+
+PROXY_DECLARE(proxy_balancer_shared *) ap_proxy_find_balancershm(ap_slotmem_provider_t *storage,
+                                                                 ap_slotmem_instance_t *slot,
+                                                                 proxy_balancer *balancer,
+                                                                 unsigned int *index)
+{
+    proxy_balancer_shared *shm;
+    unsigned int i, limit;
+    limit = storage->num_slots(slot);
+    for (i = 0; i < limit; i++) {
+        if (storage->dptr(slot, i, (void *)&shm) != APR_SUCCESS) {
+            return NULL;
+        }
+        if ((balancer->s->hash.def == shm->hash.def) &&
+            (balancer->s->hash.fnv == shm->hash.fnv)) {
+            *index = i;
+            return shm;
+        }
+    }
+    return NULL;
+}
+
+typedef struct header_connection {
+    apr_pool_t *pool;
+    apr_array_header_t *array;
+    const char *first;
+    unsigned int closed:1;
+} header_connection;
+
+static int find_conn_headers(void *data, const char *key, const char *val)
+{
+    header_connection *x = data;
+    const char *name;
+
+    do {
+        while (*val == ',' || *val == ';') {
+            val++;
+        }
+        name = ap_get_token(x->pool, &val, 0);
+        if (!strcasecmp(name, "close")) {
+            x->closed = 1;
+        }
+        if (!x->first) {
+            x->first = name;
+        }
+        else {
+            const char **elt;
+            if (!x->array) {
+                x->array = apr_array_make(x->pool, 4, sizeof(char *));
+            }
+            elt = apr_array_push(x->array);
+            *elt = name;
+        }
+    } while (*val);
+
+    return 1;
+}
+
+/**
+ * Remove all headers referred to by the Connection header.
+ */
+static int ap_proxy_clear_connection(request_rec *r, apr_table_t *headers)
+{
+    const char **name;
+    header_connection x;
+
+    x.pool = r->pool;
+    x.array = NULL;
+    x.first = NULL;
+    x.closed = 0;
+
+    apr_table_unset(headers, "Proxy-Connection");
+
+    apr_table_do(find_conn_headers, &x, headers, "Connection", NULL);
+    if (x.first) {
+        /* fast path - no memory allocated for one header */
+        apr_table_unset(headers, "Connection");
+        apr_table_unset(headers, x.first);
+    }
+    if (x.array) {
+        /* two or more headers */
+        while ((name = apr_array_pop(x.array))) {
+            apr_table_unset(headers, *name);
+        }
+    }
+
+    return x.closed;
+}
+
+PROXY_DECLARE(int) ap_proxy_create_hdrbrgd(apr_pool_t *p,
+                                            apr_bucket_brigade *header_brigade,
+                                            request_rec *r,
+                                            proxy_conn_rec *p_conn,
+                                            proxy_worker *worker,
+                                            proxy_server_conf *conf,
+                                            apr_uri_t *uri,
+                                            char *url, char *server_portstr,
+                                            char **old_cl_val,
+                                            char **old_te_val)
+{
+    int rc = OK;
+    conn_rec *c = r->connection;
+    int counter;
+    char *buf;
+    apr_table_t *saved_headers_in = r->headers_in;
+    const char *saved_host = apr_table_get(saved_headers_in, "Host");
+    const apr_array_header_t *headers_in_array;
+    const apr_table_entry_t *headers_in;
+    apr_bucket *e;
+    int force10 = 0, do_100_continue = 0;
+    conn_rec *origin = p_conn->connection;
+    const char *host, *val;
+    proxy_dir_conf *dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
+
+    /*
+     * HTTP "Ping" test? Easiest is 100-Continue. However:
+     * To be compliant, we only use 100-Continue for requests with bodies.
+     * We also make sure we won't be talking HTTP/1.0 as well.
+     */
+    if (apr_table_get(r->subprocess_env, "force-proxy-request-1.0")) {
+        force10 = 1;
+    }
+    else if (apr_table_get(r->notes, "proxy-100-continue")
+             || PROXY_SHOULD_PING_100_CONTINUE(worker, r)) {
+        do_100_continue = 1;
+    }
+    if (force10 || apr_table_get(r->subprocess_env, "proxy-nokeepalive")) {
+        if (origin) {
+            origin->keepalive = AP_CONN_CLOSE;
+        }
+        p_conn->close = 1;
+    }
+
+    if (force10) {
+        buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL);
+    }
+    else {
+        buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL);
+    }
+    ap_xlate_proto_to_ascii(buf, strlen(buf));
+    e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
+    APR_BRIGADE_INSERT_TAIL(header_brigade, e);
+
+    /*
+     * Make a copy on r->headers_in for the request we make to the backend,
+     * modify the copy in place according to our configuration and connection
+     * handling, use it to fill in the forwarded headers' brigade, and finally
+     * restore the saved/original ones in r->headers_in.
+     *
+     * Note: We need to take r->pool for apr_table_copy as the key / value
+     * pairs in r->headers_in have been created out of r->pool and
+     * p might be (and actually is) a longer living pool.
+     * This would trigger the bad pool ancestry abort in apr_table_copy if
+     * apr is compiled with APR_POOL_DEBUG.
+     *
+     * icing: if p indeed lives longer than r->pool, we should allocate
+     * all new header values from r->pool as well and avoid leakage.
+     */
+    r->headers_in = apr_table_copy(r->pool, saved_headers_in);
+
+    /* Return the original Transfer-Encoding and/or Content-Length values
+     * then drop the headers, they must be set by the proxy handler based
+     * on the actual body being forwarded.
+     */
+    if ((*old_te_val = (char *)apr_table_get(r->headers_in,
+                                             "Transfer-Encoding"))) {
+        apr_table_unset(r->headers_in, "Transfer-Encoding");
+    }
+    if ((*old_cl_val = (char *)apr_table_get(r->headers_in,
+                                             "Content-Length"))) {
+        apr_table_unset(r->headers_in, "Content-Length");
+    }
+
+    /* Clear out hop-by-hop request headers not to forward */
+    if (ap_proxy_clear_connection(r, r->headers_in) < 0) {
+        rc = HTTP_BAD_REQUEST;
+        goto cleanup;
+    }
+
+    /* RFC2616 13.5.1 says we should strip these */
+    apr_table_unset(r->headers_in, "Keep-Alive");
+    apr_table_unset(r->headers_in, "Upgrade");
+    apr_table_unset(r->headers_in, "Trailer");
+    apr_table_unset(r->headers_in, "TE");
+
+    /* Compute Host header */
+    if (dconf->preserve_host == 0) {
+        if (ap_strchr_c(uri->hostname, ':')) { /* if literal IPv6 address */
+            if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
+                host = apr_pstrcat(r->pool, "[", uri->hostname, "]:",
+                                   uri->port_str, NULL);
+            } else {
+                host = apr_pstrcat(r->pool, "[", uri->hostname, "]", NULL);
+            }
+        } else {
+            if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
+                host = apr_pstrcat(r->pool, uri->hostname, ":",
+                                   uri->port_str, NULL);
+            } else {
+                host = uri->hostname;
+            }
+        }
+        apr_table_setn(r->headers_in, "Host", host);
+    }
+    else {
+        /* don't want to use r->hostname as the incoming header might have a
+         * port attached, let's use the original header.
+         */
+        host = saved_host;
+        if (!host) {
+            host =  r->server->server_hostname;
+            ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01092)
+                          "no HTTP 0.9 request (with no host line) "
+                          "on incoming request and preserve host set "
+                          "forcing hostname to be %s for uri %s",
+                          host, r->uri);
+            apr_table_setn(r->headers_in, "Host", host);
+        }
+    }
+
+    /* handle Via */
+    if (conf->viaopt == via_block) {
+        /* Block all outgoing Via: headers */
+        apr_table_unset(r->headers_in, "Via");
+    } else if (conf->viaopt != via_off) {
+        const char *server_name = ap_get_server_name(r);
+        /* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
+         * then the server name returned by ap_get_server_name() is the
+         * origin server name (which does make too much sense with Via: headers)
+         * so we use the proxy vhost's name instead.
+         */
+        if (server_name == r->hostname)
+            server_name = r->server->server_hostname;
+        /* Create a "Via:" request header entry and merge it */
+        /* Generate outgoing Via: header with/without server comment: */
+        apr_table_mergen(r->headers_in, "Via",
+                         (conf->viaopt == via_full)
+                         ? apr_psprintf(p, "%d.%d %s%s (%s)",
+                                        HTTP_VERSION_MAJOR(r->proto_num),
+                                        HTTP_VERSION_MINOR(r->proto_num),
+                                        server_name, server_portstr,
+                                        AP_SERVER_BASEVERSION)
+                         : apr_psprintf(p, "%d.%d %s%s",
+                                        HTTP_VERSION_MAJOR(r->proto_num),
+                                        HTTP_VERSION_MINOR(r->proto_num),
+                                        server_name, server_portstr)
+                         );
+    }
+
+    /* Use HTTP/1.1 100-Continue as quick "HTTP ping" test
+     * to backend
+     */
+    if (do_100_continue) {
+        /* Add the Expect header if not already there. */
+        if (!(val = apr_table_get(r->headers_in, "Expect"))
+            || (ap_cstr_casecmp(val, "100-Continue") != 0 /* fast path */
+                && !ap_find_token(r->pool, val, "100-Continue"))) {
+            apr_table_mergen(r->headers_in, "Expect", "100-Continue");
+        }
+    }
+    else {
+        /* XXX: we should strip the 100-continue token only from the
+         * Expect header, but are there others actually used anywhere?
+         */
+        apr_table_unset(r->headers_in, "Expect");
+    }
+
+    /* X-Forwarded-*: handling
+     *
+     * XXX Privacy Note:
+     * -----------------
+     *
+     * These request headers are only really useful when the mod_proxy
+     * is used in a reverse proxy configuration, so that useful info
+     * about the client can be passed through the reverse proxy and on
+     * to the backend server, which may require the information to
+     * function properly.
+     *
+     * In a forward proxy situation, these options are a potential
+     * privacy violation, as information about clients behind the proxy
+     * are revealed to arbitrary servers out there on the internet.
+     *
+     * The HTTP/1.1 Via: header is designed for passing client
+     * information through proxies to a server, and should be used in
+     * a forward proxy configuration instead of X-Forwarded-*. See the
+     * ProxyVia option for details.
+     */
+    if (dconf->add_forwarded_headers) {
+        if (PROXYREQ_REVERSE == r->proxyreq) {
+            /* Add X-Forwarded-For: so that the upstream has a chance to
+             * determine, where the original request came from.
+             */
+            apr_table_mergen(r->headers_in, "X-Forwarded-For",
+                             r->useragent_ip);
+
+            /* Add X-Forwarded-Host: so that upstream knows what the
+             * original request hostname was.
+             */
+            if (saved_host) {
+                apr_table_mergen(r->headers_in, "X-Forwarded-Host",
+                                 saved_host);
+            }
+
+            /* Add X-Forwarded-Server: so that upstream knows what the
+             * name of this proxy server is (if there are more than one)
+             * XXX: This duplicates Via: - do we strictly need it?
+             */
+            apr_table_mergen(r->headers_in, "X-Forwarded-Server",
+                             r->server->server_hostname);
+        }
+    }
+
+    /* Do we want to strip Proxy-Authorization ?
+     * If we haven't used it, then NO
+     * If we have used it then MAYBE: RFC2616 says we MAY propagate it.
+     * So let's make it configurable by env.
+     */
+    if (r->user != NULL /* we've authenticated */
+        && !apr_table_get(r->subprocess_env, "Proxy-Chain-Auth")) {
+        apr_table_unset(r->headers_in, "Proxy-Authorization");
+    }
+
+    /* for sub-requests, ignore freshness/expiry headers */
+    if (r->main) {
+        apr_table_unset(r->headers_in, "If-Match");
+        apr_table_unset(r->headers_in, "If-Modified-Since");
+        apr_table_unset(r->headers_in, "If-Range");
+        apr_table_unset(r->headers_in, "If-Unmodified-Since");
+        apr_table_unset(r->headers_in, "If-None-Match");
+    }
+
+    /* run hook to fixup the request we are about to send */
+    proxy_run_fixups(r);
+
+    /* We used to send `Host: ` always first, so let's keep it that
+     * way. No telling which legacy backend is relying on this.
+     * If proxy_run_fixups() changed the value, use it (though removal
+     * is ignored).
+     */
+    val = apr_table_get(r->headers_in, "Host");
+    if (val) {
+        apr_table_unset(r->headers_in, "Host");
+        host = val;
+    }
+    buf = apr_pstrcat(p, "Host: ", host, CRLF, NULL);
+    ap_xlate_proto_to_ascii(buf, strlen(buf));
+    e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
+    APR_BRIGADE_INSERT_TAIL(header_brigade, e);
+
+    /* Append the (remaining) headers to the brigade */
+    headers_in_array = apr_table_elts(r->headers_in);
+    headers_in = (const apr_table_entry_t *) headers_in_array->elts;
+    for (counter = 0; counter < headers_in_array->nelts; counter++) {
+        if (headers_in[counter].key == NULL
+            || headers_in[counter].val == NULL) {
+            continue;
+        }
+
+        buf = apr_pstrcat(p, headers_in[counter].key, ": ",
+                          headers_in[counter].val, CRLF,
+                          NULL);
+        ap_xlate_proto_to_ascii(buf, strlen(buf));
+        e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
+        APR_BRIGADE_INSERT_TAIL(header_brigade, e);
+    }
+
+cleanup:
+    r->headers_in = saved_headers_in;
+    return rc;
+}
+
+PROXY_DECLARE(int) ap_proxy_prefetch_input(request_rec *r,
+                                           proxy_conn_rec *backend,
+                                           apr_bucket_brigade *input_brigade,
+                                           apr_read_type_e block,
+                                           apr_off_t *bytes_read,
+                                           apr_off_t max_read)
+{
+    apr_pool_t *p = r->pool;
+    conn_rec *c = r->connection;
+    apr_bucket_brigade *temp_brigade;
+    apr_status_t status;
+    apr_off_t bytes;
+
+    *bytes_read = 0;
+    if (max_read < APR_BUCKET_BUFF_SIZE) {
+        max_read = APR_BUCKET_BUFF_SIZE;
+    }
+
+    /* Prefetch max_read bytes
+     *
+     * This helps us avoid any election of C-L v.s. T-E
+     * request bodies, since we are willing to keep in
+     * memory this much data, in any case.  This gives
+     * us an instant C-L election if the body is of some
+     * reasonable size.
+     */
+    temp_brigade = apr_brigade_create(p, input_brigade->bucket_alloc);
+
+    /* Account for saved input, if any. */
+    apr_brigade_length(input_brigade, 0, bytes_read);
+
+    /* Ensure we don't hit a wall where we have a buffer too small for
+     * ap_get_brigade's filters to fetch us another bucket, surrender
+     * once we hit 80 bytes (an arbitrary value) less than max_read.
+     */
+    while (*bytes_read < max_read - 80
+           && (APR_BRIGADE_EMPTY(input_brigade)
+               || !APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade)))) {
+        status = ap_get_brigade(r->input_filters, temp_brigade,
+                                AP_MODE_READBYTES, block,
+                                max_read - *bytes_read);
+        /* ap_get_brigade may return success with an empty brigade
+         * for a non-blocking read which would block
+         */
+        if (block == APR_NONBLOCK_READ
+                && ((status == APR_SUCCESS && APR_BRIGADE_EMPTY(temp_brigade))
+                    || APR_STATUS_IS_EAGAIN(status))) {
+            break;
+        }
+        if (status != APR_SUCCESS) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01095)
+                          "prefetch request body failed to %pI (%s)"
+                          " from %s (%s)", backend->addr,
+                          backend->hostname ? backend->hostname : "",
+                          c->client_ip, c->remote_host ? c->remote_host : "");
+            return ap_map_http_request_error(status, HTTP_BAD_REQUEST);
+        }
+
+        apr_brigade_length(temp_brigade, 1, &bytes);
+        *bytes_read += bytes;
+
+        /*
+         * Save temp_brigade in input_brigade. (At least) in the SSL case
+         * temp_brigade contains transient buckets whose data would get
+         * overwritten during the next call of ap_get_brigade in the loop.
+         * ap_save_brigade ensures these buckets to be set aside.
+         * Calling ap_save_brigade with NULL as filter is OK, because
+         * input_brigade already has been created and does not need to get
+         * created by ap_save_brigade.
+         */
+        status = ap_save_brigade(NULL, &input_brigade, &temp_brigade, p);
+        if (status != APR_SUCCESS) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01096)
+                          "processing prefetched request body failed"
+                          " to %pI (%s) from %s (%s)", backend->addr,
+                          backend->hostname ? backend->hostname : "",
+                          c->client_ip, c->remote_host ? c->remote_host : "");
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+    }
+
+    return OK;
+}
+
+PROXY_DECLARE(int) ap_proxy_read_input(request_rec *r,
+                                       proxy_conn_rec *backend,
+                                       apr_bucket_brigade *bb,
+                                       apr_off_t max_read)
+{
+    apr_bucket_alloc_t *bucket_alloc = bb->bucket_alloc;
+    apr_read_type_e block = (backend->connection) ? APR_NONBLOCK_READ
+                                                  : APR_BLOCK_READ;
+    apr_status_t status;
+    int rv;
+
+    for (;;) {
+        apr_brigade_cleanup(bb);
+        status = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
+                                block, max_read);
+        if (block == APR_BLOCK_READ
+                || (!(status == APR_SUCCESS && APR_BRIGADE_EMPTY(bb))
+                    && !APR_STATUS_IS_EAGAIN(status))) {
+            break;
+        }
+
+        /* Flush and retry (blocking) */
+        apr_brigade_cleanup(bb);
+        rv = ap_proxy_pass_brigade(bucket_alloc, r, backend,
+                                   backend->connection, bb, 1);
+        if (rv != OK) {
+            return rv;
+        }
+        block = APR_BLOCK_READ;
+    }
+
+    if (status != APR_SUCCESS) {
+        conn_rec *c = r->connection;
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02608)
+                      "read request body failed to %pI (%s)"
+                      " from %s (%s)", backend->addr,
+                      backend->hostname ? backend->hostname : "",
+                      c->client_ip, c->remote_host ? c->remote_host : "");
+        return ap_map_http_request_error(status, HTTP_BAD_REQUEST);
+    }
+
+    return OK;
+}
+
+PROXY_DECLARE(int) ap_proxy_spool_input(request_rec *r,
+                                        proxy_conn_rec *backend,
+                                        apr_bucket_brigade *input_brigade,
+                                        apr_off_t *bytes_spooled,
+                                        apr_off_t max_mem_spool)
+{
+    apr_pool_t *p = r->pool;
+    int seen_eos = 0, rv = OK;
+    apr_status_t status = APR_SUCCESS;
+    apr_bucket_alloc_t *bucket_alloc = input_brigade->bucket_alloc;
+    apr_bucket_brigade *body_brigade;
+    apr_bucket *e;
+    apr_off_t bytes, fsize = 0;
+    apr_file_t *tmpfile = NULL;
+
+    *bytes_spooled = 0;
+    body_brigade = apr_brigade_create(p, bucket_alloc);
+
+    do {
+        if (APR_BRIGADE_EMPTY(input_brigade)) {
+            rv = ap_proxy_read_input(r, backend, input_brigade,
+                                     HUGE_STRING_LEN);
+            if (rv != OK) {
+                return rv;
+            }
+        }
+
+        /* If this brigade contains EOS, either stop or remove it. */
+        if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
+            seen_eos = 1;
+        }
+
+        apr_brigade_length(input_brigade, 1, &bytes);
+
+        if (*bytes_spooled + bytes > max_mem_spool) {
+            /* can't spool any more in memory; write latest brigade to disk */
+            if (tmpfile == NULL) {
+                const char *temp_dir;
+                char *template;
+
+                status = apr_temp_dir_get(&temp_dir, p);
+                if (status != APR_SUCCESS) {
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01089)
+                                  "search for temporary directory failed");
+                    return HTTP_INTERNAL_SERVER_ERROR;
+                }
+                apr_filepath_merge(&template, temp_dir,
+                                   "modproxy.tmp.XXXXXX",
+                                   APR_FILEPATH_NATIVE, p);
+                status = apr_file_mktemp(&tmpfile, template, 0, p);
+                if (status != APR_SUCCESS) {
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01090)
+                                  "creation of temporary file in directory "
+                                  "%s failed", temp_dir);
+                    return HTTP_INTERNAL_SERVER_ERROR;
+                }
+            }
+            for (e = APR_BRIGADE_FIRST(input_brigade);
+                 e != APR_BRIGADE_SENTINEL(input_brigade);
+                 e = APR_BUCKET_NEXT(e)) {
+                const char *data;
+                apr_size_t bytes_read, bytes_written;
+
+                apr_bucket_read(e, &data, &bytes_read, APR_BLOCK_READ);
+                status = apr_file_write_full(tmpfile, data, bytes_read, &bytes_written);
+                if (status != APR_SUCCESS) {
+                    const char *tmpfile_name;
+
+                    if (apr_file_name_get(&tmpfile_name, tmpfile) != APR_SUCCESS) {
+                        tmpfile_name = "(unknown)";
+                    }
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01091)
+                                  "write to temporary file %s failed",
+                                  tmpfile_name);
+                    return HTTP_INTERNAL_SERVER_ERROR;
+                }
+                AP_DEBUG_ASSERT(bytes_read == bytes_written);
+                fsize += bytes_written;
+            }
+            apr_brigade_cleanup(input_brigade);
+        }
+        else {
+
+            /*
+             * Save input_brigade in body_brigade. (At least) in the SSL case
+             * input_brigade contains transient buckets whose data would get
+             * overwritten during the next call of ap_get_brigade in the loop.
+             * ap_save_brigade ensures these buckets to be set aside.
+             * Calling ap_save_brigade with NULL as filter is OK, because
+             * body_brigade already has been created and does not need to get
+             * created by ap_save_brigade.
+             */
+            status = ap_save_brigade(NULL, &body_brigade, &input_brigade, p);
+            if (status != APR_SUCCESS) {
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+
+        }
+
+        *bytes_spooled += bytes;
+    } while (!seen_eos);
+
+    APR_BRIGADE_CONCAT(input_brigade, body_brigade);
+    if (tmpfile) {
+        apr_brigade_insert_file(input_brigade, tmpfile, 0, fsize, p);
+    }
+    if (apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) {
+        e = apr_bucket_immortal_create(CRLF_ASCII, 2, bucket_alloc);
+        APR_BRIGADE_INSERT_TAIL(input_brigade, e);
+    }
+    if (tmpfile) {
+        /* We dropped metadata buckets when spooling to tmpfile,
+         * terminate with EOS to allow for flushing in a one go.
+         */
+        e = apr_bucket_eos_create(bucket_alloc);
+        APR_BRIGADE_INSERT_TAIL(input_brigade, e);
+    }
+    return OK;
+}
+
+PROXY_DECLARE(int) ap_proxy_pass_brigade(apr_bucket_alloc_t *bucket_alloc,
+                                         request_rec *r, proxy_conn_rec *p_conn,
+                                         conn_rec *origin, apr_bucket_brigade *bb,
+                                         int flush)
+{
+    apr_status_t status;
+    apr_off_t transferred;
+
+    if (flush) {
+        apr_bucket *e = apr_bucket_flush_create(bucket_alloc);
+        APR_BRIGADE_INSERT_TAIL(bb, e);
+    }
+    apr_brigade_length(bb, 0, &transferred);
+    if (transferred != -1)
+        p_conn->worker->s->transferred += transferred;
+    status = ap_pass_brigade(origin->output_filters, bb);
+    /* Cleanup the brigade now to avoid buckets lifetime
+     * issues in case of error returned below. */
+    apr_brigade_cleanup(bb);
+    if (status != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01084)
+                      "pass request body failed to %pI (%s)",
+                      p_conn->addr, p_conn->hostname);
+        if (origin->aborted) {
+            const char *ssl_note;
+
+            if (((ssl_note = apr_table_get(origin->notes, "SSL_connect_rv"))
+                 != NULL) && (strcmp(ssl_note, "err") == 0)) {
+                return ap_proxyerror(r, HTTP_INTERNAL_SERVER_ERROR,
+                                     "Error during SSL Handshake with"
+                                     " remote server");
+            }
+            return APR_STATUS_IS_TIMEUP(status) ? HTTP_GATEWAY_TIME_OUT : HTTP_BAD_GATEWAY;
+        }
+        else {
+            return HTTP_BAD_REQUEST;
+        }
+    }
+    return OK;
+}
+
+/* Fill in unknown schemes from apr_uri_port_of_scheme() */
+
+typedef struct proxy_schemes_t {
+    const char *name;
+    apr_port_t default_port;
+} proxy_schemes_t ;
+
+static proxy_schemes_t pschemes[] =
+{
+    {"fcgi",     8000},
+    {"ajp",      AJP13_DEF_PORT},
+    {"scgi",     SCGI_DEF_PORT},
+    {"h2c",      DEFAULT_HTTP_PORT},
+    {"h2",       DEFAULT_HTTPS_PORT},
+    {"ws",       DEFAULT_HTTP_PORT},
+    {"wss",      DEFAULT_HTTPS_PORT},
+    { NULL, 0xFFFF }     /* unknown port */
+};
+
+PROXY_DECLARE(apr_port_t) ap_proxy_port_of_scheme(const char *scheme)
+{
+    if (scheme) {
+        apr_port_t port;
+        if ((port = apr_uri_port_of_scheme(scheme)) != 0) {
+            return port;
+        } else {
+            proxy_schemes_t *pscheme;
+            for (pscheme = pschemes; pscheme->name != NULL; ++pscheme) {
+                if (ap_cstr_casecmp(scheme, pscheme->name) == 0) {
+                    return pscheme->default_port;
+                }
+            }
+        }
+    }
+    return 0;
+}
+
+static APR_INLINE int ap_filter_should_yield(ap_filter_t *f)
+{
+    return f->c->data_in_output_filters;
+}
+
+static APR_INLINE int ap_filter_output_pending(conn_rec *c)
+{
+    ap_filter_t *f = c->output_filters;
+    while (f->next) {
+        f = f->next;
+    }
+    if (f->frec->filter_func.out_func(f, NULL)) {
+        return AP_FILTER_ERROR;
+    }
+    return c->data_in_output_filters ? OK : DECLINED;
+}
+
+PROXY_DECLARE(apr_status_t) ap_proxy_buckets_lifetime_transform(request_rec *r,
+                                                      apr_bucket_brigade *from,
+                                                      apr_bucket_brigade *to)
+{
+    apr_bucket *e;
+    apr_bucket *new;
+    const char *data;
+    apr_size_t bytes;
+    apr_status_t rv = APR_SUCCESS;
+    apr_bucket_alloc_t *bucket_alloc = to->bucket_alloc;
+
+    apr_brigade_cleanup(to);
+    for (e = APR_BRIGADE_FIRST(from);
+         e != APR_BRIGADE_SENTINEL(from);
+         e = APR_BUCKET_NEXT(e)) {
+        if (!APR_BUCKET_IS_METADATA(e)) {
+            apr_bucket_read(e, &data, &bytes, APR_BLOCK_READ);
+            new = apr_bucket_transient_create(data, bytes, bucket_alloc);
+            APR_BRIGADE_INSERT_TAIL(to, new);
+        }
+        else if (APR_BUCKET_IS_FLUSH(e)) {
+            new = apr_bucket_flush_create(bucket_alloc);
+            APR_BRIGADE_INSERT_TAIL(to, new);
+        }
+        else if (APR_BUCKET_IS_EOS(e)) {
+            new = apr_bucket_eos_create(bucket_alloc);
+            APR_BRIGADE_INSERT_TAIL(to, new);
+        }
+        else {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(03304)
+                          "Unhandled bucket type of type %s in"
+                          " ap_proxy_buckets_lifetime_transform", e->type->name);
+            rv = APR_EGENERAL;
+        }
+    }
+    return rv;
+}
+
+/* An arbitrary large value to address pathological case where we keep
+ * reading from one side only, without scheduling the other direction for
+ * too long. This can happen with large MTU and small read buffers, like
+ * micro-benchmarking huge files bidirectional transfer with client, proxy
+ * and backend on localhost for instance. Though we could just ignore the
+ * case and let the sender stop by itself at some point when/if it needs to
+ * receive data, or the receiver stop when/if it needs to send...
+ */
+#define PROXY_TRANSFER_MAX_READS 10000
+
+PROXY_DECLARE(apr_status_t) ap_proxy_transfer_between_connections(
+                                                       request_rec *r,
+                                                       conn_rec *c_i,
+                                                       conn_rec *c_o,
+                                                       apr_bucket_brigade *bb_i,
+                                                       apr_bucket_brigade *bb_o,
+                                                       const char *name,
+                                                       int *sent,
+                                                       apr_off_t bsize,
+                                                       int flags)
+{
+    apr_status_t rv;
+    int flush_each = 0;
+    unsigned int num_reads = 0;
+#ifdef DEBUGGING
+    apr_off_t len;
+#endif
+
+    /*
+     * Compat: since FLUSH_EACH is default (and zero) for legacy reasons, we
+     * pretend it's no FLUSH_AFTER nor YIELD_PENDING flags, the latter because
+     * flushing would defeat the purpose of checking for pending data (hence
+     * determine whether or not the output chain/stack is full for stopping).
+     */
+    if (!(flags & (AP_PROXY_TRANSFER_FLUSH_AFTER |
+                   AP_PROXY_TRANSFER_YIELD_PENDING))) {
+        flush_each = 1;
+    }
+
+    for (;;) {
+        apr_brigade_cleanup(bb_i);
+        rv = ap_get_brigade(c_i->input_filters, bb_i, AP_MODE_READBYTES,
+                            APR_NONBLOCK_READ, bsize);
+        if (rv != APR_SUCCESS) {
+            if (!APR_STATUS_IS_EAGAIN(rv) && !APR_STATUS_IS_EOF(rv)) {
+                ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, APLOGNO(03308)
+                              "ap_proxy_transfer_between_connections: "
+                              "error on %s - ap_get_brigade",
+                              name);
+                if (rv == APR_INCOMPLETE) {
+                    /* Don't return APR_INCOMPLETE, it'd mean "should yield"
+                     * for the caller, while it means "incomplete body" here
+                     * from ap_http_filter(), which is an error.
+                     */
+                    rv = APR_EGENERAL;
+                }
+            }
+            break;
+        }
+
+        if (c_o->aborted) {
+            apr_brigade_cleanup(bb_i);
+            flags &= ~AP_PROXY_TRANSFER_FLUSH_AFTER;
+            rv = APR_EPIPE;
+            break;
+        }
+        if (APR_BRIGADE_EMPTY(bb_i)) {
+            break;
+        }
+#ifdef DEBUGGING
+        len = -1;
+        apr_brigade_length(bb_i, 0, &len);
+        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03306)
+                      "ap_proxy_transfer_between_connections: "
+                      "read %" APR_OFF_T_FMT
+                      " bytes from %s", len, name);
+#endif
+        if (sent) {
+            *sent = 1;
+        }
+        ap_proxy_buckets_lifetime_transform(r, bb_i, bb_o);
+        if (flush_each) {
+            apr_bucket *b;
+            /*
+             * Do not use ap_fflush here since this would cause the flush
+             * bucket to be sent in a separate brigade afterwards which
+             * causes some filters to set aside the buckets from the first
+             * brigade and process them when FLUSH arrives in the second
+             * brigade. As set asides of our transformed buckets involve
+             * memory copying we try to avoid this. If we have the flush
+             * bucket in the first brigade they directly process the
+             * buckets without setting them aside.
+             */
+            b = apr_bucket_flush_create(bb_o->bucket_alloc);
+            APR_BRIGADE_INSERT_TAIL(bb_o, b);
+        }
+        rv = ap_pass_brigade(c_o->output_filters, bb_o);
+        apr_brigade_cleanup(bb_o);
+        if (rv != APR_SUCCESS) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(03307)
+                          "ap_proxy_transfer_between_connections: "
+                          "error on %s - ap_pass_brigade",
+                          name);
+            flags &= ~AP_PROXY_TRANSFER_FLUSH_AFTER;
+            break;
+        }
+
+        /* Yield if the output filters stack is full? This is to avoid
+         * blocking and give the caller a chance to POLLOUT async.
+         */
+        if ((flags & AP_PROXY_TRANSFER_YIELD_PENDING)
+                && ap_filter_should_yield(c_o->output_filters)) {
+            int rc = ap_filter_output_pending(c_o);
+            if (rc == OK) {
+                ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                              "ap_proxy_transfer_between_connections: "
+                              "yield (output pending)");
+                rv = APR_INCOMPLETE;
+                break;
+            }
+            if (rc != DECLINED) {
+                rv = AP_FILTER_ERROR;
+                break;
+            }
+        }
+
+        /* Yield if we keep hold of the thread for too long? This gives
+         * the caller a chance to schedule the other direction too.
+         */
+        if ((flags & AP_PROXY_TRANSFER_YIELD_MAX_READS)
+                && ++num_reads > PROXY_TRANSFER_MAX_READS) {
+            ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                          "ap_proxy_transfer_between_connections: "
+                          "yield (max reads)");
+            rv = APR_SUCCESS;
+            break;
+        }
+    }
+
+    if (flags & AP_PROXY_TRANSFER_FLUSH_AFTER) {
+        ap_fflush(c_o->output_filters, bb_o);
+        apr_brigade_cleanup(bb_o);
+    }
+    apr_brigade_cleanup(bb_i);
+
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE2, rv, r,
+                  "ap_proxy_transfer_between_connections complete (%s %pI)",
+                  (c_i == r->connection) ? "to" : "from",
+                  (c_i == r->connection) ? c_o->client_addr
+                                         : c_i->client_addr);
+
+    if (APR_STATUS_IS_EAGAIN(rv)) {
+        rv = APR_SUCCESS;
+    }
+    return rv;
+}
+
+struct proxy_tunnel_conn {
+    /* the other side of the tunnel */
+    struct proxy_tunnel_conn *other;
+
+    conn_rec *c;
+    const char *name;
+
+    apr_pollfd_t *pfd;
+    apr_bucket_brigade *bb;
+
+    unsigned int down_in:1,
+                 down_out:1;
+};
+
+PROXY_DECLARE(apr_status_t) ap_proxy_tunnel_create(proxy_tunnel_rec **ptunnel,
+                                                   request_rec *r, conn_rec *c_o,
+                                                   const char *scheme)
+{
+    apr_status_t rv;
+    conn_rec *c_i = r->connection;
+    apr_interval_time_t timeout = -1;
+    proxy_tunnel_rec *tunnel;
+
+    *ptunnel = NULL;
+
+    tunnel = apr_pcalloc(r->pool, sizeof(*tunnel));
+
+    rv = apr_pollset_create(&tunnel->pollset, 2, r->pool, APR_POLLSET_NOCOPY);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    tunnel->r = r;
+    tunnel->scheme = apr_pstrdup(r->pool, scheme);
+    tunnel->client = apr_pcalloc(r->pool, sizeof(struct proxy_tunnel_conn));
+    tunnel->origin = apr_pcalloc(r->pool, sizeof(struct proxy_tunnel_conn));
+    tunnel->pfds = apr_array_make(r->pool, 2, sizeof(apr_pollfd_t));
+    tunnel->read_buf_size = ap_get_read_buf_size(r);
+    tunnel->client->other = tunnel->origin;
+    tunnel->origin->other = tunnel->client;
+    tunnel->timeout = -1;
+
+    tunnel->client->c = c_i;
+    tunnel->client->name = "client";
+    tunnel->client->bb = apr_brigade_create(c_i->pool, c_i->bucket_alloc);
+    tunnel->client->pfd = &APR_ARRAY_PUSH(tunnel->pfds, apr_pollfd_t);
+    tunnel->client->pfd->p = r->pool;
+    tunnel->client->pfd->desc_type = APR_POLL_SOCKET;
+    tunnel->client->pfd->desc.s = ap_get_conn_socket(c_i);
+    tunnel->client->pfd->client_data = tunnel->client;
+
+    tunnel->origin->c = c_o;
+    tunnel->origin->name = "origin";
+    tunnel->origin->bb = apr_brigade_create(c_o->pool, c_o->bucket_alloc);
+    tunnel->origin->pfd = &APR_ARRAY_PUSH(tunnel->pfds, apr_pollfd_t);
+    tunnel->origin->pfd->p = r->pool;
+    tunnel->origin->pfd->desc_type = APR_POLL_SOCKET;
+    tunnel->origin->pfd->desc.s = ap_get_conn_socket(c_o);
+    tunnel->origin->pfd->client_data = tunnel->origin;
+
+    /* Defaults to the biggest timeout of both connections */
+    apr_socket_timeout_get(tunnel->client->pfd->desc.s, &timeout);
+    apr_socket_timeout_get(tunnel->origin->pfd->desc.s, &tunnel->timeout);
+    if (timeout >= 0 && (tunnel->timeout < 0 || tunnel->timeout < timeout)) {
+        tunnel->timeout = timeout;
+    }
+
+    /* We should be nonblocking from now on the sockets */
+    apr_socket_opt_set(tunnel->client->pfd->desc.s, APR_SO_NONBLOCK, 1);
+    apr_socket_opt_set(tunnel->origin->pfd->desc.s, APR_SO_NONBLOCK, 1);
+
+    /* No coalescing filters */
+    ap_remove_output_filter_byhandle(c_i->output_filters,
+                                     "SSL/TLS Coalescing Filter");
+    ap_remove_output_filter_byhandle(c_o->output_filters,
+                                     "SSL/TLS Coalescing Filter");
+
+    /* Bidirectional non-HTTP stream will confuse mod_reqtimeoout */
+    ap_remove_input_filter_byhandle(c_i->input_filters, "reqtimeout");
+
+    /* The input/output filter stacks should contain connection filters only */
+    r->input_filters = r->proto_input_filters = c_i->input_filters;
+    r->output_filters = r->proto_output_filters = c_i->output_filters;
+
+    /* Won't be reused after tunneling */
+    c_i->keepalive = AP_CONN_CLOSE;
+    c_o->keepalive = AP_CONN_CLOSE;
+
+    /* Disable half-close forwarding for this request? */
+    if (apr_table_get(r->subprocess_env, "proxy-nohalfclose")) {
+        tunnel->nohalfclose = 1;
+    }
+
+    /* Start with POLLOUT and let ap_proxy_tunnel_run() schedule both
+     * directions when there are no output data pending (anymore).
+     */
+    tunnel->client->pfd->reqevents = APR_POLLOUT | APR_POLLERR;
+    tunnel->origin->pfd->reqevents = APR_POLLOUT | APR_POLLERR;
+    if ((rv = apr_pollset_add(tunnel->pollset, tunnel->client->pfd))
+            || (rv = apr_pollset_add(tunnel->pollset, tunnel->origin->pfd))) {
+        return rv;
+    }
+
+    *ptunnel = tunnel;
+    return APR_SUCCESS;
+}
+
+static void add_pollset(apr_pollset_t *pollset, apr_pollfd_t *pfd,
+                        apr_int16_t events)
+{
+    apr_status_t rv;
+
+    AP_DEBUG_ASSERT((pfd->reqevents & events) == 0);
+
+    if (pfd->reqevents) {
+        rv = apr_pollset_remove(pollset, pfd);
+        if (rv != APR_SUCCESS) {
+            AP_DEBUG_ASSERT(1);
+        }
+    }
+
+    if (events & APR_POLLIN) {
+        events |= APR_POLLHUP;
+    }
+    pfd->reqevents |= events | APR_POLLERR;
+    rv = apr_pollset_add(pollset, pfd);
+    if (rv != APR_SUCCESS) {
+        AP_DEBUG_ASSERT(1);
+    }
+}
+
+static void del_pollset(apr_pollset_t *pollset, apr_pollfd_t *pfd,
+                        apr_int16_t events)
+{
+    apr_status_t rv;
+
+    AP_DEBUG_ASSERT((pfd->reqevents & events) != 0);
+
+    rv = apr_pollset_remove(pollset, pfd);
+    if (rv != APR_SUCCESS) {
+        AP_DEBUG_ASSERT(0);
+        return;
+    }
+
+    if (events & APR_POLLIN) {
+        events |= APR_POLLHUP;
+    }
+    if (pfd->reqevents & ~(events | APR_POLLERR)) {
+        pfd->reqevents &= ~events;
+        rv = apr_pollset_add(pollset, pfd);
+        if (rv != APR_SUCCESS) {
+            AP_DEBUG_ASSERT(0);
+            return;
+        }
+    }
+    else {
+        pfd->reqevents = 0;
+    }
+}
+
+static int proxy_tunnel_forward(proxy_tunnel_rec *tunnel,
+                                 struct proxy_tunnel_conn *in)
+{
+    struct proxy_tunnel_conn *out = in->other;
+    apr_status_t rv;
+    int sent = 0;
+
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, tunnel->r,
+                  "proxy: %s: %s input ready",
+                  tunnel->scheme, in->name);
+
+    rv = ap_proxy_transfer_between_connections(tunnel->r,
+                                               in->c, out->c,
+                                               in->bb, out->bb,
+                                               in->name, &sent,
+                                               tunnel->read_buf_size,
+                                           AP_PROXY_TRANSFER_YIELD_PENDING |
+                                           AP_PROXY_TRANSFER_YIELD_MAX_READS);
+    if (sent && out == tunnel->client) {
+        tunnel->replied = 1;
+    }
+    if (rv != APR_SUCCESS) {
+        if (APR_STATUS_IS_INCOMPLETE(rv)) {
+            /* Pause POLLIN while waiting for POLLOUT on the other
+             * side, hence avoid filling the output filters even
+             * more to avoid blocking there.
+             */
+            ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, tunnel->r,
+                          "proxy: %s: %s wait writable",
+                          tunnel->scheme, out->name);
+        }
+        else if (APR_STATUS_IS_EOF(rv)) {
+            /* Stop POLLIN and wait for POLLOUT (flush) on the
+             * other side to shut it down.
+             */
+            ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, tunnel->r,
+                          "proxy: %s: %s read shutdown",
+                          tunnel->scheme, in->name);
+            if (tunnel->nohalfclose) {
+                /* No half-close forwarding, we are done both ways as
+                 * soon as one side shuts down.
+                 */
+                return DONE;
+            }
+            in->down_in = 1;
+        }
+        else {
+            /* Real failure, bail out */
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+
+        del_pollset(tunnel->pollset, in->pfd, APR_POLLIN);
+        add_pollset(tunnel->pollset, out->pfd, APR_POLLOUT);
+    }
+
+    return OK;
+}
+
+PROXY_DECLARE(int) ap_proxy_tunnel_run(proxy_tunnel_rec *tunnel)
+{
+    int status = OK, rc;
+    request_rec *r = tunnel->r;
+    apr_pollset_t *pollset = tunnel->pollset;
+    struct proxy_tunnel_conn *client = tunnel->client,
+                             *origin = tunnel->origin;
+    apr_interval_time_t timeout = tunnel->timeout >= 0 ? tunnel->timeout : -1;
+    const char *scheme = tunnel->scheme;
+    apr_status_t rv;
+
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(10212)
+                  "proxy: %s: tunnel running (timeout %lf)",
+                  scheme, timeout >= 0 ? (double)timeout / APR_USEC_PER_SEC
+                                       : (double)-1.0);
+
+    /* Loop until both directions of the connection are closed,
+     * or a failure occurs.
+     */
+    do {
+        const apr_pollfd_t *results;
+        apr_int32_t nresults, i;
+
+        ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r,
+                      "proxy: %s: polling (client=%hx, origin=%hx)",
+                      scheme, client->pfd->reqevents, origin->pfd->reqevents);
+        do {
+            rv = apr_pollset_poll(pollset, timeout, &nresults, &results);
+        } while (APR_STATUS_IS_EINTR(rv));
+
+        if (rv != APR_SUCCESS) {
+            if (APR_STATUS_IS_TIMEUP(rv)) {
+                ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, APLOGNO(10213)
+                              "proxy: %s: polling timed out "
+                              "(client=%hx, origin=%hx)",
+                              scheme, client->pfd->reqevents,
+                              origin->pfd->reqevents);
+                status = HTTP_GATEWAY_TIME_OUT;
+            }
+            else {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(10214)
+                              "proxy: %s: polling failed", scheme);
+                status = HTTP_INTERNAL_SERVER_ERROR;
+            }
+            goto done;
+        }
+
+        ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r, APLOGNO(10215)
+                      "proxy: %s: woken up, %i result(s)", scheme, nresults);
+
+        for (i = 0; i < nresults; i++) {
+            const apr_pollfd_t *pfd = &results[i];
+            struct proxy_tunnel_conn *tc = pfd->client_data;
+
+            ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r,
+                          "proxy: %s: #%i: %s: %hx/%hx", scheme, i,
+                          tc->name, pfd->rtnevents, tc->pfd->reqevents);
+
+            /* sanity check */
+            if (pfd->desc.s != client->pfd->desc.s
+                    && pfd->desc.s != origin->pfd->desc.s) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10222)
+                              "proxy: %s: unknown socket in pollset", scheme);
+                status = HTTP_INTERNAL_SERVER_ERROR;
+                goto done;
+            }
+
+            if (!(pfd->rtnevents & (APR_POLLIN  | APR_POLLOUT |
+                                    APR_POLLHUP | APR_POLLERR))) {
+                /* this catches POLLNVAL etc.. */
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10220)
+                              "proxy: %s: polling events error (%x)",
+                              scheme, pfd->rtnevents);
+                status = HTTP_INTERNAL_SERVER_ERROR;
+                goto done;
+            }
+
+            /* We want to write if we asked for POLLOUT and got:
+             * - POLLOUT: the socket is ready for write;
+             * - !POLLIN: the socket is in error state (POLLERR) so we let
+             *   the user know by failing the write and log, OR the socket
+             *   is shutdown for read already (POLLHUP) so we have to
+             *   shutdown for write.
+             */
+            if ((tc->pfd->reqevents & APR_POLLOUT)
+                    && ((pfd->rtnevents & APR_POLLOUT)
+                        || !(tc->pfd->reqevents & APR_POLLIN)
+                        || !(pfd->rtnevents & (APR_POLLIN | APR_POLLHUP)))) {
+                struct proxy_tunnel_conn *out = tc, *in = tc->other;
+
+                ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r,
+                              "proxy: %s: %s output ready",
+                              scheme, out->name);
+
+                rc = ap_filter_output_pending(out->c);
+                if (rc == OK) {
+                    /* Keep polling out (only) */
+                    continue;
+                }
+                if (rc != DECLINED) {
+                    /* Real failure, bail out */
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10221)
+                                  "proxy: %s: %s flushing failed (%i)",
+                                  scheme, out->name, rc);
+                    status = rc;
+                    goto done;
+                }
+
+                /* No more pending data. If the other side is not readable
+                 * anymore it's time to shutdown for write (this direction
+                 * is over). Otherwise back to normal business.
+                 */
+                del_pollset(pollset, out->pfd, APR_POLLOUT);
+                if (in->down_in) {
+                    ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r,
+                                  "proxy: %s: %s write shutdown",
+                                  scheme, out->name);
+                    apr_socket_shutdown(out->pfd->desc.s, 1);
+                    out->down_out = 1;
+                }
+                else {
+                    ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r,
+                                  "proxy: %s: %s resume writable",
+                                  scheme, out->name);
+                    add_pollset(pollset, in->pfd, APR_POLLIN);
+
+                    /* Flush any pending input data now, we don't know when
+                     * the next POLLIN will trigger and retaining data might
+                     * deadlock the underlying protocol. We don't check for
+                     * pending data first with ap_filter_input_pending() since
+                     * the read from proxy_tunnel_forward() is nonblocking
+                     * anyway and returning OK if there's no data.
+                     */
+                    rc = proxy_tunnel_forward(tunnel, in);
+                    if (rc != OK) {
+                        status = rc;
+                        goto done;
+                    }
+                }
+            }
+
+            /* We want to read if we asked for POLLIN|HUP and got:
+             * - POLLIN|HUP: the socket is ready for read or EOF (POLLHUP);
+             * - !POLLOUT: the socket is in error state (POLLERR) so we let
+             *   the user know by failing the read and log.
+             */
+            if ((tc->pfd->reqevents & APR_POLLIN)
+                    && ((pfd->rtnevents & (APR_POLLIN | APR_POLLHUP))
+                        || !(pfd->rtnevents & APR_POLLOUT))) {
+                rc = proxy_tunnel_forward(tunnel, tc);
+                if (rc != OK) {
+                    status = rc;
+                    goto done;
+                }
+            }
+        }
+    } while (!client->down_out || !origin->down_out);
+
+done:
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(10223)
+                  "proxy: %s: tunneling returns (%i)", scheme, status);
+    if (status == DONE) {
+        status = OK;
+    }
+    return status;
+}
+
+PROXY_DECLARE (const char *) ap_proxy_show_hcmethod(hcmethod_t method)
+{
+    proxy_hcmethods_t *m = proxy_hcmethods;
+    for (; m->name; m++) {
+        if (m->method == method) {
+            return m->name;
+        }
+    }
+    return "???";
+}
+
+void proxy_util_register_hooks(apr_pool_t *p)
+{
+    APR_REGISTER_OPTIONAL_FN(ap_proxy_retry_worker);
+    APR_REGISTER_OPTIONAL_FN(ap_proxy_clear_connection);
+    APR_REGISTER_OPTIONAL_FN(proxy_balancer_get_best_worker);
+}