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diff --git a/modules/http2/h2_switch.c b/modules/http2/h2_switch.c
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+/* 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.
+ */
+
+#include <assert.h>
+
+#include <apr_strings.h>
+#include <apr_optional.h>
+#include <apr_optional_hooks.h>
+
+#include <httpd.h>
+#include <http_core.h>
+#include <http_config.h>
+#include <http_connection.h>
+#include <http_protocol.h>
+#include <http_ssl.h>
+#include <http_log.h>
+
+#include "h2_private.h"
+#include "h2.h"
+
+#include "h2_config.h"
+#include "h2_conn_ctx.h"
+#include "h2_c1.h"
+#include "h2_c2.h"
+#include "h2_protocol.h"
+#include "h2_switch.h"
+
+/*******************************************************************************
+ * Once per lifetime init, retrieve optional functions
+ */
+apr_status_t h2_switch_init(apr_pool_t *pool, server_rec *s)
+{
+ (void)pool;
+ ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, s, "h2_switch init");
+
+ return APR_SUCCESS;
+}
+
+static int h2_protocol_propose(conn_rec *c, request_rec *r,
+ server_rec *s,
+ const apr_array_header_t *offers,
+ apr_array_header_t *proposals)
+{
+ int proposed = 0;
+ int is_tls = ap_ssl_conn_is_ssl(c);
+ const char **protos = is_tls? h2_protocol_ids_tls : h2_protocol_ids_clear;
+
+ if (!h2_mpm_supported()) {
+ return DECLINED;
+ }
+
+ if (strcmp(AP_PROTOCOL_HTTP1, ap_get_protocol(c))) {
+ /* We do not know how to switch from anything else but http/1.1.
+ */
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(03083)
+ "protocol switch: current proto != http/1.1, declined");
+ return DECLINED;
+ }
+
+ if (!h2_protocol_is_acceptable_c1(c, r, 0)) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(03084)
+ "protocol propose: connection requirements not met");
+ return DECLINED;
+ }
+
+ if (r) {
+ /* So far, this indicates an HTTP/1 Upgrade header initiated
+ * protocol switch. For that, the HTTP2-Settings header needs
+ * to be present and valid for the connection.
+ */
+ const char *p;
+
+ if (!h2_c1_can_upgrade(r)) {
+ return DECLINED;
+ }
+
+ p = apr_table_get(r->headers_in, "HTTP2-Settings");
+ if (!p) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03085)
+ "upgrade without HTTP2-Settings declined");
+ return DECLINED;
+ }
+
+ p = apr_table_get(r->headers_in, "Connection");
+ if (!ap_find_token(r->pool, p, "http2-settings")) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03086)
+ "upgrade without HTTP2-Settings declined");
+ return DECLINED;
+ }
+
+ /* We also allow switching only for requests that have no body.
+ */
+ p = apr_table_get(r->headers_in, "Content-Length");
+ if (p && strcmp(p, "0")) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03087)
+ "upgrade with content-length: %s, declined", p);
+ return DECLINED;
+ }
+ }
+
+ while (*protos) {
+ /* Add all protocols we know (tls or clear) and that
+ * are part of the offerings (if there have been any).
+ */
+ if (!offers || ap_array_str_contains(offers, *protos)) {
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
+ "proposing protocol '%s'", *protos);
+ APR_ARRAY_PUSH(proposals, const char*) = *protos;
+ proposed = 1;
+ }
+ ++protos;
+ }
+ return proposed? DECLINED : OK;
+}
+
+#if AP_HAS_RESPONSE_BUCKETS
+static void remove_output_filters_below(ap_filter_t *f, ap_filter_type ftype)
+{
+ ap_filter_t *fnext;
+
+ while (f && f->frec->ftype < ftype) {
+ fnext = f->next;
+ ap_remove_output_filter(f);
+ f = fnext;
+ }
+}
+
+static void remove_input_filters_below(ap_filter_t *f, ap_filter_type ftype)
+{
+ ap_filter_t *fnext;
+
+ while (f && f->frec->ftype < ftype) {
+ fnext = f->next;
+ ap_remove_input_filter(f);
+ f = fnext;
+ }
+}
+#endif
+
+static int h2_protocol_switch(conn_rec *c, request_rec *r, server_rec *s,
+ const char *protocol)
+{
+ int found = 0;
+ const char **protos = ap_ssl_conn_is_ssl(c)? h2_protocol_ids_tls : h2_protocol_ids_clear;
+ const char **p = protos;
+
+ (void)s;
+ if (!h2_mpm_supported()) {
+ return DECLINED;
+ }
+
+ while (*p) {
+ if (!strcmp(*p, protocol)) {
+ found = 1;
+ break;
+ }
+ p++;
+ }
+
+ if (found) {
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
+ "switching protocol to '%s'", protocol);
+ h2_conn_ctx_create_for_c1(c, s, protocol);
+
+ if (r != NULL) {
+ apr_status_t status;
+#if AP_HAS_RESPONSE_BUCKETS
+ /* Switching in the middle of a request means that
+ * we have to send out the response to this one in h2
+ * format. So we need to take over the connection
+ * and remove all old filters with type up to the
+ * CONNEDCTION/NETWORK ones.
+ */
+ remove_input_filters_below(r->input_filters, AP_FTYPE_CONNECTION);
+ remove_output_filters_below(r->output_filters, AP_FTYPE_CONNECTION);
+#else
+ /* Switching in the middle of a request means that
+ * we have to send out the response to this one in h2
+ * format. So we need to take over the connection
+ * right away.
+ */
+ ap_remove_input_filter_byhandle(r->input_filters, "http_in");
+ ap_remove_output_filter_byhandle(r->output_filters, "HTTP_HEADER");
+#endif
+ /* Ok, start an h2_conn on this one. */
+ status = h2_c1_setup(c, r, s);
+
+ if (status != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r, APLOGNO(03088)
+ "session setup");
+ h2_conn_ctx_detach(c);
+ return !OK;
+ }
+
+ h2_c1_run(c);
+ }
+ return OK;
+ }
+
+ return DECLINED;
+}
+
+static const char *h2_protocol_get(const conn_rec *c)
+{
+ h2_conn_ctx_t *ctx;
+
+ if (c->master) {
+ c = c->master;
+ }
+ ctx = h2_conn_ctx_get(c);
+ return ctx? ctx->protocol : NULL;
+}
+
+void h2_switch_register_hooks(void)
+{
+ ap_hook_protocol_propose(h2_protocol_propose, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_protocol_switch(h2_protocol_switch, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_protocol_get(h2_protocol_get, NULL, NULL, APR_HOOK_MIDDLE);
+}