Imported Upstream version 1.3.0+dfsgupstream/1.3.0+dfsg

1 files changed, 2494 insertions, 1962 deletions

diff --git a/src/web_client.c b/src/web_client.c
index 601dda08..4036d4c8 100644
--- a/src/web_client.c
+++ b/src/web_client.c
@@ -1,2032 +1,2537 @@
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-#include <unistd.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <errno.h>
-#include <pthread.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <netinet/tcp.h>
-#include <malloc.h>
-#include <pwd.h>
-#include <grp.h>
-#include <ctype.h>
-
 #include "common.h"
-#include "log.h"
-#include "appconfig.h"
-#include "url.h"
-#include "web_buffer.h"
-#include "web_server.h"
-#include "global_statistics.h"
-#include "rrd.h"
-#include "rrd2json.h"
-#include "registry.h"
-
-#include "web_client.h"
-#include "../config.h"
 
 #define INITIAL_WEB_DATA_LENGTH 16384
 #define WEB_REQUEST_LENGTH 16384
 #define TOO_BIG_REQUEST 16384
 
 int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
-int web_enable_gzip = 1;
+int web_donotrack_comply = 0;
 
-extern int netdata_exit;
+#ifdef NETDATA_WITH_ZLIB
+int web_enable_gzip = 1, web_gzip_level = 3, web_gzip_strategy = Z_DEFAULT_STRATEGY;
+#endif /* NETDATA_WITH_ZLIB */
 
 struct web_client *web_clients = NULL;
 unsigned long long web_clients_count = 0;
 
+inline int web_client_crock_socket(struct web_client *w) {
+#ifdef TCP_CORK
+    if(likely(!w->tcp_cork && w->ofd != -1)) {
+        w->tcp_cork = 1;
+        if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
+            error("%llu: failed to enable TCP_CORK on socket.", w->id);
+            w->tcp_cork = 0;
+            return -1;
+        }
+    }
+#endif /* TCP_CORK */
+
+    return 0;
+}
+
+inline int web_client_uncrock_socket(struct web_client *w) {
+#ifdef TCP_CORK
+    if(likely(w->tcp_cork && w->ofd != -1)) {
+        w->tcp_cork = 0;
+        if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
+            error("%llu: failed to disable TCP_CORK on socket.", w->id);
+            w->tcp_cork = 1;
+            return -1;
+        }
+    }
+#endif /* TCP_CORK */
+
+    return 0;
+}
+
 struct web_client *web_client_create(int listener)
 {
-	struct web_client *w;
-
-	w = calloc(1, sizeof(struct web_client));
-	if(!w) {
-		error("Cannot allocate new web_client memory.");
-		return NULL;
-	}
-
-	w->id = ++web_clients_count;
-	w->mode = WEB_CLIENT_MODE_NORMAL;
-
-	{
-		struct sockaddr *sadr;
-		socklen_t addrlen;
-
-		sadr = (struct sockaddr*) &w->clientaddr;
-		addrlen = sizeof(w->clientaddr);
-
-		w->ifd = accept(listener, sadr, &addrlen);
-		if (w->ifd == -1) {
-			error("%llu: Cannot accept new incoming connection.", w->id);
-			free(w);
-			return NULL;
-		}
-		w->ofd = w->ifd;
-
-		if(getnameinfo(sadr, addrlen, w->client_ip, NI_MAXHOST, w->client_port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
-			error("Cannot getnameinfo() on received client connection.");
-			strncpyz(w->client_ip,   "UNKNOWN", NI_MAXHOST);
-			strncpyz(w->client_port, "UNKNOWN", NI_MAXSERV);
-		}
-		w->client_ip[NI_MAXHOST]   = '\0';
-		w->client_port[NI_MAXSERV] = '\0';
-
-		switch(sadr->sa_family) {
-
-		case AF_INET:
-			debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv4 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
-			break;
-
-		case AF_INET6:
-			if(strncmp(w->client_ip, "::ffff:", 7) == 0) {
-				strcpy(w->client_ip, &w->client_ip[7]);
-				debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv4 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
-			}
-			debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv6 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
-			break;
-
-		default:
-			debug(D_WEB_CLIENT_ACCESS, "%llu: New UNKNOWN web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
-			break;
-		}
-
-		int flag = 1;
-		if(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0) error("%llu: Cannot set SO_KEEPALIVE on socket.", w->id);
-	}
-
-	w->response.data = buffer_create(INITIAL_WEB_DATA_LENGTH);
-	if(unlikely(!w->response.data)) {
-		// no need for error log - web_buffer_create already logged the error
-		close(w->ifd);
-		free(w);
-		return NULL;
-	}
-
-	w->response.header = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
-	if(unlikely(!w->response.header)) {
-		// no need for error log - web_buffer_create already logged the error
-		buffer_free(w->response.data);
-		close(w->ifd);
-		free(w);
-		return NULL;
-	}
-
-	w->response.header_output = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
-	if(unlikely(!w->response.header_output)) {
-		// no need for error log - web_buffer_create already logged the error
-		buffer_free(w->response.header);
-		buffer_free(w->response.data);
-		close(w->ifd);
-		free(w);
-		return NULL;
-	}
-
-	w->origin[0] = '*';
-	w->wait_receive = 1;
-
-	if(web_clients) web_clients->prev = w;
-	w->next = web_clients;
-	web_clients = w;
-
-	global_statistics.connected_clients++;
-
-	return(w);
+    struct web_client *w;
+
+    w = callocz(1, sizeof(struct web_client));
+    w->id = ++web_clients_count;
+    w->mode = WEB_CLIENT_MODE_NORMAL;
+
+    {
+        struct sockaddr *sadr;
+        socklen_t addrlen;
+
+        sadr = (struct sockaddr*) &w->clientaddr;
+        addrlen = sizeof(w->clientaddr);
+
+        w->ifd = accept4(listener, sadr, &addrlen, SOCK_NONBLOCK);
+        if (w->ifd == -1) {
+            error("%llu: Cannot accept new incoming connection.", w->id);
+            freez(w);
+            return NULL;
+        }
+        w->ofd = w->ifd;
+
+        if(getnameinfo(sadr, addrlen, w->client_ip, NI_MAXHOST, w->client_port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
+            error("Cannot getnameinfo() on received client connection.");
+            strncpyz(w->client_ip,   "UNKNOWN", NI_MAXHOST);
+            strncpyz(w->client_port, "UNKNOWN", NI_MAXSERV);
+        }
+        w->client_ip[NI_MAXHOST]   = '\0';
+        w->client_port[NI_MAXSERV] = '\0';
+
+        switch(sadr->sa_family) {
+        case AF_INET:
+            debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv4 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
+            break;
+
+        case AF_INET6:
+            if(strncmp(w->client_ip, "::ffff:", 7) == 0) {
+                memmove(w->client_ip, &w->client_ip[7], strlen(&w->client_ip[7]) + 1);
+                debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv4 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
+            }
+            else
+                debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv6 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
+            break;
+
+        default:
+            debug(D_WEB_CLIENT_ACCESS, "%llu: New UNKNOWN web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
+            break;
+        }
+
+        int flag = 1;
+        if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0)
+            error("%llu: failed to enable TCP_NODELAY on socket.", w->id);
+
+        flag = 1;
+        if(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0)
+            error("%llu: Cannot set SO_KEEPALIVE on socket.", w->id);
+    }
+
+    w->response.data = buffer_create(INITIAL_WEB_DATA_LENGTH);
+    w->response.header = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
+    w->response.header_output = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
+    w->origin[0] = '*';
+    w->wait_receive = 1;
+
+    if(web_clients) web_clients->prev = w;
+    w->next = web_clients;
+    web_clients = w;
+
+    web_client_connected();
+
+    return(w);
 }
 
-void web_client_reset(struct web_client *w)
-{
-	struct timeval tv;
-	gettimeofday(&tv, NULL);
+void web_client_reset(struct web_client *w) {
+    web_client_uncrock_socket(w);
+
+    debug(D_WEB_CLIENT, "%llu: Reseting client.", w->id);
 
-	long sent = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
+    if(likely(w->last_url[0])) {
+        struct timeval tv;
+        gettimeofday(&tv, NULL);
 
+        size_t size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
+        size_t sent = size;
 #ifdef NETDATA_WITH_ZLIB
-	if(likely(w->response.zoutput)) sent = (long)w->response.zstream.total_out;
+        if(likely(w->response.zoutput)) sent = (size_t)w->response.zstream.total_out;
 #endif
 
-	long size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
-
-	if(likely(w->last_url[0]))
-		log_access("%llu: (sent/all = %ld/%ld bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %s: %d '%s'",
-			w->id,
-			sent, size, -((size>0)?((float)(size-sent)/(float)size * 100.0):0.0),
-			(float)usecdiff(&w->tv_ready, &w->tv_in) / 1000.0,
-			(float)usecdiff(&tv, &w->tv_ready) / 1000.0,
-			(float)usecdiff(&tv, &w->tv_in) / 1000.0,
-			(w->mode == WEB_CLIENT_MODE_FILECOPY)?"filecopy":((w->mode == WEB_CLIENT_MODE_OPTIONS)?"options":"data"),
-			w->response.code,
-			w->last_url
-		);
-
-	debug(D_WEB_CLIENT, "%llu: Reseting client.", w->id);
-
-	if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
-		debug(D_WEB_CLIENT, "%llu: Closing filecopy input file.", w->id);
-		close(w->ifd);
-		w->ifd = w->ofd;
-	}
-
-	w->last_url[0] = '\0';
-	w->cookie1[0] = '\0';
-	w->cookie2[0] = '\0';
-	w->origin[0] = '*';
-	w->origin[1] = '\0';
-
-	w->mode = WEB_CLIENT_MODE_NORMAL;
-	w->enable_gzip = 0;
-	w->keepalive = 0;
-	if(w->decoded_url) {
-		free(w->decoded_url);
-		w->decoded_url = NULL;
-	}
-
-	buffer_reset(w->response.header_output);
-	buffer_reset(w->response.header);
-	buffer_reset(w->response.data);
-	w->response.rlen = 0;
-	w->response.sent = 0;
-	w->response.code = 0;
-
-	w->wait_receive = 1;
-	w->wait_send = 0;
-
-	w->response.zoutput = 0;
-
-	// if we had enabled compression, release it
+        // --------------------------------------------------------------------
+        // global statistics
+
+        finished_web_request_statistics(usec_dt(&tv, &w->tv_in),
+                                        w->stats_received_bytes,
+                                        w->stats_sent_bytes,
+                                        size,
+                                        sent);
+
+        w->stats_received_bytes = 0;
+        w->stats_sent_bytes = 0;
+
+
+        // --------------------------------------------------------------------
+        // access log
+
+        log_access("%llu: (sent/all = %zu/%zu bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %s: %d '%s'",
+                   w->id,
+                   sent, size, -((size > 0) ? ((size - sent) / (double) size * 100.0) : 0.0),
+                   usec_dt(&w->tv_ready, &w->tv_in) / 1000.0,
+                   usec_dt(&tv, &w->tv_ready) / 1000.0,
+                   usec_dt(&tv, &w->tv_in) / 1000.0,
+                   (w->mode == WEB_CLIENT_MODE_FILECOPY) ? "filecopy" : ((w->mode == WEB_CLIENT_MODE_OPTIONS)
+                                                                         ? "options" : "data"),
+                   w->response.code,
+                   w->last_url
+        );
+    }
+
+    if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
+        if(w->ifd != w->ofd) {
+            debug(D_WEB_CLIENT, "%llu: Closing filecopy input file descriptor %d.", w->id, w->ifd);
+            if(w->ifd != -1) close(w->ifd);
+            w->ifd = w->ofd;
+        }
+    }
+
+    w->last_url[0] = '\0';
+    w->cookie1[0] = '\0';
+    w->cookie2[0] = '\0';
+    w->origin[0] = '*';
+    w->origin[1] = '\0';
+
+    w->mode = WEB_CLIENT_MODE_NORMAL;
+
+    w->tcp_cork = 0;
+    w->donottrack = 0;
+    w->tracking_required = 0;
+    w->keepalive = 0;
+    w->decoded_url[0] = '\0';
+
+    buffer_reset(w->response.header_output);
+    buffer_reset(w->response.header);
+    buffer_reset(w->response.data);
+    w->response.rlen = 0;
+    w->response.sent = 0;
+    w->response.code = 0;
+
+    w->wait_receive = 1;
+    w->wait_send = 0;
+
+    w->response.zoutput = 0;
+
+    // if we had enabled compression, release it
 #ifdef NETDATA_WITH_ZLIB
-	if(w->response.zinitialized) {
-		debug(D_DEFLATE, "%llu: Reseting compression.", w->id);
-		deflateEnd(&w->response.zstream);
-		w->response.zsent = 0;
-		w->response.zhave = 0;
-		w->response.zstream.avail_in = 0;
-		w->response.zstream.avail_out = 0;
-		w->response.zstream.total_in = 0;
-		w->response.zstream.total_out = 0;
-		w->response.zinitialized = 0;
-	}
+    if(w->response.zinitialized) {
+        debug(D_DEFLATE, "%llu: Freeing compression resources.", w->id);
+        deflateEnd(&w->response.zstream);
+        w->response.zsent = 0;
+        w->response.zhave = 0;
+        w->response.zstream.avail_in = 0;
+        w->response.zstream.avail_out = 0;
+        w->response.zstream.total_in = 0;
+        w->response.zstream.total_out = 0;
+        w->response.zinitialized = 0;
+    }
 #endif // NETDATA_WITH_ZLIB
 }
 
-struct web_client *web_client_free(struct web_client *w)
-{
-	struct web_client *n = w->next;
-
-	debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
+struct web_client *web_client_free(struct web_client *w) {
+    web_client_reset(w);
 
-	if(w->prev)	w->prev->next = w->next;
-	if(w->next) w->next->prev = w->prev;
+    struct web_client *n = w->next;
+    if(w == web_clients) web_clients = n;
 
-	if(w == web_clients) web_clients = w->next;
+    debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
 
-	if(w->response.header_output) buffer_free(w->response.header_output);
-	if(w->response.header) buffer_free(w->response.header);
-	if(w->response.data) buffer_free(w->response.data);
-	close(w->ifd);
-	if(w->ofd != w->ifd) close(w->ofd);
-	free(w);
+    if(w->prev) w->prev->next = w->next;
+    if(w->next) w->next->prev = w->prev;
+    if(w->response.header_output) buffer_free(w->response.header_output);
+    if(w->response.header) buffer_free(w->response.header);
+    if(w->response.data) buffer_free(w->response.data);
+    if(w->ifd != -1) close(w->ifd);
+    if(w->ofd != -1 && w->ofd != w->ifd) close(w->ofd);
+    freez(w);
 
-	global_statistics.connected_clients--;
+    web_client_disconnected();
 
-	return(n);
+    return(n);
 }
 
-uid_t web_files_uid(void)
-{
-	static char *web_owner = NULL;
-	static uid_t owner_uid = 0;
-
-	if(unlikely(!web_owner)) {
-		web_owner = config_get("global", "web files owner", config_get("global", "run as user", ""));
-		if(!web_owner || !*web_owner)
-			owner_uid = geteuid();
-		else {
-			// getpwnam() is not thread safe,
-			// but we have called this function once
-			// while single threaded
-			struct passwd *pw = getpwnam(web_owner);
-			if(!pw) {
-				error("User %s is not present. Ignoring option.", web_owner);
-				owner_uid = geteuid();
-			}
-			else {
-				debug(D_WEB_CLIENT, "Web files owner set to %s.\n", web_owner);
-				owner_uid = pw->pw_uid;
-			}
-		}
-	}
-
-	return(owner_uid);
+uid_t web_files_uid(void) {
+    static char *web_owner = NULL;
+    static uid_t owner_uid = 0;
+
+    if(unlikely(!web_owner)) {
+        web_owner = config_get("global", "web files owner", config_get("global", "run as user", ""));
+        if(!web_owner || !*web_owner)
+            owner_uid = geteuid();
+        else {
+            // getpwnam() is not thread safe,
+            // but we have called this function once
+            // while single threaded
+            struct passwd *pw = getpwnam(web_owner);
+            if(!pw) {
+                error("User '%s' is not present. Ignoring option.", web_owner);
+                owner_uid = geteuid();
+            }
+            else {
+                debug(D_WEB_CLIENT, "Web files owner set to %s.", web_owner);
+                owner_uid = pw->pw_uid;
+            }
+        }
+    }
+
+    return(owner_uid);
 }
 
-gid_t web_files_gid(void)
-{
-	static char *web_group = NULL;
-	static gid_t owner_gid = 0;
-
-	if(unlikely(!web_group)) {
-		web_group = config_get("global", "web files group", config_get("global", "web files owner", ""));
-		if(!web_group || !*web_group)
-			owner_gid = getegid();
-		else {
-			// getgrnam() is not thread safe,
-			// but we have called this function once
-			// while single threaded
-			struct group *gr = getgrnam(web_group);
-			if(!gr) {
-				error("Group %s is not present. Ignoring option.", web_group);
-				owner_gid = getegid();
-			}
-			else {
-				debug(D_WEB_CLIENT, "Web files group set to %s.\n", web_group);
-				owner_gid = gr->gr_gid;
-			}
-		}
-	}
-
-	return(owner_gid);
+gid_t web_files_gid(void) {
+    static char *web_group = NULL;
+    static gid_t owner_gid = 0;
+
+    if(unlikely(!web_group)) {
+        web_group = config_get("global", "web files group", config_get("global", "web files owner", ""));
+        if(!web_group || !*web_group)
+            owner_gid = getegid();
+        else {
+            // getgrnam() is not thread safe,
+            // but we have called this function once
+            // while single threaded
+            struct group *gr = getgrnam(web_group);
+            if(!gr) {
+                error("Group '%s' is not present. Ignoring option.", web_group);
+                owner_gid = getegid();
+            }
+            else {
+                debug(D_WEB_CLIENT, "Web files group set to %s.", web_group);
+                owner_gid = gr->gr_gid;
+            }
+        }
+    }
+
+    return(owner_gid);
 }
 
 int mysendfile(struct web_client *w, char *filename)
 {
-	static char *web_dir = NULL;
-
-	// initialize our static data
-	if(unlikely(!web_dir)) web_dir = config_get("global", "web files directory", WEB_DIR);
-
-	debug(D_WEB_CLIENT, "%llu: Looking for file '%s/%s'", w->id, web_dir, filename);
-
-	// skip leading slashes
-	while (*filename == '/') filename++;
-
-	// if the filename contain known paths, skip them
-	if(strncmp(filename, WEB_PATH_FILE "/", strlen(WEB_PATH_FILE) + 1) == 0) filename = &filename[strlen(WEB_PATH_FILE) + 1];
-
-	char *s;
-	for(s = filename; *s ;s++) {
-		if( !isalnum(*s) && *s != '/' && *s != '.' && *s != '-' && *s != '_') {
-			debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
-			buffer_sprintf(w->response.data, "File '%s' cannot be served. Filename contains invalid character '%c'", filename, *s);
-			return 400;
-		}
-	}
-
-	// if the filename contains a .. refuse to serve it
-	if(strstr(filename, "..") != 0) {
-		debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
-		buffer_sprintf(w->response.data, "File '%s' cannot be served. Relative filenames with '..' in them are not supported.", filename);
-		return 400;
-	}
-
-	// access the file
-	char webfilename[FILENAME_MAX + 1];
-	snprintfz(webfilename, FILENAME_MAX, "%s/%s", web_dir, filename);
-
-	// check if the file exists
-	struct stat stat;
-	if(lstat(webfilename, &stat) != 0) {
-		debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not found.", w->id, webfilename);
-		buffer_sprintf(w->response.data, "File '%s' does not exist, or is not accessible.", webfilename);
-		return 404;
-	}
-
-	// check if the file is owned by expected user
-	if(stat.st_uid != web_files_uid()) {
-		error("%llu: File '%s' is owned by user %d (expected user %d). Access Denied.", w->id, webfilename, stat.st_uid, web_files_uid());
-		buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
-		return 403;
-	}
-
-	// check if the file is owned by expected group
-	if(stat.st_gid != web_files_gid()) {
-		error("%llu: File '%s' is owned by group %d (expected group %d). Access Denied.", w->id, webfilename, stat.st_gid, web_files_gid());
-		buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
-		return 403;
-	}
-
-	if((stat.st_mode & S_IFMT) == S_IFDIR) {
-		snprintfz(webfilename, FILENAME_MAX, "%s/index.html", filename);
-		return mysendfile(w, webfilename);
-	}
-
-	if((stat.st_mode & S_IFMT) != S_IFREG) {
-		error("%llu: File '%s' is not a regular file. Access Denied.", w->id, webfilename);
-		buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
-		return 403;
-	}
-
-	// open the file
-	w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
-	if(w->ifd == -1) {
-		w->ifd = w->ofd;
-
-		if(errno == EBUSY || errno == EAGAIN) {
-			error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
-			buffer_sprintf(w->response.header, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
-			buffer_sprintf(w->response.data, "The file '%s' is currently busy. Please try again later.", webfilename);
-			return 307;
-		}
-		else {
-			error("%llu: Cannot open file '%s'.", w->id, webfilename);
-			buffer_sprintf(w->response.data, "Cannot open file '%s'.", webfilename);
-			return 404;
-		}
-	}
-
-	// pick a Content-Type for the file
-		 if(strstr(filename, ".html") != NULL)	w->response.data->contenttype = CT_TEXT_HTML;
-	else if(strstr(filename, ".js")   != NULL)	w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
-	else if(strstr(filename, ".css")  != NULL)	w->response.data->contenttype = CT_TEXT_CSS;
-	else if(strstr(filename, ".xml")  != NULL)	w->response.data->contenttype = CT_TEXT_XML;
-	else if(strstr(filename, ".xsl")  != NULL)	w->response.data->contenttype = CT_TEXT_XSL;
-	else if(strstr(filename, ".txt")  != NULL)  w->response.data->contenttype = CT_TEXT_PLAIN;
-	else if(strstr(filename, ".svg")  != NULL)  w->response.data->contenttype = CT_IMAGE_SVG_XML;
-	else if(strstr(filename, ".ttf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_TRUETYPE;
-	else if(strstr(filename, ".otf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_OPENTYPE;
-	else if(strstr(filename, ".woff2")!= NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF2;
-	else if(strstr(filename, ".woff") != NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF;
-	else if(strstr(filename, ".eot")  != NULL)  w->response.data->contenttype = CT_APPLICATION_VND_MS_FONTOBJ;
-	else if(strstr(filename, ".png")  != NULL)  w->response.data->contenttype = CT_IMAGE_PNG;
-	else if(strstr(filename, ".jpg")  != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
-	else if(strstr(filename, ".jpeg") != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
-	else if(strstr(filename, ".gif")  != NULL)  w->response.data->contenttype = CT_IMAGE_GIF;
-	else if(strstr(filename, ".bmp")  != NULL)  w->response.data->contenttype = CT_IMAGE_BMP;
-	else if(strstr(filename, ".ico")  != NULL)  w->response.data->contenttype = CT_IMAGE_XICON;
-	else if(strstr(filename, ".icns") != NULL)  w->response.data->contenttype = CT_IMAGE_ICNS;
-	else w->response.data->contenttype = CT_APPLICATION_OCTET_STREAM;
-
-	debug(D_WEB_CLIENT_ACCESS, "%llu: Sending file '%s' (%ld bytes, ifd %d, ofd %d).", w->id, webfilename, stat.st_size, w->ifd, w->ofd);
-
-	w->mode = WEB_CLIENT_MODE_FILECOPY;
-	w->wait_receive = 1;
-	w->wait_send = 0;
-	buffer_flush(w->response.data);
-	w->response.rlen = stat.st_size;
-	w->response.data->date = stat.st_mtim.tv_sec;
-
-	return 200;
+    static char *web_dir = NULL;
+
+    // initialize our static data
+    if(unlikely(!web_dir)) web_dir = config_get("global", "web files directory", WEB_DIR);
+
+    debug(D_WEB_CLIENT, "%llu: Looking for file '%s/%s'", w->id, web_dir, filename);
+
+    // skip leading slashes
+    while (*filename == '/') filename++;
+
+    // if the filename contain known paths, skip them
+    if(strncmp(filename, WEB_PATH_FILE "/", strlen(WEB_PATH_FILE) + 1) == 0)
+        filename = &filename[strlen(WEB_PATH_FILE) + 1];
+
+    char *s;
+    for(s = filename; *s ;s++) {
+        if( !isalnum(*s) && *s != '/' && *s != '.' && *s != '-' && *s != '_') {
+            debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
+            buffer_sprintf(w->response.data, "File '%s' cannot be served. Filename contains invalid character '%c'", filename, *s);
+            return 400;
+        }
+    }
+
+    // if the filename contains a .. refuse to serve it
+    if(strstr(filename, "..") != 0) {
+        debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
+        buffer_sprintf(w->response.data, "File '%s' cannot be served. Relative filenames with '..' in them are not supported.", filename);
+        return 400;
+    }
+
+    // access the file
+    char webfilename[FILENAME_MAX + 1];
+    snprintfz(webfilename, FILENAME_MAX, "%s/%s", web_dir, filename);
+
+    // check if the file exists
+    struct stat stat;
+    if(lstat(webfilename, &stat) != 0) {
+        debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not found.", w->id, webfilename);
+        buffer_sprintf(w->response.data, "File '%s' does not exist, or is not accessible.", webfilename);
+        return 404;
+    }
+
+    // check if the file is owned by expected user
+    if(stat.st_uid != web_files_uid()) {
+        error("%llu: File '%s' is owned by user %u (expected user %u). Access Denied.", w->id, webfilename, stat.st_uid, web_files_uid());
+        buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
+        return 403;
+    }
+
+    // check if the file is owned by expected group
+    if(stat.st_gid != web_files_gid()) {
+        error("%llu: File '%s' is owned by group %u (expected group %u). Access Denied.", w->id, webfilename, stat.st_gid, web_files_gid());
+        buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
+        return 403;
+    }
+
+    if((stat.st_mode & S_IFMT) == S_IFDIR) {
+        snprintfz(webfilename, FILENAME_MAX, "%s/index.html", filename);
+        return mysendfile(w, webfilename);
+    }
+
+    if((stat.st_mode & S_IFMT) != S_IFREG) {
+        error("%llu: File '%s' is not a regular file. Access Denied.", w->id, webfilename);
+        buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
+        return 403;
+    }
+
+    // open the file
+    w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
+    if(w->ifd == -1) {
+        w->ifd = w->ofd;
+
+        if(errno == EBUSY || errno == EAGAIN) {
+            error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
+            buffer_sprintf(w->response.header, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
+            buffer_sprintf(w->response.data, "The file '%s' is currently busy. Please try again later.", webfilename);
+            return 307;
+        }
+        else {
+            error("%llu: Cannot open file '%s'.", w->id, webfilename);
+            buffer_sprintf(w->response.data, "Cannot open file '%s'.", webfilename);
+            return 404;
+        }
+    }
+    if(fcntl(w->ifd, F_SETFL, O_NONBLOCK) < 0)
+        error("%llu: Cannot set O_NONBLOCK on file '%s'.", w->id, webfilename);
+
+    // pick a Content-Type for the file
+         if(strstr(filename, ".html") != NULL)  w->response.data->contenttype = CT_TEXT_HTML;
+    else if(strstr(filename, ".js")   != NULL)  w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
+    else if(strstr(filename, ".css")  != NULL)  w->response.data->contenttype = CT_TEXT_CSS;
+    else if(strstr(filename, ".xml")  != NULL)  w->response.data->contenttype = CT_TEXT_XML;
+    else if(strstr(filename, ".xsl")  != NULL)  w->response.data->contenttype = CT_TEXT_XSL;
+    else if(strstr(filename, ".txt")  != NULL)  w->response.data->contenttype = CT_TEXT_PLAIN;
+    else if(strstr(filename, ".svg")  != NULL)  w->response.data->contenttype = CT_IMAGE_SVG_XML;
+    else if(strstr(filename, ".ttf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_TRUETYPE;
+    else if(strstr(filename, ".otf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_OPENTYPE;
+    else if(strstr(filename, ".woff2")!= NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF2;
+    else if(strstr(filename, ".woff") != NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF;
+    else if(strstr(filename, ".eot")  != NULL)  w->response.data->contenttype = CT_APPLICATION_VND_MS_FONTOBJ;
+    else if(strstr(filename, ".png")  != NULL)  w->response.data->contenttype = CT_IMAGE_PNG;
+    else if(strstr(filename, ".jpg")  != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
+    else if(strstr(filename, ".jpeg") != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
+    else if(strstr(filename, ".gif")  != NULL)  w->response.data->contenttype = CT_IMAGE_GIF;
+    else if(strstr(filename, ".bmp")  != NULL)  w->response.data->contenttype = CT_IMAGE_BMP;
+    else if(strstr(filename, ".ico")  != NULL)  w->response.data->contenttype = CT_IMAGE_XICON;
+    else if(strstr(filename, ".icns") != NULL)  w->response.data->contenttype = CT_IMAGE_ICNS;
+    else w->response.data->contenttype = CT_APPLICATION_OCTET_STREAM;
+
+    debug(D_WEB_CLIENT_ACCESS, "%llu: Sending file '%s' (%ld bytes, ifd %d, ofd %d).", w->id, webfilename, stat.st_size, w->ifd, w->ofd);
+
+    w->mode = WEB_CLIENT_MODE_FILECOPY;
+    w->wait_receive = 1;
+    w->wait_send = 0;
+    buffer_flush(w->response.data);
+    w->response.rlen = stat.st_size;
+    w->response.data->date = stat.st_mtim.tv_sec;
+
+    return 200;
 }
 
 
 #ifdef NETDATA_WITH_ZLIB
-void web_client_enable_deflate(struct web_client *w) {
-	if(w->response.zinitialized == 1) {
-		error("%llu: Compression has already be initialized for this client.", w->id);
-		return;
-	}
-
-	if(w->response.sent) {
-		error("%llu: Cannot enable compression in the middle of a conversation.", w->id);
-		return;
-	}
-
-	w->response.zstream.zalloc = Z_NULL;
-	w->response.zstream.zfree = Z_NULL;
-	w->response.zstream.opaque = Z_NULL;
-
-	w->response.zstream.next_in = (Bytef *)w->response.data->buffer;
-	w->response.zstream.avail_in = 0;
-	w->response.zstream.total_in = 0;
-
-	w->response.zstream.next_out = w->response.zbuffer;
-	w->response.zstream.avail_out = 0;
-	w->response.zstream.total_out = 0;
-
-	w->response.zstream.zalloc = Z_NULL;
-	w->response.zstream.zfree = Z_NULL;
-	w->response.zstream.opaque = Z_NULL;
-
-//	if(deflateInit(&w->response.zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
-//		error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
-//		return;
-//	}
-
-	// Select GZIP compression: windowbits = 15 + 16 = 31
-	if(deflateInit2(&w->response.zstream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 31, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
-		error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
-		return;
-	}
-
-	w->response.zsent = 0;
-	w->response.zoutput = 1;
-	w->response.zinitialized = 1;
-
-	debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
+void web_client_enable_deflate(struct web_client *w, int gzip) {
+    if(unlikely(w->response.zinitialized)) {
+        error("%llu: Compression has already be initialized for this client.", w->id);
+        return;
+    }
+
+    if(unlikely(w->response.sent)) {
+        error("%llu: Cannot enable compression in the middle of a conversation.", w->id);
+        return;
+    }
+
+    w->response.zstream.zalloc = Z_NULL;
+    w->response.zstream.zfree = Z_NULL;
+    w->response.zstream.opaque = Z_NULL;
+
+    w->response.zstream.next_in = (Bytef *)w->response.data->buffer;
+    w->response.zstream.avail_in = 0;
+    w->response.zstream.total_in = 0;
+
+    w->response.zstream.next_out = w->response.zbuffer;
+    w->response.zstream.avail_out = 0;
+    w->response.zstream.total_out = 0;
+
+    w->response.zstream.zalloc = Z_NULL;
+    w->response.zstream.zfree = Z_NULL;
+    w->response.zstream.opaque = Z_NULL;
+
+//  if(deflateInit(&w->response.zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
+//      error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
+//      return;
+//  }
+
+    // Select GZIP compression: windowbits = 15 + 16 = 31
+    if(deflateInit2(&w->response.zstream, web_gzip_level, Z_DEFLATED, 15 + ((gzip)?16:0), 8, web_gzip_strategy) != Z_OK) {
+        error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
+        return;
+    }
+
+    w->response.zsent = 0;
+    w->response.zoutput = 1;
+    w->response.zinitialized = 1;
+
+    debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
 }
 #endif // NETDATA_WITH_ZLIB
 
+void buffer_data_options2string(BUFFER *wb, uint32_t options) {
+    int count = 0;
+
+    if(options & RRDR_OPTION_NONZERO) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "nonzero");
+    }
+
+    if(options & RRDR_OPTION_REVERSED) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "flip");
+    }
+
+    if(options & RRDR_OPTION_JSON_WRAP) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "jsonwrap");
+    }
+
+    if(options & RRDR_OPTION_MIN2MAX) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "min2max");
+    }
+
+    if(options & RRDR_OPTION_MILLISECONDS) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "ms");
+    }
+
+    if(options & RRDR_OPTION_ABSOLUTE) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "abs");
+    }
+
+    if(options & RRDR_OPTION_SECONDS) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "seconds");
+    }
+
+    if(options & RRDR_OPTION_NULL2ZERO) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "null2zero");
+    }
+
+    if(options & RRDR_OPTION_OBJECTSROWS) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "objectrows");
+    }
+
+    if(options & RRDR_OPTION_GOOGLE_JSON) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "google_json");
+    }
+
+    if(options & RRDR_OPTION_PERCENTAGE) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "percentage");
+    }
+
+    if(options & RRDR_OPTION_NOT_ALIGNED) {
+        if(count++) buffer_strcat(wb, " ");
+        buffer_strcat(wb, "unaligned");
+    }
+}
+
 uint32_t web_client_api_request_v1_data_options(char *o)
 {
-	uint32_t ret = 0x00000000;
-	char *tok;
-
-	while(o && *o && (tok = mystrsep(&o, ", |"))) {
-		if(!*tok) continue;
-
-		if(!strcmp(tok, "nonzero"))
-			ret |= RRDR_OPTION_NONZERO;
-		else if(!strcmp(tok, "flip") || !strcmp(tok, "reversed") || !strcmp(tok, "reverse"))
-			ret |= RRDR_OPTION_REVERSED;
-		else if(!strcmp(tok, "jsonwrap"))
-			ret |= RRDR_OPTION_JSON_WRAP;
-		else if(!strcmp(tok, "min2max"))
-			ret |= RRDR_OPTION_MIN2MAX;
-		else if(!strcmp(tok, "ms") || !strcmp(tok, "milliseconds"))
-			ret |= RRDR_OPTION_MILLISECONDS;
-		else if(!strcmp(tok, "abs") || !strcmp(tok, "absolute") || !strcmp(tok, "absolute_sum") || !strcmp(tok, "absolute-sum"))
-			ret |= RRDR_OPTION_ABSOLUTE;
-		else if(!strcmp(tok, "seconds"))
-			ret |= RRDR_OPTION_SECONDS;
-		else if(!strcmp(tok, "null2zero"))
-			ret |= RRDR_OPTION_NULL2ZERO;
-		else if(!strcmp(tok, "objectrows"))
-			ret |= RRDR_OPTION_OBJECTSROWS;
-		else if(!strcmp(tok, "google_json"))
-			ret |= RRDR_OPTION_GOOGLE_JSON;
-		else if(!strcmp(tok, "percentage"))
-			ret |= RRDR_OPTION_PERCENTAGE;
-	}
-
-	return ret;
+    uint32_t ret = 0x00000000;
+    char *tok;
+
+    while(o && *o && (tok = mystrsep(&o, ", |"))) {
+        if(!*tok) continue;
+
+        if(!strcmp(tok, "nonzero"))
+            ret |= RRDR_OPTION_NONZERO;
+        else if(!strcmp(tok, "flip") || !strcmp(tok, "reversed") || !strcmp(tok, "reverse"))
+            ret |= RRDR_OPTION_REVERSED;
+        else if(!strcmp(tok, "jsonwrap"))
+            ret |= RRDR_OPTION_JSON_WRAP;
+        else if(!strcmp(tok, "min2max"))
+            ret |= RRDR_OPTION_MIN2MAX;
+        else if(!strcmp(tok, "ms") || !strcmp(tok, "milliseconds"))
+            ret |= RRDR_OPTION_MILLISECONDS;
+        else if(!strcmp(tok, "abs") || !strcmp(tok, "absolute") || !strcmp(tok, "absolute_sum") || !strcmp(tok, "absolute-sum"))
+            ret |= RRDR_OPTION_ABSOLUTE;
+        else if(!strcmp(tok, "seconds"))
+            ret |= RRDR_OPTION_SECONDS;
+        else if(!strcmp(tok, "null2zero"))
+            ret |= RRDR_OPTION_NULL2ZERO;
+        else if(!strcmp(tok, "objectrows"))
+            ret |= RRDR_OPTION_OBJECTSROWS;
+        else if(!strcmp(tok, "google_json"))
+            ret |= RRDR_OPTION_GOOGLE_JSON;
+        else if(!strcmp(tok, "percentage"))
+            ret |= RRDR_OPTION_PERCENTAGE;
+        else if(!strcmp(tok, "unaligned"))
+            ret |= RRDR_OPTION_NOT_ALIGNED;
+    }
+
+    return ret;
 }
 
 uint32_t web_client_api_request_v1_data_format(char *name)
 {
-	if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSON)) // datatable
-		return DATASOURCE_DATATABLE_JSON;
+    if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSON)) // datatable
+        return DATASOURCE_DATATABLE_JSON;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSONP)) // datasource
-		return DATASOURCE_DATATABLE_JSONP;
+    else if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSONP)) // datasource
+        return DATASOURCE_DATATABLE_JSONP;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_JSON)) // json
-		return DATASOURCE_JSON;
+    else if(!strcmp(name, DATASOURCE_FORMAT_JSON)) // json
+        return DATASOURCE_JSON;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_JSONP)) // jsonp
-		return DATASOURCE_JSONP;
+    else if(!strcmp(name, DATASOURCE_FORMAT_JSONP)) // jsonp
+        return DATASOURCE_JSONP;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_SSV)) // ssv
-		return DATASOURCE_SSV;
+    else if(!strcmp(name, DATASOURCE_FORMAT_SSV)) // ssv
+        return DATASOURCE_SSV;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_CSV)) // csv
-		return DATASOURCE_CSV;
+    else if(!strcmp(name, DATASOURCE_FORMAT_CSV)) // csv
+        return DATASOURCE_CSV;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_TSV) || !strcmp(name, "tsv-excel")) // tsv
-		return DATASOURCE_TSV;
+    else if(!strcmp(name, DATASOURCE_FORMAT_TSV) || !strcmp(name, "tsv-excel")) // tsv
+        return DATASOURCE_TSV;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_HTML)) // html
-		return DATASOURCE_HTML;
+    else if(!strcmp(name, DATASOURCE_FORMAT_HTML)) // html
+        return DATASOURCE_HTML;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_JS_ARRAY)) // array
-		return DATASOURCE_JS_ARRAY;
+    else if(!strcmp(name, DATASOURCE_FORMAT_JS_ARRAY)) // array
+        return DATASOURCE_JS_ARRAY;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_SSV_COMMA)) // ssvcomma
-		return DATASOURCE_SSV_COMMA;
+    else if(!strcmp(name, DATASOURCE_FORMAT_SSV_COMMA)) // ssvcomma
+        return DATASOURCE_SSV_COMMA;
 
-	else if(!strcmp(name, DATASOURCE_FORMAT_CSV_JSON_ARRAY)) // csvjsonarray
-		return DATASOURCE_CSV_JSON_ARRAY;
+    else if(!strcmp(name, DATASOURCE_FORMAT_CSV_JSON_ARRAY)) // csvjsonarray
+        return DATASOURCE_CSV_JSON_ARRAY;
 
-	return DATASOURCE_JSON;
+    return DATASOURCE_JSON;
 }
 
 uint32_t web_client_api_request_v1_data_google_format(char *name)
 {
-	if(!strcmp(name, "json"))
-		return DATASOURCE_DATATABLE_JSONP;
+    if(!strcmp(name, "json"))
+        return DATASOURCE_DATATABLE_JSONP;
 
-	else if(!strcmp(name, "html"))
-		return DATASOURCE_HTML;
+    else if(!strcmp(name, "html"))
+        return DATASOURCE_HTML;
 
-	else if(!strcmp(name, "csv"))
-		return DATASOURCE_CSV;
+    else if(!strcmp(name, "csv"))
+        return DATASOURCE_CSV;
 
-	else if(!strcmp(name, "tsv-excel"))
-		return DATASOURCE_TSV;
+    else if(!strcmp(name, "tsv-excel"))
+        return DATASOURCE_TSV;
 
-	return DATASOURCE_JSON;
+    return DATASOURCE_JSON;
 }
 
-int web_client_api_request_v1_data_group(char *name)
+const char *group_method2string(int group) {
+    switch(group) {
+        case GROUP_UNDEFINED:
+            return "";
+
+        case GROUP_AVERAGE:
+            return "average";
+
+        case GROUP_MIN:
+            return "min";
+
+        case GROUP_MAX:
+            return "max";
+
+        case GROUP_SUM:
+            return "sum";
+
+        case GROUP_INCREMENTAL_SUM:
+            return "incremental-sum";
+
+        default:
+            return "unknown-group-method";
+    }
+}
+
+int web_client_api_request_v1_data_group(char *name, int def)
 {
-	if(!strcmp(name, "max"))
-		return GROUP_MAX;
+    if(!strcmp(name, "average"))
+        return GROUP_AVERAGE;
+
+    else if(!strcmp(name, "min"))
+        return GROUP_MIN;
+
+    else if(!strcmp(name, "max"))
+        return GROUP_MAX;
+
+    else if(!strcmp(name, "sum"))
+        return GROUP_SUM;
 
-	else if(!strcmp(name, "average"))
-		return GROUP_AVERAGE;
+    else if(!strcmp(name, "incremental-sum"))
+        return GROUP_INCREMENTAL_SUM;
 
-	return GROUP_MAX;
+    return def;
+}
+
+int web_client_api_request_v1_alarms(struct web_client *w, char *url)
+{
+    int all = 0;
+
+    while(url) {
+        char *value = mystrsep(&url, "?&[]");
+        if (!value || !*value) continue;
+
+        if(!strcmp(value, "all")) all = 1;
+        else if(!strcmp(value, "active")) all = 0;
+    }
+
+    buffer_flush(w->response.data);
+    w->response.data->contenttype = CT_APPLICATION_JSON;
+    health_alarms2json(&localhost, w->response.data, all);
+    return 200;
+}
+
+int web_client_api_request_v1_alarm_log(struct web_client *w, char *url)
+{
+    (void)url;
+
+    buffer_flush(w->response.data);
+    w->response.data->contenttype = CT_APPLICATION_JSON;
+    health_alarm_log2json(&localhost, w->response.data);
+    return 200;
 }
 
 int web_client_api_request_v1_charts(struct web_client *w, char *url)
 {
-	if(url) { ; }
+    if(url) { ; }
 
-	buffer_flush(w->response.data);
-	w->response.data->contenttype = CT_APPLICATION_JSON;
-	rrd_stats_api_v1_charts(w->response.data);
-	return 200;
+    buffer_flush(w->response.data);
+    w->response.data->contenttype = CT_APPLICATION_JSON;
+    rrd_stats_api_v1_charts(w->response.data);
+    return 200;
 }
 
 int web_client_api_request_v1_chart(struct web_client *w, char *url)
 {
-	int ret = 400;
-	char *chart = NULL;
-
-	buffer_flush(w->response.data);
-
-	while(url) {
-		char *value = mystrsep(&url, "?&[]");
-		if(!value || !*value) continue;
-
-		char *name = mystrsep(&value, "=");
-		if(!name || !*name) continue;
-		if(!value || !*value) continue;
-
-		// name and value are now the parameters
-		// they are not null and not empty
-
-		if(!strcmp(name, "chart")) chart = value;
-		//else {
-		///	buffer_sprintf(w->response.data, "Unknown parameter '%s' in request.", name);
-		//	goto cleanup;
-		//}
-	}
-
-	if(!chart || !*chart) {
-		buffer_sprintf(w->response.data, "No chart id is given at the request.");
-		goto cleanup;
-	}
-
-	RRDSET *st = rrdset_find(chart);
-	if(!st) st = rrdset_find_byname(chart);
-	if(!st) {
-		buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
-		ret = 404;
-		goto cleanup;
-	}
-
-	w->response.data->contenttype = CT_APPLICATION_JSON;
-	rrd_stats_api_v1_chart(st, w->response.data);
-	return 200;
+    int ret = 400;
+    char *chart = NULL;
+
+    buffer_flush(w->response.data);
+
+    while(url) {
+        char *value = mystrsep(&url, "?&[]");
+        if(!value || !*value) continue;
+
+        char *name = mystrsep(&value, "=");
+        if(!name || !*name) continue;
+        if(!value || !*value) continue;
+
+        // name and value are now the parameters
+        // they are not null and not empty
+
+        if(!strcmp(name, "chart")) chart = value;
+        //else {
+        /// buffer_sprintf(w->response.data, "Unknown parameter '%s' in request.", name);
+        //  goto cleanup;
+        //}
+    }
+
+    if(!chart || !*chart) {
+        buffer_sprintf(w->response.data, "No chart id is given at the request.");
+        goto cleanup;
+    }
+
+    RRDSET *st = rrdset_find(chart);
+    if(!st) st = rrdset_find_byname(chart);
+    if(!st) {
+        buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
+        ret = 404;
+        goto cleanup;
+    }
+
+    w->response.data->contenttype = CT_APPLICATION_JSON;
+    rrd_stats_api_v1_chart(st, w->response.data);
+    return 200;
 
 cleanup:
-	return ret;
+    return ret;
+}
+
+int web_client_api_request_v1_badge(struct web_client *w, char *url) {
+    int ret = 400;
+    buffer_flush(w->response.data);
+
+    BUFFER *dimensions = NULL;
+    
+    const char *chart = NULL
+            , *before_str = NULL
+            , *after_str = NULL
+            , *points_str = NULL
+            , *multiply_str = NULL
+            , *divide_str = NULL
+            , *label = NULL
+            , *units = NULL
+            , *label_color = NULL
+            , *value_color = NULL
+            , *refresh_str = NULL
+            , *precision_str = NULL
+            , *alarm = NULL;
+
+    int group = GROUP_AVERAGE;
+    uint32_t options = 0x00000000;
+
+    while(url) {
+        char *value = mystrsep(&url, "/?&[]");
+        if(!value || !*value) continue;
+
+        char *name = mystrsep(&value, "=");
+        if(!name || !*name) continue;
+        if(!value || !*value) continue;
+
+        debug(D_WEB_CLIENT, "%llu: API v1 badge.svg query param '%s' with value '%s'", w->id, name, value);
+
+        // name and value are now the parameters
+        // they are not null and not empty
+
+        if(!strcmp(name, "chart")) chart = value;
+        else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
+            if(!dimensions)
+                dimensions = buffer_create(100);
+
+            buffer_strcat(dimensions, "|");
+            buffer_strcat(dimensions, value);
+        }
+        else if(!strcmp(name, "after")) after_str = value;
+        else if(!strcmp(name, "before")) before_str = value;
+        else if(!strcmp(name, "points")) points_str = value;
+        else if(!strcmp(name, "group")) {
+            group = web_client_api_request_v1_data_group(value, GROUP_AVERAGE);
+        }
+        else if(!strcmp(name, "options")) {
+            options |= web_client_api_request_v1_data_options(value);
+        }
+        else if(!strcmp(name, "label")) label = value;
+        else if(!strcmp(name, "units")) units = value;
+        else if(!strcmp(name, "label_color")) label_color = value;
+        else if(!strcmp(name, "value_color")) value_color = value;
+        else if(!strcmp(name, "multiply")) multiply_str = value;
+        else if(!strcmp(name, "divide")) divide_str = value;
+        else if(!strcmp(name, "refresh")) refresh_str = value;
+        else if(!strcmp(name, "precision")) precision_str = value;
+        else if(!strcmp(name, "alarm")) alarm = value;
+    }
+
+    if(!chart || !*chart) {
+        buffer_sprintf(w->response.data, "No chart id is given at the request.");
+        goto cleanup;
+    }
+
+    RRDSET *st = rrdset_find(chart);
+    if(!st) st = rrdset_find_byname(chart);
+    if(!st) {
+        buffer_svg(w->response.data, "chart not found", 0, "", NULL, NULL, 1, -1);
+        ret = 200;
+        goto cleanup;
+    }
+
+    RRDCALC *rc = NULL;
+    if(alarm) {
+        rc = rrdcalc_find(st, alarm);
+        if (!rc) {
+            buffer_svg(w->response.data, "alarm not found", 0, "", NULL, NULL, 1, -1);
+            ret = 200;
+            goto cleanup;
+        }
+    }
+
+    long long multiply  = (multiply_str  && *multiply_str )?atol(multiply_str):1;
+    long long divide    = (divide_str    && *divide_str   )?atol(divide_str):1;
+    long long before    = (before_str    && *before_str   )?atol(before_str):0;
+    long long after     = (after_str     && *after_str    )?atol(after_str):-st->update_every;
+    int       points    = (points_str    && *points_str   )?atoi(points_str):1;
+    int       precision = (precision_str && *precision_str)?atoi(precision_str):-1;
+
+    if(!multiply) multiply = 1;
+    if(!divide) divide = 1;
+
+    int refresh = 0;
+    if(refresh_str && *refresh_str) {
+        if(!strcmp(refresh_str, "auto")) {
+            if(rc) refresh = rc->update_every;
+            else if(options & RRDR_OPTION_NOT_ALIGNED)
+                refresh = st->update_every;
+            else {
+                refresh = (before - after);
+                if(refresh < 0) refresh = -refresh;
+            }
+        }
+        else {
+            refresh = atoi(refresh_str);
+            if(refresh < 0) refresh = -refresh;
+        }
+    }
+
+    if(!label) {
+        if(alarm) {
+            char *s = (char *)alarm;
+            while(*s) {
+                if(*s == '_') *s = ' ';
+                s++;
+            }
+            label = alarm;
+        }
+        else if(dimensions) {
+            const char *dim = buffer_tostring(dimensions);
+            if(*dim == '|') dim++;
+            label = dim;
+        }
+        else
+            label = st->name;
+    }
+    if(!units) {
+        if(alarm) {
+            if(rc->units)
+                units = rc->units;
+            else
+                units = "";
+        }
+        else if(options & RRDR_OPTION_PERCENTAGE)
+            units = "%";
+        else
+            units = st->units;
+    }
+
+    debug(D_WEB_CLIENT, "%llu: API command 'badge.svg' for chart '%s', alarm '%s', dimensions '%s', after '%lld', before '%lld', points '%d', group '%d', options '0x%08x'"
+            , w->id
+            , chart
+            , alarm?alarm:""
+            , (dimensions)?buffer_tostring(dimensions):""
+            , after
+            , before
+            , points
+            , group
+            , options
+            );
+
+    if(rc) {
+        calculated_number n = rc->value;
+        if(isnan(n) || isinf(n)) n = 0;
+
+        if (refresh > 0)
+            buffer_sprintf(w->response.header, "Refresh: %d\r\n", refresh);
+
+        if(!value_color) {
+            switch(rc->status) {
+                case RRDCALC_STATUS_CRITICAL:
+                    value_color = "red";
+                    break;
+
+                case RRDCALC_STATUS_WARNING:
+                    value_color = "orange";
+                    break;
+
+                case RRDCALC_STATUS_CLEAR:
+                    value_color = "brightgreen";
+                    break;
+
+                case RRDCALC_STATUS_UNDEFINED:
+                    value_color = "lightgrey";
+                    break;
+
+                case RRDCALC_STATUS_UNINITIALIZED:
+                    value_color = "#000";
+                    break;
+
+                default:
+                    value_color = "grey";
+                    break;
+            }
+        }
+
+        buffer_svg(w->response.data, label, rc->value * multiply / divide, units, label_color, value_color, 0, precision);
+        ret = 200;
+    }
+    else {
+        time_t latest_timestamp = 0;
+        int value_is_null = 1;
+        calculated_number n = 0;
+        ret = 500;
+
+        // if the collected value is too old, don't calculate its value
+        if (rrdset_last_entry_t(st) >= (time(NULL) - (st->update_every * st->gap_when_lost_iterations_above)))
+            ret = rrd2value(st, w->response.data, &n, (dimensions) ? buffer_tostring(dimensions) : NULL, points, after,
+                            before, group, options, NULL, &latest_timestamp, &value_is_null);
+
+        // if the value cannot be calculated, show empty badge
+        if (ret != 200) {
+            value_is_null = 1;
+            n = 0;
+            ret = 200;
+        }
+        else if (refresh > 0)
+            buffer_sprintf(w->response.header, "Refresh: %d\r\n", refresh);
+
+        // render the badge
+        buffer_svg(w->response.data, label, n * multiply / divide, units, label_color, value_color, value_is_null,
+                   precision);
+    }
+
+cleanup:
+    if(dimensions)
+        buffer_free(dimensions);
+    return ret;
 }
 
 // returns the HTTP code
 int web_client_api_request_v1_data(struct web_client *w, char *url)
 {
-	debug(D_WEB_CLIENT, "%llu: API v1 data with URL '%s'", w->id, url);
-
-	int ret = 400;
-	BUFFER *dimensions = NULL;
-
-	buffer_flush(w->response.data);
-
-	char 	*google_version = "0.6",
-			*google_reqId = "0",
-			*google_sig = "0",
-			*google_out = "json",
-			*responseHandler = NULL,
-			*outFileName = NULL;
-
-	time_t last_timestamp_in_data = 0, google_timestamp = 0;
-
-	char *chart = NULL
-			, *before_str = NULL
-			, *after_str = NULL
-			, *points_str = NULL;
-
-	int group = GROUP_MAX;
-	uint32_t format = DATASOURCE_JSON;
-	uint32_t options = 0x00000000;
-
-	while(url) {
-		char *value = mystrsep(&url, "?&[]");
-		if(!value || !*value) continue;
-
-		char *name = mystrsep(&value, "=");
-		if(!name || !*name) continue;
-		if(!value || !*value) continue;
-
-		debug(D_WEB_CLIENT, "%llu: API v1 data query param '%s' with value '%s'", w->id, name, value);
-
-		// name and value are now the parameters
-		// they are not null and not empty
-
-		if(!strcmp(name, "chart")) chart = value;
-		else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
-			if(!dimensions) dimensions = buffer_create(strlen(value));
-			if(dimensions) {
-				buffer_strcat(dimensions, "|");
-				buffer_strcat(dimensions, value);
-			}
-		}
-		else if(!strcmp(name, "after")) after_str = value;
-		else if(!strcmp(name, "before")) before_str = value;
-		else if(!strcmp(name, "points")) points_str = value;
-		else if(!strcmp(name, "group")) {
-			group = web_client_api_request_v1_data_group(value);
-		}
-		else if(!strcmp(name, "format")) {
-			format = web_client_api_request_v1_data_format(value);
-		}
-		else if(!strcmp(name, "options")) {
-			options |= web_client_api_request_v1_data_options(value);
-		}
-		else if(!strcmp(name, "callback")) {
-			responseHandler = value;
-		}
-		else if(!strcmp(name, "filename")) {
-			outFileName = value;
-		}
-		else if(!strcmp(name, "tqx")) {
-			// parse Google Visualization API options
-			// https://developers.google.com/chart/interactive/docs/dev/implementing_data_source
-			char *tqx_name, *tqx_value;
-
-			while(value) {
-				tqx_value = mystrsep(&value, ";");
-				if(!tqx_value || !*tqx_value) continue;
-
-				tqx_name = mystrsep(&tqx_value, ":");
-				if(!tqx_name || !*tqx_name) continue;
-				if(!tqx_value || !*tqx_value) continue;
-
-				if(!strcmp(tqx_name, "version"))
-					google_version = tqx_value;
-				else if(!strcmp(tqx_name, "reqId"))
-					google_reqId = tqx_value;
-				else if(!strcmp(tqx_name, "sig")) {
-					google_sig = tqx_value;
-					google_timestamp = strtoul(google_sig, NULL, 0);
-				}
-				else if(!strcmp(tqx_name, "out")) {
-					google_out = tqx_value;
-					format = web_client_api_request_v1_data_google_format(google_out);
-				}
-				else if(!strcmp(tqx_name, "responseHandler"))
-					responseHandler = tqx_value;
-				else if(!strcmp(tqx_name, "outFileName"))
-					outFileName = tqx_value;
-			}
-		}
-	}
-
-	if(!chart || !*chart) {
-		buffer_sprintf(w->response.data, "No chart id is given at the request.");
-		goto cleanup;
-	}
-
-	RRDSET *st = rrdset_find(chart);
-	if(!st) st = rrdset_find_byname(chart);
-	if(!st) {
-		buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
-		ret = 404;
-		goto cleanup;
-	}
-
-	long long before = (before_str && *before_str)?atol(before_str):0;
-	long long after  = (after_str  && *after_str) ?atol(after_str):0;
-	int       points = (points_str && *points_str)?atoi(points_str):0;
-
-	debug(D_WEB_CLIENT, "%llu: API command 'data' for chart '%s', dimensions '%s', after '%lld', before '%lld', points '%d', group '%u', format '%u', options '0x%08x'"
-			, w->id
-			, chart
-			, (dimensions)?buffer_tostring(dimensions):""
-			, after
-			, before
-			, points
-			, group
-			, format
-			, options
-			);
-
-	if(outFileName && *outFileName) {
-		buffer_sprintf(w->response.header, "Content-Disposition: attachment; filename=\"%s\"\r\n", outFileName);
-		error("generating outfilename header: '%s'", outFileName);
-	}
-
-	if(format == DATASOURCE_DATATABLE_JSONP) {
-		if(responseHandler == NULL)
-			responseHandler = "google.visualization.Query.setResponse";
-
-		debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSON/JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
-				w->id, google_version, google_reqId, google_sig, google_out, responseHandler, outFileName
-			);
-
-		buffer_sprintf(w->response.data,
-			"%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
-			responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
-	}
-	else if(format == DATASOURCE_JSONP) {
-		if(responseHandler == NULL)
-			responseHandler = "callback";
-
-		buffer_strcat(w->response.data, responseHandler);
-		buffer_strcat(w->response.data, "(");
-	}
-
-	ret = rrd2format(st, w->response.data, dimensions, format, points, after, before, group, options, &last_timestamp_in_data);
-
-	if(format == DATASOURCE_DATATABLE_JSONP) {
-		if(google_timestamp < last_timestamp_in_data)
-			buffer_strcat(w->response.data, "});");
-
-		else {
-			// the client already has the latest data
-			buffer_flush(w->response.data);
-			buffer_sprintf(w->response.data,
-				"%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
-				responseHandler, google_version, google_reqId);
-		}
-	}
-	else if(format == DATASOURCE_JSONP)
-		buffer_strcat(w->response.data, ");");
+    debug(D_WEB_CLIENT, "%llu: API v1 data with URL '%s'", w->id, url);
+
+    int ret = 400;
+    BUFFER *dimensions = NULL;
+
+    buffer_flush(w->response.data);
+
+    char    *google_version = "0.6",
+            *google_reqId = "0",
+            *google_sig = "0",
+            *google_out = "json",
+            *responseHandler = NULL,
+            *outFileName = NULL;
+
+    time_t last_timestamp_in_data = 0, google_timestamp = 0;
+
+    char *chart = NULL
+            , *before_str = NULL
+            , *after_str = NULL
+            , *points_str = NULL;
+
+    int group = GROUP_AVERAGE;
+    uint32_t format = DATASOURCE_JSON;
+    uint32_t options = 0x00000000;
+
+    while(url) {
+        char *value = mystrsep(&url, "?&[]");
+        if(!value || !*value) continue;
+
+        char *name = mystrsep(&value, "=");
+        if(!name || !*name) continue;
+        if(!value || !*value) continue;
+
+        debug(D_WEB_CLIENT, "%llu: API v1 data query param '%s' with value '%s'", w->id, name, value);
+
+        // name and value are now the parameters
+        // they are not null and not empty
+
+        if(!strcmp(name, "chart")) chart = value;
+        else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
+            if(!dimensions) dimensions = buffer_create(100);
+            buffer_strcat(dimensions, "|");
+            buffer_strcat(dimensions, value);
+        }
+        else if(!strcmp(name, "after")) after_str = value;
+        else if(!strcmp(name, "before")) before_str = value;
+        else if(!strcmp(name, "points")) points_str = value;
+        else if(!strcmp(name, "group")) {
+            group = web_client_api_request_v1_data_group(value, GROUP_AVERAGE);
+        }
+        else if(!strcmp(name, "format")) {
+            format = web_client_api_request_v1_data_format(value);
+        }
+        else if(!strcmp(name, "options")) {
+            options |= web_client_api_request_v1_data_options(value);
+        }
+        else if(!strcmp(name, "callback")) {
+            responseHandler = value;
+        }
+        else if(!strcmp(name, "filename")) {
+            outFileName = value;
+        }
+        else if(!strcmp(name, "tqx")) {
+            // parse Google Visualization API options
+            // https://developers.google.com/chart/interactive/docs/dev/implementing_data_source
+            char *tqx_name, *tqx_value;
+
+            while(value) {
+                tqx_value = mystrsep(&value, ";");
+                if(!tqx_value || !*tqx_value) continue;
+
+                tqx_name = mystrsep(&tqx_value, ":");
+                if(!tqx_name || !*tqx_name) continue;
+                if(!tqx_value || !*tqx_value) continue;
+
+                if(!strcmp(tqx_name, "version"))
+                    google_version = tqx_value;
+                else if(!strcmp(tqx_name, "reqId"))
+                    google_reqId = tqx_value;
+                else if(!strcmp(tqx_name, "sig")) {
+                    google_sig = tqx_value;
+                    google_timestamp = strtoul(google_sig, NULL, 0);
+                }
+                else if(!strcmp(tqx_name, "out")) {
+                    google_out = tqx_value;
+                    format = web_client_api_request_v1_data_google_format(google_out);
+                }
+                else if(!strcmp(tqx_name, "responseHandler"))
+                    responseHandler = tqx_value;
+                else if(!strcmp(tqx_name, "outFileName"))
+                    outFileName = tqx_value;
+            }
+        }
+    }
+
+    if(!chart || !*chart) {
+        buffer_sprintf(w->response.data, "No chart id is given at the request.");
+        goto cleanup;
+    }
+
+    RRDSET *st = rrdset_find(chart);
+    if(!st) st = rrdset_find_byname(chart);
+    if(!st) {
+        buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
+        ret = 404;
+        goto cleanup;
+    }
+
+    long long before = (before_str && *before_str)?atol(before_str):0;
+    long long after  = (after_str  && *after_str) ?atol(after_str):0;
+    int       points = (points_str && *points_str)?atoi(points_str):0;
+
+    debug(D_WEB_CLIENT, "%llu: API command 'data' for chart '%s', dimensions '%s', after '%lld', before '%lld', points '%d', group '%d', format '%u', options '0x%08x'"
+            , w->id
+            , chart
+            , (dimensions)?buffer_tostring(dimensions):""
+            , after
+            , before
+            , points
+            , group
+            , format
+            , options
+            );
+
+    if(outFileName && *outFileName) {
+        buffer_sprintf(w->response.header, "Content-Disposition: attachment; filename=\"%s\"\r\n", outFileName);
+        debug(D_WEB_CLIENT, "%llu: generating outfilename header: '%s'", w->id, outFileName);
+    }
+
+    if(format == DATASOURCE_DATATABLE_JSONP) {
+        if(responseHandler == NULL)
+            responseHandler = "google.visualization.Query.setResponse";
+
+        debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSON/JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
+                w->id, google_version, google_reqId, google_sig, google_out, responseHandler, outFileName
+            );
+
+        buffer_sprintf(w->response.data,
+            "%s({version:'%s',reqId:'%s',status:'ok',sig:'%ld',table:",
+            responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
+    }
+    else if(format == DATASOURCE_JSONP) {
+        if(responseHandler == NULL)
+            responseHandler = "callback";
+
+        buffer_strcat(w->response.data, responseHandler);
+        buffer_strcat(w->response.data, "(");
+    }
+
+    ret = rrd2format(st, w->response.data, dimensions, format, points, after, before, group, options, &last_timestamp_in_data);
+
+    if(format == DATASOURCE_DATATABLE_JSONP) {
+        if(google_timestamp < last_timestamp_in_data)
+            buffer_strcat(w->response.data, "});");
+
+        else {
+            // the client already has the latest data
+            buffer_flush(w->response.data);
+            buffer_sprintf(w->response.data,
+                "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
+                responseHandler, google_version, google_reqId);
+        }
+    }
+    else if(format == DATASOURCE_JSONP)
+        buffer_strcat(w->response.data, ");");
 
 cleanup:
-	if(dimensions) buffer_free(dimensions);
-	return ret;
+    if(dimensions) buffer_free(dimensions);
+    return ret;
 }
 
 int web_client_api_request_v1_registry(struct web_client *w, char *url)
 {
-	char person_guid[36 + 1] = "";
-
-	debug(D_WEB_CLIENT, "%llu: API v1 registry with URL '%s'", w->id, url);
-
-	// FIXME
-	// The browser may send multiple cookies with our id
-	
-	char *cookie = strstr(w->response.data->buffer, " " NETDATA_REGISTRY_COOKIE_NAME "=");
-	if(cookie)
-		strncpyz(person_guid, &cookie[sizeof(NETDATA_REGISTRY_COOKIE_NAME) + 1], 36);
-
-	char action = '\0';
-	char *machine_guid = NULL,
-			*machine_url = NULL,
-			*url_name = NULL,
-			*search_machine_guid = NULL,
-			*delete_url = NULL,
-			*to_person_guid = NULL;
-
-	while(url) {
-		char *value = mystrsep(&url, "?&[]");
-		if (!value || !*value) continue;
-
-		char *name = mystrsep(&value, "=");
-		if (!name || !*name) continue;
-		if (!value || !*value) continue;
-
-		debug(D_WEB_CLIENT, "%llu: API v1 registry query param '%s' with value '%s'", w->id, name, value);
-
-		if(!strcmp(name, "action")) {
-			if(!strcmp(value, "access")) action = 'A';
-			else if(!strcmp(value, "hello")) action = 'H';
-			else if(!strcmp(value, "delete")) action = 'D';
-			else if(!strcmp(value, "search")) action = 'S';
-			else if(!strcmp(value, "switch")) action = 'W';
-		}
-		else if(!strcmp(name, "machine"))
-			machine_guid = value;
-
-		else if(!strcmp(name, "url"))
-			machine_url = value;
-
-		else if(action == 'A') {
-			if(!strcmp(name, "name"))
-				url_name = value;
-		}
-		else if(action == 'D') {
-			if(!strcmp(name, "delete_url"))
-				delete_url = value;
-		}
-		else if(action == 'S') {
-			if(!strcmp(name, "for"))
-				search_machine_guid = value;
-		}
-		else if(action == 'W') {
-			if(!strcmp(name, "to"))
-				to_person_guid = value;
-		}
-	}
-
-	if(action == 'A' && (!machine_guid || !machine_url || !url_name)) {
-		buffer_flush(w->response.data);
-		buffer_sprintf(w->response.data, "Invalid registry request - access requires these parameters: machine ('%s'), url ('%s'), name ('%s')",
-					   machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", url_name?url_name:"UNSET");
-		return 400;
-	}
-	else if(action == 'D' && (!machine_guid || !machine_url || !delete_url)) {
-		buffer_flush(w->response.data);
-		buffer_sprintf(w->response.data, "Invalid registry request - delete requires these parameters: machine ('%s'), url ('%s'), delete_url ('%s')",
-					   machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", delete_url?delete_url:"UNSET");
-		return 400;
-	}
-	else if(action == 'S' && (!machine_guid || !machine_url || !search_machine_guid)) {
-		buffer_flush(w->response.data);
-		buffer_sprintf(w->response.data, "Invalid registry request - search requires these parameters: machine ('%s'), url ('%s'), for ('%s')",
-					   machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", search_machine_guid?search_machine_guid:"UNSET");
-		return 400;
-	}
-	else if(action == 'W' && (!machine_guid || !machine_url || !to_person_guid)) {
-		buffer_flush(w->response.data);
-		buffer_sprintf(w->response.data, "Invalid registry request - switching identity requires these parameters: machine ('%s'), url ('%s'), to ('%s')",
-					   machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", to_person_guid?to_person_guid:"UNSET");
-		return 400;
-	}
-
-	switch(action) {
-		case 'A':
-			return registry_request_access_json(w, person_guid, machine_guid, machine_url, url_name, time(NULL));
-
-		case 'D':
-			return registry_request_delete_json(w, person_guid, machine_guid, machine_url, delete_url, time(NULL));
-
-		case 'S':
-			return registry_request_search_json(w, person_guid, machine_guid, machine_url, search_machine_guid, time(NULL));
-
-		case 'W':
-			return registry_request_switch_json(w, person_guid, machine_guid, machine_url, to_person_guid, time(NULL));
-
-		case 'H':
-			return registry_request_hello_json(w);
-
-		default:
-			buffer_flush(w->response.data);
-			buffer_sprintf(w->response.data, "Invalid registry request - you need to set an action: hello, access, delete, search");
-			return 400;
-	}
-
-	buffer_flush(w->response.data);
-	buffer_sprintf(w->response.data, "Invalid or no registry action.");
-	return 400;
+    static uint32_t hash_action = 0, hash_access = 0, hash_hello = 0, hash_delete = 0, hash_search = 0,
+            hash_switch = 0, hash_machine = 0, hash_url = 0, hash_name = 0, hash_delete_url = 0, hash_for = 0,
+            hash_to = 0 /*, hash_redirects = 0 */;
+
+    if(unlikely(!hash_action)) {
+        hash_action = simple_hash("action");
+        hash_access = simple_hash("access");
+        hash_hello = simple_hash("hello");
+        hash_delete = simple_hash("delete");
+        hash_search = simple_hash("search");
+        hash_switch = simple_hash("switch");
+        hash_machine = simple_hash("machine");
+        hash_url = simple_hash("url");
+        hash_name = simple_hash("name");
+        hash_delete_url = simple_hash("delete_url");
+        hash_for = simple_hash("for");
+        hash_to = simple_hash("to");
+/*
+        hash_redirects = simple_hash("redirects");
+*/
+    }
+
+    char person_guid[36 + 1] = "";
+
+    debug(D_WEB_CLIENT, "%llu: API v1 registry with URL '%s'", w->id, url);
+
+    // FIXME
+    // The browser may send multiple cookies with our id
+    
+    char *cookie = strstr(w->response.data->buffer, NETDATA_REGISTRY_COOKIE_NAME "=");
+    if(cookie)
+        strncpyz(person_guid, &cookie[sizeof(NETDATA_REGISTRY_COOKIE_NAME)], 36);
+
+    char action = '\0';
+    char *machine_guid = NULL,
+            *machine_url = NULL,
+            *url_name = NULL,
+            *search_machine_guid = NULL,
+            *delete_url = NULL,
+            *to_person_guid = NULL;
+/*
+    int redirects = 0;
+*/
+
+    while(url) {
+        char *value = mystrsep(&url, "?&[]");
+        if (!value || !*value) continue;
+
+        char *name = mystrsep(&value, "=");
+        if (!name || !*name) continue;
+        if (!value || !*value) continue;
+
+        debug(D_WEB_CLIENT, "%llu: API v1 registry query param '%s' with value '%s'", w->id, name, value);
+
+        uint32_t hash = simple_hash(name);
+
+        if(hash == hash_action && !strcmp(name, "action")) {
+            uint32_t vhash = simple_hash(value);
+
+            if(vhash == hash_access && !strcmp(value, "access")) action = 'A';
+            else if(vhash == hash_hello && !strcmp(value, "hello")) action = 'H';
+            else if(vhash == hash_delete && !strcmp(value, "delete")) action = 'D';
+            else if(vhash == hash_search && !strcmp(value, "search")) action = 'S';
+            else if(vhash == hash_switch && !strcmp(value, "switch")) action = 'W';
+#ifdef NETDATA_INTERNAL_CHECKS
+            else error("unknown registry action '%s'", value);
+#endif /* NETDATA_INTERNAL_CHECKS */
+        }
+/*
+        else if(hash == hash_redirects && !strcmp(name, "redirects"))
+            redirects = atoi(value);
+*/
+        else if(hash == hash_machine && !strcmp(name, "machine"))
+            machine_guid = value;
+
+        else if(hash == hash_url && !strcmp(name, "url"))
+            machine_url = value;
+
+        else if(action == 'A') {
+            if(hash == hash_name && !strcmp(name, "name"))
+                url_name = value;
+        }
+        else if(action == 'D') {
+            if(hash == hash_delete_url && !strcmp(name, "delete_url"))
+                delete_url = value;
+        }
+        else if(action == 'S') {
+            if(hash == hash_for && !strcmp(name, "for"))
+                search_machine_guid = value;
+        }
+        else if(action == 'W') {
+            if(hash == hash_to && !strcmp(name, "to"))
+                to_person_guid = value;
+        }
+#ifdef NETDATA_INTERNAL_CHECKS
+        else error("unused registry URL parameter '%s' with value '%s'", name, value);
+#endif /* NETDATA_INTERNAL_CHECKS */
+    }
+
+    if(web_donotrack_comply && w->donottrack) {
+        buffer_flush(w->response.data);
+        buffer_sprintf(w->response.data, "Your web browser is sending 'DNT: 1' (Do Not Track). The registry requires persistent cookies on your browser to work.");
+        return 400;
+    }
+
+    if(action == 'A' && (!machine_guid || !machine_url || !url_name)) {
+        buffer_flush(w->response.data);
+        buffer_sprintf(w->response.data, "Invalid registry request - access requires these parameters: machine ('%s'), url ('%s'), name ('%s')",
+                       machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", url_name?url_name:"UNSET");
+        return 400;
+    }
+    else if(action == 'D' && (!machine_guid || !machine_url || !delete_url)) {
+        buffer_flush(w->response.data);
+        buffer_sprintf(w->response.data, "Invalid registry request - delete requires these parameters: machine ('%s'), url ('%s'), delete_url ('%s')",
+                       machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", delete_url?delete_url:"UNSET");
+        return 400;
+    }
+    else if(action == 'S' && (!machine_guid || !machine_url || !search_machine_guid)) {
+        buffer_flush(w->response.data);
+        buffer_sprintf(w->response.data, "Invalid registry request - search requires these parameters: machine ('%s'), url ('%s'), for ('%s')",
+                       machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", search_machine_guid?search_machine_guid:"UNSET");
+        return 400;
+    }
+    else if(action == 'W' && (!machine_guid || !machine_url || !to_person_guid)) {
+        buffer_flush(w->response.data);
+        buffer_sprintf(w->response.data, "Invalid registry request - switching identity requires these parameters: machine ('%s'), url ('%s'), to ('%s')",
+                       machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", to_person_guid?to_person_guid:"UNSET");
+        return 400;
+    }
+
+    switch(action) {
+        case 'A':
+            w->tracking_required = 1;
+            if(registry_verify_cookies_redirects() > 0 && (!cookie || !person_guid[0])) {
+                buffer_flush(w->response.data);
+
+                registry_set_cookie(w, "give-me-back-this-cookie-please");
+                w->response.data->contenttype = CT_APPLICATION_JSON;
+                buffer_sprintf(w->response.data, "{ \"status\": \"redirect\", \"registry\": \"%s\" }", registry_to_announce());
+                return 200;
+
+/*
+ * it seems that web browsers are ignoring 307 (Moved Temporarily)
+ * under certain conditions, when using CORS
+ * so this is commented and we use application level redirects instead
+ *
+                redirects++;
+
+                if(redirects > registry_verify_cookies_redirects()) {
+                    buffer_flush(w->response.data);
+                    buffer_sprintf(w->response.data, "Your browser does not support cookies");
+                    return 400;
+                }
+
+                char *encoded_url = url_encode(machine_url);
+                if(!encoded_url) {
+                    error("%llu: Cannot URL encode string '%s'", w->id, machine_url);
+                    return 500;
+                }
+
+                char *encoded_name = url_encode(url_name);
+                if(!encoded_name) {
+                    free(encoded_url);
+                    error("%llu: Cannot URL encode string '%s'", w->id, url_name);
+                    return 500;
+                }
+
+                char *encoded_guid = url_encode(machine_guid);
+                if(!encoded_guid) {
+                    free(encoded_url);
+                    free(encoded_name);
+                    error("%llu: Cannot URL encode string '%s'", w->id, machine_guid);
+                    return 500;
+                }
+
+                buffer_sprintf(w->response.header, "Location: %s/api/v1/registry?action=access&machine=%s&name=%s&url=%s&redirects=%d\r\n",
+                               registry_to_announce(), encoded_guid, encoded_name, encoded_url, redirects);
+
+                free(encoded_guid);
+                free(encoded_name);
+                free(encoded_url);
+                return 307
+*/
+            }
+            return registry_request_access_json(w, person_guid, machine_guid, machine_url, url_name, time(NULL));
+
+        case 'D':
+            w->tracking_required = 1;
+            return registry_request_delete_json(w, person_guid, machine_guid, machine_url, delete_url, time(NULL));
+
+        case 'S':
+            w->tracking_required = 1;
+            return registry_request_search_json(w, person_guid, machine_guid, machine_url, search_machine_guid, time(NULL));
+
+        case 'W':
+            w->tracking_required = 1;
+            return registry_request_switch_json(w, person_guid, machine_guid, machine_url, to_person_guid, time(NULL));
+
+        case 'H':
+            return registry_request_hello_json(w);
+
+        default:
+            buffer_flush(w->response.data);
+            buffer_strcat(w->response.data, "Invalid registry request - you need to set an action: hello, access, delete, search");
+            return 400;
+    }
 }
 
-int web_client_api_request_v1(struct web_client *w, char *url)
-{
-	static uint32_t data_hash = 0, chart_hash = 0, charts_hash = 0, registry_hash = 0;
-
-	if(unlikely(data_hash == 0)) {
-		data_hash = simple_hash("data");
-		chart_hash = simple_hash("chart");
-		charts_hash = simple_hash("charts");
-		registry_hash = simple_hash("registry");
-	}
-
-	// get the command
-	char *tok = mystrsep(&url, "/?&");
-	if(tok && *tok) {
-		debug(D_WEB_CLIENT, "%llu: Searching for API v1 command '%s'.", w->id, tok);
-		uint32_t hash = simple_hash(tok);
-
-		if(hash == data_hash && !strcmp(tok, "data"))
-			return web_client_api_request_v1_data(w, url);
-
-		else if(hash == chart_hash && !strcmp(tok, "chart"))
-			return web_client_api_request_v1_chart(w, url);
-
-		else if(hash == charts_hash && !strcmp(tok, "charts"))
-			return web_client_api_request_v1_charts(w, url);
-
-		else if(hash == registry_hash && !strcmp(tok, "registry"))
-			return web_client_api_request_v1_registry(w, url);
-
-		else {
-			buffer_flush(w->response.data);
-			buffer_sprintf(w->response.data, "Unsupported v1 API command: %s", tok);
-			return 404;
-		}
-	}
-	else {
-		buffer_flush(w->response.data);
-		buffer_sprintf(w->response.data, "API v1 command?");
-		return 400;
-	}
+int web_client_api_request_v1(struct web_client *w, char *url) {
+    static uint32_t hash_data = 0, hash_chart = 0, hash_charts = 0, hash_registry = 0, hash_badge = 0, hash_alarms = 0, hash_alarm_log = 0;
+
+    if(unlikely(hash_data == 0)) {
+        hash_data = simple_hash("data");
+        hash_chart = simple_hash("chart");
+        hash_charts = simple_hash("charts");
+        hash_registry = simple_hash("registry");
+        hash_badge = simple_hash("badge.svg");
+        hash_alarms = simple_hash("alarms");
+        hash_alarm_log = simple_hash("alarm_log");
+    }
+
+    // get the command
+    char *tok = mystrsep(&url, "/?&");
+    if(tok && *tok) {
+        debug(D_WEB_CLIENT, "%llu: Searching for API v1 command '%s'.", w->id, tok);
+        uint32_t hash = simple_hash(tok);
+
+        if(hash == hash_data && !strcmp(tok, "data"))
+            return web_client_api_request_v1_data(w, url);
+
+        else if(hash == hash_chart && !strcmp(tok, "chart"))
+            return web_client_api_request_v1_chart(w, url);
+
+        else if(hash == hash_charts && !strcmp(tok, "charts"))
+            return web_client_api_request_v1_charts(w, url);
+
+        else if(hash == hash_registry && !strcmp(tok, "registry"))
+            return web_client_api_request_v1_registry(w, url);
+
+        else if(hash == hash_badge && !strcmp(tok, "badge.svg"))
+            return web_client_api_request_v1_badge(w, url);
+
+        else if(hash == hash_alarms && !strcmp(tok, "alarms"))
+            return web_client_api_request_v1_alarms(w, url);
+
+        else if(hash == hash_alarm_log && !strcmp(tok, "alarm_log"))
+            return web_client_api_request_v1_alarm_log(w, url);
+
+        else {
+            buffer_flush(w->response.data);
+            buffer_sprintf(w->response.data, "Unsupported v1 API command: %s", tok);
+            return 404;
+        }
+    }
+    else {
+        buffer_flush(w->response.data);
+        buffer_sprintf(w->response.data, "API v1 command?");
+        return 400;
+    }
 }
 
 int web_client_api_request(struct web_client *w, char *url)
 {
-	// get the api version
-	char *tok = mystrsep(&url, "/?&");
-	if(tok && *tok) {
-		debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
-		if(strcmp(tok, "v1") == 0)
-			return web_client_api_request_v1(w, url);
-		else {
-			buffer_flush(w->response.data);
-			buffer_sprintf(w->response.data, "Unsupported API version: %s", tok);
-			return 404;
-		}
-	}
-	else {
-		buffer_flush(w->response.data);
-		buffer_sprintf(w->response.data, "Which API version?");
-		return 400;
-	}
+    // get the api version
+    char *tok = mystrsep(&url, "/?&");
+    if(tok && *tok) {
+        debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
+        if(strcmp(tok, "v1") == 0)
+            return web_client_api_request_v1(w, url);
+        else {
+            buffer_flush(w->response.data);
+            buffer_sprintf(w->response.data, "Unsupported API version: %s", tok);
+            return 404;
+        }
+    }
+    else {
+        buffer_flush(w->response.data);
+        buffer_sprintf(w->response.data, "Which API version?");
+        return 400;
+    }
 }
 
-int web_client_data_request(struct web_client *w, char *url, int datasource_type)
+int web_client_api_old_data_request(struct web_client *w, char *url, int datasource_type)
 {
-	RRDSET *st = NULL;
-
-	char *args = strchr(url, '?');
-	if(args) {
-		*args='\0';
-		args = &args[1];
-	}
-
-	// get the name of the data to show
-	char *tok = mystrsep(&url, "/");
-
-	// do we have such a data set?
-	if(tok && *tok) {
-		debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
-		st = rrdset_find_byname(tok);
-		if(!st) st = rrdset_find(tok);
-	}
-
-	if(!st) {
-		// we don't have it
-		// try to send a file with that name
-		buffer_flush(w->response.data);
-		return(mysendfile(w, tok));
-	}
-
-	// we have it
-	debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
-
-	// how many entries does the client want?
-	long lines = rrd_default_history_entries;
-	long group_count = 1;
-	time_t after = 0, before = 0;
-	int group_method = GROUP_AVERAGE;
-	int nonzero = 0;
-
-	if(url) {
-		// parse the lines required
-		tok = mystrsep(&url, "/");
-		if(tok) lines = atoi(tok);
-		if(lines < 1) lines = 1;
-	}
-	if(url) {
-		// parse the group count required
-		tok = mystrsep(&url, "/");
-		if(tok && *tok) group_count = atoi(tok);
-		if(group_count < 1) group_count = 1;
-		//if(group_count > save_history / 20) group_count = save_history / 20;
-	}
-	if(url) {
-		// parse the grouping method required
-		tok = mystrsep(&url, "/");
-		if(tok && *tok) {
-			if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
-			else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
-			else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
-			else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
-		}
-	}
-	if(url) {
-		// parse after time
-		tok = mystrsep(&url, "/");
-		if(tok && *tok) after = strtoul(tok, NULL, 10);
-		if(after < 0) after = 0;
-	}
-	if(url) {
-		// parse before time
-		tok = mystrsep(&url, "/");
-		if(tok && *tok) before = strtoul(tok, NULL, 10);
-		if(before < 0) before = 0;
-	}
-	if(url) {
-		// parse nonzero
-		tok = mystrsep(&url, "/");
-		if(tok && *tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
-	}
-
-	w->response.data->contenttype = CT_APPLICATION_JSON;
-	buffer_flush(w->response.data);
-
-	char *google_version = "0.6";
-	char *google_reqId = "0";
-	char *google_sig = "0";
-	char *google_out = "json";
-	char *google_responseHandler = "google.visualization.Query.setResponse";
-	char *google_outFileName = NULL;
-	time_t last_timestamp_in_data = 0;
-	if(datasource_type == DATASOURCE_DATATABLE_JSON || datasource_type == DATASOURCE_DATATABLE_JSONP) {
-
-		w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
-
-		while(args) {
-			tok = mystrsep(&args, "&");
-			if(tok && *tok) {
-				char *name = mystrsep(&tok, "=");
-				if(name && *name && strcmp(name, "tqx") == 0) {
-					char *key = mystrsep(&tok, ":");
-					char *value = mystrsep(&tok, ";");
-					if(key && value && *key && *value) {
-						if(strcmp(key, "version") == 0)
-							google_version = value;
-
-						else if(strcmp(key, "reqId") == 0)
-							google_reqId = value;
-
-						else if(strcmp(key, "sig") == 0)
-							google_sig = value;
-
-						else if(strcmp(key, "out") == 0)
-							google_out = value;
-
-						else if(strcmp(key, "responseHandler") == 0)
-							google_responseHandler = value;
-
-						else if(strcmp(key, "outFileName") == 0)
-							google_outFileName = value;
-					}
-				}
-			}
-		}
-
-		debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
-			w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
-			);
-
-		if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
-			last_timestamp_in_data = strtoul(google_sig, NULL, 0);
-
-			// check the client wants json
-			if(strcmp(google_out, "json") != 0) {
-				buffer_sprintf(w->response.data,
-					"%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'invalid_query',message:'output format is not supported',detailed_message:'the format %s requested is not supported by netdata.'}]});",
-					google_responseHandler, google_version, google_reqId, google_out);
-					return 200;
-			}
-		}
-	}
-
-	if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
-		buffer_sprintf(w->response.data,
-			"%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
-			google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
-	}
-
-	debug(D_WEB_CLIENT_ACCESS, "%llu: Sending RRD data '%s' (id %s, %d lines, %d group, %d group_method, %lu after, %lu before).", w->id, st->name, st->id, lines, group_count, group_method, after, before);
-	time_t timestamp_in_data = rrd_stats_json(datasource_type, st, w->response.data, lines, group_count, group_method, after, before, nonzero);
-
-	if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
-		if(timestamp_in_data > last_timestamp_in_data)
-			buffer_strcat(w->response.data, "});");
-
-		else {
-			// the client already has the latest data
-			buffer_flush(w->response.data);
-			buffer_sprintf(w->response.data,
-				"%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
-				google_responseHandler, google_version, google_reqId);
-		}
-	}
-
-	return 200;
+    RRDSET *st = NULL;
+
+    char *args = strchr(url, '?');
+    if(args) {
+        *args='\0';
+        args = &args[1];
+    }
+
+    // get the name of the data to show
+    char *tok = mystrsep(&url, "/");
+    if(!tok) tok = "";
+
+    // do we have such a data set?
+    if(*tok) {
+        debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
+        st = rrdset_find_byname(tok);
+        if(!st) st = rrdset_find(tok);
+    }
+
+    if(!st) {
+        // we don't have it
+        // try to send a file with that name
+        buffer_flush(w->response.data);
+        return(mysendfile(w, tok));
+    }
+
+    // we have it
+    debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
+
+    // how many entries does the client want?
+    int lines = rrd_default_history_entries;
+    int group_count = 1;
+    time_t after = 0, before = 0;
+    int group_method = GROUP_AVERAGE;
+    int nonzero = 0;
+
+    if(url) {
+        // parse the lines required
+        tok = mystrsep(&url, "/");
+        if(tok) lines = atoi(tok);
+        if(lines < 1) lines = 1;
+    }
+    if(url) {
+        // parse the group count required
+        tok = mystrsep(&url, "/");
+        if(tok && *tok) group_count = atoi(tok);
+        if(group_count < 1) group_count = 1;
+        //if(group_count > save_history / 20) group_count = save_history / 20;
+    }
+    if(url) {
+        // parse the grouping method required
+        tok = mystrsep(&url, "/");
+        if(tok && *tok) {
+            if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
+            else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
+            else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
+            else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
+        }
+    }
+    if(url) {
+        // parse after time
+        tok = mystrsep(&url, "/");
+        if(tok && *tok) after = strtoul(tok, NULL, 10);
+        if(after < 0) after = 0;
+    }
+    if(url) {
+        // parse before time
+        tok = mystrsep(&url, "/");
+        if(tok && *tok) before = strtoul(tok, NULL, 10);
+        if(before < 0) before = 0;
+    }
+    if(url) {
+        // parse nonzero
+        tok = mystrsep(&url, "/");
+        if(tok && *tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
+    }
+
+    w->response.data->contenttype = CT_APPLICATION_JSON;
+    buffer_flush(w->response.data);
+
+    char *google_version = "0.6";
+    char *google_reqId = "0";
+    char *google_sig = "0";
+    char *google_out = "json";
+    char *google_responseHandler = "google.visualization.Query.setResponse";
+    char *google_outFileName = NULL;
+    time_t last_timestamp_in_data = 0;
+    if(datasource_type == DATASOURCE_DATATABLE_JSON || datasource_type == DATASOURCE_DATATABLE_JSONP) {
+
+        w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
+
+        while(args) {
+            tok = mystrsep(&args, "&");
+            if(tok && *tok) {
+                char *name = mystrsep(&tok, "=");
+                if(name && *name && strcmp(name, "tqx") == 0) {
+                    char *key = mystrsep(&tok, ":");
+                    char *value = mystrsep(&tok, ";");
+                    if(key && value && *key && *value) {
+                        if(strcmp(key, "version") == 0)
+                            google_version = value;
+
+                        else if(strcmp(key, "reqId") == 0)
+                            google_reqId = value;
+
+                        else if(strcmp(key, "sig") == 0)
+                            google_sig = value;
+
+                        else if(strcmp(key, "out") == 0)
+                            google_out = value;
+
+                        else if(strcmp(key, "responseHandler") == 0)
+                            google_responseHandler = value;
+
+                        else if(strcmp(key, "outFileName") == 0)
+                            google_outFileName = value;
+                    }
+                }
+            }
+        }
+
+        debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
+            w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
+            );
+
+        if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
+            last_timestamp_in_data = strtoul(google_sig, NULL, 0);
+
+            // check the client wants json
+            if(strcmp(google_out, "json") != 0) {
+                buffer_sprintf(w->response.data,
+                    "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'invalid_query',message:'output format is not supported',detailed_message:'the format %s requested is not supported by netdata.'}]});",
+                    google_responseHandler, google_version, google_reqId, google_out);
+                    return 200;
+            }
+        }
+    }
+
+    if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
+        buffer_sprintf(w->response.data,
+            "%s({version:'%s',reqId:'%s',status:'ok',sig:'%ld',table:",
+            google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
+    }
+
+    debug(D_WEB_CLIENT_ACCESS, "%llu: Sending RRD data '%s' (id %s, %d lines, %d group, %d group_method, %ld after, %ld before).",
+        w->id, st->name, st->id, lines, group_count, group_method, after, before);
+
+    time_t timestamp_in_data = rrd_stats_json(datasource_type, st, w->response.data, lines, group_count, group_method, (unsigned long)after, (unsigned long)before, nonzero);
+
+    if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
+        if(timestamp_in_data > last_timestamp_in_data)
+            buffer_strcat(w->response.data, "});");
+
+        else {
+            // the client already has the latest data
+            buffer_flush(w->response.data);
+            buffer_sprintf(w->response.data,
+                "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
+                google_responseHandler, google_version, google_reqId);
+        }
+    }
+
+    return 200;
 }
 
-/*
-int web_client_parse_request(struct web_client *w) {
-	// protocol
-	// hostname
-	// path
-	// query string name-value
-	// http version
-	// method
-	// http request headers name-value
+const char *web_content_type_to_string(uint8_t contenttype) {
+    switch(contenttype) {
+        case CT_TEXT_HTML:
+            return "text/html; charset=utf-8";
 
-	web_client_clean_request(w);
+        case CT_APPLICATION_XML:
+            return "application/xml; charset=utf-8";
 
-	debug(D_WEB_DATA, "%llu: Processing data buffer of %d bytes: '%s'.", w->id, w->response.data->bytes, w->response.data->buffer);
+        case CT_APPLICATION_JSON:
+            return "application/json; charset=utf-8";
 
-	char *buf = w->response.data->buffer;
-	char *line, *tok;
+        case CT_APPLICATION_X_JAVASCRIPT:
+            return "application/x-javascript; charset=utf-8";
 
-	// ------------------------------------------------------------------------
-	// the first line
+        case CT_TEXT_CSS:
+            return "text/css; charset=utf-8";
 
-	if(buf && (line = strsep(&buf, "\r\n"))) {
-		// method
-		if(line && (tok = strsep(&line, " "))) {
-			w->request.protocol = strdup(tok);
-		}
-		else goto cleanup;
+        case CT_TEXT_XML:
+            return "text/xml; charset=utf-8";
 
-		// url
-	}
-	else goto cleanup;
+        case CT_TEXT_XSL:
+            return "text/xsl; charset=utf-8";
 
-	// ------------------------------------------------------------------------
-	// the rest of the lines
+        case CT_APPLICATION_OCTET_STREAM:
+            return "application/octet-stream";
 
-	while(buf && (line = strsep(&buf, "\r\n"))) {
-		while(line && (tok = strsep(&line, ": "))) {
-		}
-	}
+        case CT_IMAGE_SVG_XML:
+            return "image/svg+xml";
 
-	char *url = NULL;
+        case CT_APPLICATION_X_FONT_TRUETYPE:
+            return "application/x-font-truetype";
 
+        case CT_APPLICATION_X_FONT_OPENTYPE:
+            return "application/x-font-opentype";
 
-cleanup:
-	web_client_clean_request(w);
-	return 0;
+        case CT_APPLICATION_FONT_WOFF:
+            return "application/font-woff";
+
+        case CT_APPLICATION_FONT_WOFF2:
+            return "application/font-woff2";
+
+        case CT_APPLICATION_VND_MS_FONTOBJ:
+            return "application/vnd.ms-fontobject";
+
+        case CT_IMAGE_PNG:
+            return "image/png";
+
+        case CT_IMAGE_JPG:
+            return "image/jpeg";
+
+        case CT_IMAGE_GIF:
+            return "image/gif";
+
+        case CT_IMAGE_XICON:
+            return "image/x-icon";
+
+        case CT_IMAGE_BMP:
+            return "image/bmp";
+
+        case CT_IMAGE_ICNS:
+            return "image/icns";
+
+        default:
+        case CT_TEXT_PLAIN:
+            return "text/plain; charset=utf-8";
+    }
 }
-*/
 
 
-static inline char *http_header_parse(struct web_client *w, char *s) {
-	char *e = s;
+const char *web_response_code_to_string(int code) {
+    switch(code) {
+        case 200:
+            return "OK";
+
+        case 307:
+            return "Temporary Redirect";
 
-	// find the :
-	while(*e && *e != ':') e++;
-	if(!*e || e[1] != ' ') return e;
+        case 400:
+            return "Bad Request";
 
-	// get the name
-	*e = '\0';
+        case 403:
+            return "Forbidden";
 
-	// find the value
-	char *v, *ve;
-	v = ve = e + 2;
+        case 404:
+            return "Not Found";
 
-	// find the \r
-	while(*ve && *ve != '\r') ve++;
-	if(!*ve || ve[1] != '\n') {
-		*e = ':';
-		return ve;
-	}
+        case 412:
+            return "Preconditions Failed";
 
-	// terminate the value
-	*ve = '\0';
+        default:
+            if(code >= 100 && code < 200)
+                return "Informational";
 
-	// fprintf(stderr, "HEADER: '%s' = '%s'\n", s, v);
+            if(code >= 200 && code < 300)
+                return "Successful";
 
-	if(!strcasecmp(s, "Origin"))
-		strncpyz(w->origin, v, ORIGIN_MAX);
+            if(code >= 300 && code < 400)
+                return "Redirection";
+
+            if(code >= 400 && code < 500)
+                return "Bad Request";
+
+            if(code >= 500 && code < 600)
+                return "Server Error";
+
+            return "Undefined Error";
+    }
+}
 
-	else if(!strcasecmp(s, "Connection")) {
-		if(strcasestr(v, "keep-alive"))
-			w->keepalive = 1;
-	}
+static inline char *http_header_parse(struct web_client *w, char *s) {
+    static uint32_t hash_origin = 0, hash_connection = 0, hash_accept_encoding = 0, hash_donottrack = 0;
+
+    if(unlikely(!hash_origin)) {
+        hash_origin = simple_uhash("Origin");
+        hash_connection = simple_uhash("Connection");
+        hash_accept_encoding = simple_uhash("Accept-Encoding");
+        hash_donottrack = simple_uhash("DNT");
+    }
+
+    char *e = s;
+
+    // find the :
+    while(*e && *e != ':') e++;
+    if(!*e) return e;
+
+    // get the name
+    *e = '\0';
+
+    // find the value
+    char *v = e + 1, *ve;
+
+    // skip leading spaces from value
+    while(*v == ' ') v++;
+    ve = v;
+
+    // find the \r
+    while(*ve && *ve != '\r') ve++;
+    if(!*ve || ve[1] != '\n') {
+        *e = ':';
+        return ve;
+    }
+
+    // terminate the value
+    *ve = '\0';
+
+    // fprintf(stderr, "HEADER: '%s' = '%s'\n", s, v);
+    uint32_t hash = simple_uhash(s);
+
+    if(hash == hash_origin && !strcasecmp(s, "Origin"))
+        strncpyz(w->origin, v, ORIGIN_MAX);
+
+    else if(hash == hash_connection && !strcasecmp(s, "Connection")) {
+        if(strcasestr(v, "keep-alive"))
+            w->keepalive = 1;
+    }
+    else if(web_donotrack_comply && hash == hash_donottrack && !strcasecmp(s, "DNT")) {
+        if(*v == '0') w->donottrack = 0;
+        else if(*v == '1') w->donottrack = 1;
+    }
 #ifdef NETDATA_WITH_ZLIB
-	else if(!strcasecmp(s, "Accept-Encoding")) {
-		if(web_enable_gzip && strcasestr(v, "gzip")) {
-			w->enable_gzip = 1;
-		}
-	}
+    else if(hash == hash_accept_encoding && !strcasecmp(s, "Accept-Encoding")) {
+        if(web_enable_gzip) {
+            if(strcasestr(v, "gzip"))
+                web_client_enable_deflate(w, 1);
+            //
+            // does not seem to work
+            // else if(strcasestr(v, "deflate"))
+            //  web_client_enable_deflate(w, 0);
+        }
+    }
 #endif /* NETDATA_WITH_ZLIB */
 
-	*e = ':';
-	*ve = '\r';
-	return ve;
+    *e = ':';
+    *ve = '\r';
+    return ve;
 }
 
 // http_request_validate()
 // returns:
 // = 0 : all good, process the request
-// > 0 : request is complete, but is not supported
+// > 0 : request is not supported
 // < 0 : request is incomplete - wait for more data
 
 static inline int http_request_validate(struct web_client *w) {
-	char *s = w->response.data->buffer, *encoded_url = NULL;
-
-	// is is a valid request?
-	if(!strncmp(s, "GET ", 4)) {
-		encoded_url = s = &s[4];
-		w->mode = WEB_CLIENT_MODE_NORMAL;
-	}
-	else if(!strncmp(s, "OPTIONS ", 8)) {
-		encoded_url = s = &s[8];
-		w->mode = WEB_CLIENT_MODE_OPTIONS;
-	}
-	else {
-		w->wait_receive = 0;
-		return 1;
-	}
-
-	// find the SPACE + "HTTP/"
-	while(*s) {
-		// find the space
-		while (*s && *s != ' ') s++;
-
-		// is it SPACE + "HTTP/" ?
-		if(*s && !strncmp(s, " HTTP/", 6)) break;
-		else s++;
-	}
-
-	// incomplete requests
-	if(!*s) {
-		w->wait_receive = 1;
-		return -2;
-	}
-
-	// we have the end of encoded_url - remember it
-	char *ue = s;
-
-	while(*s) {
-		// find a line feed
-		while (*s && *s != '\r') s++;
-
-		// did we reach the end?
-		if(unlikely(!*s)) break;
-
-		// is it \r\n ?
-		if (likely(s[1] == '\n')) {
-
-			// is it again \r\n ? (header end)
-			if(unlikely(s[2] == '\r' && s[3] == '\n')) {
-				// a valid complete HTTP request found
-
-				*ue = '\0';
-				w->decoded_url = url_decode(encoded_url);
-				*ue = ' ';
-
-				w->wait_receive = 0;
-				return 0;
-			}
-
-			// another header line
-			s = http_header_parse(w, &s[2]);
-		}
-		else s++;
-	}
-
-	// incomplete request
-	w->wait_receive = 1;
-	return -3;
+    char *s = w->response.data->buffer, *encoded_url = NULL;
+
+    // is is a valid request?
+    if(!strncmp(s, "GET ", 4)) {
+        encoded_url = s = &s[4];
+        w->mode = WEB_CLIENT_MODE_NORMAL;
+    }
+    else if(!strncmp(s, "OPTIONS ", 8)) {
+        encoded_url = s = &s[8];
+        w->mode = WEB_CLIENT_MODE_OPTIONS;
+    }
+    else {
+        w->wait_receive = 0;
+        return 1;
+    }
+
+    // find the SPACE + "HTTP/"
+    while(*s) {
+        // find the next space
+        while (*s && *s != ' ') s++;
+
+        // is it SPACE + "HTTP/" ?
+        if(*s && !strncmp(s, " HTTP/", 6)) break;
+        else s++;
+    }
+
+    // incomplete requests
+    if(unlikely(!*s)) {
+        w->wait_receive = 1;
+        return -2;
+    }
+
+    // we have the end of encoded_url - remember it
+    char *ue = s;
+
+    // make sure we have complete request
+    // complete requests contain: \r\n\r\n
+    while(*s) {
+        // find a line feed
+        while(*s && *s++ != '\r');
+
+        // did we reach the end?
+        if(unlikely(!*s)) break;
+
+        // is it \r\n ?
+        if(likely(*s++ == '\n')) {
+
+            // is it again \r\n ? (header end)
+            if(unlikely(*s == '\r' && s[1] == '\n')) {
+                // a valid complete HTTP request found
+
+                *ue = '\0';
+                url_decode_r(w->decoded_url, encoded_url, URL_MAX + 1);
+                *ue = ' ';
+                
+                // copy the URL - we are going to overwrite parts of it
+                // FIXME -- we should avoid it
+                strncpyz(w->last_url, w->decoded_url, URL_MAX);
+
+                w->wait_receive = 0;
+                return 0;
+            }
+
+            // another header line
+            s = http_header_parse(w, s);
+        }
+    }
+
+    // incomplete request
+    w->wait_receive = 1;
+    return -3;
 }
 
 void web_client_process(struct web_client *w) {
-	int code = 500;
-	ssize_t bytes;
-
-	int what_to_do = http_request_validate(w);
-
-	// wait for more data
-	if(what_to_do < 0) {
-		if(w->response.data->len > TOO_BIG_REQUEST) {
-			strcpy(w->last_url, "too big request");
-
-			debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zd bytes).", w->id, w->response.data->len);
-
-			code = 400;
-			buffer_flush(w->response.data);
-			buffer_sprintf(w->response.data, "Received request is too big  (%zd bytes).\r\n", w->response.data->len);
-		}
-		else {
-			// wait for more data
-			return;
-		}
-	}
-	else if(what_to_do > 0) {
-		strcpy(w->last_url, "not a valid response");
-
-		debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, w->response.data->buffer);
-
-		code = 500;
-		buffer_flush(w->response.data);
-		buffer_strcat(w->response.data, "I don't understand you...\r\n");
-	}
-	else { // what_to_do == 0
-		gettimeofday(&w->tv_in, NULL);
-
-		global_statistics_lock();
-		global_statistics.web_requests++;
-		global_statistics_unlock();
-
-		// copy the URL - we are going to overwrite parts of it
-		// FIXME -- we should avoid it
-		strncpyz(w->last_url, w->decoded_url, URL_MAX);
-
-		if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
-			code = 200;
-			w->response.data->contenttype = CT_TEXT_PLAIN;
-			buffer_flush(w->response.data);
-			buffer_strcat(w->response.data, "OK");
-		}
-		else {
-#ifdef NETDATA_WITH_ZLIB
-			if(w->enable_gzip)
-				web_client_enable_deflate(w);
-#endif
-
-			char *url = w->decoded_url;
-			char *tok = mystrsep(&url, "/?");
-			if(tok && *tok) {
-				debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
-
-				if(strcmp(tok, "api") == 0) {
-					// the client is requesting api access
-					code = web_client_api_request(w, url);
-				}
-				else if(strcmp(tok, "netdata.conf") == 0) {
-					code = 200;
-					debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
-
-					w->response.data->contenttype = CT_TEXT_PLAIN;
-					buffer_flush(w->response.data);
-					generate_config(w->response.data, 0);
-				}
-				else if(strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
-					// the client is requesting rrd data -- OLD API
-					code = web_client_data_request(w, url, DATASOURCE_JSON);
-				}
-				else if(strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
-					// the client is requesting google datasource -- OLD API
-					code = web_client_data_request(w, url, DATASOURCE_DATATABLE_JSONP);
-				}
-				else if(strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
-					// the client is requesting an rrd graph -- OLD API
-
-					// get the name of the data to show
-					tok = mystrsep(&url, "/?&");
-					if(tok && *tok) {
-						debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
-
-						// do we have such a data set?
-						RRDSET *st = rrdset_find_byname(tok);
-						if(!st) st = rrdset_find(tok);
-						if(!st) {
-							// we don't have it
-							// try to send a file with that name
-							buffer_flush(w->response.data);
-							code = mysendfile(w, tok);
-						}
-						else {
-							code = 200;
-							debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
-							w->response.data->contenttype = CT_APPLICATION_JSON;
-							buffer_flush(w->response.data);
-							rrd_stats_graph_json(st, url, w->response.data);
-						}
-					}
-					else {
-						code = 400;
-						buffer_flush(w->response.data);
-						buffer_strcat(w->response.data, "Graph name?\r\n");
-					}
-				}
-				else if(strcmp(tok, "list") == 0) {
-					// OLD API
-					code = 200;
-
-					debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
-
-					buffer_flush(w->response.data);
-					RRDSET *st = rrdset_root;
-
-					for ( ; st ; st = st->next )
-						buffer_sprintf(w->response.data, "%s\n", st->name);
-				}
-				else if(strcmp(tok, "all.json") == 0) {
-					// OLD API
-					code = 200;
-					debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
-
-					w->response.data->contenttype = CT_APPLICATION_JSON;
-					buffer_flush(w->response.data);
-					rrd_stats_all_json(w->response.data);
-				}
+    static uint32_t hash_api = 0, hash_netdata_conf = 0, hash_data = 0, hash_datasource = 0, hash_graph = 0,
+            hash_list = 0, hash_all_json = 0, hash_exit = 0, hash_debug = 0, hash_mirror = 0;
+
+    // start timing us
+    gettimeofday(&w->tv_in, NULL);
+
+    if(unlikely(!hash_api)) {
+        hash_api = simple_hash("api");
+        hash_netdata_conf = simple_hash("netdata.conf");
+        hash_data = simple_hash(WEB_PATH_DATA);
+        hash_datasource = simple_hash(WEB_PATH_DATASOURCE);
+        hash_graph = simple_hash(WEB_PATH_GRAPH);
+        hash_list = simple_hash("list");
+        hash_all_json = simple_hash("all.json");
+        hash_exit = simple_hash("exit");
+        hash_debug = simple_hash("debug");
+        hash_mirror = simple_hash("mirror");
+    }
+
+    int code = 500;
+    ssize_t bytes;
+
+    int what_to_do = http_request_validate(w);
+
+    // wait for more data
+    if(what_to_do < 0) {
+        if(w->response.data->len > TOO_BIG_REQUEST) {
+            strcpy(w->last_url, "too big request");
+
+            debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zu bytes).", w->id, w->response.data->len);
+
+            code = 400;
+            buffer_flush(w->response.data);
+            buffer_sprintf(w->response.data, "Received request is too big  (%zu bytes).\r\n", w->response.data->len);
+        }
+        else {
+            // wait for more data
+            return;
+        }
+    }
+    else if(what_to_do > 0) {
+        // strcpy(w->last_url, "not a valid request");
+
+        debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, w->response.data->buffer);
+
+        code = 500;
+        buffer_flush(w->response.data);
+        buffer_strcat(w->response.data, "I don't understand you...\r\n");
+    }
+    else { // what_to_do == 0
+        if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
+            code = 200;
+            w->response.data->contenttype = CT_TEXT_PLAIN;
+            buffer_flush(w->response.data);
+            buffer_strcat(w->response.data, "OK");
+        }
+        else {
+            char *url = w->decoded_url;
+            char *tok = mystrsep(&url, "/?");
+            if(tok && *tok) {
+                uint32_t hash = simple_hash(tok);
+                debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
+
+                if(hash == hash_api && strcmp(tok, "api") == 0) {
+                    // the client is requesting api access
+                    code = web_client_api_request(w, url);
+                }
+                else if(hash == hash_netdata_conf && strcmp(tok, "netdata.conf") == 0) {
+                    code = 200;
+                    debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
+
+                    w->response.data->contenttype = CT_TEXT_PLAIN;
+                    buffer_flush(w->response.data);
+                    generate_config(w->response.data, 0);
+                }
+                else if(hash == hash_data && strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
+                    // the client is requesting rrd data -- OLD API
+                    code = web_client_api_old_data_request(w, url, DATASOURCE_JSON);
+                }
+                else if(hash == hash_datasource && strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
+                    // the client is requesting google datasource -- OLD API
+                    code = web_client_api_old_data_request(w, url, DATASOURCE_DATATABLE_JSONP);
+                }
+                else if(hash == hash_graph && strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
+                    // the client is requesting an rrd graph -- OLD API
+
+                    // get the name of the data to show
+                    tok = mystrsep(&url, "/?&");
+                    if(tok && *tok) {
+                        debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
+
+                        // do we have such a data set?
+                        RRDSET *st = rrdset_find_byname(tok);
+                        if(!st) st = rrdset_find(tok);
+                        if(!st) {
+                            // we don't have it
+                            // try to send a file with that name
+                            buffer_flush(w->response.data);
+                            code = mysendfile(w, tok);
+                        }
+                        else {
+                            code = 200;
+                            debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
+                            w->response.data->contenttype = CT_APPLICATION_JSON;
+                            buffer_flush(w->response.data);
+                            rrd_stats_graph_json(st, url, w->response.data);
+                        }
+                    }
+                    else {
+                        code = 400;
+                        buffer_flush(w->response.data);
+                        buffer_strcat(w->response.data, "Graph name?\r\n");
+                    }
+                }
+                else if(hash == hash_list && strcmp(tok, "list") == 0) {
+                    // OLD API
+                    code = 200;
+
+                    debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
+
+                    buffer_flush(w->response.data);
+                    RRDSET *st = localhost.rrdset_root;
+
+                    for ( ; st ; st = st->next )
+                        buffer_sprintf(w->response.data, "%s\n", st->name);
+                }
+                else if(hash == hash_all_json && strcmp(tok, "all.json") == 0) {
+                    // OLD API
+                    code = 200;
+                    debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
+
+                    w->response.data->contenttype = CT_APPLICATION_JSON;
+                    buffer_flush(w->response.data);
+                    rrd_stats_all_json(w->response.data);
+                }
 #ifdef NETDATA_INTERNAL_CHECKS
-				else if(strcmp(tok, "exit") == 0) {
-					code = 200;
-					w->response.data->contenttype = CT_TEXT_PLAIN;
-					buffer_flush(w->response.data);
-
-					if(!netdata_exit)
-						buffer_strcat(w->response.data, "ok, will do...");
-					else
-						buffer_strcat(w->response.data, "I am doing it already");
-
-					netdata_exit = 1;
-				}
-				else if(strcmp(tok, "debug") == 0) {
-					buffer_flush(w->response.data);
-
-					// get the name of the data to show
-					tok = mystrsep(&url, "/?&");
-					if(tok && *tok) {
-						debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
-
-						// do we have such a data set?
-						RRDSET *st = rrdset_find_byname(tok);
-						if(!st) st = rrdset_find(tok);
-						if(!st) {
-							code = 404;
-							buffer_sprintf(w->response.data, "Chart %s is not found.\r\n", tok);
-							debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
-						}
-						else {
-							code = 200;
-							debug_flags |= D_RRD_STATS;
-							st->debug = !st->debug;
-							buffer_sprintf(w->response.data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
-							debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
-						}
-					}
-					else {
-						code = 500;
-						buffer_flush(w->response.data);
-						buffer_strcat(w->response.data, "debug which chart?\r\n");
-					}
-				}
-				else if(strcmp(tok, "mirror") == 0) {
-					code = 200;
-
-					debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
-
-					// replace the zero bytes with spaces
-					buffer_char_replace(w->response.data, '\0', ' ');
-
-					// just leave the buffer as is
-					// it will be copied back to the client
-				}
-#endif	/* NETDATA_INTERNAL_CHECKS */
-				else {
-					char filename[FILENAME_MAX+1];
-					url = filename;
-					strncpyz(filename, w->last_url, FILENAME_MAX);
-					tok = mystrsep(&url, "?");
-					buffer_flush(w->response.data);
-					code = mysendfile(w, (tok && *tok)?tok:"/");
-				}
-			}
-			else {
-				char filename[FILENAME_MAX+1];
-				url = filename;
-				strncpyz(filename, w->last_url, FILENAME_MAX);
-				tok = mystrsep(&url, "?");
-				buffer_flush(w->response.data);
-				code = mysendfile(w, (tok && *tok)?tok:"/");
-			}
-		}
-	}
-
-	gettimeofday(&w->tv_ready, NULL);
-	w->response.data->date = time(NULL);
-	w->response.sent = 0;
-	w->response.code = code;
-
-	// prepare the HTTP response header
-	debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
-
-	char *content_type_string;
-	switch(w->response.data->contenttype) {
-		case CT_TEXT_HTML:
-			content_type_string = "text/html; charset=utf-8";
-			break;
-
-		case CT_APPLICATION_XML:
-			content_type_string = "application/xml; charset=utf-8";
-			break;
-
-		case CT_APPLICATION_JSON:
-			content_type_string = "application/json; charset=utf-8";
-			break;
-
-		case CT_APPLICATION_X_JAVASCRIPT:
-			content_type_string = "application/x-javascript; charset=utf-8";
-			break;
-
-		case CT_TEXT_CSS:
-			content_type_string = "text/css; charset=utf-8";
-			break;
-
-		case CT_TEXT_XML:
-			content_type_string = "text/xml; charset=utf-8";
-			break;
-
-		case CT_TEXT_XSL:
-			content_type_string = "text/xsl; charset=utf-8";
-			break;
-
-		case CT_APPLICATION_OCTET_STREAM:
-			content_type_string = "application/octet-stream";
-			break;
-
-		case CT_IMAGE_SVG_XML:
-			content_type_string = "image/svg+xml";
-			break;
-
-		case CT_APPLICATION_X_FONT_TRUETYPE:
-			content_type_string = "application/x-font-truetype";
-			break;
-
-		case CT_APPLICATION_X_FONT_OPENTYPE:
-			content_type_string = "application/x-font-opentype";
-			break;
-
-		case CT_APPLICATION_FONT_WOFF:
-			content_type_string = "application/font-woff";
-			break;
-
-		case CT_APPLICATION_FONT_WOFF2:
-			content_type_string = "application/font-woff2";
-			break;
-
-		case CT_APPLICATION_VND_MS_FONTOBJ:
-			content_type_string = "application/vnd.ms-fontobject";
-			break;
-
-		case CT_IMAGE_PNG:
-			content_type_string = "image/png";
-			break;
-
-		case CT_IMAGE_JPG:
-			content_type_string = "image/jpeg";
-			break;
-
-		case CT_IMAGE_GIF:
-			content_type_string = "image/gif";
-			break;
-
-		case CT_IMAGE_XICON:
-			content_type_string = "image/x-icon";
-			break;
-
-		case CT_IMAGE_BMP:
-			content_type_string = "image/bmp";
-			break;
-
-		case CT_IMAGE_ICNS:
-			content_type_string = "image/icns";
-			break;
-
-		default:
-		case CT_TEXT_PLAIN:
-			content_type_string = "text/plain; charset=utf-8";
-			break;
-	}
-
-	char *code_msg;
-	switch(code) {
-		case 200:
-			code_msg = "OK";
-			break;
-
-		case 307:
-			code_msg = "Temporary Redirect";
-			break;
-
-		case 400:
-			code_msg = "Bad Request";
-			break;
-
-		case 403:
-			code_msg = "Forbidden";
-			break;
-
-		case 404:
-			code_msg = "Not Found";
-			break;
-
-		case 412:
-			code_msg = "Preconditions Failed";
-			break;
-
-		default:
-			code_msg = "Internal Server Error";
-			break;
-	}
-
-	char date[100];
-	struct tm tmbuf, *tm = gmtime_r(&w->response.data->date, &tmbuf);
-	strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", tm);
-
-	buffer_sprintf(w->response.header_output,
-		"HTTP/1.1 %d %s\r\n"
-		"Connection: %s\r\n"
-		"Server: NetData Embedded HTTP Server\r\n"
-		"Access-Control-Allow-Origin: %s\r\n"
-		"Access-Control-Allow-Credentials: true\r\n"
-		"Content-Type: %s\r\n"
-		"Date: %s\r\n"
-		, code, code_msg
-		, w->keepalive?"keep-alive":"close"
-		, w->origin
-		, content_type_string
-		, date
-		);
-
-	if(w->cookie1[0]) {
-		buffer_sprintf(w->response.header_output,
-		   "Set-Cookie: %s\r\n",
-		   w->cookie1);
-	}
-
-	if(w->cookie2[0]) {
-		buffer_sprintf(w->response.header_output,
-		   "Set-Cookie: %s\r\n",
-		   w->cookie2);
-	}
-
-	if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
-		buffer_strcat(w->response.header_output,
-			"Access-Control-Allow-Methods: GET, OPTIONS\r\n"
-			"Access-Control-Allow-Headers: accept, x-requested-with, origin, content-type, cookie\r\n"
-			"Access-Control-Max-Age: 1209600\r\n" // 86400 * 14
-			);
-	}
-
-	if(buffer_strlen(w->response.header))
-		buffer_strcat(w->response.header_output, buffer_tostring(w->response.header));
-
-	if(w->mode == WEB_CLIENT_MODE_NORMAL && (w->response.data->options & WB_CONTENT_NO_CACHEABLE)) {
-		buffer_sprintf(w->response.header_output,
-			"Expires: %s\r\n"
-			"Cache-Control: no-cache\r\n"
-			, date);
-	}
-	else if(w->mode != WEB_CLIENT_MODE_OPTIONS) {
-		char edate[100];
-		time_t et = w->response.data->date + (86400 * 14);
-		struct tm etmbuf, *etm = gmtime_r(&et, &etmbuf);
-		strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", etm);
-
-		buffer_sprintf(w->response.header_output,
-			"Expires: %s\r\n"
-			"Cache-Control: public\r\n"
-			, edate);
-	}
-
-	// if we know the content length, put it
-	if(!w->response.zoutput && (w->response.data->len || w->response.rlen))
-		buffer_sprintf(w->response.header_output,
-			"Content-Length: %ld\r\n"
-			, w->response.data->len? w->response.data->len: w->response.rlen
-			);
-	else if(!w->response.zoutput)
-		w->keepalive = 0;	// content-length is required for keep-alive
-
-	if(w->response.zoutput) {
-		buffer_strcat(w->response.header_output,
-			"Content-Encoding: gzip\r\n"
-			"Transfer-Encoding: chunked\r\n"
-			);
-	}
-
-	buffer_strcat(w->response.header_output, "\r\n");
-
-	// disable TCP_NODELAY, to buffer the header
-	int flag = 0;
-	if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0)
-		error("%llu: failed to disable TCP_NODELAY on socket.", w->id);
-
-	// sent the HTTP header
-	debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %d: '%s'"
-			, w->id
-			, buffer_strlen(w->response.header_output)
-			, buffer_tostring(w->response.header_output)
-			);
-
-	bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0);
-	if(bytes != (ssize_t) buffer_strlen(w->response.header_output))
-		error("%llu: HTTP Header failed to be sent (I sent %d bytes but the system sent %d bytes)."
-				, w->id
-				, buffer_strlen(w->response.header_output)
-				, bytes);
-	else {
-		global_statistics_lock();
-		global_statistics.bytes_sent += bytes;
-		global_statistics_unlock();
-	}
-
-	// enable TCP_NODELAY, to send all data immediately at the next send()
-	flag = 1;
-	if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0) error("%llu: failed to enable TCP_NODELAY on socket.", w->id);
-
-	// enable sending immediately if we have data
-	if(w->response.data->len) w->wait_send = 1;
-	else w->wait_send = 0;
-
-	// pretty logging
-	switch(w->mode) {
-		case WEB_CLIENT_MODE_OPTIONS:
-			debug(D_WEB_CLIENT, "%llu: Done preparing the OPTIONS response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
-			break;
-
-		case WEB_CLIENT_MODE_NORMAL:
-			debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
-			break;
-
-		case WEB_CLIENT_MODE_FILECOPY:
-			if(w->response.rlen) {
-				debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %d bytes to client.", w->id, w->response.rlen);
-				w->wait_receive = 1;
-
-				/*
-				// utilize the kernel sendfile() for copying the file to the socket.
-				// this block of code can be commented, without anything missing.
-				// when it is commented, the program will copy the data using async I/O.
-				{
-					long len = sendfile(w->ofd, w->ifd, NULL, w->response.data->rbytes);
-					if(len != w->response.data->rbytes) error("%llu: sendfile() should copy %ld bytes, but copied %ld. Falling back to manual copy.", w->id, w->response.data->rbytes, len);
-					else web_client_reset(w);
-				}
-				*/
-			}
-			else
-				debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
-			break;
-
-		default:
-			fatal("%llu: Unknown client mode %d.", w->id, w->mode);
-			break;
-	}
+                else if(hash == hash_exit && strcmp(tok, "exit") == 0) {
+                    code = 200;
+                    w->response.data->contenttype = CT_TEXT_PLAIN;
+                    buffer_flush(w->response.data);
+
+                    if(!netdata_exit)
+                        buffer_strcat(w->response.data, "ok, will do...");
+                    else
+                        buffer_strcat(w->response.data, "I am doing it already");
+
+                    error("web request to exit received.");
+                    netdata_cleanup_and_exit(0);
+                    netdata_exit = 1;
+                }
+                else if(hash == hash_debug && strcmp(tok, "debug") == 0) {
+                    buffer_flush(w->response.data);
+
+                    // get the name of the data to show
+                    tok = mystrsep(&url, "/?&");
+                    if(tok && *tok) {
+                        debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
+
+                        // do we have such a data set?
+                        RRDSET *st = rrdset_find_byname(tok);
+                        if(!st) st = rrdset_find(tok);
+                        if(!st) {
+                            code = 404;
+                            buffer_sprintf(w->response.data, "Chart %s is not found.\r\n", tok);
+                            debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
+                        }
+                        else {
+                            code = 200;
+                            debug_flags |= D_RRD_STATS;
+                            st->debug = !st->debug;
+                            buffer_sprintf(w->response.data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
+                            debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
+                        }
+                    }
+                    else {
+                        code = 500;
+                        buffer_flush(w->response.data);
+                        buffer_strcat(w->response.data, "debug which chart?\r\n");
+                    }
+                }
+                else if(hash == hash_mirror && strcmp(tok, "mirror") == 0) {
+                    code = 200;
+
+                    debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
+
+                    // replace the zero bytes with spaces
+                    buffer_char_replace(w->response.data, '\0', ' ');
+
+                    // just leave the buffer as is
+                    // it will be copied back to the client
+                }
+#endif  /* NETDATA_INTERNAL_CHECKS */
+                else {
+                    char filename[FILENAME_MAX+1];
+                    url = filename;
+                    strncpyz(filename, w->last_url, FILENAME_MAX);
+                    tok = mystrsep(&url, "?");
+                    buffer_flush(w->response.data);
+                    code = mysendfile(w, (tok && *tok)?tok:"/");
+                }
+            }
+            else {
+                char filename[FILENAME_MAX+1];
+                url = filename;
+                strncpyz(filename, w->last_url, FILENAME_MAX);
+                tok = mystrsep(&url, "?");
+                buffer_flush(w->response.data);
+                code = mysendfile(w, (tok && *tok)?tok:"/");
+            }
+        }
+    }
+
+    gettimeofday(&w->tv_ready, NULL);
+    w->response.data->date = time(NULL);
+    w->response.sent = 0;
+    w->response.code = code;
+
+    // prepare the HTTP response header
+    debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
+
+    const char *content_type_string = web_content_type_to_string(w->response.data->contenttype);
+    const char *code_msg = web_response_code_to_string(code);
+
+    char date[32];
+    struct tm tmbuf, *tm = gmtime_r(&w->response.data->date, &tmbuf);
+    strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", tm);
+
+    buffer_sprintf(w->response.header_output,
+        "HTTP/1.1 %d %s\r\n"
+        "Connection: %s\r\n"
+        "Server: NetData Embedded HTTP Server\r\n"
+        "Access-Control-Allow-Origin: %s\r\n"
+        "Access-Control-Allow-Credentials: true\r\n"
+        "Content-Type: %s\r\n"
+        "Date: %s\r\n"
+        , code, code_msg
+        , w->keepalive?"keep-alive":"close"
+        , w->origin
+        , content_type_string
+        , date
+        );
+
+    if(w->cookie1[0] || w->cookie2[0]) {
+        if(w->cookie1[0]) {
+            buffer_sprintf(w->response.header_output,
+               "Set-Cookie: %s\r\n",
+               w->cookie1);
+        }
+
+        if(w->cookie2[0]) {
+            buffer_sprintf(w->response.header_output,
+               "Set-Cookie: %s\r\n",
+               w->cookie2);
+        }
+
+        if(web_donotrack_comply)
+            buffer_sprintf(w->response.header_output,
+               "Tk: T;cookies\r\n");
+    }
+    else {
+        if(web_donotrack_comply) {
+            if(w->tracking_required)
+                buffer_sprintf(w->response.header_output,
+                   "Tk: T;cookies\r\n");
+            else
+                buffer_sprintf(w->response.header_output,
+                   "Tk: N\r\n");
+        }
+    }
+
+    if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
+        buffer_strcat(w->response.header_output,
+            "Access-Control-Allow-Methods: GET, OPTIONS\r\n"
+            "Access-Control-Allow-Headers: accept, x-requested-with, origin, content-type, cookie\r\n"
+            "Access-Control-Max-Age: 1209600\r\n" // 86400 * 14
+            );
+    }
+
+    if(buffer_strlen(w->response.header))
+        buffer_strcat(w->response.header_output, buffer_tostring(w->response.header));
+
+    if(w->mode == WEB_CLIENT_MODE_NORMAL && (w->response.data->options & WB_CONTENT_NO_CACHEABLE)) {
+        buffer_sprintf(w->response.header_output,
+            "Expires: %s\r\n"
+            "Cache-Control: no-cache\r\n"
+            , date);
+    }
+    else if(w->mode != WEB_CLIENT_MODE_OPTIONS) {
+        char edate[32];
+        time_t et = w->response.data->date + (86400 * 14);
+        struct tm etmbuf, *etm = gmtime_r(&et, &etmbuf);
+        strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", etm);
+
+        buffer_sprintf(w->response.header_output,
+            "Expires: %s\r\n"
+            "Cache-Control: public\r\n"
+            , edate);
+    }
+
+    // if we know the content length, put it
+    if(!w->response.zoutput && (w->response.data->len || w->response.rlen))
+        buffer_sprintf(w->response.header_output,
+            "Content-Length: %zu\r\n"
+            , w->response.data->len? w->response.data->len: w->response.rlen
+            );
+    else if(!w->response.zoutput)
+        w->keepalive = 0;   // content-length is required for keep-alive
+
+    if(w->response.zoutput) {
+        buffer_strcat(w->response.header_output,
+            "Content-Encoding: gzip\r\n"
+            "Transfer-Encoding: chunked\r\n"
+            );
+    }
+
+    buffer_strcat(w->response.header_output, "\r\n");
+
+    // sent the HTTP header
+    debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %zu: '%s'"
+            , w->id
+            , buffer_strlen(w->response.header_output)
+            , buffer_tostring(w->response.header_output)
+            );
+
+    web_client_crock_socket(w);
+
+    bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0);
+    if(bytes != (ssize_t) buffer_strlen(w->response.header_output)) {
+        if(bytes > 0)
+            w->stats_sent_bytes += bytes;
+
+        debug(D_WEB_CLIENT, "%llu: HTTP Header failed to be sent (I sent %zu bytes but the system sent %zd bytes). Closing web client."
+            , w->id
+            , buffer_strlen(w->response.header_output)
+            , bytes);
+
+        WEB_CLIENT_IS_DEAD(w);
+        return;
+    }
+    else 
+        w->stats_sent_bytes += bytes;
+
+    // enable sending immediately if we have data
+    if(w->response.data->len) w->wait_send = 1;
+    else w->wait_send = 0;
+
+    // pretty logging
+    switch(w->mode) {
+        case WEB_CLIENT_MODE_OPTIONS:
+            debug(D_WEB_CLIENT, "%llu: Done preparing the OPTIONS response. Sending data (%zu bytes) to client.", w->id, w->response.data->len);
+            break;
+
+        case WEB_CLIENT_MODE_NORMAL:
+            debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%zu bytes) to client.", w->id, w->response.data->len);
+            break;
+
+        case WEB_CLIENT_MODE_FILECOPY:
+            if(w->response.rlen) {
+                debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %zu bytes to client.", w->id, w->response.rlen);
+                w->wait_receive = 1;
+
+                /*
+                // utilize the kernel sendfile() for copying the file to the socket.
+                // this block of code can be commented, without anything missing.
+                // when it is commented, the program will copy the data using async I/O.
+                {
+                    long len = sendfile(w->ofd, w->ifd, NULL, w->response.data->rbytes);
+                    if(len != w->response.data->rbytes)
+                        error("%llu: sendfile() should copy %ld bytes, but copied %ld. Falling back to manual copy.", w->id, w->response.data->rbytes, len);
+                    else
+                        web_client_reset(w);
+                }
+                */
+            }
+            else
+                debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
+            break;
+
+        default:
+            fatal("%llu: Unknown client mode %d.", w->id, w->mode);
+            break;
+    }
 }
 
-long web_client_send_chunk_header(struct web_client *w, long len)
+ssize_t web_client_send_chunk_header(struct web_client *w, size_t len)
 {
-	debug(D_DEFLATE, "%llu: OPEN CHUNK of %d bytes (hex: %x).", w->id, len, len);
-	char buf[1024];
-	sprintf(buf, "%lX\r\n", len);
-	ssize_t bytes = send(w->ofd, buf, strlen(buf), MSG_DONTWAIT);
-
-	if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk header %d bytes.", w->id, bytes);
-	else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk header to the client.", w->id);
-	else debug(D_DEFLATE, "%llu: Failed to send chunk header to client.", w->id);
-
-	return bytes;
+    debug(D_DEFLATE, "%llu: OPEN CHUNK of %zu bytes (hex: %zx).", w->id, len, len);
+    char buf[24];
+    sprintf(buf, "%zX\r\n", len);
+    
+    ssize_t bytes = send(w->ofd, buf, strlen(buf), 0);
+    if(bytes > 0) {
+        debug(D_DEFLATE, "%llu: Sent chunk header %zd bytes.", w->id, bytes);
+        w->stats_sent_bytes += bytes;
+    }
+
+    else if(bytes == 0) {
+        debug(D_WEB_CLIENT, "%llu: Did not send chunk header to the client.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+    else {
+        debug(D_WEB_CLIENT, "%llu: Failed to send chunk header to client.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+
+    return bytes;
 }
 
-long web_client_send_chunk_close(struct web_client *w)
+ssize_t web_client_send_chunk_close(struct web_client *w)
 {
-	//debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
-
-	ssize_t bytes = send(w->ofd, "\r\n", 2, MSG_DONTWAIT);
-
-	if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
-	else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk suffix to the client.", w->id);
-	else debug(D_DEFLATE, "%llu: Failed to send chunk suffix to client.", w->id);
-
-	return bytes;
+    //debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
+
+    ssize_t bytes = send(w->ofd, "\r\n", 2, 0);
+    if(bytes > 0) {
+        debug(D_DEFLATE, "%llu: Sent chunk suffix %zd bytes.", w->id, bytes);
+        w->stats_sent_bytes += bytes;
+    }
+
+    else if(bytes == 0) {
+        debug(D_WEB_CLIENT, "%llu: Did not send chunk suffix to the client.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+    else {
+        debug(D_WEB_CLIENT, "%llu: Failed to send chunk suffix to client.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+
+    return bytes;
 }
 
-long web_client_send_chunk_finalize(struct web_client *w)
+ssize_t web_client_send_chunk_finalize(struct web_client *w)
 {
-	//debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
-
-	ssize_t bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, MSG_DONTWAIT);
-
-	if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
-	else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk suffix to the client.", w->id);
-	else debug(D_DEFLATE, "%llu: Failed to send chunk suffix to client.", w->id);
-
-	return bytes;
+    //debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
+
+    ssize_t bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, 0);
+    if(bytes > 0) {
+        debug(D_DEFLATE, "%llu: Sent chunk suffix %zd bytes.", w->id, bytes);
+        w->stats_sent_bytes += bytes;
+    }
+
+    else if(bytes == 0) {
+        debug(D_WEB_CLIENT, "%llu: Did not send chunk finalize suffix to the client.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+    else {
+        debug(D_WEB_CLIENT, "%llu: Failed to send chunk finalize suffix to client.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+
+    return bytes;
 }
 
 #ifdef NETDATA_WITH_ZLIB
-long web_client_send_deflate(struct web_client *w)
+ssize_t web_client_send_deflate(struct web_client *w)
 {
-	long len = 0, t = 0;
-
-	// when using compression,
-	// w->response.sent is the amount of bytes passed through compression
-
-	debug(D_DEFLATE, "%llu: web_client_send_deflate(): w->response.data->len = %d, w->response.sent = %d, w->response.zhave = %d, w->response.zsent = %d, w->response.zstream.avail_in = %d, w->response.zstream.avail_out = %d, w->response.zstream.total_in = %d, w->response.zstream.total_out = %d.", w->id, w->response.data->len, w->response.sent, w->response.zhave, w->response.zsent, w->response.zstream.avail_in, w->response.zstream.avail_out, w->response.zstream.total_in, w->response.zstream.total_out);
-
-	if(w->response.data->len - w->response.sent == 0 && w->response.zstream.avail_in == 0 && w->response.zhave == w->response.zsent && w->response.zstream.avail_out != 0) {
-		// there is nothing to send
-
-		debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
-
-		// finalize the chunk
-		if(w->response.sent != 0)
-			t += web_client_send_chunk_finalize(w);
-
-		// there can be two cases for this
-		// A. we have done everything
-		// B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
-
-		if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->ifd != w->ofd && w->response.rlen && w->response.rlen > w->response.data->len) {
-			// we have to wait, more data will come
-			debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
-			w->wait_send = 0;
-			return(0);
-		}
-
-		if(w->keepalive == 0) {
-			debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
-			errno = 0;
-			return(-1);
-		}
-
-		// reset the client
-		web_client_reset(w);
-		debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
-		return(0);
-	}
-
-	if(w->response.zhave == w->response.zsent) {
-		// compress more input data
-
-		// close the previous open chunk
-		if(w->response.sent != 0) t += web_client_send_chunk_close(w);
-
-		debug(D_DEFLATE, "%llu: Compressing %d new bytes starting from %d (and %d left behind).", w->id, (w->response.data->len - w->response.sent), w->response.sent, w->response.zstream.avail_in);
-
-		// give the compressor all the data not passed through the compressor yet
-		if(w->response.data->len > w->response.sent) {
-#ifdef NETDATA_INTERNAL_CHECKS
-			if((long)w->response.sent - (long)w->response.zstream.avail_in < 0)
-				error("internal error: avail_in is corrupted.");
-#endif
-			w->response.zstream.next_in = (Bytef *)&w->response.data->buffer[w->response.sent - w->response.zstream.avail_in];
-			w->response.zstream.avail_in += (uInt) (w->response.data->len - w->response.sent);
-		}
-
-		// reset the compressor output buffer
-		w->response.zstream.next_out = w->response.zbuffer;
-		w->response.zstream.avail_out = ZLIB_CHUNK;
-
-		// ask for FINISH if we have all the input
-		int flush = Z_SYNC_FLUSH;
-		if(w->mode == WEB_CLIENT_MODE_NORMAL
-			|| (w->mode == WEB_CLIENT_MODE_FILECOPY && !w->wait_receive && w->response.data->len == w->response.rlen)) {
-			flush = Z_FINISH;
-			debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
-		}
-		else {
-			debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
-		}
-
-		// compress
-		if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
-			error("%llu: Compression failed. Closing down client.", w->id);
-			web_client_reset(w);
-			return(-1);
-		}
-
-		w->response.zhave = ZLIB_CHUNK - w->response.zstream.avail_out;
-		w->response.zsent = 0;
-
-		// keep track of the bytes passed through the compressor
-		w->response.sent = w->response.data->len;
-
-		debug(D_DEFLATE, "%llu: Compression produced %d bytes.", w->id, w->response.zhave);
-
-		// open a new chunk
-		t += web_client_send_chunk_header(w, w->response.zhave);
-	}
-	
-	debug(D_WEB_CLIENT, "%llu: Sending %d bytes of data (+%d of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
-
-	len = send(w->ofd, &w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
-	if(len > 0) {
-		w->response.zsent += len;
-		if(t > 0) len += t;
-		debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, len);
-	}
-	else if(len == 0) debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client (zhave = %ld, zsent = %ld, need to send = %ld).", w->id, w->response.zhave, w->response.zsent, w->response.zhave - w->response.zsent);
-	else debug(D_WEB_CLIENT, "%llu: Failed to send data to client. Reason: %s", w->id, strerror(errno));
-
-	return(len);
+    ssize_t len = 0, t = 0;
+
+    // when using compression,
+    // w->response.sent is the amount of bytes passed through compression
+
+    debug(D_DEFLATE, "%llu: web_client_send_deflate(): w->response.data->len = %zu, w->response.sent = %zu, w->response.zhave = %zu, w->response.zsent = %zu, w->response.zstream.avail_in = %u, w->response.zstream.avail_out = %u, w->response.zstream.total_in = %lu, w->response.zstream.total_out = %lu.",
+        w->id, w->response.data->len, w->response.sent, w->response.zhave, w->response.zsent, w->response.zstream.avail_in, w->response.zstream.avail_out, w->response.zstream.total_in, w->response.zstream.total_out);
+
+    if(w->response.data->len - w->response.sent == 0 && w->response.zstream.avail_in == 0 && w->response.zhave == w->response.zsent && w->response.zstream.avail_out != 0) {
+        // there is nothing to send
+
+        debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
+
+        // finalize the chunk
+        if(w->response.sent != 0) {
+            t = web_client_send_chunk_finalize(w);
+            if(t < 0) return t;
+        }
+
+        if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
+            // we have to wait, more data will come
+            debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
+            w->wait_send = 0;
+            return t;
+        }
+
+        if(unlikely(!w->keepalive)) {
+            debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %zu bytes sent.", w->id, w->response.sent);
+            WEB_CLIENT_IS_DEAD(w);
+            return t;
+        }
+
+        // reset the client
+        web_client_reset(w);
+        debug(D_WEB_CLIENT, "%llu: Done sending all data on socket.", w->id);
+        return t;
+    }
+
+    if(w->response.zhave == w->response.zsent) {
+        // compress more input data
+
+        // close the previous open chunk
+        if(w->response.sent != 0) {
+            t = web_client_send_chunk_close(w);
+            if(t < 0) return t;
+        }
+
+        debug(D_DEFLATE, "%llu: Compressing %zu new bytes starting from %zu (and %u left behind).", w->id, (w->response.data->len - w->response.sent), w->response.sent, w->response.zstream.avail_in);
+
+        // give the compressor all the data not passed through the compressor yet
+        if(w->response.data->len > w->response.sent) {
+            w->response.zstream.next_in = (Bytef *)&w->response.data->buffer[w->response.sent - w->response.zstream.avail_in];
+            w->response.zstream.avail_in += (uInt) (w->response.data->len - w->response.sent);
+        }
+
+        // reset the compressor output buffer
+        w->response.zstream.next_out = w->response.zbuffer;
+        w->response.zstream.avail_out = ZLIB_CHUNK;
+
+        // ask for FINISH if we have all the input
+        int flush = Z_SYNC_FLUSH;
+        if(w->mode == WEB_CLIENT_MODE_NORMAL
+            || (w->mode == WEB_CLIENT_MODE_FILECOPY && !w->wait_receive && w->response.data->len == w->response.rlen)) {
+            flush = Z_FINISH;
+            debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
+        }
+        else {
+            debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
+        }
+
+        // compress
+        if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
+            error("%llu: Compression failed. Closing down client.", w->id);
+            web_client_reset(w);
+            return(-1);
+        }
+
+        w->response.zhave = ZLIB_CHUNK - w->response.zstream.avail_out;
+        w->response.zsent = 0;
+
+        // keep track of the bytes passed through the compressor
+        w->response.sent = w->response.data->len;
+
+        debug(D_DEFLATE, "%llu: Compression produced %zu bytes.", w->id, w->response.zhave);
+
+        // open a new chunk
+        ssize_t t2 = web_client_send_chunk_header(w, w->response.zhave);
+        if(t2 < 0) return t2;
+        t += t2;
+    }
+    
+    debug(D_WEB_CLIENT, "%llu: Sending %zu bytes of data (+%zd of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
+
+    len = send(w->ofd, &w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
+    if(len > 0) {
+        w->stats_sent_bytes += len;
+        w->response.zsent += len;
+        len += t;
+        debug(D_WEB_CLIENT, "%llu: Sent %zd bytes.", w->id, len);
+    }
+    else if(len == 0) {
+        debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client (zhave = %zu, zsent = %zu, need to send = %zu).",
+            w->id, w->response.zhave, w->response.zsent, w->response.zhave - w->response.zsent);
+
+        WEB_CLIENT_IS_DEAD(w);
+    }
+    else {
+        debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+
+    return(len);
 }
 #endif // NETDATA_WITH_ZLIB
 
-long web_client_send(struct web_client *w)
-{
+ssize_t web_client_send(struct web_client *w) {
 #ifdef NETDATA_WITH_ZLIB
-	if(likely(w->response.zoutput)) return web_client_send_deflate(w);
+    if(likely(w->response.zoutput)) return web_client_send_deflate(w);
 #endif // NETDATA_WITH_ZLIB
 
-	long bytes;
-
-	if(unlikely(w->response.data->len - w->response.sent == 0)) {
-		// there is nothing to send
-
-		debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
-
-		// there can be two cases for this
-		// A. we have done everything
-		// B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
-
-		if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->ifd != w->ofd && w->response.rlen && w->response.rlen > w->response.data->len) {
-			// we have to wait, more data will come
-			debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
-			w->wait_send = 0;
-			return(0);
-		}
-
-		if(unlikely(w->keepalive == 0)) {
-			debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
-			errno = 0;
-			return(-1);
-		}
-
-		web_client_reset(w);
-		debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
-		return(0);
-	}
-
-	bytes = send(w->ofd, &w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
-	if(likely(bytes > 0)) {
-		w->response.sent += bytes;
-		debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
-	}
-	else if(likely(bytes == 0)) debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
-	else debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
-
-	return(bytes);
+    ssize_t bytes;
+
+    if(unlikely(w->response.data->len - w->response.sent == 0)) {
+        // there is nothing to send
+
+        debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
+
+        // there can be two cases for this
+        // A. we have done everything
+        // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
+
+        if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
+            // we have to wait, more data will come
+            debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
+            w->wait_send = 0;
+            return 0;
+        }
+
+        if(unlikely(!w->keepalive)) {
+            debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %zu bytes sent.", w->id, w->response.sent);
+            WEB_CLIENT_IS_DEAD(w);
+            return 0;
+        }
+
+        web_client_reset(w);
+        debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
+        return 0;
+    }
+
+    bytes = send(w->ofd, &w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
+    if(likely(bytes > 0)) {
+        w->stats_sent_bytes += bytes;
+        w->response.sent += bytes;
+        debug(D_WEB_CLIENT, "%llu: Sent %zd bytes.", w->id, bytes);
+    }
+    else if(likely(bytes == 0)) {
+        debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+    else {
+        debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+
+    return(bytes);
 }
 
-long web_client_receive(struct web_client *w)
+ssize_t web_client_receive(struct web_client *w)
 {
-	// do we have any space for more data?
-	buffer_need_bytes(w->response.data, WEB_REQUEST_LENGTH);
-
-	long left = w->response.data->size - w->response.data->len;
-	long bytes;
-
-	if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
-		bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1));
-	else
-		bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
-
-	if(likely(bytes > 0)) {
-		size_t old = w->response.data->len;
-		w->response.data->len += bytes;
-		w->response.data->buffer[w->response.data->len] = '\0';
-
-		debug(D_WEB_CLIENT, "%llu: Received %d bytes.", w->id, bytes);
-		debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
-
-		if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
-			w->wait_send = 1;
-			if(w->response.rlen && w->response.data->len >= w->response.rlen) w->wait_receive = 0;
-		}
-	}
-	else if(likely(bytes == 0)) {
-		debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
-
-		// if we cannot read, it means we have an error on input.
-		// if however, we are copying a file from ifd to ofd, we should not return an error.
-		// in this case, the error should be generated when the file has been sent to the client.
-
-		if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
-			// we are copying data from ifd to ofd
-			// let it finish copying...
-			w->wait_receive = 0;
-			debug(D_WEB_CLIENT, "%llu: Disabling input.", w->id);
-		}
-		else {
-			bytes = -1;
-			errno = 0;
-		}
-	}
-
-	return(bytes);
+    // do we have any space for more data?
+    buffer_need_bytes(w->response.data, WEB_REQUEST_LENGTH);
+
+    ssize_t left = w->response.data->size - w->response.data->len;
+    ssize_t bytes;
+
+    if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
+        bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1));
+    else
+        bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
+
+    if(likely(bytes > 0)) {
+        if(w->mode != WEB_CLIENT_MODE_FILECOPY)
+            w->stats_received_bytes += bytes;
+
+        size_t old = w->response.data->len;
+        w->response.data->len += bytes;
+        w->response.data->buffer[w->response.data->len] = '\0';
+
+        debug(D_WEB_CLIENT, "%llu: Received %zd bytes.", w->id, bytes);
+        debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
+
+        if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
+            w->wait_send = 1;
+
+            if(w->response.rlen && w->response.data->len >= w->response.rlen)
+                w->wait_receive = 0;
+        }
+    }
+    else if(likely(bytes == 0)) {
+        debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
+
+        // if we cannot read, it means we have an error on input.
+        // if however, we are copying a file from ifd to ofd, we should not return an error.
+        // in this case, the error should be generated when the file has been sent to the client.
+
+        if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
+            // we are copying data from ifd to ofd
+            // let it finish copying...
+            w->wait_receive = 0;
+
+            debug(D_WEB_CLIENT, "%llu: Read the whole file.", w->id);
+            if(w->ifd != w->ofd) close(w->ifd);
+            w->ifd = w->ofd;
+        }
+        else {
+            debug(D_WEB_CLIENT, "%llu: failed to receive data.", w->id);
+            WEB_CLIENT_IS_DEAD(w);
+        }
+    }
+    else {
+        debug(D_WEB_CLIENT, "%llu: receive data failed.", w->id);
+        WEB_CLIENT_IS_DEAD(w);
+    }
+
+    return(bytes);
 }
 
 
@@ -2040,104 +2545,131 @@ long web_client_receive(struct web_client *w)
 
 void *web_client_main(void *ptr)
 {
-	if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
-		error("Cannot set pthread cancel type to DEFERRED.");
-
-	if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
-		error("Cannot set pthread cancel state to ENABLE.");
-
-	struct timeval tv;
-	struct web_client *w = ptr;
-	int retval;
-	fd_set ifds, ofds, efds;
-	int fdmax = 0;
-
-	log_access("%llu: %s port %s connected on thread task id %d", w->id, w->client_ip, w->client_port, gettid());
-
-	for(;;) {
-		FD_ZERO (&ifds);
-		FD_ZERO (&ofds);
-		FD_ZERO (&efds);
-
-		FD_SET(w->ifd, &efds);
-
-		if(w->ifd != w->ofd)
-			FD_SET(w->ofd, &efds);
-
-		if (w->wait_receive) {
-			FD_SET(w->ifd, &ifds);
-			if(w->ifd > fdmax) fdmax = w->ifd;
-		}
-
-		if (w->wait_send) {
-			FD_SET(w->ofd, &ofds);
-			if(w->ofd > fdmax) fdmax = w->ofd;
-		}
-
-		tv.tv_sec = web_client_timeout;
-		tv.tv_usec = 0;
-
-		debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
-		retval = select(fdmax+1, &ifds, &ofds, &efds, &tv);
-
-		if(retval == -1) {
-			debug(D_WEB_CLIENT_ACCESS, "%llu: LISTENER: select() failed.", w->id);
-			continue;
-		}
-		else if(!retval) {
-			// timeout
-			debug(D_WEB_CLIENT_ACCESS, "%llu: LISTENER: timeout.", w->id);
-			break;
-		}
-
-		if(FD_ISSET(w->ifd, &efds)) {
-			debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on input socket.", w->id);
-			break;
-		}
-
-		if(FD_ISSET(w->ofd, &efds)) {
-			debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on output socket.", w->id);
-			break;
-		}
-
-		if(w->wait_send && FD_ISSET(w->ofd, &ofds)) {
-			long bytes;
-			if((bytes = web_client_send(w)) < 0) {
-				debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
-				errno = 0;
-				break;
-			}
-
-			global_statistics_lock();
-			global_statistics.bytes_sent += bytes;
-			global_statistics_unlock();
-		}
-
-		if(w->wait_receive && FD_ISSET(w->ifd, &ifds)) {
-			long bytes;
-			if((bytes = web_client_receive(w)) < 0) {
-				debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
-				errno = 0;
-				break;
-			}
-
-			if(w->mode == WEB_CLIENT_MODE_NORMAL) {
-				debug(D_WEB_CLIENT, "%llu: Attempting to process received data (%ld bytes).", w->id, bytes);
-				// info("%llu: Attempting to process received data (%ld bytes).", w->id, bytes);
-				web_client_process(w);
-			}
-
-			global_statistics_lock();
-			global_statistics.bytes_received += bytes;
-			global_statistics_unlock();
-		}
-	}
-
-	log_access("%llu: %s port %s disconnected from thread task id %d", w->id, w->client_ip, w->client_port, gettid());
-	debug(D_WEB_CLIENT, "%llu: done...", w->id);
-
-	web_client_reset(w);
-	w->obsolete = 1;
-
-	return NULL;
+    if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
+        error("Cannot set pthread cancel type to DEFERRED.");
+
+    if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
+        error("Cannot set pthread cancel state to ENABLE.");
+
+    struct web_client *w = ptr;
+    struct pollfd fds[2], *ifd, *ofd;
+    int retval, fdmax = 0, timeout;
+
+    log_access("%llu: %s port %s connected on thread task id %d", w->id, w->client_ip, w->client_port, gettid());
+
+    for(;;) {
+        if(unlikely(w->dead)) {
+            debug(D_WEB_CLIENT, "%llu: client is dead.", w->id);
+            break;
+        }
+        else if(unlikely(!w->wait_receive && !w->wait_send)) {
+            debug(D_WEB_CLIENT, "%llu: client is not set for neither receiving nor sending data.", w->id);
+            break;
+        }
+
+        if(unlikely(w->ifd < 0 || w->ofd < 0)) {
+            error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd", w->id, w->ifd, w->ofd);
+            break;
+        }
+
+        if(w->ifd == w->ofd) {
+            fds[0].fd = w->ifd;
+            fds[0].events = 0;
+            fds[0].revents = 0;
+
+            if(w->wait_receive) fds[0].events |= POLLIN;
+            if(w->wait_send)    fds[0].events |= POLLOUT;
+
+            fds[1].fd = -1;
+            fds[1].events = 0;
+            fds[1].revents = 0;
+
+            ifd = ofd = &fds[0];
+
+            fdmax = 1;
+        }
+        else {
+            fds[0].fd = w->ifd;
+            fds[0].events = 0;
+            fds[0].revents = 0;
+            if(w->wait_receive) fds[0].events |= POLLIN;
+            ifd = &fds[0];
+
+            fds[1].fd = w->ofd;
+            fds[1].events = 0;
+            fds[1].revents = 0;
+            if(w->wait_send)    fds[1].events |= POLLOUT;
+            ofd = &fds[1];
+
+            fdmax = 2;
+        }
+
+        debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
+        errno = 0;
+        timeout = web_client_timeout * 1000;
+        retval = poll(fds, fdmax, timeout);
+
+        if(unlikely(retval == -1)) {
+            if(errno == EAGAIN || errno == EINTR) {
+                debug(D_WEB_CLIENT, "%llu: EAGAIN received.", w->id);
+                continue;
+            }
+
+            debug(D_WEB_CLIENT, "%llu: LISTENER: poll() failed (input fd = %d, output fd = %d). Closing client.", w->id, w->ifd, w->ofd);
+            break;
+        }
+        else if(unlikely(!retval)) {
+            debug(D_WEB_CLIENT, "%llu: Timeout while waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
+            break;
+        }
+
+        int used = 0;
+        if(w->wait_send && ofd->revents & POLLOUT) {
+            used++;
+            if(web_client_send(w) < 0) {
+                debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
+                break;
+            }
+        }
+
+        if(w->wait_receive && (ifd->revents & POLLIN || ifd->revents & POLLPRI)) {
+            used++;
+            if(web_client_receive(w) < 0) {
+                debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
+                break;
+            }
+
+            if(w->mode == WEB_CLIENT_MODE_NORMAL) {
+                debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
+                web_client_process(w);
+            }
+        }
+
+        if(unlikely(!used)) {
+            debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on socket.", w->id);
+            break;
+        }
+    }
+
+    web_client_reset(w);
+
+    log_access("%llu: %s port %s disconnected from thread task id %d", w->id, w->client_ip, w->client_port, gettid());
+    debug(D_WEB_CLIENT, "%llu: done...", w->id);
+
+    // close the sockets/files now
+    // to free file descriptors
+    if(w->ifd == w->ofd) {
+        if(w->ifd != -1) close(w->ifd);
+    }
+    else {
+        if(w->ifd != -1) close(w->ifd);
+        if(w->ofd != -1) close(w->ofd);
+    }
+    w->ifd = -1;
+    w->ofd = -1;
+
+    w->obsolete = 1;
+
+    pthread_exit(NULL);
+    return NULL;
 }