Imported Upstream version 1.0.0upstream/1.0.0

1 files changed, 1814 insertions, 0 deletions

diff --git a/src/web_client.c b/src/web_client.c
new file mode 100755
index 000000000..127333554
--- /dev/null
+++ b/src/web_client.c
@@ -0,0 +1,1814 @@
+#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 <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 "web_client.h"
+
+#define INITIAL_WEB_DATA_LENGTH 16384
+#define WEB_REQUEST_LENGTH 16384
+
+int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
+int web_enable_gzip = 1;
+
+extern int netdata_exit;
+
+struct web_client *web_clients = NULL;
+unsigned long long web_clients_count = 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.");
+			strncpy(w->client_ip,   "UNKNOWN", NI_MAXHOST);
+			strncpy(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->wait_receive = 1;
+
+	if(web_clients) web_clients->prev = w;
+	w->next = web_clients;
+	web_clients = w;
+
+	global_statistics.connected_clients++;
+
+	return(w);
+}
+
+void web_client_reset(struct web_client *w)
+{
+	struct timeval tv;
+	gettimeofday(&tv, NULL);
+
+	long sent = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
+
+#ifdef NETDATA_WITH_ZLIB
+	if(likely(w->response.zoutput)) sent = (long)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->mode = WEB_CLIENT_MODE_NORMAL;
+
+	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;
+	}
+#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);
+
+	if(w->prev)	w->prev->next = w->next;
+	if(w->next) w->next->prev = w->prev;
+
+	if(w == web_clients) web_clients = w->next;
+
+	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);
+
+	global_statistics.connected_clients--;
+
+	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", NETDATA_USER);
+		if(!web_owner || !*web_owner)
+			owner_uid = geteuid();
+		else {
+			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);
+}
+
+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'", *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];
+	snprintf(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.", filename);
+		return 404;
+	}
+
+	// check if the file is owned by us
+	if(stat.st_uid != web_files_uid()) {
+		error("%llu: File '%s' is owned by user %d (I run as user %d). Access Denied.", w->id, webfilename, stat.st_uid, getuid());
+		buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", filename);
+		return 403;
+	}
+
+	if((stat.st_mode & S_IFMT) == S_IFDIR) {
+		snprintf(webfilename, FILENAME_MAX+1, "%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.", filename);
+		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.", filename);
+			return 307;
+		}
+		else {
+			error("%llu: Cannot open file '%s'.", w->id, webfilename);
+			buffer_sprintf(w->response.data, "Cannot open file '%s'.", filename);
+			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;
+}
+
+
+#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);
+}
+#endif // NETDATA_WITH_ZLIB
+
+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 web_client_api_request_v1_data_format(char *name)
+{
+	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_JSON)) // json
+		return DATASOURCE_JSON;
+
+	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_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_HTML)) // html
+		return DATASOURCE_HTML;
+
+	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_CSV_JSON_ARRAY)) // csvjsonarray
+		return DATASOURCE_CSV_JSON_ARRAY;
+
+	return DATASOURCE_JSON;
+}
+
+uint32_t web_client_api_request_v1_data_google_format(char *name)
+{
+	if(!strcmp(name, "json"))
+		return DATASOURCE_DATATABLE_JSONP;
+
+	else if(!strcmp(name, "html"))
+		return DATASOURCE_HTML;
+
+	else if(!strcmp(name, "csv"))
+		return DATASOURCE_CSV;
+
+	else if(!strcmp(name, "tsv-excel"))
+		return DATASOURCE_TSV;
+
+	return DATASOURCE_JSON;
+}
+
+int web_client_api_request_v1_data_group(char *name)
+{
+	if(!strcmp(name, "max"))
+		return GROUP_MAX;
+
+	else if(!strcmp(name, "average"))
+		return GROUP_AVERAGE;
+
+	return GROUP_MAX;
+}
+
+int web_client_api_request_v1_charts(struct web_client *w, char *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;
+}
+
+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;
+
+cleanup:
+	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 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, ");");
+
+cleanup:
+	if(dimensions) buffer_free(dimensions);
+	return ret;
+}
+
+int web_client_api_request_v1(struct web_client *w, char *url)
+{
+	// get the command
+	char *tok = mystrsep(&url, "/?&");
+	debug(D_WEB_CLIENT, "%llu: Searching for API v1 command '%s'.", w->id, tok);
+
+	if(strcmp(tok, "data") == 0)
+		return web_client_api_request_v1_data(w, url);
+	else if(strcmp(tok, "chart") == 0)
+		return web_client_api_request_v1_chart(w, url);
+	else if(strcmp(tok, "charts") == 0)
+		return web_client_api_request_v1_charts(w, url);
+
+	buffer_flush(w->response.data);
+	buffer_sprintf(w->response.data, "Unsupported v1 API command: %s", tok);
+	return 404;
+}
+
+int web_client_api_request(struct web_client *w, char *url)
+{
+	// get the api version
+	char *tok = mystrsep(&url, "/?&");
+	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);
+
+	buffer_flush(w->response.data);
+	buffer_sprintf(w->response.data, "Unsupported API version: %s", tok);
+	return 404;
+}
+
+int web_client_data_request(struct web_client *w, char *url, int datasource_type)
+{
+	char *args = strchr(url, '?');
+	if(args) {
+		*args='\0';
+		args = &args[1];
+	}
+
+	// get the name of the data to show
+	char *tok = mystrsep(&url, "/");
+	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);
+		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) 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(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) after = strtoul(tok, NULL, 10);
+		if(after < 0) after = 0;
+	}
+	if(url) {
+		// parse before time
+		tok = mystrsep(&url, "/");
+		if(tok) before = strtoul(tok, NULL, 10);
+		if(before < 0) before = 0;
+	}
+	if(url) {
+		// parse nonzero
+		tok = mystrsep(&url, "/");
+		if(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) {
+				char *name = mystrsep(&tok, "=");
+				if(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;
+}
+
+/*
+int web_client_parse_request(struct web_client *w) {
+	// protocol
+	// hostname
+	// path
+	// query string name-value
+	// http version
+	// method
+	// http request headers name-value
+
+	web_client_clean_request(w);
+
+	debug(D_WEB_DATA, "%llu: Processing data buffer of %d bytes: '%s'.", w->id, w->response.data->bytes, w->response.data->buffer);
+
+	char *buf = w->response.data->buffer;
+	char *line, *tok;
+
+	// ------------------------------------------------------------------------
+	// the first line
+
+	if(buf && (line = strsep(&buf, "\r\n"))) {
+		// method
+		if(line && (tok = strsep(&line, " "))) {
+			w->request.protocol = strdup(tok);
+		}
+		else goto cleanup;
+
+		// url
+	}
+	else goto cleanup;
+
+	// ------------------------------------------------------------------------
+	// the rest of the lines
+
+	while(buf && (line = strsep(&buf, "\r\n"))) {
+		while(line && (tok = strsep(&line, ": "))) {
+		}
+	}
+
+	char *url = NULL;
+
+
+cleanup:
+	web_client_clean_request(w);
+	return 0;
+}
+*/
+
+void web_client_process(struct web_client *w) {
+	int code = 500;
+	ssize_t bytes;
+	int enable_gzip = 0;
+
+	w->wait_receive = 0;
+
+	// check if we have an empty line (end of HTTP header)
+	if(strstr(w->response.data->buffer, "\r\n\r\n")) {
+		global_statistics_lock();
+		global_statistics.web_requests++;
+		global_statistics_unlock();
+
+		gettimeofday(&w->tv_in, NULL);
+		debug(D_WEB_DATA, "%llu: Processing data buffer of %d bytes: '%s'.", w->id, w->response.data->len, w->response.data->buffer);
+
+		// check if the client requested keep-alive HTTP
+		if(strcasestr(w->response.data->buffer, "Connection: keep-alive")) w->keepalive = 1;
+		else w->keepalive = 0;
+
+#ifdef NETDATA_WITH_ZLIB
+		// check if the client accepts deflate
+		if(web_enable_gzip && strstr(w->response.data->buffer, "gzip"))
+			enable_gzip = 1;
+#endif // NETDATA_WITH_ZLIB
+
+		int datasource_type = DATASOURCE_DATATABLE_JSONP;
+		//if(strstr(w->response.data->buffer, "X-DataSource-Auth"))
+		//	datasource_type = DATASOURCE_GOOGLE_JSON;
+
+		char *buf = (char *)buffer_tostring(w->response.data);
+		char *tok = strsep(&buf, " \r\n");
+		char *url = NULL;
+		char *pointer_to_free = NULL; // keep url_decode() allocated buffer
+
+		w->mode = WEB_CLIENT_MODE_NORMAL;
+
+		if(buf && strcmp(tok, "GET") == 0) {
+			tok = strsep(&buf, " \r\n");
+			pointer_to_free = url = url_decode(tok);
+			debug(D_WEB_CLIENT, "%llu: Processing HTTP GET on url '%s'.", w->id, url);
+		}
+		else if(buf && strcmp(tok, "OPTIONS") == 0) {
+			tok = strsep(&buf, " \r\n");
+			pointer_to_free = url = url_decode(tok);
+			debug(D_WEB_CLIENT, "%llu: Processing HTTP OPTIONS on url '%s'.", w->id, url);
+			w->mode = WEB_CLIENT_MODE_OPTIONS;
+		}
+		else if (buf && strcmp(tok, "POST") == 0) {
+			w->keepalive = 0;
+			tok = strsep(&buf, " \r\n");
+			pointer_to_free = url = url_decode(tok);
+			debug(D_WEB_CLIENT, "%llu: I don't know how to handle POST with form data. Assuming it is a GET on url '%s'.", w->id, url);
+		}
+
+		w->last_url[0] = '\0';
+
+		if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
+			strncpy(w->last_url, url, URL_MAX);
+			w->last_url[URL_MAX] = '\0';
+
+			code = 200;
+			w->response.data->contenttype = CT_TEXT_PLAIN;
+			buffer_flush(w->response.data);
+			buffer_strcat(w->response.data, "OK");
+		}
+		else if(url) {
+#ifdef NETDATA_WITH_ZLIB
+			if(enable_gzip)
+				web_client_enable_deflate(w);
+#endif
+
+			strncpy(w->last_url, url, URL_MAX);
+			w->last_url[URL_MAX] = '\0';
+
+			tok = mystrsep(&url, "/?");
+
+			debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
+
+			if(strcmp(tok, "api") == 0) {
+				// the client is requesting api access
+				datasource_type = DATASOURCE_JSON;
+				code = web_client_api_request(w, url);
+			}
+#ifdef NETDATA_INTERNAL_CHECKS
+			else if(strcmp(tok, "exit") == 0) {
+				netdata_exit = 1;
+				code = 200;
+				w->response.data->contenttype = CT_TEXT_PLAIN;
+				buffer_flush(w->response.data);
+				buffer_strcat(w->response.data, "will do");
+			}
+#endif
+			else if(strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
+				// the client is requesting rrd data
+				datasource_type = DATASOURCE_JSON;
+				code = web_client_data_request(w, url, datasource_type);
+			}
+			else if(strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
+				// the client is requesting google datasource
+				code = web_client_data_request(w, url, datasource_type);
+			}
+			else if(strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
+				// the client is requesting an rrd graph
+
+				// get the name of the data to show
+				tok = mystrsep(&url, "/?&");
+				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);
+				}
+			}
+#ifdef NETDATA_INTERNAL_CHECKS
+			else if(strcmp(tok, "debug") == 0) {
+				buffer_flush(w->response.data);
+
+				// get the name of the data to show
+				tok = mystrsep(&url, "/?&");
+				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?0:1;
+					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 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
+			else if(strcmp(tok, "list") == 0) {
+				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) {
+				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);
+			}
+			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 {
+				char filename[FILENAME_MAX+1];
+				url = filename;
+				strncpy(filename, w->last_url, FILENAME_MAX);
+				filename[FILENAME_MAX] = '\0';
+				tok = mystrsep(&url, "?");
+				buffer_flush(w->response.data);
+				code = mysendfile(w, (tok && *tok)?tok:"/");
+			}
+		}
+		else {
+			strcpy(w->last_url, "not a valid response");
+
+			if(buf) debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, buf);
+
+			code = 500;
+			buffer_flush(w->response.data);
+			buffer_strcat(w->response.data, "I don't understand you...\r\n");
+		}
+
+		// free url_decode() buffer
+		if(pointer_to_free) free(pointer_to_free);
+	}
+	else if(w->response.data->len > 8192) {
+		strcpy(w->last_url, "too big request");
+
+		debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big.", w->id);
+
+		code = 400;
+		buffer_flush(w->response.data);
+		buffer_strcat(w->response.data, "Received request is too big.\r\n");
+	}
+	else {
+		// wait for more data
+		w->wait_receive = 1;
+		return;
+	}
+
+	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;
+
+		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"
+		"Content-Type: %s\r\n"
+		"Access-Control-Allow-Origin: *\r\n"
+		"Access-Control-Allow-Methods: GET, OPTIONS\r\n"
+		"Access-Control-Allow-Headers: accept, x-requested-with\r\n"
+		"Access-Control-Max-Age: 86400\r\n"
+		"Date: %s\r\n"
+		, code, code_msg
+		, w->keepalive?"keep-alive":"close"
+		, content_type_string
+		, date
+		);
+
+	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 {
+		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;
+	}
+}
+
+long web_client_send_chunk_header(struct web_client *w, long 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;
+}
+
+long 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;
+}
+
+long 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;
+}
+
+#ifdef NETDATA_WITH_ZLIB
+long 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);
+}
+#endif // NETDATA_WITH_ZLIB
+
+long web_client_send(struct web_client *w)
+{
+#ifdef NETDATA_WITH_ZLIB
+	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);
+}
+
+long 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);
+}
+
+
+// --------------------------------------------------------------------------------------
+// the thread of a single client
+
+// 1. waits for input and output, using async I/O
+// 2. it processes HTTP requests
+// 3. it generates HTTP responses
+// 4. it copies data from input to output if mode is FILECOPY
+
+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;
+}