1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 /* HTTP routines for Apache proxy */
19 #include "mod_proxy.h"
22 module AP_MODULE_DECLARE_DATA proxy_http_module;
24 static apr_status_t ap_proxy_http_cleanup(const char *scheme,
26 proxy_conn_rec *backend);
29 * Canonicalise http-like URLs.
30 * scheme is the scheme for the URL
31 * url is the URL starting with the first '/'
32 * def_port is the default port for this scheme.
34 static int proxy_http_canon(request_rec *r, char *url)
36 char *host, *path, sport[7];
40 apr_port_t port, def_port;
42 /* ap_port_of_scheme() */
43 if (strncasecmp(url, "http:", 5) == 0) {
47 else if (strncasecmp(url, "https:", 6) == 0) {
54 def_port = apr_uri_port_of_scheme(scheme);
56 ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, r->server,
57 "proxy: HTTP: canonicalising URL %s", url);
60 * We break the URL into host, port, path, search
63 err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
65 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
66 "error parsing URL %s: %s",
68 return HTTP_BAD_REQUEST;
72 * now parse path/search args, according to rfc1738:
75 * In a reverse proxy, our URL has been processed, so canonicalise
76 * unless proxy-nocanon is set to say it's raw
77 * In a forward proxy, we have and MUST NOT MANGLE the original.
79 switch (r->proxyreq) {
80 default: /* wtf are we doing here? */
81 case PROXYREQ_REVERSE:
82 if (apr_table_get(r->notes, "proxy-nocanon")) {
83 path = url; /* this is the raw path */
86 path = ap_proxy_canonenc(r->pool, url, strlen(url),
87 enc_path, 0, r->proxyreq);
97 return HTTP_BAD_REQUEST;
100 apr_snprintf(sport, sizeof(sport), ":%d", port);
104 if (ap_strchr_c(host, ':')) { /* if literal IPv6 address */
105 host = apr_pstrcat(r->pool, "[", host, "]", NULL);
107 r->filename = apr_pstrcat(r->pool, "proxy:", scheme, "://", host, sport,
108 "/", path, (search) ? "?" : "", (search) ? search : "", NULL);
112 /* Clear all connection-based headers from the incoming headers table */
113 typedef struct header_dptr {
118 static ap_regex_t *warn_rx;
119 static int clean_warning_headers(void *data, const char *key, const char *val)
121 apr_table_t *headers = ((header_dptr*)data)->table;
122 apr_pool_t *pool = ((header_dptr*)data)->pool;
125 apr_time_t warn_time;
126 const int nmatch = 3;
127 ap_regmatch_t pmatch[3];
129 if (headers == NULL) {
130 ((header_dptr*)data)->table = headers = apr_table_make(pool, 2);
133 * Parse this, suckers!
135 * Warning = "Warning" ":" 1#warning-value
137 * warning-value = warn-code SP warn-agent SP warn-text
141 * warn-agent = ( host [ ":" port ] ) | pseudonym
142 * ; the name or pseudonym of the server adding
143 * ; the Warning header, for use in debugging
144 * warn-text = quoted-string
145 * warn-date = <"> HTTP-date <">
147 * Buggrit, use a bloomin' regexp!
148 * (\d{3}\s+\S+\s+\".*?\"(\s+\"(.*?)\")?) --> whole in $1, date in $3
150 while (!ap_regexec(warn_rx, val, nmatch, pmatch, 0)) {
151 warning = apr_pstrndup(pool, val+pmatch[0].rm_so,
152 pmatch[0].rm_eo - pmatch[0].rm_so);
154 if (pmatch[2].rm_eo > pmatch[2].rm_so) {
155 /* OK, we have a date here */
156 date = apr_pstrndup(pool, val+pmatch[2].rm_so,
157 pmatch[2].rm_eo - pmatch[2].rm_so);
158 warn_time = apr_date_parse_http(date);
160 if (!warn_time || (warn_time == ((header_dptr*)data)->time)) {
161 apr_table_addn(headers, key, warning);
163 val += pmatch[0].rm_eo;
167 static apr_table_t *ap_proxy_clean_warnings(apr_pool_t *p, apr_table_t *headers)
172 x.time = apr_date_parse_http(apr_table_get(headers, "Date"));
173 apr_table_do(clean_warning_headers, &x, headers, "Warning", NULL);
174 if (x.table != NULL) {
175 apr_table_unset(headers, "Warning");
176 return apr_table_overlay(p, headers, x.table);
182 static int clear_conn_headers(void *data, const char *key, const char *val)
184 apr_table_t *headers = ((header_dptr*)data)->table;
185 apr_pool_t *pool = ((header_dptr*)data)->pool;
187 char *next = apr_pstrdup(pool, val);
190 while (*next && !apr_isspace(*next) && (*next != ',')) {
193 while (*next && (apr_isspace(*next) || (*next == ','))) {
196 apr_table_unset(headers, name);
200 static void ap_proxy_clear_connection(apr_pool_t *p, apr_table_t *headers)
205 apr_table_unset(headers, "Proxy-Connection");
206 apr_table_do(clear_conn_headers, &x, headers, "Connection", NULL);
207 apr_table_unset(headers, "Connection");
209 static void add_te_chunked(apr_pool_t *p,
210 apr_bucket_alloc_t *bucket_alloc,
211 apr_bucket_brigade *header_brigade)
215 const char te_hdr[] = "Transfer-Encoding: chunked" CRLF;
217 buf = apr_pmemdup(p, te_hdr, sizeof(te_hdr)-1);
218 ap_xlate_proto_to_ascii(buf, sizeof(te_hdr)-1);
220 e = apr_bucket_pool_create(buf, sizeof(te_hdr)-1, p, bucket_alloc);
221 APR_BRIGADE_INSERT_TAIL(header_brigade, e);
224 static void add_cl(apr_pool_t *p,
225 apr_bucket_alloc_t *bucket_alloc,
226 apr_bucket_brigade *header_brigade,
232 buf = apr_pstrcat(p, "Content-Length: ",
236 ap_xlate_proto_to_ascii(buf, strlen(buf));
237 e = apr_bucket_pool_create(buf, strlen(buf), p, bucket_alloc);
238 APR_BRIGADE_INSERT_TAIL(header_brigade, e);
241 #define ASCII_CRLF "\015\012"
242 #define ASCII_ZERO "\060"
244 static void terminate_headers(apr_bucket_alloc_t *bucket_alloc,
245 apr_bucket_brigade *header_brigade)
249 /* add empty line at the end of the headers */
250 e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
251 APR_BRIGADE_INSERT_TAIL(header_brigade, e);
254 static int pass_brigade(apr_bucket_alloc_t *bucket_alloc,
255 request_rec *r, proxy_conn_rec *p_conn,
256 conn_rec *origin, apr_bucket_brigade *bb,
260 apr_off_t transferred;
263 apr_bucket *e = apr_bucket_flush_create(bucket_alloc);
264 APR_BRIGADE_INSERT_TAIL(bb, e);
266 apr_brigade_length(bb, 0, &transferred);
267 if (transferred != -1)
268 p_conn->worker->s->transferred += transferred;
269 status = ap_pass_brigade(origin->output_filters, bb);
270 if (status != APR_SUCCESS) {
271 ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
272 "proxy: pass request body failed to %pI (%s)",
273 p_conn->addr, p_conn->hostname);
274 if (origin->aborted) {
275 const char *ssl_note;
277 if (((ssl_note = apr_table_get(origin->notes, "SSL_connect_rv"))
278 != NULL) && (strcmp(ssl_note, "err") == 0)) {
279 return ap_proxyerror(r, HTTP_INTERNAL_SERVER_ERROR,
280 "Error during SSL Handshake with"
283 return APR_STATUS_IS_TIMEUP(status) ? HTTP_GATEWAY_TIME_OUT : HTTP_BAD_GATEWAY;
286 return HTTP_BAD_REQUEST;
289 apr_brigade_cleanup(bb);
293 #define MAX_MEM_SPOOL 16384
295 static int stream_reqbody_chunked(apr_pool_t *p,
297 proxy_conn_rec *p_conn,
299 apr_bucket_brigade *header_brigade,
300 apr_bucket_brigade *input_brigade)
302 int seen_eos = 0, rv = OK;
306 apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
307 apr_bucket_brigade *bb;
310 add_te_chunked(p, bucket_alloc, header_brigade);
311 terminate_headers(bucket_alloc, header_brigade);
313 while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade)))
315 char chunk_hdr[20]; /* must be here due to transient bucket. */
317 /* If this brigade contains EOS, either stop or remove it. */
318 if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
321 /* We can't pass this EOS to the output_filters. */
322 e = APR_BRIGADE_LAST(input_brigade);
323 apr_bucket_delete(e);
326 apr_brigade_length(input_brigade, 1, &bytes);
328 hdr_len = apr_snprintf(chunk_hdr, sizeof(chunk_hdr),
329 "%" APR_UINT64_T_HEX_FMT CRLF,
330 (apr_uint64_t)bytes);
332 ap_xlate_proto_to_ascii(chunk_hdr, hdr_len);
333 e = apr_bucket_transient_create(chunk_hdr, hdr_len,
335 APR_BRIGADE_INSERT_HEAD(input_brigade, e);
338 * Append the end-of-chunk CRLF
340 e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
341 APR_BRIGADE_INSERT_TAIL(input_brigade, e);
343 if (header_brigade) {
344 /* we never sent the header brigade, so go ahead and
345 * take care of that now
350 * Save input_brigade in bb brigade. (At least) in the SSL case
351 * input_brigade contains transient buckets whose data would get
352 * overwritten during the next call of ap_get_brigade in the loop.
353 * ap_save_brigade ensures these buckets to be set aside.
354 * Calling ap_save_brigade with NULL as filter is OK, because
355 * bb brigade already has been created and does not need to get
356 * created by ap_save_brigade.
358 status = ap_save_brigade(NULL, &bb, &input_brigade, p);
359 if (status != APR_SUCCESS) {
360 return HTTP_INTERNAL_SERVER_ERROR;
363 header_brigade = NULL;
369 /* The request is flushed below this loop with chunk EOS header */
370 rv = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 0);
379 status = ap_get_brigade(r->input_filters, input_brigade,
380 AP_MODE_READBYTES, APR_BLOCK_READ,
383 if (status != APR_SUCCESS) {
384 return HTTP_BAD_REQUEST;
388 if (header_brigade) {
389 /* we never sent the header brigade because there was no request body;
395 if (!APR_BRIGADE_EMPTY(input_brigade)) {
396 /* input brigade still has an EOS which we can't pass to the output_filters. */
397 e = APR_BRIGADE_LAST(input_brigade);
398 AP_DEBUG_ASSERT(APR_BUCKET_IS_EOS(e));
399 apr_bucket_delete(e);
404 e = apr_bucket_immortal_create(ASCII_ZERO ASCII_CRLF
408 APR_BRIGADE_INSERT_TAIL(bb, e);
410 if (apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) {
411 e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
412 APR_BRIGADE_INSERT_TAIL(bb, e);
415 /* Now we have headers-only, or the chunk EOS mark; flush it */
416 rv = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1);
420 static int stream_reqbody_cl(apr_pool_t *p,
422 proxy_conn_rec *p_conn,
424 apr_bucket_brigade *header_brigade,
425 apr_bucket_brigade *input_brigade,
426 const char *old_cl_val)
428 int seen_eos = 0, rv = 0;
429 apr_status_t status = APR_SUCCESS;
430 apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
431 apr_bucket_brigade *bb;
433 apr_off_t cl_val = 0;
435 apr_off_t bytes_streamed = 0;
440 add_cl(p, bucket_alloc, header_brigade, old_cl_val);
441 status = apr_strtoff(&cl_val, old_cl_val, &endstr, 10);
443 if (status || *endstr || endstr == old_cl_val || cl_val < 0) {
444 ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r,
445 "proxy: could not parse request Content-Length (%s)",
447 return HTTP_BAD_REQUEST;
450 terminate_headers(bucket_alloc, header_brigade);
452 while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade)))
454 apr_brigade_length(input_brigade, 1, &bytes);
455 bytes_streamed += bytes;
457 /* If this brigade contains EOS, either stop or remove it. */
458 if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
461 /* We can't pass this EOS to the output_filters. */
462 e = APR_BRIGADE_LAST(input_brigade);
463 apr_bucket_delete(e);
465 if (apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) {
466 e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
467 APR_BRIGADE_INSERT_TAIL(input_brigade, e);
471 /* C-L < bytes streamed?!?
472 * We will error out after the body is completely
473 * consumed, but we can't stream more bytes at the
474 * back end since they would in part be interpreted
475 * as another request! If nothing is sent, then
478 * Prevents HTTP Response Splitting.
480 if (bytes_streamed > cl_val) {
481 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
482 "proxy: read more bytes of request body than expected "
483 "(got %" APR_OFF_T_FMT ", expected %" APR_OFF_T_FMT ")",
484 bytes_streamed, cl_val);
485 return HTTP_INTERNAL_SERVER_ERROR;
488 if (header_brigade) {
489 /* we never sent the header brigade, so go ahead and
490 * take care of that now
495 * Save input_brigade in bb brigade. (At least) in the SSL case
496 * input_brigade contains transient buckets whose data would get
497 * overwritten during the next call of ap_get_brigade in the loop.
498 * ap_save_brigade ensures these buckets to be set aside.
499 * Calling ap_save_brigade with NULL as filter is OK, because
500 * bb brigade already has been created and does not need to get
501 * created by ap_save_brigade.
503 status = ap_save_brigade(NULL, &bb, &input_brigade, p);
504 if (status != APR_SUCCESS) {
505 return HTTP_INTERNAL_SERVER_ERROR;
508 header_brigade = NULL;
514 /* Once we hit EOS, we are ready to flush. */
515 rv = pass_brigade(bucket_alloc, r, p_conn, origin, bb, seen_eos);
524 status = ap_get_brigade(r->input_filters, input_brigade,
525 AP_MODE_READBYTES, APR_BLOCK_READ,
528 if (status != APR_SUCCESS) {
529 return HTTP_BAD_REQUEST;
533 if (bytes_streamed != cl_val) {
534 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
535 "proxy: client %s given Content-Length did not match"
536 " number of body bytes read", r->connection->remote_ip);
537 return HTTP_BAD_REQUEST;
540 if (header_brigade) {
541 /* we never sent the header brigade since there was no request
542 * body; send it now with the flush flag
545 return(pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1));
551 static int spool_reqbody_cl(apr_pool_t *p,
553 proxy_conn_rec *p_conn,
555 apr_bucket_brigade *header_brigade,
556 apr_bucket_brigade *input_brigade,
561 apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
562 apr_bucket_brigade *body_brigade;
564 apr_off_t bytes, bytes_spooled = 0, fsize = 0;
565 apr_file_t *tmpfile = NULL;
568 body_brigade = apr_brigade_create(p, bucket_alloc);
570 limit = ap_get_limit_req_body(r);
572 while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade)))
574 /* If this brigade contains EOS, either stop or remove it. */
575 if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
578 /* We can't pass this EOS to the output_filters. */
579 e = APR_BRIGADE_LAST(input_brigade);
580 apr_bucket_delete(e);
583 apr_brigade_length(input_brigade, 1, &bytes);
585 if (bytes_spooled + bytes > MAX_MEM_SPOOL) {
587 * LimitRequestBody does not affect Proxy requests (Should it?).
588 * Let it take effect if we decide to store the body in a
589 * temporary file on disk.
591 if (bytes_spooled + bytes > limit) {
592 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
593 "proxy: Request body is larger than the"
594 " configured limit of %" APR_OFF_T_FMT ".",
596 return HTTP_REQUEST_ENTITY_TOO_LARGE;
598 /* can't spool any more in memory; write latest brigade to disk */
599 if (tmpfile == NULL) {
600 const char *temp_dir;
603 status = apr_temp_dir_get(&temp_dir, p);
604 if (status != APR_SUCCESS) {
605 ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
606 "proxy: search for temporary directory failed");
607 return HTTP_INTERNAL_SERVER_ERROR;
609 apr_filepath_merge(&template, temp_dir,
610 "modproxy.tmp.XXXXXX",
611 APR_FILEPATH_NATIVE, p);
612 status = apr_file_mktemp(&tmpfile, template, 0, p);
613 if (status != APR_SUCCESS) {
614 ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
615 "proxy: creation of temporary file in directory %s failed",
617 return HTTP_INTERNAL_SERVER_ERROR;
620 for (e = APR_BRIGADE_FIRST(input_brigade);
621 e != APR_BRIGADE_SENTINEL(input_brigade);
622 e = APR_BUCKET_NEXT(e)) {
624 apr_size_t bytes_read, bytes_written;
626 apr_bucket_read(e, &data, &bytes_read, APR_BLOCK_READ);
627 status = apr_file_write_full(tmpfile, data, bytes_read, &bytes_written);
628 if (status != APR_SUCCESS) {
629 const char *tmpfile_name;
631 if (apr_file_name_get(&tmpfile_name, tmpfile) != APR_SUCCESS) {
632 tmpfile_name = "(unknown)";
634 ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
635 "proxy: write to temporary file %s failed",
637 return HTTP_INTERNAL_SERVER_ERROR;
639 AP_DEBUG_ASSERT(bytes_read == bytes_written);
640 fsize += bytes_written;
642 apr_brigade_cleanup(input_brigade);
647 * Save input_brigade in body_brigade. (At least) in the SSL case
648 * input_brigade contains transient buckets whose data would get
649 * overwritten during the next call of ap_get_brigade in the loop.
650 * ap_save_brigade ensures these buckets to be set aside.
651 * Calling ap_save_brigade with NULL as filter is OK, because
652 * body_brigade already has been created and does not need to get
653 * created by ap_save_brigade.
655 status = ap_save_brigade(NULL, &body_brigade, &input_brigade, p);
656 if (status != APR_SUCCESS) {
657 return HTTP_INTERNAL_SERVER_ERROR;
662 bytes_spooled += bytes;
668 status = ap_get_brigade(r->input_filters, input_brigade,
669 AP_MODE_READBYTES, APR_BLOCK_READ,
672 if (status != APR_SUCCESS) {
673 return HTTP_BAD_REQUEST;
677 if (bytes_spooled || force_cl) {
678 add_cl(p, bucket_alloc, header_brigade, apr_off_t_toa(p, bytes_spooled));
680 terminate_headers(bucket_alloc, header_brigade);
681 APR_BRIGADE_CONCAT(header_brigade, body_brigade);
683 apr_brigade_insert_file(header_brigade, tmpfile, 0, fsize, p);
685 if (apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) {
686 e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
687 APR_BRIGADE_INSERT_TAIL(header_brigade, e);
689 /* This is all a single brigade, pass with flush flagged */
690 return(pass_brigade(bucket_alloc, r, p_conn, origin, header_brigade, 1));
694 int ap_proxy_http_request(apr_pool_t *p, request_rec *r,
695 proxy_conn_rec *p_conn, proxy_worker *worker,
696 proxy_server_conf *conf,
698 char *url, char *server_portstr)
700 conn_rec *c = r->connection;
701 apr_bucket_alloc_t *bucket_alloc = c->bucket_alloc;
702 apr_bucket_brigade *header_brigade;
703 apr_bucket_brigade *input_brigade;
704 apr_bucket_brigade *temp_brigade;
707 const apr_array_header_t *headers_in_array;
708 const apr_table_entry_t *headers_in;
711 enum rb_methods {RB_INIT, RB_STREAM_CL, RB_STREAM_CHUNKED, RB_SPOOL_CL};
712 enum rb_methods rb_method = RB_INIT;
713 const char *old_cl_val = NULL;
714 const char *old_te_val = NULL;
715 apr_off_t bytes_read = 0;
718 apr_table_t *headers_in_copy;
719 proxy_dir_conf *dconf;
720 conn_rec *origin = p_conn->connection;
723 dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
724 header_brigade = apr_brigade_create(p, origin->bucket_alloc);
727 * Send the HTTP/1.1 request to the remote server
731 * To be compliant, we only use 100-Continue for requests with bodies.
732 * We also make sure we won't be talking HTTP/1.0 as well.
734 do_100_continue = (worker->s->ping_timeout_set
735 && ap_request_has_body(r)
736 && (PROXYREQ_REVERSE == r->proxyreq)
737 && !(apr_table_get(r->subprocess_env, "force-proxy-request-1.0")));
739 if (apr_table_get(r->subprocess_env, "force-proxy-request-1.0")) {
741 * According to RFC 2616 8.2.3 we are not allowed to forward an
742 * Expect: 100-continue to an HTTP/1.0 server. Instead we MUST return
743 * a HTTP_EXPECTATION_FAILED
745 if (r->expecting_100) {
746 return HTTP_EXPECTATION_FAILED;
748 buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL);
752 buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL);
755 if (apr_table_get(r->subprocess_env, "proxy-nokeepalive")) {
756 origin->keepalive = AP_CONN_CLOSE;
759 ap_xlate_proto_to_ascii(buf, strlen(buf));
760 e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
761 APR_BRIGADE_INSERT_TAIL(header_brigade, e);
762 if (dconf->preserve_host == 0) {
763 if (ap_strchr_c(uri->hostname, ':')) { /* if literal IPv6 address */
764 if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
765 buf = apr_pstrcat(p, "Host: [", uri->hostname, "]:",
766 uri->port_str, CRLF, NULL);
768 buf = apr_pstrcat(p, "Host: [", uri->hostname, "]", CRLF, NULL);
771 if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
772 buf = apr_pstrcat(p, "Host: ", uri->hostname, ":",
773 uri->port_str, CRLF, NULL);
775 buf = apr_pstrcat(p, "Host: ", uri->hostname, CRLF, NULL);
780 /* don't want to use r->hostname, as the incoming header might have a
783 const char* hostname = apr_table_get(r->headers_in,"Host");
785 hostname = r->server->server_hostname;
786 ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
787 "proxy: no HTTP 0.9 request (with no host line) "
788 "on incoming request and preserve host set "
789 "forcing hostname to be %s for uri %s",
793 buf = apr_pstrcat(p, "Host: ", hostname, CRLF, NULL);
795 ap_xlate_proto_to_ascii(buf, strlen(buf));
796 e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
797 APR_BRIGADE_INSERT_TAIL(header_brigade, e);
800 if (conf->viaopt == via_block) {
801 /* Block all outgoing Via: headers */
802 apr_table_unset(r->headers_in, "Via");
803 } else if (conf->viaopt != via_off) {
804 const char *server_name = ap_get_server_name(r);
805 /* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
806 * then the server name returned by ap_get_server_name() is the
807 * origin server name (which does make too much sense with Via: headers)
808 * so we use the proxy vhost's name instead.
810 if (server_name == r->hostname)
811 server_name = r->server->server_hostname;
812 /* Create a "Via:" request header entry and merge it */
813 /* Generate outgoing Via: header with/without server comment: */
814 apr_table_mergen(r->headers_in, "Via",
815 (conf->viaopt == via_full)
816 ? apr_psprintf(p, "%d.%d %s%s (%s)",
817 HTTP_VERSION_MAJOR(r->proto_num),
818 HTTP_VERSION_MINOR(r->proto_num),
819 server_name, server_portstr,
820 AP_SERVER_BASEVERSION)
821 : apr_psprintf(p, "%d.%d %s%s",
822 HTTP_VERSION_MAJOR(r->proto_num),
823 HTTP_VERSION_MINOR(r->proto_num),
824 server_name, server_portstr)
828 /* Use HTTP/1.1 100-Continue as quick "HTTP ping" test
831 if (do_100_continue) {
832 apr_table_mergen(r->headers_in, "Expect", "100-Continue");
833 r->expecting_100 = 1;
836 /* X-Forwarded-*: handling
841 * These request headers are only really useful when the mod_proxy
842 * is used in a reverse proxy configuration, so that useful info
843 * about the client can be passed through the reverse proxy and on
844 * to the backend server, which may require the information to
847 * In a forward proxy situation, these options are a potential
848 * privacy violation, as information about clients behind the proxy
849 * are revealed to arbitrary servers out there on the internet.
851 * The HTTP/1.1 Via: header is designed for passing client
852 * information through proxies to a server, and should be used in
853 * a forward proxy configuation instead of X-Forwarded-*. See the
854 * ProxyVia option for details.
856 if (dconf->add_forwarded_headers) {
857 if (PROXYREQ_REVERSE == r->proxyreq) {
860 /* Add X-Forwarded-For: so that the upstream has a chance to
861 * determine, where the original request came from.
863 apr_table_mergen(r->headers_in, "X-Forwarded-For",
866 /* Add X-Forwarded-Host: so that upstream knows what the
867 * original request hostname was.
869 if ((buf = apr_table_get(r->headers_in, "Host"))) {
870 apr_table_mergen(r->headers_in, "X-Forwarded-Host", buf);
873 /* Add X-Forwarded-Server: so that upstream knows what the
874 * name of this proxy server is (if there are more than one)
875 * XXX: This duplicates Via: - do we strictly need it?
877 apr_table_mergen(r->headers_in, "X-Forwarded-Server",
878 r->server->server_hostname);
884 * Make a copy of the headers_in table before clearing the connection
885 * headers as we need the connection headers later in the http output
886 * filter to prepare the correct response headers.
888 * Note: We need to take r->pool for apr_table_copy as the key / value
889 * pairs in r->headers_in have been created out of r->pool and
890 * p might be (and actually is) a longer living pool.
891 * This would trigger the bad pool ancestry abort in apr_table_copy if
892 * apr is compiled with APR_POOL_DEBUG.
894 headers_in_copy = apr_table_copy(r->pool, r->headers_in);
895 ap_proxy_clear_connection(p, headers_in_copy);
896 /* send request headers */
897 headers_in_array = apr_table_elts(headers_in_copy);
898 headers_in = (const apr_table_entry_t *) headers_in_array->elts;
899 for (counter = 0; counter < headers_in_array->nelts; counter++) {
900 if (headers_in[counter].key == NULL
901 || headers_in[counter].val == NULL
904 || !strcasecmp(headers_in[counter].key, "Host")
906 /* Clear out hop-by-hop request headers not to send
907 * RFC2616 13.5.1 says we should strip these headers
909 || !strcasecmp(headers_in[counter].key, "Keep-Alive")
910 || !strcasecmp(headers_in[counter].key, "TE")
911 || !strcasecmp(headers_in[counter].key, "Trailer")
912 || !strcasecmp(headers_in[counter].key, "Upgrade")
917 /* Do we want to strip Proxy-Authorization ?
918 * If we haven't used it, then NO
919 * If we have used it then MAYBE: RFC2616 says we MAY propagate it.
920 * So let's make it configurable by env.
922 if (!strcasecmp(headers_in[counter].key,"Proxy-Authorization")) {
923 if (r->user != NULL) { /* we've authenticated */
924 if (!apr_table_get(r->subprocess_env, "Proxy-Chain-Auth")) {
931 /* Skip Transfer-Encoding and Content-Length for now.
933 if (!strcasecmp(headers_in[counter].key, "Transfer-Encoding")) {
934 old_te_val = headers_in[counter].val;
937 if (!strcasecmp(headers_in[counter].key, "Content-Length")) {
938 old_cl_val = headers_in[counter].val;
942 /* for sub-requests, ignore freshness/expiry headers */
944 if ( !strcasecmp(headers_in[counter].key, "If-Match")
945 || !strcasecmp(headers_in[counter].key, "If-Modified-Since")
946 || !strcasecmp(headers_in[counter].key, "If-Range")
947 || !strcasecmp(headers_in[counter].key, "If-Unmodified-Since")
948 || !strcasecmp(headers_in[counter].key, "If-None-Match")) {
953 buf = apr_pstrcat(p, headers_in[counter].key, ": ",
954 headers_in[counter].val, CRLF,
956 ap_xlate_proto_to_ascii(buf, strlen(buf));
957 e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
958 APR_BRIGADE_INSERT_TAIL(header_brigade, e);
961 /* We have headers, let's figure out our request body... */
962 input_brigade = apr_brigade_create(p, bucket_alloc);
964 /* sub-requests never use keepalives, and mustn't pass request bodies.
965 * Because the new logic looks at input_brigade, we will self-terminate
966 * input_brigade and jump past all of the request body logic...
967 * Reading anything with ap_get_brigade is likely to consume the
968 * main request's body or read beyond EOS - which would be unplesant.
970 * An exception: when a kept_body is present, then subrequest CAN use
971 * pass request bodies, and we DONT skip the body.
973 if (!r->kept_body && r->main) {
974 /* XXX: Why DON'T sub-requests use keepalives? */
978 apr_table_unset(r->headers_in, "Content-Length");
982 apr_table_unset(r->headers_in, "Transfer-Encoding");
984 rb_method = RB_STREAM_CL;
985 e = apr_bucket_eos_create(input_brigade->bucket_alloc);
986 APR_BRIGADE_INSERT_TAIL(input_brigade, e);
990 /* WE only understand chunked. Other modules might inject
991 * (and therefore, decode) other flavors but we don't know
992 * that the can and have done so unless they they remove
993 * their decoding from the headers_in T-E list.
994 * XXX: Make this extensible, but in doing so, presume the
995 * encoding has been done by the extensions' handler, and
996 * do not modify add_te_chunked's logic
998 if (old_te_val && strcasecmp(old_te_val, "chunked") != 0) {
999 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
1000 "proxy: %s Transfer-Encoding is not supported",
1002 return HTTP_INTERNAL_SERVER_ERROR;
1005 if (old_cl_val && old_te_val) {
1006 ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_ENOTIMPL, r->server,
1007 "proxy: client %s (%s) requested Transfer-Encoding "
1008 "chunked body with Content-Length (C-L ignored)",
1009 c->remote_ip, c->remote_host ? c->remote_host: "");
1010 apr_table_unset(r->headers_in, "Content-Length");
1012 origin->keepalive = AP_CONN_CLOSE;
1016 /* Prefetch MAX_MEM_SPOOL bytes
1018 * This helps us avoid any election of C-L v.s. T-E
1019 * request bodies, since we are willing to keep in
1020 * memory this much data, in any case. This gives
1021 * us an instant C-L election if the body is of some
1024 temp_brigade = apr_brigade_create(p, bucket_alloc);
1026 status = ap_get_brigade(r->input_filters, temp_brigade,
1027 AP_MODE_READBYTES, APR_BLOCK_READ,
1028 MAX_MEM_SPOOL - bytes_read);
1029 if (status != APR_SUCCESS) {
1030 ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
1031 "proxy: prefetch request body failed to %pI (%s)"
1033 p_conn->addr, p_conn->hostname ? p_conn->hostname: "",
1034 c->remote_ip, c->remote_host ? c->remote_host: "");
1035 return HTTP_BAD_REQUEST;
1038 apr_brigade_length(temp_brigade, 1, &bytes);
1039 bytes_read += bytes;
1042 * Save temp_brigade in input_brigade. (At least) in the SSL case
1043 * temp_brigade contains transient buckets whose data would get
1044 * overwritten during the next call of ap_get_brigade in the loop.
1045 * ap_save_brigade ensures these buckets to be set aside.
1046 * Calling ap_save_brigade with NULL as filter is OK, because
1047 * input_brigade already has been created and does not need to get
1048 * created by ap_save_brigade.
1050 status = ap_save_brigade(NULL, &input_brigade, &temp_brigade, p);
1051 if (status != APR_SUCCESS) {
1052 ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
1053 "proxy: processing prefetched request body failed"
1054 " to %pI (%s) from %s (%s)",
1055 p_conn->addr, p_conn->hostname ? p_conn->hostname: "",
1056 c->remote_ip, c->remote_host ? c->remote_host: "");
1057 return HTTP_INTERNAL_SERVER_ERROR;
1060 /* Ensure we don't hit a wall where we have a buffer too small
1061 * for ap_get_brigade's filters to fetch us another bucket,
1062 * surrender once we hit 80 bytes less than MAX_MEM_SPOOL
1063 * (an arbitrary value.)
1065 } while ((bytes_read < MAX_MEM_SPOOL - 80)
1066 && !APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade)));
1068 /* Use chunked request body encoding or send a content-length body?
1072 * We have no request body (handled by RB_STREAM_CL)
1074 * We have a request body length <= MAX_MEM_SPOOL
1076 * The administrator has setenv force-proxy-request-1.0
1078 * The client sent a C-L body, and the administrator has
1079 * not setenv proxy-sendchunked or has set setenv proxy-sendcl
1081 * The client sent a T-E body, and the administrator has
1082 * setenv proxy-sendcl, and not setenv proxy-sendchunked
1084 * If both proxy-sendcl and proxy-sendchunked are set, the
1085 * behavior is the same as if neither were set, large bodies
1086 * that can't be read will be forwarded in their original
1087 * form of C-L, or T-E.
1089 * To ensure maximum compatibility, setenv proxy-sendcl
1090 * To reduce server resource use, setenv proxy-sendchunked
1092 * Then address specific servers with conditional setenv
1093 * options to restore the default behavior where desireable.
1095 * We have to compute content length by reading the entire request
1096 * body; if request body is not small, we'll spool the remaining
1097 * input to a temporary file. Chunked is always preferable.
1099 * We can only trust the client-provided C-L if the T-E header
1100 * is absent, and the filters are unchanged (the body won't
1101 * be resized by another content filter).
1103 if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
1104 /* The whole thing fit, so our decision is trivial, use
1105 * the filtered bytes read from the client for the request
1106 * body Content-Length.
1108 * If we expected no body, and read no body, do not set
1109 * the Content-Length.
1111 if (old_cl_val || old_te_val || bytes_read) {
1112 old_cl_val = apr_off_t_toa(r->pool, bytes_read);
1114 rb_method = RB_STREAM_CL;
1116 else if (old_te_val) {
1118 || (apr_table_get(r->subprocess_env, "proxy-sendcl")
1119 && !apr_table_get(r->subprocess_env, "proxy-sendchunks")
1120 && !apr_table_get(r->subprocess_env, "proxy-sendchunked"))) {
1121 rb_method = RB_SPOOL_CL;
1124 rb_method = RB_STREAM_CHUNKED;
1127 else if (old_cl_val) {
1128 if (r->input_filters == r->proto_input_filters) {
1129 rb_method = RB_STREAM_CL;
1132 && (apr_table_get(r->subprocess_env, "proxy-sendchunks")
1133 || apr_table_get(r->subprocess_env, "proxy-sendchunked"))
1134 && !apr_table_get(r->subprocess_env, "proxy-sendcl")) {
1135 rb_method = RB_STREAM_CHUNKED;
1138 rb_method = RB_SPOOL_CL;
1142 /* This is an appropriate default; very efficient for no-body
1143 * requests, and has the behavior that it will not add any C-L
1144 * when the old_cl_val is NULL.
1146 rb_method = RB_SPOOL_CL;
1149 /* Yes I hate gotos. This is the subrequest shortcut */
1152 * Handle Connection: header if we do HTTP/1.1 request:
1153 * If we plan to close the backend connection sent Connection: close
1154 * otherwise sent Connection: Keep-Alive.
1157 if (p_conn->close) {
1158 buf = apr_pstrdup(p, "Connection: close" CRLF);
1161 buf = apr_pstrdup(p, "Connection: Keep-Alive" CRLF);
1163 ap_xlate_proto_to_ascii(buf, strlen(buf));
1164 e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
1165 APR_BRIGADE_INSERT_TAIL(header_brigade, e);
1168 /* send the request body, if any. */
1170 case RB_STREAM_CHUNKED:
1171 rv = stream_reqbody_chunked(p, r, p_conn, origin, header_brigade,
1175 rv = stream_reqbody_cl(p, r, p_conn, origin, header_brigade,
1176 input_brigade, old_cl_val);
1179 rv = spool_reqbody_cl(p, r, p_conn, origin, header_brigade,
1180 input_brigade, (old_cl_val != NULL)
1181 || (old_te_val != NULL)
1182 || (bytes_read > 0));
1185 /* shouldn't be possible */
1186 rv = HTTP_INTERNAL_SERVER_ERROR ;
1191 /* apr_status_t value has been logged in lower level method */
1192 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
1193 "proxy: pass request body failed to %pI (%s)"
1196 p_conn->hostname ? p_conn->hostname: "",
1198 c->remote_host ? c->remote_host: "");
1205 static void process_proxy_header(request_rec *r, proxy_dir_conf *c,
1206 const char *key, const char *value)
1208 static const char *date_hdrs[]
1209 = { "Date", "Expires", "Last-Modified", NULL };
1210 static const struct {
1212 ap_proxy_header_reverse_map_fn func;
1213 } transform_hdrs[] = {
1214 { "Location", ap_proxy_location_reverse_map },
1215 { "Content-Location", ap_proxy_location_reverse_map },
1216 { "URI", ap_proxy_location_reverse_map },
1217 { "Destination", ap_proxy_location_reverse_map },
1218 { "Set-Cookie", ap_proxy_cookie_reverse_map },
1222 for (i = 0; date_hdrs[i]; ++i) {
1223 if (!strcasecmp(date_hdrs[i], key)) {
1224 apr_table_add(r->headers_out, key,
1225 ap_proxy_date_canon(r->pool, value));
1229 for (i = 0; transform_hdrs[i].name; ++i) {
1230 if (!strcasecmp(transform_hdrs[i].name, key)) {
1231 apr_table_add(r->headers_out, key,
1232 (*transform_hdrs[i].func)(r, c, value));
1236 apr_table_add(r->headers_out, key, value);
1241 * Note: pread_len is the length of the response that we've mistakenly
1242 * read (assuming that we don't consider that an error via
1243 * ProxyBadHeader StartBody). This depends on buffer actually being
1244 * local storage to the calling code in order for pread_len to make
1245 * any sense at all, since we depend on buffer still containing
1246 * what was read by ap_getline() upon return.
1248 static void ap_proxy_read_headers(request_rec *r, request_rec *rr,
1249 char *buffer, int size,
1250 conn_rec *c, int *pread_len)
1254 char field[MAX_STRING_LEN];
1255 int saw_headers = 0;
1256 void *sconf = r->server->module_config;
1257 proxy_server_conf *psc;
1258 proxy_dir_conf *dconf;
1260 dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
1261 psc = (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
1263 r->headers_out = apr_table_make(r->pool, 20);
1267 * Read header lines until we get the empty separator line, a read error,
1268 * the connection closes (EOF), or we timeout.
1270 ap_log_rerror(APLOG_MARK, APLOG_TRACE4, 0, r,
1271 "Headers received from backend:");
1272 while ((len = ap_getline(buffer, size, rr, 1)) > 0) {
1273 ap_log_rerror(APLOG_MARK, APLOG_TRACE4, 0, r, "%s", buffer);
1275 if (!(value = strchr(buffer, ':'))) { /* Find the colon separator */
1277 /* We may encounter invalid headers, usually from buggy
1278 * MS IIS servers, so we need to determine just how to handle
1279 * them. We can either ignore them, assume that they mark the
1280 * start-of-body (eg: a missing CRLF) or (the default) mark
1281 * the headers as totally bogus and return a 500. The sole
1282 * exception is an extra "HTTP/1.0 200, OK" line sprinkled
1283 * in between the usual MIME headers, which is a favorite
1286 /* XXX: The mask check is buggy if we ever see an HTTP/1.10 */
1288 if (!apr_date_checkmask(buffer, "HTTP/#.# ###*")) {
1289 if (psc->badopt == bad_error) {
1290 /* Nope, it wasn't even an extra HTTP header. Give up. */
1291 r->headers_out = NULL;
1294 else if (psc->badopt == bad_body) {
1295 /* if we've already started loading headers_out, then
1296 * return what we've accumulated so far, in the hopes
1297 * that they are useful; also note that we likely pre-read
1298 * the first line of the response.
1301 ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
1302 "proxy: Starting body due to bogus non-header in headers "
1303 "returned by %s (%s)", r->uri, r->method);
1307 ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
1308 "proxy: No HTTP headers "
1309 "returned by %s (%s)", r->uri, r->method);
1314 /* this is the psc->badopt == bad_ignore case */
1315 ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
1316 "proxy: Ignoring bogus HTTP header "
1317 "returned by %s (%s)", r->uri, r->method);
1323 /* XXX: RFC2068 defines only SP and HT as whitespace, this test is
1324 * wrong... and so are many others probably.
1326 while (apr_isspace(*value))
1327 ++value; /* Skip to start of value */
1329 /* should strip trailing whitespace as well */
1330 for (end = &value[strlen(value)-1]; end > value && apr_isspace(*end); --
1334 /* make sure we add so as not to destroy duplicated headers
1335 * Modify headers requiring canonicalisation and/or affected
1336 * by ProxyPassReverse and family with process_proxy_header
1338 process_proxy_header(r, dconf, buffer, value) ;
1341 /* the header was too long; at the least we should skip extra data */
1342 if (len >= size - 1) {
1343 while ((len = ap_getline(field, MAX_STRING_LEN, rr, 1))
1344 >= MAX_STRING_LEN - 1) {
1345 /* soak up the extra data */
1347 if (len == 0) /* time to exit the larger loop as well */
1355 static int addit_dammit(void *v, const char *key, const char *val)
1357 apr_table_addn(v, key, val);
1362 apr_status_t ap_proxygetline(apr_bucket_brigade *bb, char *s, int n, request_rec *r,
1363 int fold, int *writen)
1369 rv = ap_rgetline(&tmp_s, n, &len, r, fold, bb);
1370 apr_brigade_cleanup(bb);
1372 if (rv == APR_SUCCESS) {
1373 *writen = (int) len;
1374 } else if (APR_STATUS_IS_ENOSPC(rv)) {
1384 * Limit the number of interim respones we sent back to the client. Otherwise
1385 * we suffer from a memory build up. Besides there is NO sense in sending back
1386 * an unlimited number of interim responses to the client. Thus if we cross
1387 * this limit send back a 502 (Bad Gateway).
1389 #ifndef AP_MAX_INTERIM_RESPONSES
1390 #define AP_MAX_INTERIM_RESPONSES 10
1394 apr_status_t ap_proxy_http_process_response(apr_pool_t * p, request_rec *r,
1395 proxy_conn_rec **backend_ptr,
1396 proxy_worker *worker,
1397 proxy_server_conf *conf,
1398 char *server_portstr) {
1399 conn_rec *c = r->connection;
1400 char buffer[HUGE_STRING_LEN];
1404 apr_bucket_brigade *bb, *tmp_bb;
1405 apr_bucket_brigade *pass_bb;
1406 int len, backasswards;
1407 int interim_response = 0; /* non-zero whilst interim 1xx responses
1408 * are being read. */
1410 apr_table_t *save_table;
1411 int backend_broke = 0;
1412 static const char *hop_by_hop_hdrs[] =
1413 {"Keep-Alive", "Proxy-Authenticate", "TE", "Trailer", "Upgrade", NULL};
1415 const char *te = NULL;
1416 int original_status = r->status;
1417 int proxy_status = OK;
1418 const char *original_status_line = r->status_line;
1419 const char *proxy_status_line = NULL;
1420 proxy_conn_rec *backend = *backend_ptr;
1421 conn_rec *origin = backend->connection;
1422 apr_interval_time_t old_timeout = 0;
1423 proxy_dir_conf *dconf;
1424 int do_100_continue;
1426 dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
1428 do_100_continue = (worker->s->ping_timeout_set
1429 && ap_request_has_body(r)
1430 && (PROXYREQ_REVERSE == r->proxyreq)
1431 && !(apr_table_get(r->subprocess_env, "force-proxy-request-1.0")));
1433 bb = apr_brigade_create(p, c->bucket_alloc);
1434 pass_bb = apr_brigade_create(p, c->bucket_alloc);
1436 /* Setup for 100-Continue timeout if appropriate */
1437 if (do_100_continue) {
1438 apr_socket_timeout_get(backend->sock, &old_timeout);
1439 if (worker->s->ping_timeout != old_timeout) {
1441 rc = apr_socket_timeout_set(backend->sock, worker->s->ping_timeout);
1442 if (rc != APR_SUCCESS) {
1443 ap_log_error(APLOG_MARK, APLOG_ERR, rc, r->server,
1444 "proxy: could not set 100-Continue timeout");
1449 /* Get response from the remote server, and pass it up the
1453 backend->r = ap_proxy_make_fake_req(origin, r);
1454 /* In case anyone needs to know, this is a fake request that is really a
1457 backend->r->proxyreq = PROXYREQ_RESPONSE;
1458 tmp_bb = apr_brigade_create(p, c->bucket_alloc);
1462 apr_brigade_cleanup(bb);
1464 rc = ap_proxygetline(tmp_bb, buffer, sizeof(buffer), backend->r, 0, &len);
1466 /* handle one potential stray CRLF */
1467 rc = ap_proxygetline(tmp_bb, buffer, sizeof(buffer), backend->r, 0, &len);
1470 ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r,
1471 "proxy: error reading status line from remote "
1472 "server %s:%d", backend->hostname, backend->port);
1473 if (APR_STATUS_IS_TIMEUP(rc)) {
1474 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1475 "proxy: read timeout");
1476 if (do_100_continue) {
1477 return ap_proxyerror(r, HTTP_SERVICE_UNAVAILABLE, "Timeout on 100-Continue");
1481 * If we are a reverse proxy request shutdown the connection
1482 * WITHOUT ANY response to trigger a retry by the client
1483 * if allowed (as for idempotent requests).
1484 * BUT currently we should not do this if the request is the
1485 * first request on a keepalive connection as browsers like
1486 * seamonkey only display an empty page in this case and do
1487 * not do a retry. We should also not do this on a
1488 * connection which times out; instead handle as
1489 * we normally would handle timeouts
1491 if (r->proxyreq == PROXYREQ_REVERSE && c->keepalives &&
1492 !APR_STATUS_IS_TIMEUP(rc)) {
1495 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1496 "proxy: Closing connection to client because"
1497 " reading from backend server %s:%d failed."
1498 " Number of keepalives %i", backend->hostname,
1499 backend->port, c->keepalives);
1500 ap_proxy_backend_broke(r, bb);
1502 * Add an EOC bucket to signal the ap_http_header_filter
1503 * that it should get out of our way, BUT ensure that the
1504 * EOC bucket is inserted BEFORE an EOS bucket in bb as
1505 * some resource filters like mod_deflate pass everything
1506 * up to the EOS down the chain immediately and sent the
1507 * remainder of the brigade later (or even never). But in
1508 * this case the ap_http_header_filter does not get out of
1509 * our way soon enough.
1511 e = ap_bucket_eoc_create(c->bucket_alloc);
1512 eos = APR_BRIGADE_LAST(bb);
1513 while ((APR_BRIGADE_SENTINEL(bb) != eos)
1514 && !APR_BUCKET_IS_EOS(eos)) {
1515 eos = APR_BUCKET_PREV(eos);
1517 if (eos == APR_BRIGADE_SENTINEL(bb)) {
1518 APR_BRIGADE_INSERT_TAIL(bb, e);
1521 APR_BUCKET_INSERT_BEFORE(eos, e);
1523 ap_pass_brigade(r->output_filters, bb);
1524 /* Mark the backend connection for closing */
1526 /* Need to return OK to avoid sending an error message */
1529 else if (!c->keepalives) {
1530 ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
1531 "proxy: NOT Closing connection to client"
1532 " although reading from backend server %s:%d"
1533 " failed.", backend->hostname,
1536 return ap_proxyerror(r, HTTP_BAD_GATEWAY,
1537 "Error reading from remote server");
1539 /* XXX: Is this a real headers length send from remote? */
1540 backend->worker->s->read += len;
1542 /* Is it an HTTP/1 response?
1543 * This is buggy if we ever see an HTTP/1.10
1545 if (apr_date_checkmask(buffer, "HTTP/#.# ###*")) {
1548 major = buffer[5] - '0';
1549 minor = buffer[7] - '0';
1551 /* If not an HTTP/1 message or
1552 * if the status line was > 8192 bytes
1554 if ((major != 1) || (len >= sizeof(buffer)-1)) {
1555 return ap_proxyerror(r, HTTP_BAD_GATEWAY,
1556 apr_pstrcat(p, "Corrupt status line returned by remote "
1557 "server: ", buffer, NULL));
1561 keepchar = buffer[12];
1563 proxy_status = atoi(&buffer[9]);
1565 if (keepchar != '\0') {
1566 buffer[12] = keepchar;
1568 /* 2616 requires the space in Status-Line; the origin
1569 * server may have sent one but ap_rgetline_core will
1570 * have stripped it. */
1574 proxy_status_line = apr_pstrdup(p, &buffer[9]);
1576 /* The status out of the front is the same as the status coming in
1577 * from the back, until further notice.
1579 r->status = proxy_status;
1580 r->status_line = proxy_status_line;
1582 ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r,
1583 "Status from backend: %d", proxy_status);
1585 /* read the headers. */
1586 /* N.B. for HTTP/1.0 clients, we have to fold line-wrapped headers*/
1587 /* Also, take care with headers with multiple occurences. */
1589 /* First, tuck away all already existing cookies */
1590 save_table = apr_table_make(r->pool, 2);
1591 apr_table_do(addit_dammit, save_table, r->headers_out,
1592 "Set-Cookie", NULL);
1594 /* shove the headers direct into r->headers_out */
1595 ap_proxy_read_headers(r, backend->r, buffer, sizeof(buffer), origin,
1598 if (r->headers_out == NULL) {
1599 ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
1600 r->server, "proxy: bad HTTP/%d.%d header "
1601 "returned by %s (%s)", major, minor, r->uri,
1603 backend->close += 1;
1605 * ap_send_error relies on a headers_out to be present. we
1606 * are in a bad position here.. so force everything we send out
1607 * to have nothing to do with the incoming packet
1609 r->headers_out = apr_table_make(r->pool,1);
1610 r->status = HTTP_BAD_GATEWAY;
1611 r->status_line = "bad gateway";
1615 /* Now, add in the just read cookies */
1616 apr_table_do(addit_dammit, save_table, r->headers_out,
1617 "Set-Cookie", NULL);
1619 /* and now load 'em all in */
1620 if (!apr_is_empty_table(save_table)) {
1621 apr_table_unset(r->headers_out, "Set-Cookie");
1622 r->headers_out = apr_table_overlay(r->pool,
1627 /* can't have both Content-Length and Transfer-Encoding */
1628 if (apr_table_get(r->headers_out, "Transfer-Encoding")
1629 && apr_table_get(r->headers_out, "Content-Length")) {
1631 * 2616 section 4.4, point 3: "if both Transfer-Encoding
1632 * and Content-Length are received, the latter MUST be
1635 * To help mitigate HTTP Splitting, unset Content-Length
1636 * and shut down the backend server connection
1637 * XXX: We aught to treat such a response as uncachable
1639 apr_table_unset(r->headers_out, "Content-Length");
1640 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
1641 "proxy: server %s:%d returned Transfer-Encoding"
1642 " and Content-Length", backend->hostname,
1644 backend->close += 1;
1648 * Save a possible Transfer-Encoding header as we need it later for
1649 * ap_http_filter to know where to end.
1651 te = apr_table_get(r->headers_out, "Transfer-Encoding");
1652 /* strip connection listed hop-by-hop headers from response */
1653 backend->close += ap_proxy_liststr(apr_table_get(r->headers_out,
1656 ap_proxy_clear_connection(p, r->headers_out);
1657 if ((buf = apr_table_get(r->headers_out, "Content-Type"))) {
1658 ap_set_content_type(r, apr_pstrdup(p, buf));
1660 if (!ap_is_HTTP_INFO(proxy_status)) {
1661 ap_proxy_pre_http_request(origin, backend->r);
1664 /* Clear hop-by-hop headers */
1665 for (i=0; hop_by_hop_hdrs[i]; ++i) {
1666 apr_table_unset(r->headers_out, hop_by_hop_hdrs[i]);
1668 /* Delete warnings with wrong date */
1669 r->headers_out = ap_proxy_clean_warnings(p, r->headers_out);
1671 /* handle Via header in response */
1672 if (conf->viaopt != via_off && conf->viaopt != via_block) {
1673 const char *server_name = ap_get_server_name(r);
1674 /* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
1675 * then the server name returned by ap_get_server_name() is the
1676 * origin server name (which does make too much sense with Via: headers)
1677 * so we use the proxy vhost's name instead.
1679 if (server_name == r->hostname)
1680 server_name = r->server->server_hostname;
1681 /* create a "Via:" response header entry and merge it */
1682 apr_table_addn(r->headers_out, "Via",
1683 (conf->viaopt == via_full)
1684 ? apr_psprintf(p, "%d.%d %s%s (%s)",
1685 HTTP_VERSION_MAJOR(r->proto_num),
1686 HTTP_VERSION_MINOR(r->proto_num),
1689 AP_SERVER_BASEVERSION)
1690 : apr_psprintf(p, "%d.%d %s%s",
1691 HTTP_VERSION_MAJOR(r->proto_num),
1692 HTTP_VERSION_MINOR(r->proto_num),
1698 /* cancel keepalive if HTTP/1.0 or less */
1699 if ((major < 1) || (minor < 1)) {
1700 backend->close += 1;
1701 origin->keepalive = AP_CONN_CLOSE;
1704 /* an http/0.9 response */
1707 r->status_line = "200 OK";
1708 backend->close += 1;
1711 if (ap_is_HTTP_INFO(proxy_status)) {
1713 /* Reset to old timeout iff we've adjusted it */
1715 && (r->status == HTTP_CONTINUE)
1716 && (worker->s->ping_timeout != old_timeout)) {
1717 apr_socket_timeout_set(backend->sock, old_timeout);
1721 interim_response = 0;
1723 if (interim_response) {
1724 /* RFC2616 tells us to forward this.
1726 * OTOH, an interim response here may mean the backend
1727 * is playing sillybuggers. The Client didn't ask for
1728 * it within the defined HTTP/1.1 mechanisms, and if
1729 * it's an extension, it may also be unsupported by us.
1731 * There's also the possibility that changing existing
1732 * behaviour here might break something.
1734 * So let's make it configurable.
1736 const char *policy = apr_table_get(r->subprocess_env,
1737 "proxy-interim-response");
1738 ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
1739 "proxy: HTTP: received interim %d response",
1741 if (!policy || !strcasecmp(policy, "RFC")) {
1742 ap_send_interim_response(r, 1);
1744 /* FIXME: refine this to be able to specify per-response-status
1745 * policies and maybe also add option to bail out with 502
1747 else if (strcasecmp(policy, "Suppress")) {
1748 ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
1749 "undefined proxy interim response policy");
1752 /* Moved the fixups of Date headers and those affected by
1753 * ProxyPassReverse/etc from here to ap_proxy_read_headers
1756 if ((proxy_status == 401) && (dconf->error_override)) {
1758 const char *wa = "WWW-Authenticate";
1759 if ((buf = apr_table_get(r->headers_out, wa))) {
1760 apr_table_set(r->err_headers_out, wa, buf);
1762 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
1763 "proxy: origin server sent 401 without WWW-Authenticate header");
1769 * Is it an HTTP/0.9 response or did we maybe preread the 1st line of
1770 * the response? If so, load the extra data. These are 2 mutually
1771 * exclusive possibilities, that just happen to require very
1774 if (backasswards || pread_len) {
1775 apr_ssize_t cntr = (apr_ssize_t)pread_len;
1778 * At this point in response processing of a 0.9 response,
1779 * we don't know yet whether data is binary or not.
1780 * mod_charset_lite will get control later on, so it cannot
1781 * decide on the conversion of this buffer full of data.
1782 * However, chances are that we are not really talking to an
1783 * HTTP/0.9 server, but to some different protocol, therefore
1784 * the best guess IMHO is to always treat the buffer as "text/x":
1786 ap_xlate_proto_to_ascii(buffer, len);
1787 cntr = (apr_ssize_t)len;
1789 e = apr_bucket_heap_create(buffer, cntr, NULL, c->bucket_alloc);
1790 APR_BRIGADE_INSERT_TAIL(bb, e);
1792 /* PR 41646: get HEAD right with ProxyErrorOverride */
1793 if (ap_is_HTTP_ERROR(r->status) && dconf->error_override) {
1794 /* clear r->status for override error, otherwise ErrorDocument
1795 * thinks that this is a recursive error, and doesn't find the
1798 r->status = HTTP_OK;
1799 /* Discard body, if one is expected */
1800 if (!r->header_only && /* not HEAD request */
1801 (proxy_status != HTTP_NO_CONTENT) && /* not 204 */
1802 (proxy_status != HTTP_NOT_MODIFIED)) { /* not 304 */
1803 ap_discard_request_body(backend->r);
1805 return proxy_status;
1808 /* send body - but only if a body is expected */
1809 if ((!r->header_only) && /* not HEAD request */
1810 !interim_response && /* not any 1xx response */
1811 (proxy_status != HTTP_NO_CONTENT) && /* not 204 */
1812 (proxy_status != HTTP_NOT_MODIFIED)) { /* not 304 */
1814 /* We need to copy the output headers and treat them as input
1815 * headers as well. BUT, we need to do this before we remove
1816 * TE, so that they are preserved accordingly for
1817 * ap_http_filter to know where to end.
1819 backend->r->headers_in = apr_table_clone(backend->r->pool, r->headers_out);
1821 * Restore Transfer-Encoding header from response if we saved
1822 * one before and there is none left. We need it for the
1823 * ap_http_filter. See above.
1825 if (te && !apr_table_get(backend->r->headers_in, "Transfer-Encoding")) {
1826 apr_table_add(backend->r->headers_in, "Transfer-Encoding", te);
1829 apr_table_unset(r->headers_out,"Transfer-Encoding");
1831 ap_log_error(APLOG_MARK, APLOG_TRACE3, 0, r->server,
1832 "proxy: start body send");
1835 * if we are overriding the errors, we can't put the content
1836 * of the page into the brigade
1838 if (!dconf->error_override || !ap_is_HTTP_ERROR(proxy_status)) {
1839 /* read the body, pass it to the output filters */
1840 apr_read_type_e mode = APR_NONBLOCK_READ;
1843 /* Handle the case where the error document is itself reverse
1844 * proxied and was successful. We must maintain any previous
1845 * error status so that an underlying error (eg HTTP_NOT_FOUND)
1846 * doesn't become an HTTP_OK.
1848 if (dconf->error_override && !ap_is_HTTP_ERROR(proxy_status)
1849 && ap_is_HTTP_ERROR(original_status)) {
1850 r->status = original_status;
1851 r->status_line = original_status_line;
1855 apr_off_t readbytes;
1858 rv = ap_get_brigade(backend->r->input_filters, bb,
1859 AP_MODE_READBYTES, mode,
1860 conf->io_buffer_size);
1862 /* ap_get_brigade will return success with an empty brigade
1863 * for a non-blocking read which would block: */
1864 if (APR_STATUS_IS_EAGAIN(rv)
1865 || (rv == APR_SUCCESS && APR_BRIGADE_EMPTY(bb))) {
1866 /* flush to the client and switch to blocking mode */
1867 e = apr_bucket_flush_create(c->bucket_alloc);
1868 APR_BRIGADE_INSERT_TAIL(bb, e);
1869 if (ap_pass_brigade(r->output_filters, bb)
1874 apr_brigade_cleanup(bb);
1875 mode = APR_BLOCK_READ;
1878 else if (rv == APR_EOF) {
1881 else if (rv != APR_SUCCESS) {
1882 /* In this case, we are in real trouble because
1883 * our backend bailed on us. Pass along a 502 error
1886 ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c,
1887 "proxy: error reading response");
1888 ap_proxy_backend_broke(r, bb);
1889 ap_pass_brigade(r->output_filters, bb);
1894 /* next time try a non-blocking read */
1895 mode = APR_NONBLOCK_READ;
1897 apr_brigade_length(bb, 0, &readbytes);
1898 backend->worker->s->read += readbytes;
1901 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0,
1902 r->server, "proxy (PID %d): readbytes: %#x",
1903 getpid(), readbytes);
1907 if (APR_BRIGADE_EMPTY(bb)) {
1908 apr_brigade_cleanup(bb);
1912 /* Switch the allocator lifetime of the buckets */
1913 ap_proxy_buckets_lifetime_transform(r, bb, pass_bb);
1915 /* found the last brigade? */
1916 if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(pass_bb))) {
1918 /* signal that we must leave */
1921 /* the brigade may contain transient buckets that contain
1922 * data that lives only as long as the backend connection.
1923 * Force a setaside so these transient buckets become heap
1924 * buckets that live as long as the request.
1926 for (e = APR_BRIGADE_FIRST(pass_bb); e
1927 != APR_BRIGADE_SENTINEL(pass_bb); e
1928 = APR_BUCKET_NEXT(e)) {
1929 apr_bucket_setaside(e, r->pool);
1932 /* finally it is safe to clean up the brigade from the
1933 * connection pool, as we have forced a setaside on all
1936 apr_brigade_cleanup(bb);
1938 /* make sure we release the backend connection as soon
1939 * as we know we are done, so that the backend isn't
1940 * left waiting for a slow client to eventually
1941 * acknowledge the data.
1943 ap_proxy_release_connection(backend->worker->s->scheme,
1944 backend, r->server);
1945 /* Ensure that the backend is not reused */
1946 *backend_ptr = NULL;
1950 /* try send what we read */
1951 if (ap_pass_brigade(r->output_filters, pass_bb) != APR_SUCCESS
1953 /* Ack! Phbtt! Die! User aborted! */
1954 /* Only close backend if we haven't got all from the
1955 * backend. Furthermore if *backend_ptr is NULL it is no
1956 * longer safe to fiddle around with backend as it might
1957 * be already in use by another thread.
1960 backend->close = 1; /* this causes socket close below */
1965 /* make sure we always clean up after ourselves */
1966 apr_brigade_cleanup(pass_bb);
1967 apr_brigade_cleanup(bb);
1971 ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, r->server,
1972 "proxy: end body send");
1974 else if (!interim_response) {
1975 ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, r->server,
1976 "proxy: header only");
1978 /* make sure we release the backend connection as soon
1979 * as we know we are done, so that the backend isn't
1980 * left waiting for a slow client to eventually
1981 * acknowledge the data.
1983 ap_proxy_release_connection(backend->worker->s->scheme,
1984 backend, r->server);
1985 *backend_ptr = NULL;
1987 /* Pass EOS bucket down the filter chain. */
1988 e = apr_bucket_eos_create(c->bucket_alloc);
1989 APR_BRIGADE_INSERT_TAIL(bb, e);
1990 ap_pass_brigade(r->output_filters, bb);
1992 apr_brigade_cleanup(bb);
1994 } while (interim_response && (interim_response < AP_MAX_INTERIM_RESPONSES));
1996 /* See define of AP_MAX_INTERIM_RESPONSES for why */
1997 if (interim_response >= AP_MAX_INTERIM_RESPONSES) {
1998 return ap_proxyerror(r, HTTP_BAD_GATEWAY,
2000 "Too many (%d) interim responses from origin server",
2004 /* If our connection with the client is to be aborted, return DONE. */
2005 if (c->aborted || backend_broke) {
2013 apr_status_t ap_proxy_http_cleanup(const char *scheme, request_rec *r,
2014 proxy_conn_rec *backend)
2016 ap_proxy_release_connection(scheme, backend, r->server);
2021 * This handles http:// URLs, and other URLs using a remote proxy over http
2022 * If proxyhost is NULL, then contact the server directly, otherwise
2024 * Note that if a proxy is used, then URLs other than http: can be accessed,
2025 * also, if we have trouble which is clearly specific to the proxy, then
2026 * we return DECLINED so that we can try another proxy. (Or the direct
2029 static int proxy_http_handler(request_rec *r, proxy_worker *worker,
2030 proxy_server_conf *conf,
2031 char *url, const char *proxyname,
2032 apr_port_t proxyport)
2035 char server_portstr[32];
2037 const char *proxy_function;
2039 proxy_conn_rec *backend = NULL;
2041 conn_rec *c = r->connection;
2044 * Use a shorter-lived pool to reduce memory usage
2045 * and avoid a memory leak
2047 apr_pool_t *p = r->pool;
2048 apr_uri_t *uri = apr_palloc(p, sizeof(*uri));
2050 /* find the scheme */
2051 u = strchr(url, ':');
2052 if (u == NULL || u[1] != '/' || u[2] != '/' || u[3] == '\0')
2055 return HTTP_BAD_REQUEST;
2056 scheme = apr_pstrndup(p, url, u - url);
2057 /* scheme is lowercase */
2058 ap_str_tolower(scheme);
2060 if (strcmp(scheme, "https") == 0) {
2061 if (!ap_proxy_ssl_enable(NULL)) {
2062 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
2063 "proxy: HTTPS: declining URL %s"
2064 " (mod_ssl not configured?)", url);
2068 proxy_function = "HTTPS";
2070 else if (!(strcmp(scheme, "http") == 0 || (strcmp(scheme, "ftp") == 0 && proxyname))) {
2071 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
2072 "proxy: HTTP: declining URL %s", url);
2073 return DECLINED; /* only interested in HTTP, or FTP via proxy */
2077 proxy_function = "HTTP";
2079 proxy_function = "FTP";
2081 ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, r->server,
2082 "proxy: HTTP: serving URL %s", url);
2085 /* create space for state information */
2086 if ((status = ap_proxy_acquire_connection(proxy_function, &backend,
2087 worker, r->server)) != OK)
2091 backend->is_ssl = is_ssl;
2094 ap_proxy_ssl_connection_cleanup(backend, r);
2098 * In the case that we are handling a reverse proxy connection and this
2099 * is not a request that is coming over an already kept alive connection
2100 * with the client, do NOT reuse the connection to the backend, because
2101 * we cannot forward a failure to the client in this case as the client
2102 * does NOT expect this in this situation.
2103 * Yes, this creates a performance penalty.
2105 if ((r->proxyreq == PROXYREQ_REVERSE) && (!c->keepalives)
2106 && (apr_table_get(r->subprocess_env, "proxy-initial-not-pooled"))) {
2113 /* Step One: Determine Who To Connect To */
2114 if ((status = ap_proxy_determine_connection(p, r, conf, worker, backend,
2115 uri, &locurl, proxyname,
2116 proxyport, server_portstr,
2117 sizeof(server_portstr))) != OK)
2120 /* Step Two: Make the Connection */
2121 if (ap_proxy_connect_backend(proxy_function, backend, worker, r->server)) {
2122 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
2123 "proxy: HTTP: failed to make connection to backend: %s",
2125 status = HTTP_SERVICE_UNAVAILABLE;
2129 /* Step Three: Create conn_rec */
2130 if (!backend->connection) {
2131 if ((status = ap_proxy_connection_create(proxy_function, backend,
2132 c, r->server)) != OK)
2135 * On SSL connections set a note on the connection what CN is
2136 * requested, such that mod_ssl can check if it is requested to do
2140 apr_table_set(backend->connection->notes, "proxy-request-hostname",
2145 /* Step Four: Send the Request
2146 * On the off-chance that we forced a 100-Continue as a
2147 * kinda HTTP ping test, allow for retries
2149 if ((status = ap_proxy_http_request(p, r, backend, worker,
2150 conf, uri, locurl, server_portstr)) != OK) {
2151 if ((status == HTTP_SERVICE_UNAVAILABLE) && worker->s->ping_timeout_set) {
2153 ap_log_error(APLOG_MARK, APLOG_INFO, status, r->server,
2154 "proxy: HTTP: 100-Continue failed to %pI (%s)",
2155 worker->cp->addr, worker->s->hostname);
2164 /* Step Five: Receive the Response... Fall thru to cleanup */
2165 status = ap_proxy_http_process_response(p, r, &backend, worker,
2166 conf, server_portstr);
2171 /* Step Six: Clean Up */
2176 ap_proxy_http_cleanup(proxy_function, r, backend);
2180 static void ap_proxy_http_register_hook(apr_pool_t *p)
2182 proxy_hook_scheme_handler(proxy_http_handler, NULL, NULL, APR_HOOK_FIRST);
2183 proxy_hook_canon_handler(proxy_http_canon, NULL, NULL, APR_HOOK_FIRST);
2184 warn_rx = ap_pregcomp(p, "[0-9]{3}[ \t]+[^ \t]+[ \t]+\"[^\"]*\"([ \t]+\"([^\"]+)\")?", 0);
2187 AP_DECLARE_MODULE(proxy_http) = {
2188 STANDARD20_MODULE_STUFF,
2189 NULL, /* create per-directory config structure */
2190 NULL, /* merge per-directory config structures */
2191 NULL, /* create per-server config structure */
2192 NULL, /* merge per-server config structures */
2193 NULL, /* command apr_table_t */
2194 ap_proxy_http_register_hook/* register hooks */