1 /* Copyright 1999-2005 The Apache Software Foundation or its licensors, as
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * 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.
22 * @brief Proxy Extension Module for Apache
24 * @defgroup MOD_PROXY mod_proxy
25 * @ingroup APACHE_MODS
31 Also note numerous FIXMEs and CHECKMEs which should be eliminated.
33 This code is once again experimental!
37 1. Make it completely work (for FTP too)
41 Chuck Murcko <chuck@topsail.org> 02-06-01
47 #include "apr_hooks.h"
50 #include "apr_strings.h"
51 #include "apr_buckets.h"
53 #include "apr_network_io.h"
54 #include "apr_pools.h"
55 #include "apr_strings.h"
58 #include "apr_strmatch.h"
59 #include "apr_fnmatch.h"
60 #include "apr_reslist.h"
61 #define APR_WANT_STRFUNC
65 #include "http_config.h"
66 #include "ap_config.h"
67 #include "http_core.h"
68 #include "http_protocol.h"
69 #include "http_request.h"
70 #include "http_vhost.h"
71 #include "http_main.h"
73 #include "http_connection.h"
74 #include "util_filter.h"
75 #include "util_ebcdic.h"
76 #include "ap_provider.h"
78 #if APR_HAVE_NETINET_IN_H
79 #include <netinet/in.h>
81 #if APR_HAVE_ARPA_INET_H
82 #include <arpa/inet.h>
85 /* for proxy_canonenc() */
87 enc_path, enc_search, enc_user, enc_fpath, enc_parm
90 #if APR_CHARSET_EBCDIC
92 #else /*APR_CHARSET_EBCDIC*/
93 #define CRLF "\015\012"
94 #endif /*APR_CHARSET_EBCDIC*/
96 /* default Max-Forwards header setting */
97 #define DEFAULT_MAX_FORWARDS 10
99 /* static information about a remote proxy */
100 struct proxy_remote {
101 const char *scheme; /* the schemes handled by this proxy, or '*' */
102 const char *protocol; /* the scheme used to talk to this proxy */
103 const char *hostname; /* the hostname of this proxy */
104 apr_port_t port; /* the port for this proxy */
105 ap_regex_t *regexp; /* compiled regex (if any) for the remote */
106 int use_regex; /* simple boolean. True if we have a regex pattern */
114 struct dirconn_entry {
116 struct in_addr addr, mask;
117 struct apr_sockaddr_t *hostaddr;
118 int (*matcher) (struct dirconn_entry * This, request_rec *r);
121 struct noproxy_entry {
123 struct apr_sockaddr_t *addr;
126 typedef struct proxy_balancer proxy_balancer;
127 typedef struct proxy_worker proxy_worker;
128 typedef struct proxy_conn_pool proxy_conn_pool;
129 typedef struct proxy_balancer_method proxy_balancer_method;
132 apr_array_header_t *proxies;
133 apr_array_header_t *sec_proxy;
134 apr_array_header_t *aliases;
135 apr_array_header_t *noproxies;
136 apr_array_header_t *dirconn;
137 apr_array_header_t *allowed_connect_ports;
138 apr_array_header_t *workers;
139 apr_array_header_t *balancers;
140 proxy_worker *forward; /* forward proxy worker */
141 proxy_worker *reverse; /* reverse "module-driven" proxy worker */
142 const char *domain; /* domain name to use in absence of a domain name in the request */
143 int req; /* true if proxy requests are enabled */
150 } viaopt; /* how to deal with proxy Via: headers */
152 apr_size_t recv_buffer_size;
153 char recv_buffer_size_set;
154 apr_size_t io_buffer_size;
155 char io_buffer_size_set;
159 * the following setting masks the error page
160 * returned from the 'proxied server' and just
161 * forwards the status code upwards.
162 * This allows the main server (us) to generate
163 * the error page, (so it will look like a error
164 * returned from the rest of the system
167 int error_override_set;
169 int preserve_host_set;
170 apr_interval_time_t timeout;
176 } badopt; /* how to deal with bad headers */
178 /* putting new stuff on the end maximises binary back-compatibility.
179 * the strmatch_patterns are really a const just to have a
180 * case-independent strstr.
186 } proxy_status; /* Status display options */
187 char proxy_status_set;
188 apr_pool_t *pool; /* Pool used for allocating this struct */
193 const char *p; /* The path */
194 int p_is_fnmatch; /* Is this path an fnmatch candidate? */
195 ap_regex_t *r; /* Is this a regex? */
197 /* ProxyPassReverse and friends are documented as working inside
198 * <Location>. But in fact they never have done in the case of
199 * more than one <Location>, because the server_conf can't see it.
200 * We need to move them to the per-dir config.
201 * Discussed in February:
202 * http://marc.theaimsgroup.com/?l=apache-httpd-dev&m=110726027118798&w=2
204 apr_array_header_t *raliases;
205 apr_array_header_t* cookie_paths;
206 apr_array_header_t* cookie_domains;
207 const apr_strmatch_pattern* cookie_path_str;
208 const apr_strmatch_pattern* cookie_domain_str;
212 conn_rec *connection;
213 const char *hostname;
216 apr_pool_t *pool; /* Subpool used for creating socket */
217 apr_socket_t *sock; /* Connection socket */
218 apr_sockaddr_t *addr; /* Preparsed remote address info */
219 apr_uint32_t flags; /* Conection flags */
220 int close; /* Close 'this' connection */
221 int close_on_recycle; /* Close the connection when returning to pool */
222 proxy_worker *worker; /* Connection pool this connection belogns to */
223 void *data; /* per scheme connection data */
225 int inreslist; /* connection in apr_reslist? */
230 float cache_completion; /* completion percentage */
231 int content_length; /* length of the content */
234 /* Connection pool */
235 struct proxy_conn_pool {
236 apr_pool_t *pool; /* The pool used in constructor and destructor calls */
237 apr_sockaddr_t *addr; /* Preparsed remote address info */
239 apr_reslist_t *res; /* Connection resource list */
241 proxy_conn_rec *conn; /* Single connection for prefork mpm's */
244 /* woker status flags */
245 #define PROXY_WORKER_INITIALIZED 0x0001
246 #define PROXY_WORKER_IGNORE_ERRORS 0x0002
247 #define PROXY_WORKER_IN_SHUTDOWN 0x0010
248 #define PROXY_WORKER_DISABLED 0x0020
249 #define PROXY_WORKER_STOPPED 0x0040
250 #define PROXY_WORKER_IN_ERROR 0x0080
252 #define PROXY_WORKER_IS_USABLE(f) (!((f)->s->status & 0x00F0))
254 /* default worker retry timeout in seconds */
255 #define PROXY_WORKER_DEFAULT_RETRY 60
256 #define PROXY_WORKER_MAX_ROUTE_SIZ 63
258 /* Runtime worker status informations. Shared in scoreboard */
261 apr_time_t error_time; /* time of the last error */
262 int retries; /* number of retries on this worker */
263 int lbstatus; /* Current lbstatus */
264 int lbfactor; /* dynamic lbfactor */
265 apr_off_t transferred;/* Number of bytes transferred to remote */
266 apr_off_t read; /* Number of bytes read from remote */
267 apr_size_t elected; /* Number of times the worker was elected */
268 char route[PROXY_WORKER_MAX_ROUTE_SIZ+1];
269 char redirect[PROXY_WORKER_MAX_ROUTE_SIZ+1];
270 void *context; /* general purpose storage */
273 /* Worker configuration */
274 struct proxy_worker {
275 int id; /* scoreboard id */
276 apr_interval_time_t retry; /* retry interval */
277 int lbfactor; /* initial load balancing factor */
279 const char *scheme; /* scheme to use ajp|http|https */
280 const char *hostname; /* remote backend address */
281 const char *route; /* balancing route */
282 const char *redirect; /* temporary balancing redirection route */
283 int status; /* temporary worker status */
285 int min; /* Desired minimum number of available connections */
286 int smax; /* Soft maximum on the total number of connections */
287 int hmax; /* Hard maximum on the total number of connections */
288 apr_interval_time_t ttl; /* maximum amount of time in seconds a connection
289 * may be available while exceeding the soft limit */
290 apr_interval_time_t timeout; /* connection timeout */
292 apr_interval_time_t acquire; /* acquire timeout when the maximum number of connections is exceeded */
294 apr_size_t recv_buffer_size;
295 char recv_buffer_size_set;
296 apr_size_t io_buffer_size;
297 char io_buffer_size_set;
300 proxy_conn_pool *cp; /* Connection pool to use */
301 proxy_worker_stat *s; /* Shared data */
302 void *opaque; /* per scheme worker data */
303 int is_address_reusable;
305 apr_thread_mutex_t *mutex; /* Thread lock for updating address cache */
307 void *context; /* general purpose storage */
312 } flush_packets; /* control AJP flushing */
313 int flush_wait; /* poll wait time in microseconds if flush_auto */
317 * Wait 10000 microseconds to find out if more data is currently
318 * available at the backend. Just an arbitrary choose.
320 #define PROXY_FLUSH_WAIT 10000
322 struct proxy_balancer {
323 apr_array_header_t *workers; /* array of proxy_workers */
324 const char *name; /* name of the load balancer */
325 const char *sticky; /* sticky session identifier */
326 int sticky_force; /* Disable failover for sticky sessions */
327 apr_interval_time_t timeout; /* Timeout for waiting on free connection */
328 int max_attempts; /* Number of attempts before failing */
329 char max_attempts_set;
330 proxy_balancer_method *lbmethod;
332 /* XXX: Perhaps we will need the proc mutex too.
333 * Altrough we are only using arithmetic operations
334 * it may lead to a incorrect calculations.
335 * For now use only the thread mutex.
338 apr_thread_mutex_t *mutex; /* Thread lock for updating lb params */
340 void *context; /* general purpose storage */
343 struct proxy_balancer_method {
344 const char *name; /* name of the load balancer method*/
345 proxy_worker *(*finder)(proxy_balancer *balancer,
347 void *context; /* general purpose storage */
351 #define PROXY_THREAD_LOCK(x) apr_thread_mutex_lock((x)->mutex)
352 #define PROXY_THREAD_UNLOCK(x) apr_thread_mutex_unlock((x)->mutex)
354 #define PROXY_THREAD_LOCK(x) APR_SUCCESS
355 #define PROXY_THREAD_UNLOCK(x) APR_SUCCESS
360 /* Create a set of PROXY_DECLARE(type), PROXY_DECLARE_NONSTD(type) and
361 * PROXY_DECLARE_DATA with appropriate export and import tags for the platform
364 #define PROXY_DECLARE(type) type
365 #define PROXY_DECLARE_NONSTD(type) type
366 #define PROXY_DECLARE_DATA
367 #elif defined(PROXY_DECLARE_STATIC)
368 #define PROXY_DECLARE(type) type __stdcall
369 #define PROXY_DECLARE_NONSTD(type) type
370 #define PROXY_DECLARE_DATA
371 #elif defined(PROXY_DECLARE_EXPORT)
372 #define PROXY_DECLARE(type) __declspec(dllexport) type __stdcall
373 #define PROXY_DECLARE_NONSTD(type) __declspec(dllexport) type
374 #define PROXY_DECLARE_DATA __declspec(dllexport)
376 #define PROXY_DECLARE(type) __declspec(dllimport) type __stdcall
377 #define PROXY_DECLARE_NONSTD(type) __declspec(dllimport) type
378 #define PROXY_DECLARE_DATA __declspec(dllimport)
382 * Hook an optional proxy hook. Unlike static hooks, this uses a macro
383 * instead of a function.
385 #define PROXY_OPTIONAL_HOOK(name,fn,pre,succ,order) \
386 APR_OPTIONAL_HOOK(proxy,name,fn,pre,succ,order)
388 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, scheme_handler, (request_rec *r,
389 proxy_worker *worker, proxy_server_conf *conf, char *url,
390 const char *proxyhost, apr_port_t proxyport))
391 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, canon_handler, (request_rec *r,
394 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, create_req, (request_rec *r, request_rec *pr))
395 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, fixups, (request_rec *r))
399 * It will return the most suitable worker at the moment
400 * and coresponding balancer.
401 * The url is rewritten from balancer://cluster/uri to scheme://host:port/uri
402 * and then the scheme_handler is called.
405 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, pre_request, (proxy_worker **worker,
406 proxy_balancer **balancer,
408 proxy_server_conf *conf, char **url))
411 * It is called after request for updating runtime balancer status.
413 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, post_request, (proxy_worker *worker,
414 proxy_balancer *balancer, request_rec *r,
415 proxy_server_conf *conf))
418 * request status hook
419 * It is called after all proxy processing has been done. This gives other
420 * modules a chance to create default content on failure, for example
422 APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, request_status,
423 (int *status, request_rec *r))
427 PROXY_DECLARE(request_rec *)ap_proxy_make_fake_req(conn_rec *c, request_rec *r);
428 PROXY_DECLARE(int) ap_proxy_hex2c(const char *x);
429 PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x);
430 PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len, enum enctype t,
431 int forcedec, int proxyreq);
432 PROXY_DECLARE(char *)ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp,
433 char **passwordp, char **hostp, apr_port_t *port);
434 PROXY_DECLARE(const char *)ap_proxy_date_canon(apr_pool_t *p, const char *x);
435 PROXY_DECLARE(int) ap_proxy_liststr(const char *list, const char *val);
436 PROXY_DECLARE(char *)ap_proxy_removestr(apr_pool_t *pool, const char *list, const char *val);
437 PROXY_DECLARE(int) ap_proxy_hex2sec(const char *x);
438 PROXY_DECLARE(void) ap_proxy_sec2hex(int t, char *y);
439 PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message);
440 PROXY_DECLARE(int) ap_proxy_is_ipaddr(struct dirconn_entry *This, apr_pool_t *p);
441 PROXY_DECLARE(int) ap_proxy_is_domainname(struct dirconn_entry *This, apr_pool_t *p);
442 PROXY_DECLARE(int) ap_proxy_is_hostname(struct dirconn_entry *This, apr_pool_t *p);
443 PROXY_DECLARE(int) ap_proxy_is_word(struct dirconn_entry *This, apr_pool_t *p);
444 PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf, apr_sockaddr_t *uri_addr);
445 PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r);
446 PROXY_DECLARE(apr_status_t) ap_proxy_string_read(conn_rec *c, apr_bucket_brigade *bb, char *buff, size_t bufflen, int *eos);
447 PROXY_DECLARE(void) ap_proxy_table_unmerge(apr_pool_t *p, apr_table_t *t, char *key);
448 /* DEPRECATED (will be replaced with ap_proxy_connect_backend */
449 PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **, const char *, apr_sockaddr_t *, const char *, proxy_server_conf *, server_rec *, apr_pool_t *);
450 PROXY_DECLARE(int) ap_proxy_ssl_enable(conn_rec *c);
451 PROXY_DECLARE(int) ap_proxy_ssl_disable(conn_rec *c);
452 PROXY_DECLARE(int) ap_proxy_conn_is_https(conn_rec *c);
453 PROXY_DECLARE(const char *) ap_proxy_ssl_val(apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r, const char *var);
455 /* Header mapping functions, and a typedef of their signature */
456 PROXY_DECLARE(const char *) ap_proxy_location_reverse_map(request_rec *r, proxy_dir_conf *conf, const char *url);
457 PROXY_DECLARE(const char *) ap_proxy_cookie_reverse_map(request_rec *r, proxy_dir_conf *conf, const char *str);
460 typedef const char *(*ap_proxy_header_reverse_map_fn)(request_rec *,
461 proxy_dir_conf *, const char *);
462 #elif defined(PROXY_DECLARE_STATIC)
463 typedef const char *(__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
464 proxy_dir_conf *, const char *);
465 #elif defined(PROXY_DECLARE_EXPORT)
466 typedef __declspec(dllexport) const char *
467 (__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
468 proxy_dir_conf *, const char *);
470 typedef __declspec(dllimport) const char *
471 (__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
472 proxy_dir_conf *, const char *);
476 /* Connection pool API */
478 * Get the worker from proxy configuration
479 * @param p memory pool used for finding worker
480 * @param conf current proxy server configuration
481 * @param url url to find the worker from
482 * @return proxy_worker or NULL if not found
484 PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p,
485 proxy_server_conf *conf,
488 * Add the worker to proxy configuration
489 * @param worker the new worker
490 * @param p memory pool to allocate worker from
491 * @param conf current proxy server configuration
492 * @param url url containing worker name
493 * @return error message or NULL if successfull
495 PROXY_DECLARE(const char *) ap_proxy_add_worker(proxy_worker **worker,
497 proxy_server_conf *conf,
502 * @param p memory pool to allocate worker from
505 PROXY_DECLARE(proxy_worker *) ap_proxy_create_worker(apr_pool_t *p);
508 * Initize the worker's shared data
509 * @param conf current proxy server configuration
510 * @param worker worker to initialize
511 * @param s current server record
512 * @param worker worker to initialize
514 PROXY_DECLARE(void) ap_proxy_initialize_worker_share(proxy_server_conf *conf,
515 proxy_worker *worker,
521 * @param worker worker to initialize
522 * @param s current server record
523 * @return APR_SUCCESS or error code
525 PROXY_DECLARE(apr_status_t) ap_proxy_initialize_worker(proxy_worker *worker,
528 * Get the balancer from proxy configuration
529 * @param p memory pool used for finding balancer
530 * @param conf current proxy server configuration
531 * @param url url to find the worker from. Has to have balancer:// prefix
532 * @return proxy_balancer or NULL if not found
534 PROXY_DECLARE(proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p,
535 proxy_server_conf *conf,
538 * Add the balancer to proxy configuration
539 * @param balancer the new balancer
540 * @param p memory pool to allocate balancer from
541 * @param conf current proxy server configuration
542 * @param url url containing balancer name
543 * @return error message or NULL if successfull
545 PROXY_DECLARE(const char *) ap_proxy_add_balancer(proxy_balancer **balancer,
547 proxy_server_conf *conf,
551 * Add the worker to the balancer
552 * @param pool memory pool for adding worker
553 * @param balancer balancer to add to
554 * @param balancer worker to add
555 * @note Single worker can be added to multiple balancers.
557 PROXY_DECLARE(void) ap_proxy_add_worker_to_balancer(apr_pool_t *pool,
558 proxy_balancer *balancer,
559 proxy_worker *worker);
561 * Get the most suitable worker and(or) balancer for the request
562 * @param worker worker used for processing request
563 * @param balancer balancer used for processing request
564 * @param r current request
565 * @param conf current proxy server configuration
566 * @param url request url that balancer can rewrite.
567 * @return OK or HTTP_XXX error
568 * @note It calls balancer pre_request hook if the url starts with balancer://
569 * The balancer then rewrites the url to particular worker, like http://host:port
571 PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
572 proxy_balancer **balancer,
574 proxy_server_conf *conf,
577 * Post request worker and balancer cleanup
578 * @param worker worker used for processing request
579 * @param balancer balancer used for processing request
580 * @param r current request
581 * @param conf current proxy server configuration
582 * @return OK or HTTP_XXX error
583 * @note When ever the pre_request is called, the post_request has to be
586 PROXY_DECLARE(int) ap_proxy_post_request(proxy_worker *worker,
587 proxy_balancer *balancer,
589 proxy_server_conf *conf);
592 * Request status function
593 * @param status status of proxy request
594 * @return OK or DECLINED
596 PROXY_DECLARE(int) ap_proxy_request_status(int *status, request_rec *r);
599 * Deternime backend hostname and port
600 * @param p memory pool used for processing
601 * @param r current request
602 * @param conf current proxy server configuration
603 * @param worker worker used for processing request
604 * @param conn proxy connection struct
605 * @param uri processed uri
606 * @param url request url
607 * @param proxyname are we connecting directly or via s proxy
608 * @param proxyport proxy host port
609 * @param server_portstr Via headers server port
610 * @param server_portstr_size size of the server_portstr buffer
611 * @return OK or HTTP_XXX error
613 PROXY_DECLARE(int) ap_proxy_determine_connection(apr_pool_t *p, request_rec *r,
614 proxy_server_conf *conf,
615 proxy_worker *worker,
616 proxy_conn_rec *conn,
619 const char *proxyname,
620 apr_port_t proxyport,
621 char *server_portstr,
622 int server_portstr_size);
624 * Mark a worker for retry
625 * @param proxy_function calling proxy scheme (http, ajp, ...)
626 * @param conf current proxy server configuration
627 * @param worker worker used for retrying
628 * @param s current server record
629 * @return OK if marked for retry, DECLINED otherwise
630 * @note Worker will be marker for retry if the time of the last retry
631 * has been ellapsed. In case there is no retry option set, defaults to
632 * number_of_retries seconds.
634 PROXY_DECLARE(int) ap_proxy_retry_worker(const char *proxy_function,
635 proxy_worker *worker,
638 * Acquire a connection from workers connection pool
639 * @param proxy_function calling proxy scheme (http, ajp, ...)
640 * @param conn acquired connection
641 * @param worker worker used for obtaining connection
642 * @param s current server record
643 * @return OK or HTTP_XXX error
644 * @note If the number of connections is exhaused the function will
645 * block untill the timeout is reached.
647 PROXY_DECLARE(int) ap_proxy_acquire_connection(const char *proxy_function,
648 proxy_conn_rec **conn,
649 proxy_worker *worker,
652 * Release a connection back to worker connection pool
653 * @param proxy_function calling proxy scheme (http, ajp, ...)
654 * @param conn acquired connection
655 * @param s current server record
656 * @return OK or HTTP_XXX error
657 * @note The connection will be closed if conn->close_on_release is set
659 PROXY_DECLARE(int) ap_proxy_release_connection(const char *proxy_function,
660 proxy_conn_rec *conn,
663 * Make a connection to the backend
664 * @param proxy_function calling proxy scheme (http, ajp, ...)
665 * @param conn acquired connection
666 * @param worker connection worker
667 * @param s current server record
668 * @return OK or HTTP_XXX error
669 * @note In case the socket already exists for conn, just check the link
672 PROXY_DECLARE(int) ap_proxy_connect_backend(const char *proxy_function,
673 proxy_conn_rec *conn,
674 proxy_worker *worker,
677 * Make a connection record for backend connection
678 * @param proxy_function calling proxy scheme (http, ajp, ...)
679 * @param conn acquired connection
680 * @param c client connection record
681 * @param s current server record
682 * @return OK or HTTP_XXX error
684 PROXY_DECLARE(int) ap_proxy_connection_create(const char *proxy_function,
685 proxy_conn_rec *conn,
686 conn_rec *c, server_rec *s);
688 * Signal the upstream chain that the connection to the backend broke in the
689 * middle of the response. This is done by sending an error bucket with
690 * status HTTP_BAD_GATEWAY and an EOS bucket up the filter chain.
691 * @param r current request record of client request
692 * @param brigade The brigade that is sent through the output filter chain
694 PROXY_DECLARE(void) ap_proxy_backend_broke(request_rec *r,
695 apr_bucket_brigade *brigade);
698 #if MODULE_MAGIC_NUMBER_MAJOR > 20020903
699 #define PROXY_HAS_SCOREBOARD 1
701 #define PROXY_HAS_SCOREBOARD 0
704 #define PROXY_LBMETHOD "proxylbmethod"
706 /* The number of dynamic workers that can be added when reconfiguring.
707 * If this limit is reached you must stop and restart the server.
709 #define PROXY_DYNAMIC_BALANCER_LIMIT 16
711 * Calculate number of maximum number of workers in scoreboard.
712 * @return number of workers to allocate in the scoreboard
714 int ap_proxy_lb_workers(void);
717 extern module PROXY_DECLARE_DATA proxy_module;
719 extern int PROXY_DECLARE_DATA proxy_lb_workers;
721 #endif /*MOD_PROXY_H*/