Mercurial > hg > nginx
view src/http/modules/proxy/ngx_http_proxy_handler.c @ 170:c42be4185301
nginx-0.0.1-2003-11-03-01:56:18 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Sun, 02 Nov 2003 22:56:18 +0000 |
parents | edf29bb717da |
children | aff0e5d32af8 |
line wrap: on
line source
#include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> #include <ngx_http_proxy_handler.h> static int ngx_http_proxy_handler(ngx_http_request_t *r); static int ngx_http_proxy_request_upstream(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_init_request(void *data); static ngx_chain_t *ngx_http_proxy_create_request(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_send_request_handler(ngx_event_t *wev); static void ngx_http_proxy_connect(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_send_request(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_process_upstream_status_line(ngx_event_t *rev); static void ngx_http_proxy_process_upstream_headers(ngx_event_t *rev); static ssize_t ngx_http_proxy_read_upstream_header(ngx_http_proxy_ctx_t *); static void ngx_http_proxy_send_response(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_process_body(ngx_event_t *ev); static int ngx_http_proxy_update_cache(ngx_http_proxy_ctx_t *p); static void ngx_http_proxy_next_upstream(ngx_http_proxy_ctx_t *p, int ft_type); static int ngx_http_proxy_log_state(ngx_http_proxy_ctx_t *p, int status); static void ngx_http_proxy_finalize_request(ngx_http_proxy_ctx_t *p, int rc); static void ngx_http_proxy_close_connection(ngx_connection_t *c); static size_t ngx_http_proxy_log_error(void *data, char *buf, size_t len); static int ngx_http_proxy_init(ngx_cycle_t *cycle); static void *ngx_http_proxy_create_loc_conf(ngx_conf_t *cf); static char *ngx_http_proxy_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_http_proxy_set_pass(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_http_proxy_parse_upstream(ngx_str_t *url, ngx_http_proxy_upstream_t *u); static ngx_conf_bitmask_t next_upstream_masks[] = { { ngx_string("error"), NGX_HTTP_PROXY_FT_ERROR }, { ngx_string("timeout"), NGX_HTTP_PROXY_FT_TIMEOUT }, { ngx_string("invalid_header"), NGX_HTTP_PROXY_FT_INVALID_HEADER }, { ngx_string("http_500"), NGX_HTTP_PROXY_FT_HTTP_500 }, { ngx_string("http_404"), NGX_HTTP_PROXY_FT_HTTP_404 }, { ngx_null_string, 0 } }; static ngx_conf_bitmask_t use_stale_masks[] = { { ngx_string("error"), NGX_HTTP_PROXY_FT_ERROR }, { ngx_string("timeout"), NGX_HTTP_PROXY_FT_TIMEOUT }, { ngx_string("invalid_header"), NGX_HTTP_PROXY_FT_INVALID_HEADER }, { ngx_string("http_500"), NGX_HTTP_PROXY_FT_HTTP_500 }, { ngx_string("busy_lock"), NGX_HTTP_PROXY_FT_BUSY_LOCK }, { ngx_string("max_waiting"), NGX_HTTP_PROXY_FT_MAX_WAITING }, { ngx_null_string, 0 } }; static ngx_command_t ngx_http_proxy_commands[] = { { ngx_string("proxy_pass"), NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_http_proxy_set_pass, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, { ngx_string("proxy_request_buffer_size"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, request_buffer_size), NULL }, { ngx_string("proxy_connect_timeout"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_msec_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, connect_timeout), NULL }, { ngx_string("proxy_send_timeout"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_msec_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, send_timeout), NULL }, { ngx_string("proxy_header_buffer_size"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, header_buffer_size), NULL }, { ngx_string("proxy_read_timeout"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_msec_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, read_timeout), NULL }, { ngx_string("proxy_buffers"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, ngx_conf_set_bufs_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, bufs), NULL }, { ngx_string("proxy_busy_buffers_size"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, busy_buffers_size), NULL }, { ngx_string("proxy_cache_path"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1234, ngx_conf_set_path_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, cache_path), NULL }, { ngx_string("proxy_temp_path"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1234, ngx_conf_set_path_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, temp_path), NULL }, { ngx_string("proxy_temp_file_write_size"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, temp_file_write_size), NULL }, { ngx_string("proxy_cache"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, cache), NULL }, { ngx_string("proxy_pass_server"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, pass_server), NULL }, { ngx_string("proxy_next_upstream"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_ANY, ngx_conf_set_bitmask_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, next_upstream), &next_upstream_masks }, { ngx_string("proxy_use_stale"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_ANY, ngx_conf_set_bitmask_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_proxy_loc_conf_t, use_stale), &use_stale_masks }, ngx_null_command }; ngx_http_module_t ngx_http_proxy_module_ctx = { NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_proxy_create_loc_conf, /* create location configration */ ngx_http_proxy_merge_loc_conf /* merge location configration */ }; ngx_module_t ngx_http_proxy_module = { NGX_MODULE, &ngx_http_proxy_module_ctx, /* module context */ ngx_http_proxy_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init module */ NULL /* init child */ }; static ngx_str_t http_methods[] = { ngx_string("GET "), ngx_string("HEAD "), ngx_string("POST ") }; static char *upstream_header_errors[] = { "upstream sent invalid header", "upstream sent too long header line" }; ngx_http_header_t ngx_http_proxy_headers_in[] = { { ngx_string("Date"), offsetof(ngx_http_proxy_headers_in_t, date) }, { ngx_string("Server"), offsetof(ngx_http_proxy_headers_in_t, server) }, { ngx_string("Connection"), offsetof(ngx_http_proxy_headers_in_t, connection) }, { ngx_string("Content-Type"), offsetof(ngx_http_proxy_headers_in_t, content_type) }, { ngx_string("Content-Length"), offsetof(ngx_http_proxy_headers_in_t, content_length) }, { ngx_string("Last-Modified"), offsetof(ngx_http_proxy_headers_in_t, last_modified) }, { ngx_string("Accept-Ranges"), offsetof(ngx_http_proxy_headers_in_t, accept_ranges) }, { ngx_null_string, 0 } }; static char http_version[] = " HTTP/1.0" CRLF; static char host_header[] = "Host: "; static char connection_close_header[] = "Connection: close" CRLF; static int ngx_http_proxy_handler(ngx_http_request_t *r) { int rc; char *last; ngx_http_cache_ctx_t *cctx; ngx_http_proxy_ctx_t *p; ngx_http_proxy_upstream_t *u; ngx_http_create_ctx(r, p, ngx_http_proxy_module, sizeof(ngx_http_proxy_ctx_t), NGX_HTTP_INTERNAL_SERVER_ERROR); p->lcf = ngx_http_get_module_loc_conf(r, ngx_http_proxy_module); p->request = r; /* TODO: we currently support reverse proxy only */ p->accel = 1; if (!p->lcf->cache || r->bypass_cache) { return ngx_http_proxy_request_upstream(p); } rc = ngx_http_proxy_get_cached_response(p); if (rc == NGX_OK) { return ngx_http_proxy_process_cached_response(p); } if (rc == NGX_HTTP_INTERNAL_SERVER_ERROR) { return rc; } if (rc == NGX_DECLINED || rc == NGX_STALE) { return ngx_http_proxy_request_upstream(p); } return NGX_DONE; } static int ngx_http_proxy_request_upstream(ngx_http_proxy_ctx_t *p) { ngx_http_request_t *r; r = p->request; p->upstream.peers = p->lcf->peers; p->upstream.tries = p->lcf->peers->number; ngx_init_array(p->states, r->pool, p->upstream.tries, sizeof(ngx_http_proxy_state_t), NGX_HTTP_INTERNAL_SERVER_ERROR); p->method = r->method; /* STUB */ p->cachable = p->lcf->cache; if (r->headers_in.content_length_n > 0) { if (!(r->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)))) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } r->temp_file->file.fd = NGX_INVALID_FILE; r->temp_file->file.log = r->connection->log; r->temp_file->path = p->lcf->temp_path; r->temp_file->pool = r->pool; r->temp_file->warn = "a client request body is buffered " "to a temporary file"; /* r->temp_file->persistent = 0; */ r->request_body_handler = ngx_http_proxy_init_request; r->data = p; /* TODO: we ignore return value of ngx_http_read_client_request_body, probably we should not return anything */ ngx_http_read_client_request_body(r, p->lcf->request_buffer_size); return NGX_DONE; } ngx_http_proxy_init_request(p); return NGX_DONE; } static void ngx_http_proxy_init_request(void *data) { ngx_http_proxy_ctx_t *p = data; ngx_chain_t *cl; ngx_http_request_t *r; ngx_output_chain_ctx_t *octx; ngx_chain_writer_ctx_t *wctx; r = p->request; ngx_log_debug(r->connection->log, "timer_set: %d" _ r->connection->read->timer_set); if (r->connection->read->timer_set) { ngx_del_timer(r->connection->read); } if (!(cl = ngx_http_proxy_create_request(p))) { ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } if (r->request_hunks) { cl->next = r->request_hunks; } r->request_hunks = cl; p->upstream.log = r->connection->log; p->saved_ctx = r->connection->log->data; p->saved_handler = r->connection->log->handler; r->connection->log->data = p; r->connection->log->handler = ngx_http_proxy_log_error; p->action = "connecting to upstream"; if (!(octx = ngx_pcalloc(r->pool, sizeof(ngx_output_chain_ctx_t)))) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } p->output_chain_ctx = octx; octx->sendfile = r->sendfile; octx->pool = r->pool; octx->bufs.num = 1; octx->tag = (ngx_hunk_tag_t) &ngx_http_proxy_module; octx->output_filter = (ngx_output_chain_filter_pt) ngx_chain_writer; if (!(wctx = ngx_palloc(r->pool, sizeof(ngx_chain_writer_ctx_t)))) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } octx->output_ctx = wctx; wctx->pool = r->pool; ngx_http_proxy_connect(p); } static ngx_chain_t *ngx_http_proxy_create_request(ngx_http_proxy_ctx_t *p) { int i; size_t len; ngx_hunk_t *h; ngx_chain_t *chain; ngx_table_elt_t *header; ngx_http_request_t *r; ngx_http_proxy_upstream_t *u; r = p->request; u = p->lcf->upstream; len = http_methods[p->method - 1].len + u->uri.len + r->uri.len - u->location->len + 1 + r->args.len /* 1 is for "?" */ + sizeof(http_version) - 1 + sizeof(host_header) - 1 + u->host_header.len + 2 /* 2 is for "\r\n" */ + sizeof(connection_close_header) - 1 + 2; /* 2 is for "\r\n" at the header end */ header = (ngx_table_elt_t *) r->headers_in.headers->elts; for (i = 0; i < r->headers_in.headers->nelts; i++) { if (&header[i] == r->headers_in.host) { continue; } if (&header[i] == r->headers_in.connection) { continue; } /* 2 is for ": " and 2 is for "\r\n" */ len += header[i].key.len + 2 + header[i].value.len + 2; } /* STUB */ len++; ngx_test_null(h, ngx_create_temp_hunk(r->pool, len), NULL); ngx_alloc_link_and_set_hunk(chain, h, r->pool, NULL); /* the request line */ h->last = ngx_cpymem(h->last, http_methods[p->method - 1].data, http_methods[p->method - 1].len); h->last = ngx_cpymem(h->last, u->uri.data, u->uri.len); h->last = ngx_cpymem(h->last, r->uri.data + u->location->len, r->uri.len - u->location->len); if (r->args.len > 0) { *(h->last++) = '?'; h->last = ngx_cpymem(h->last, r->args.data, r->args.len); } h->last = ngx_cpymem(h->last, http_version, sizeof(http_version) - 1); /* "Host" header */ h->last = ngx_cpymem(h->last, host_header, sizeof(host_header) - 1); h->last = ngx_cpymem(h->last, u->host_header.data, u->host_header.len); *(h->last++) = CR; *(h->last++) = LF; /* "Connection: close" header */ h->last = ngx_cpymem(h->last, connection_close_header, sizeof(connection_close_header) - 1); for (i = 0; i < r->headers_in.headers->nelts; i++) { if (&header[i] == r->headers_in.host) { continue; } if (&header[i] == r->headers_in.connection) { continue; } if (&header[i] == r->headers_in.keep_alive) { continue; } h->last = ngx_cpymem(h->last, header[i].key.data, header[i].key.len); *(h->last++) = ':'; *(h->last++) = ' '; h->last = ngx_cpymem(h->last, header[i].value.data, header[i].value.len); *(h->last++) = CR; *(h->last++) = LF; ngx_log_debug(r->connection->log, "proxy: '%s: %s'" _ header[i].key.data _ header[i].value.data); } /* add "\r\n" at the header end */ *(h->last++) = CR; *(h->last++) = LF; /* STUB */ *(h->last) = '\0'; ngx_log_debug(r->connection->log, "PROXY:\n'%s'" _ h->pos); return chain; } static void ngx_http_proxy_send_request_handler(ngx_event_t *wev) { ngx_connection_t *c; ngx_http_proxy_ctx_t *p; c = wev->data; p = c->data; if (wev->timedout) { p->action = "sending request to upstream"; ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); return; } ngx_http_proxy_send_request(p); } static void ngx_http_proxy_dummy_handler(ngx_event_t *wev) { ngx_log_debug(wev->log, "dummy handler"); } static void ngx_http_proxy_connect(ngx_http_proxy_ctx_t *p) { int rc; ngx_chain_t *cl; ngx_connection_t *c; ngx_http_request_t *r; ngx_output_chain_ctx_t *octx; p->action = "connecting to upstream"; rc = ngx_event_connect_peer(&p->upstream); if (rc == NGX_ERROR) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } if (rc == NGX_CONNECT_ERROR) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); return; } p->upstream.connection->data = p; p->upstream.connection->write->event_handler = ngx_http_proxy_send_request_handler; p->upstream.connection->read->event_handler = ngx_http_proxy_process_upstream_status_line; r = p->request; c = p->upstream.connection; c->pool = r->pool; c->read->log = c->write->log = c->log = r->connection->log; octx = p->output_chain_ctx; if (p->upstream.tries > 1 && p->request_sent) { ngx_http_proxy_reinit_upstream(p); } /* init or reinit ngx_output_chain() context */ if (r->request_body_hunk) { if (!(octx->free = ngx_alloc_chain_link(r->pool))) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } octx->free->hunk = r->request_body_hunk; octx->free->next = NULL; octx->hunks = 1; r->request_body_hunk->pos = r->request_body_hunk->start; r->request_body_hunk->last = r->request_body_hunk->start; } p->request_sent = 0; if (rc == NGX_AGAIN) { ngx_add_timer(c->write, p->lcf->connect_timeout); return; } /* rc == NGX_OK */ #if 1 /* test only */ if (c->read->ready) { /* post aio operation */ ngx_http_proxy_process_upstream_status_line(c->read); return; } #endif ngx_http_proxy_send_request(p); } static void ngx_http_proxy_send_request(ngx_http_proxy_ctx_t *p) { int rc; ngx_connection_t *c; ngx_chain_writer_ctx_t *wctx; c = p->upstream.connection; #if (HAVE_KQUEUE) if ((ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) && !p->request_sent && c->write->kq_eof) { ngx_log_error(NGX_LOG_ERR, c->log, c->write->kq_errno, "connect() failed"); ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); return; } #endif p->action = "sending request to upstream"; wctx = p->output_chain_ctx->output_ctx; wctx->out = NULL; wctx->last = &wctx->out; wctx->connection = c; rc = ngx_output_chain(p->output_chain_ctx, p->request_sent ? NULL : p->request->request_hunks); if (rc == NGX_ERROR) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); return; } p->request_sent = 1; if (c->write->timer_set) { ngx_del_timer(c->write); } if (rc == NGX_AGAIN) { ngx_add_timer(c->write, p->lcf->send_timeout); if (ngx_handle_write_event(c->write, /* STUB: lowat */ 0) == NGX_ERROR) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } return; } /* rc == NGX_OK */ if (c->tcp_nopush) { if (ngx_tcp_push(c->fd) == NGX_ERROR) { ngx_log_error(NGX_LOG_CRIT, c->log, ngx_socket_errno, ngx_tcp_push_n " failed"); ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } c->tcp_nopush = 0; return; } #if 0 if (c->read->ready) { /* post aio operation */ /* * although we can post aio operation just in the end * of ngx_http_proxy_connect() CHECK IT !!! * it's better to do here because we postpone header buffer allocation */ ngx_http_proxy_process_upstream_status_line(c->read); return; } #endif p->upstream.connection->write->event_handler = ngx_http_proxy_dummy_handler; if (ngx_handle_level_write_event(c->write) == NGX_ERROR) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } static void ngx_http_proxy_process_upstream_status_line(ngx_event_t *rev) { int rc; ssize_t n; ngx_connection_t *c; ngx_http_proxy_ctx_t *p; c = rev->data; p = c->data; p->action = "reading upstream status line"; ngx_log_debug(rev->log, "http proxy process status line"); if (rev->timedout) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); return; } if (p->header_in == NULL) { p->header_in = ngx_create_temp_hunk(p->request->pool, p->lcf->header_buffer_size); if (p->header_in == NULL) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } p->header_in->tag = (ngx_hunk_tag_t) &ngx_http_proxy_module; if (p->cache) { p->header_in->pos += p->cache->ctx.header.size; p->header_in->last = p->header_in->pos; } } n = ngx_http_proxy_read_upstream_header(p); if (n == NGX_AGAIN) { return; } if (n == 0) { ngx_log_error(NGX_LOG_ERR, rev->log, 0, "upstream prematurely closed connection"); } if (n == NGX_ERROR || n == 0) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); return; } p->upstream.cached = 0; rc = ngx_http_proxy_parse_status_line(p); if (rc == NGX_AGAIN) { if (p->header_in->pos == p->header_in->last) { ngx_log_error(NGX_LOG_ERR, rev->log, 0, "upstream sent too long status line"); ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); } return; } if (rc == NGX_HTTP_PROXY_PARSE_NO_HEADER) { ngx_log_error(NGX_LOG_ERR, rev->log, 0, "upstream sent no valid HTTP/1.0 header"); if (p->accel) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); } else { p->request->http_version = NGX_HTTP_VERSION_9; p->status = NGX_HTTP_OK; ngx_http_proxy_send_response(p); } return; } /* rc == NGX_OK */ if (p->status == NGX_HTTP_INTERNAL_SERVER_ERROR) { if (p->upstream.tries > 1 && (p->lcf->next_upstream & NGX_HTTP_PROXY_FT_HTTP_500)) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_HTTP_500); return; } if (p->upstream.tries == 0 && p->stale && (p->lcf->use_stale & NGX_HTTP_PROXY_FT_HTTP_500)) { /* * TODO: use stale cached response if it exists and enabled */ return; } } p->status_line.len = p->status_end - p->status_start; p->status_line.data = ngx_palloc(p->request->pool, p->status_line.len + 1); if (p->status_line.data == NULL) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } ngx_cpystrn(p->status_line.data, p->status_start, p->status_line.len + 1); ngx_log_debug(rev->log, "http proxy status %d '%s'" _ p->status _ p->status_line.data); if (p->headers_in.headers) { p->headers_in.headers->nelts = 0; } else { p->headers_in.headers = ngx_create_table(p->request->pool, 20); } c->read->event_handler = ngx_http_proxy_process_upstream_headers; ngx_http_proxy_process_upstream_headers(rev); } static void ngx_http_proxy_process_upstream_headers(ngx_event_t *rev) { int i, rc; ssize_t n; ngx_table_elt_t *h; ngx_connection_t *c; ngx_http_request_t *r; ngx_http_proxy_ctx_t *p; c = rev->data; p = c->data; r = p->request; p->action = "reading upstream headers"; ngx_log_debug(rev->log, "http proxy process header line"); if (rev->timedout) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_TIMEOUT); return; } rc = NGX_AGAIN; for ( ;; ) { if (rc == NGX_AGAIN) { n = ngx_http_proxy_read_upstream_header(p); if (n == 0) { ngx_log_error(NGX_LOG_ERR, rev->log, 0, "upstream prematurely closed connection"); } if (n == NGX_ERROR || n == 0) { ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_ERROR); return; } if (n == NGX_AGAIN) { return; } } rc = ngx_http_parse_header_line(p->request, p->header_in); if (rc == NGX_OK) { /* a header line has been parsed successfully */ h = ngx_http_add_header(&p->headers_in, ngx_http_proxy_headers_in); if (h == NULL) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } h->key.len = r->header_name_end - r->header_name_start; h->value.len = r->header_end - r->header_start; h->key.data = ngx_palloc(p->request->pool, h->key.len + 1 + h->value.len + 1); if (h->key.data == NULL) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } h->value.data = h->key.data + h->key.len + 1; ngx_cpystrn(h->key.data, r->header_name_start, h->key.len + 1); ngx_cpystrn(h->value.data, r->header_start, h->value.len + 1); for (i = 0; ngx_http_proxy_headers_in[i].name.len != 0; i++) { if (ngx_http_proxy_headers_in[i].name.len != h->key.len) { continue; } if (ngx_strcasecmp(ngx_http_proxy_headers_in[i].name.data, h->key.data) == 0) { *((ngx_table_elt_t **) ((char *) &p->headers_in + ngx_http_proxy_headers_in[i].offset)) = h; break; } } ngx_log_debug(c->log, "HTTP proxy header: '%s: %s'" _ h->key.data _ h->value.data); continue; } else if (rc == NGX_HTTP_PARSE_HEADER_DONE) { /* a whole header has been parsed successfully */ ngx_log_debug(c->log, "HTTP header done"); ngx_http_proxy_send_response(p); return; } else if (rc != NGX_AGAIN) { /* there was error while a header line parsing */ ngx_log_error(NGX_LOG_ERR, rev->log, 0, upstream_header_errors[rc - NGX_HTTP_PARSE_HEADER_ERROR]); ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); return; } /* rc == NGX_AGAIN: a header line parsing is still not complete */ if (p->header_in->last == p->header_in->end) { ngx_log_error(NGX_LOG_ERR, rev->log, 0, "upstream sent too big header"); ngx_http_proxy_next_upstream(p, NGX_HTTP_PROXY_FT_INVALID_HEADER); return; } } } static ssize_t ngx_http_proxy_read_upstream_header(ngx_http_proxy_ctx_t *p) { ssize_t n; ngx_event_t *rev; rev = p->upstream.connection->read; n = p->header_in->last - p->header_in->pos; if (n > 0) { return n; } n = ngx_recv(p->upstream.connection, p->header_in->last, p->header_in->end - p->header_in->last); if (n == NGX_AGAIN) { ngx_add_timer(rev, p->lcf->read_timeout); if (ngx_handle_read_event(rev, 0) == NGX_ERROR) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_ERROR; } return NGX_AGAIN; } if (n == 0) { ngx_log_error(NGX_LOG_ERR, rev->log, 0, "upstream closed prematurely connection"); } if (n == 0 || n == NGX_ERROR) { return NGX_ERROR; } p->header_in->last += n; return n; } static void ngx_http_proxy_send_response(ngx_http_proxy_ctx_t *p) { int rc, i; ngx_table_elt_t *ho, *h; ngx_event_pipe_t *ep; ngx_http_request_t *r; ngx_http_bin_cache_t *header; ngx_http_core_loc_conf_t *clcf; r = p->request; r->headers_out.status = p->status; #if 0 r->headers_out.content_length_n = -1; r->headers_out.content_length = NULL; #endif /* copy an upstream header to r->headers_out */ if (ngx_http_proxy_copy_header(p, &p->headers_in) == NGX_ERROR) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } /* TODO: preallocate event_pipe hunks, look "Content-Length" */ rc = ngx_http_send_header(r); p->header_sent = 1; if (p->cache) { header = (ngx_http_bin_cache_t *) p->header_in->start; header->type = 0x42424242; /* "BBBB" */ header->header.length = r->headers_out.content_length_n; header->key_len = p->cache->ctx.key.len; ngx_memcpy(&header->key, p->cache->ctx.key.data, header->key_len); header->key[header->key_len] = LF; } ep = ngx_pcalloc(r->pool, sizeof(ngx_event_pipe_t)); if (ep == NULL) { ngx_http_proxy_finalize_request(p, 0); return; } ep->input_filter = ngx_event_pipe_copy_input_filter; ep->output_filter = (ngx_event_pipe_output_filter_pt) ngx_http_output_filter; ep->output_ctx = r; ep->tag = (ngx_hunk_tag_t) &ngx_http_proxy_module; ep->bufs = p->lcf->bufs; ep->busy_size = p->lcf->busy_buffers_size; ep->upstream = p->upstream.connection; ep->downstream = r->connection; ep->pool = r->pool; ep->log = r->connection->log; if (!(ep->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)))) { ngx_http_proxy_finalize_request(p, 0); return; } ep->temp_file->file.fd = NGX_INVALID_FILE; ep->temp_file->file.log = r->connection->log; ep->temp_file->path = p->lcf->temp_path; ep->temp_file->pool = r->pool; ep->temp_file->warn = "an upstream response is buffered " "to a temporary file"; ep->max_temp_file_size = p->lcf->max_temp_file_size; ep->temp_file_write_size = p->lcf->temp_file_write_size; ep->preread_hunks = ngx_alloc_chain_link(r->pool); if (ep->preread_hunks == NULL) { ngx_http_proxy_finalize_request(p, 0); return; } ep->preread_hunks->hunk = p->header_in; ep->preread_hunks->next = NULL; p->header_in->type |= NGX_HUNK_PREREAD; ep->preread_size = p->header_in->last - p->header_in->pos; if (ngx_event_flags & NGX_USE_AIO_EVENT) { /* the posted aio operation can currupt shadow buf */ ep->single_buf = 1; } /* TODO: ep->free_bufs = 0 if use ngx_create_chain_of_hunks() */ ep->free_bufs = 1; /* * event_pipe would do p->header_in->last += ep->preread_size * as though these bytes were read. */ p->header_in->last = p->header_in->pos; ep->cachable = p->cachable; if (p->lcf->cyclic_temp_file) { /* * we need to disable the use of sendfile() if we use cyclic temp file * because the writing a new data can interfere with sendfile() * that uses the same kernel file pages (at least on FreeBSD) */ ep->cyclic_temp_file = 1; r->sendfile = 0; } else { ep->cyclic_temp_file = 0; r->sendfile = 1; } clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); ep->read_timeout = p->lcf->read_timeout; ep->send_timeout = clcf->send_timeout; ep->send_lowat = clcf->send_lowat; p->event_pipe = ep; p->upstream.connection->read->event_handler = ngx_http_proxy_process_body; r->connection->write->event_handler = ngx_http_proxy_process_body; ngx_http_proxy_process_body(p->upstream.connection->read); return; } static void ngx_http_proxy_process_body(ngx_event_t *ev) { ngx_connection_t *c; ngx_http_request_t *r; ngx_http_proxy_ctx_t *p; ngx_event_pipe_t *ep; c = ev->data; if (ev->write) { ngx_log_debug(ev->log, "http proxy process downstream"); r = c->data; p = ngx_http_get_module_ctx(r, ngx_http_proxy_module); p->action = "sending to client"; } else { ngx_log_debug(ev->log, "http proxy process upstream"); p = c->data; r = p->request; p->action = "reading upstream body"; } ep = p->event_pipe; if (ev->timedout) { if (ev->write) { ep->downstream_error = 1; ngx_log_error(NGX_LOG_ERR, c->log, NGX_ETIMEDOUT, "client timed out"); } else { ep->upstream_error = 1; ngx_log_error(NGX_LOG_ERR, c->log, NGX_ETIMEDOUT, "upstream timed out"); } } else { if (ngx_event_pipe(ep, ev->write) == NGX_ABORT) { ngx_http_proxy_finalize_request(p, 0); return; } } if (p->upstream.connection) { if (ep->upstream_done) { if (ngx_http_proxy_update_cache(p) == NGX_ERROR) { ngx_http_proxy_finalize_request(p, 0); return; } } else if (ep->upstream_eof) { /* TODO: check length & update cache */ if (ngx_http_proxy_update_cache(p) == NGX_ERROR) { ngx_http_proxy_finalize_request(p, 0); return; } } if (ep->upstream_done || ep->upstream_eof || ep->upstream_error) { ngx_http_proxy_close_connection(p->upstream.connection); p->upstream.connection = NULL; } } if (ep->downstream_done) { ngx_log_debug(ev->log, "http proxy downstream done"); ngx_http_proxy_finalize_request(p, r->main ? 0 : ngx_http_send_last(r)); return; } if (ep->downstream_error) { if (!p->cachable && p->upstream.connection) { ngx_http_proxy_close_connection(p->upstream.connection); p->upstream.connection = NULL; } if (p->upstream.connection == NULL) { ngx_http_close_connection(c); } } return; } static int ngx_http_proxy_update_cache(ngx_http_proxy_ctx_t *p) { if (p->cache == NULL) { return NGX_OK; } return ngx_http_cache_update_file(p->request, &p->cache->ctx, &p->event_pipe->temp_file->file.name); } static void ngx_http_proxy_next_upstream(ngx_http_proxy_ctx_t *p, int ft_type) { int status; ngx_log_debug(p->request->connection->log, "next upstream: %d" _ ft_type); if (ft_type != NGX_HTTP_PROXY_FT_HTTP_404) { ngx_event_connect_peer_failed(&p->upstream); } if (ft_type == NGX_HTTP_PROXY_FT_TIMEOUT) { ngx_log_error(NGX_LOG_ERR, p->request->connection->log, NGX_ETIMEDOUT, "upstream timed out"); } if (p->upstream.cached && ft_type == NGX_HTTP_PROXY_FT_ERROR) { status = 0; } else { switch(ft_type) { case NGX_HTTP_PROXY_FT_TIMEOUT: status = NGX_HTTP_GATEWAY_TIME_OUT; break; case NGX_HTTP_PROXY_FT_HTTP_500: status = NGX_HTTP_INTERNAL_SERVER_ERROR; break; case NGX_HTTP_PROXY_FT_HTTP_404: status = NGX_HTTP_NOT_FOUND; break; /* * NGX_HTTP_PROXY_FT_BUSY_LOCK and NGX_HTTP_PROXY_FT_MAX_WAITING * never reach here */ default: status = NGX_HTTP_BAD_GATEWAY; } } if (p->upstream.connection) { ngx_http_proxy_close_connection(p->upstream.connection); p->upstream.connection = NULL; } if (status) { if (ngx_http_proxy_log_state(p, status) == NGX_ERROR) { ngx_http_proxy_finalize_request(p, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } if (p->upstream.tries == 0 || !(p->lcf->next_upstream & ft_type)) { if (p->stale && (p->lcf->use_stale & ft_type)) { /* * TODO: use stale cached response if it exists and enabled */ } ngx_http_proxy_finalize_request(p, status); return; } } ngx_http_proxy_connect(p); } static int ngx_http_proxy_log_state(ngx_http_proxy_ctx_t *p, int status) { ngx_http_proxy_state_t *state; if (!(state = ngx_push_array(&p->states))) { return NGX_ERROR; } state->status = status; state->peer = &p->upstream.peers->peers[p->upstream.cur_peer].addr_port_text; return NGX_OK; } static void ngx_http_proxy_finalize_request(ngx_http_proxy_ctx_t *p, int rc) { ngx_log_debug(p->request->connection->log, "finalize http proxy request"); if (p->upstream.connection) { ngx_http_proxy_close_connection(p->upstream.connection); p->upstream.connection = NULL; } if (p->header_sent && (rc == NGX_ERROR || rc >= NGX_HTTP_SPECIAL_RESPONSE)) { rc = 0; } p->request->connection->log->data = p->saved_ctx; p->request->connection->log->handler = p->saved_handler; ngx_http_finalize_request(p->request, rc); } static void ngx_http_proxy_close_connection(ngx_connection_t *c) { ngx_log_debug(c->log, "proxy close connection: %d" _ c->fd); if (c->fd == -1) { #if 0 ngx_log_error(NGX_LOG_ALERT, c->log, 0, "connection already closed"); #endif return; } if (c->read->timer_set) { ngx_del_timer(c->read); } if (c->write->timer_set) { ngx_del_timer(c->write); } /* TODO: move connection to the connection pool */ if (ngx_del_conn) { ngx_del_conn(c); } else { if (c->read->active) { ngx_del_event(c->read, NGX_READ_EVENT, NGX_CLOSE_EVENT); } if (c->write->active) { ngx_del_event(c->write, NGX_WRITE_EVENT, NGX_CLOSE_EVENT); } } if (ngx_close_socket(c->fd) == -1) { ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno, ngx_close_socket_n " failed"); } c->fd = -1; } static size_t ngx_http_proxy_log_error(void *data, char *buf, size_t len) { ngx_http_proxy_ctx_t *p = data; return ngx_snprintf(buf, len, " while %s, client: %s, URL: %s, upstream: %s%s%s%s%s", p->action, p->request->connection->addr_text.data, p->request->unparsed_uri.data, p->upstream.peers->peers[p->upstream.cur_peer].addr_port_text.data, p->lcf->upstream->uri.data, p->request->uri.data + p->lcf->upstream->location->len, p->request->args.len ? "?" : "", p->request->args.len ? p->request->args.data : ""); } static void *ngx_http_proxy_create_loc_conf(ngx_conf_t *cf) { ngx_http_proxy_loc_conf_t *conf; ngx_test_null(conf, ngx_pcalloc(cf->pool, sizeof(ngx_http_proxy_loc_conf_t)), NGX_CONF_ERROR); /* set by ngx_pcalloc(): conf->bufs.num = 0; conf->path = NULL; conf->next_upstream = 0; conf->use_stale = 0; conf->upstreams = NULL; conf->peers = NULL; conf->cache_path = NULL; conf->temp_path = NULL; */ conf->request_buffer_size = NGX_CONF_UNSET; conf->connect_timeout = NGX_CONF_UNSET; conf->send_timeout = NGX_CONF_UNSET; conf->header_buffer_size = NGX_CONF_UNSET; conf->read_timeout = NGX_CONF_UNSET; conf->busy_buffers_size = NGX_CONF_UNSET; /* * "proxy_max_temp_file_size" is hardcoded to 1G for reverse proxy, * it should be configurable in the generic proxy */ conf->max_temp_file_size = 1024 * 1024 * 1024; conf->temp_file_write_size = NGX_CONF_UNSET; /* "proxy_cyclic_temp_file" is disabled */ conf->cyclic_temp_file = 0; conf->cache = NGX_CONF_UNSET; conf->pass_server = NGX_CONF_UNSET; return conf; } static char *ngx_http_proxy_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_proxy_loc_conf_t *prev = parent; ngx_http_proxy_loc_conf_t *conf = child; ngx_conf_merge_size_value(conf->request_buffer_size, prev->request_buffer_size, 8192); ngx_conf_merge_msec_value(conf->connect_timeout, prev->connect_timeout, 60000); ngx_conf_merge_msec_value(conf->send_timeout, prev->send_timeout, 30000); ngx_conf_merge_size_value(conf->header_buffer_size, prev->header_buffer_size, 4096); ngx_conf_merge_msec_value(conf->read_timeout, prev->read_timeout, 30000); ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 8, 4096); ngx_conf_merge_size_value(conf->busy_buffers_size, prev->busy_buffers_size, 8192); #if 0 if (conf->max_temp_file_size > conf->bufs.size) { return "\"proxy_max_temp_file\" must be greater " "than one of the \"proxy_buffers\""; } #endif ngx_conf_merge_size_value(conf->temp_file_write_size, prev->temp_file_write_size, 16384); ngx_conf_merge_bitmask_value(conf->next_upstream, prev->next_upstream, (NGX_CONF_BITMASK_SET |NGX_HTTP_PROXY_FT_ERROR |NGX_HTTP_PROXY_FT_TIMEOUT)); ngx_conf_merge_bitmask_value(conf->use_stale, prev->use_stale, NGX_CONF_BITMASK_SET); ngx_conf_merge_path_value(conf->cache_path, prev->cache_path, "cache", 1, 2, 0, cf->pool); ngx_conf_merge_path_value(conf->temp_path, prev->temp_path, "temp", 1, 2, 0, cf->pool); ngx_conf_merge_value(conf->cache, prev->cache, 0); ngx_conf_merge_value(conf->pass_server, prev->pass_server, 0); return NULL; } static char *ngx_http_proxy_set_pass(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_proxy_loc_conf_t *lcf = conf; int i, len; char *err, *host; ngx_str_t *value; struct hostent *h; u_int32_t addr; ngx_http_conf_ctx_t *ctx; ngx_http_core_loc_conf_t *clcf; value = cf->args->elts; if (ngx_strncasecmp(value[1].data, "http://", 7) != 0) { return "invalid URL prefix"; } ngx_test_null(lcf->upstream, ngx_pcalloc(cf->pool, sizeof(ngx_http_proxy_upstream_t)), NGX_CONF_ERROR); lcf->upstream->url.len = value[1].len; if (!(lcf->upstream->url.data = ngx_palloc(cf->pool, value[1].len + 1))) { return NGX_CONF_ERROR; } ngx_cpystrn(lcf->upstream->url.data, value[1].data, value[1].len + 1); value[1].data += 7; value[1].len -= 7; err = ngx_http_proxy_parse_upstream(&value[1], lcf->upstream); if (err) { return err; } ngx_test_null(host, ngx_palloc(cf->pool, lcf->upstream->host.len + 1), NGX_CONF_ERROR); ngx_cpystrn(host, lcf->upstream->host.data, lcf->upstream->host.len + 1); addr = inet_addr(host); if (addr == INADDR_NONE) { h = gethostbyname(host); if (h == NULL || h->h_addr_list[0] == NULL) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "host %s not found", host); return NGX_CONF_ERROR; } for (i = 0; h->h_addr_list[i] != NULL; i++) { /* void */ } /* MP: ngx_shared_palloc() */ ngx_test_null(lcf->peers, ngx_pcalloc(cf->pool, sizeof(ngx_peers_t) + sizeof(ngx_peer_t) * (i - 1)), NGX_CONF_ERROR); lcf->peers->number = i; for (i = 0; h->h_addr_list[i] != NULL; i++) { lcf->peers->peers[i].host.data = host; lcf->peers->peers[i].host.len = lcf->upstream->host.len; lcf->peers->peers[i].addr = *(u_int32_t *)(h->h_addr_list[i]); lcf->peers->peers[i].port = lcf->upstream->port; len = INET_ADDRSTRLEN + lcf->upstream->port_text.len + 1; ngx_test_null(lcf->peers->peers[i].addr_port_text.data, ngx_palloc(cf->pool, len), NGX_CONF_ERROR); len = ngx_inet_ntop(AF_INET, (char *) &lcf->peers->peers[i].addr, lcf->peers->peers[i].addr_port_text.data, len); lcf->peers->peers[i].addr_port_text.data[len++] = ':'; ngx_cpystrn(lcf->peers->peers[i].addr_port_text.data + len, lcf->upstream->port_text.data, lcf->upstream->port_text.len + 1); lcf->peers->peers[i].addr_port_text.len = len + lcf->upstream->port_text.len + 1; } } else { /* MP: ngx_shared_palloc() */ ngx_test_null(lcf->peers, ngx_pcalloc(cf->pool, sizeof(ngx_peers_t)), NGX_CONF_ERROR); lcf->peers->number = 1; lcf->peers->peers[0].host.data = host; lcf->peers->peers[0].host.len = lcf->upstream->host.len; lcf->peers->peers[0].addr = addr; lcf->peers->peers[0].port = lcf->upstream->port; len = lcf->upstream->host.len + lcf->upstream->port_text.len + 1; ngx_test_null(lcf->peers->peers[0].addr_port_text.data, ngx_palloc(cf->pool, len + 1), NGX_CONF_ERROR); len = lcf->upstream->host.len; ngx_memcpy(lcf->peers->peers[0].addr_port_text.data, lcf->upstream->host.data, len); lcf->peers->peers[0].addr_port_text.data[len++] = ':'; ngx_cpystrn(lcf->peers->peers[0].addr_port_text.data + len, lcf->upstream->port_text.data, lcf->upstream->port_text.len + 1); } ctx = cf->ctx; clcf = ctx->loc_conf[ngx_http_core_module.ctx_index]; lcf->upstream->location = &clcf->name; clcf->handler = ngx_http_proxy_handler; return NULL; } static char *ngx_http_proxy_parse_upstream(ngx_str_t *url, ngx_http_proxy_upstream_t *u) { size_t i; if (url->data[0] == ':' || url->data[0] == '/') { return "invalid upstream URL"; } u->host.data = url->data; u->host_header.data = url->data; for (i = 1; i < url->len; i++) { if (url->data[i] == ':') { u->port_text.data = &url->data[i] + 1; u->host.len = i; } if (url->data[i] == '/') { u->uri.data = &url->data[i]; u->uri.len = url->len - i; u->host_header.len = i; if (u->host.len == 0) { u->host.len = i; } if (u->port_text.data == NULL) { u->port = htons(80); u->port_text.len = 2; u->port_text.data = "80"; return NULL; } u->port_text.len = &url->data[i] - u->port_text.data; if (u->port_text.len > 0) { u->port = ngx_atoi(u->port_text.data, u->port_text.len); if (u->port > 0) { u->port = htons((u_short) u->port); return NULL; } } return "invalid port in upstream URL"; } } if (u->host.len == 0) { u->host.len = i; } u->host_header.len = i; u->uri.data = "/"; u->uri.len = 1; if (u->port_text.data == NULL) { u->port = htons(80); u->port_text.len = 2; u->port_text.data = "80"; return NULL; } u->port_text.len = &url->data[i] - u->port_text.data; if (u->port_text.len > 0) { u->port = ngx_atoi(u->port_text.data, u->port_text.len); if (u->port > 0) { u->port = htons((u_short) u->port); return NULL; } } return "invalid port in upstream URL"; }