annotate src/http/modules/ngx_http_not_modified_filter_module.c @ 58:b55cbf18157e NGINX_0_1_29

nginx 0.1.29 *) Feature: the ngx_http_ssi_module supports "include virtual" command. *) Feature: the ngx_http_ssi_module supports the condition command like 'if expr="$NAME"' and "else" and "endif" commands. Only one nested level is supported. *) Feature: the ngx_http_ssi_module supports the DATE_LOCAL and DATE_GMT variables and "config timefmt" command. *) Feature: the "ssi_ignore_recycled_buffers" directive. *) Bugfix: the "echo" command did not show the default value for the empty QUERY_STRING variable. *) Change: the ngx_http_proxy_module was rewritten. *) Feature: the "proxy_redirect", "proxy_pass_request_headers", "proxy_pass_request_body", and "proxy_method" directives. *) Feature: the "proxy_set_header" directive. The "proxy_x_var" was canceled and must be replaced with the proxy_set_header directive. *) Change: the "proxy_preserve_host" is canceled and must be replaced with the "proxy_set_header Host $host" and the "proxy_redirect off" directives, the "proxy_set_header Host $host:$proxy_port" directive and the appropriate proxy_redirect directives. *) Change: the "proxy_set_x_real_ip" is canceled and must be replaced with the "proxy_set_header X-Real-IP $remote_addr" directive. *) Change: the "proxy_add_x_forwarded_for" is canceled and must be replaced with the "proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for" directive. *) Change: the "proxy_set_x_url" is canceled and must be replaced with the "proxy_set_header X-URL http://$host:$server_port$request_uri" directive. *) Feature: the "fastcgi_param" directive. *) Change: the "fastcgi_root", "fastcgi_set_var" and "fastcgi_params" directive are canceled and must be replaced with the fastcgi_param directives. *) Feature: the "index" directive can use the variables. *) Feature: the "index" directive can be used at http and server levels. *) Change: the last index only in the "index" directive can be absolute. *) Feature: the "rewrite" directive can use the variables. *) Feature: the "internal" directive. *) Feature: the CONTENT_LENGTH, CONTENT_TYPE, REMOTE_PORT, SERVER_ADDR, SERVER_PORT, SERVER_PROTOCOL, DOCUMENT_ROOT, SERVER_NAME, REQUEST_METHOD, REQUEST_URI, and REMOTE_USER variables. *) Change: nginx now passes the invalid lines in a client request headers or a backend response header. *) Bugfix: if the backend did not transfer response for a long time and the "send_timeout" was less than "proxy_read_timeout", then nginx returned the 408 response. *) Bugfix: the segmentation fault was occurred if the backend sent an invalid line in response header; bug appeared in 0.1.26. *) Bugfix: the segmentation fault may occurred in FastCGI fault tolerance configuration. *) Bugfix: the "expires" directive did not remove the previous "Expires" and "Cache-Control" headers. *) Bugfix: nginx did not take into account trailing dot in "Host" header line. *) Bugfix: the ngx_http_auth_module did not work under Linux. *) Bugfix: the rewrite directive worked incorrectly, if the arguments were in a request. *) Bugfix: nginx could not be built on MacOS X.
author Igor Sysoev <http://sysoev.ru>
date Thu, 12 May 2005 00:00:00 +0400
parents 72eb30262aac
children 71c46860eb55
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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13 static ngx_int_t ngx_http_not_modified_filter_init(ngx_cycle_t *cycle);
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16 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = {
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17 NULL, /* preconfiguration */
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18 NULL, /* postconfiguration */
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20 NULL, /* create main configuration */
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21 NULL, /* init main configuration */
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23 NULL, /* create server configuration */
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24 NULL, /* merge server configuration */
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26 NULL, /* create location configuration */
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27 NULL /* merge location configuration */
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28 };
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31 ngx_module_t ngx_http_not_modified_filter_module = {
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32 NGX_MODULE_V1,
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33 &ngx_http_not_modified_filter_module_ctx, /* module context */
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34 NULL, /* module directives */
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35 NGX_HTTP_MODULE, /* module type */
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36 ngx_http_not_modified_filter_init, /* init module */
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37 NULL /* init process */
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38 };
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41 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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44 static ngx_int_t ngx_http_not_modified_header_filter(ngx_http_request_t *r)
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45 {
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46 time_t ims;
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48 if (r->headers_out.status != NGX_HTTP_OK
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49 || r->main
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50 || r->headers_in.if_modified_since == NULL
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51 || r->headers_out.last_modified_time == -1)
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52 {
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53 return ngx_http_next_header_filter(r);
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54 }
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56 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
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57 r->headers_in.if_modified_since->value.len);
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59 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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60 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time);
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62 /*
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63 * I think that the equality of the dates is correcter
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64 */
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66 if (ims != NGX_ERROR && ims == r->headers_out.last_modified_time) {
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67 r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
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68 r->headers_out.content_type.len = 0;
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69 r->headers_out.content_length_n = -1;
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70 r->headers_out.content_length = NULL;
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71 #if 0
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72 r->headers_out.accept_ranges->hash = 0;
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73 #endif
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74 }
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76 return ngx_http_next_header_filter(r);
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77 }
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80 static ngx_int_t ngx_http_not_modified_filter_init(ngx_cycle_t *cycle)
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81 {
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82 ngx_http_next_header_filter = ngx_http_top_header_filter;
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83 ngx_http_top_header_filter = ngx_http_not_modified_header_filter;
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84
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85 return NGX_OK;
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86 }