0
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9 #include <ngx_http.h>
|
|
10
|
|
11
|
|
12
|
230
|
13 static ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf);
|
0
|
14
|
|
15
|
|
16 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = {
|
58
|
17 NULL, /* preconfiguration */
|
230
|
18 ngx_http_not_modified_filter_init, /* postconfiguration */
|
0
|
19
|
|
20 NULL, /* create main configuration */
|
|
21 NULL, /* init main configuration */
|
|
22
|
|
23 NULL, /* create server configuration */
|
|
24 NULL, /* merge server configuration */
|
|
25
|
|
26 NULL, /* create location configuration */
|
|
27 NULL /* merge location configuration */
|
|
28 };
|
|
29
|
|
30
|
|
31 ngx_module_t ngx_http_not_modified_filter_module = {
|
58
|
32 NGX_MODULE_V1,
|
0
|
33 &ngx_http_not_modified_filter_module_ctx, /* module context */
|
|
34 NULL, /* module directives */
|
|
35 NGX_HTTP_MODULE, /* module type */
|
90
|
36 NULL, /* init master */
|
230
|
37 NULL, /* init module */
|
90
|
38 NULL, /* init process */
|
|
39 NULL, /* init thread */
|
|
40 NULL, /* exit thread */
|
|
41 NULL, /* exit process */
|
|
42 NULL, /* exit master */
|
|
43 NGX_MODULE_V1_PADDING
|
0
|
44 };
|
|
45
|
|
46
|
|
47 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
|
|
48
|
|
49
|
230
|
50 static
|
|
51 ngx_int_t ngx_http_not_modified_header_filter(ngx_http_request_t *r)
|
0
|
52 {
|
453
|
53 time_t ims;
|
|
54 ngx_http_core_loc_conf_t *clcf;
|
0
|
55
|
|
56 if (r->headers_out.status != NGX_HTTP_OK
|
146
|
57 || r != r->main
|
0
|
58 || r->headers_in.if_modified_since == NULL
|
|
59 || r->headers_out.last_modified_time == -1)
|
|
60 {
|
|
61 return ngx_http_next_header_filter(r);
|
|
62 }
|
|
63
|
|
64 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
|
|
65 r->headers_in.if_modified_since->value.len);
|
126
|
66
|
0
|
67 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
68 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time);
|
|
69
|
453
|
70 if (ims != r->headers_out.last_modified_time) {
|
|
71
|
|
72 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
|
0
|
73
|
453
|
74 if (clcf->if_modified_since == 0
|
|
75 || ims < r->headers_out.last_modified_time)
|
|
76 {
|
|
77 return ngx_http_next_header_filter(r);
|
|
78 }
|
0
|
79 }
|
|
80
|
453
|
81 r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
|
|
82 r->headers_out.content_type.len = 0;
|
|
83 ngx_http_clear_content_length(r);
|
|
84 ngx_http_clear_accept_ranges(r);
|
|
85
|
0
|
86 return ngx_http_next_header_filter(r);
|
|
87 }
|
|
88
|
|
89
|
230
|
90 static
|
|
91 ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf)
|
0
|
92 {
|
|
93 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
94 ngx_http_top_header_filter = ngx_http_not_modified_header_filter;
|
|
95
|
|
96 return NGX_OK;
|
|
97 }
|