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comparison src/http/modules/ngx_http_not_modified_filter.c @ 135:e29909bd9b8a

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nginx-0.0.1-2003-09-28-23:29:06 import
author Igor Sysoev <igor@sysoev.ru>
date Sun, 28 Sep 2003 19:29:06 +0000
parents
children da00cde00e8a
comparison
equal deleted inserted replaced
134:d57c6835225c 135:e29909bd9b8a
1
2 #include <ngx_config.h>
3 #include <ngx_core.h>
4 #include <ngx_http.h>
5
6
7
8 static int ngx_http_not_modified_filter_init(ngx_cycle_t *cycle);
9
10
11 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = {
12 NULL, /* create main configuration */
13 NULL, /* init main configuration */
14
15 NULL, /* create server configuration */
16 NULL, /* merge server configuration */
17
18 NULL, /* create location configuration */
19 NULL /* merge location configuration */
20 };
21
22
23 ngx_module_t ngx_http_not_modified_filter_module = {
24 NGX_MODULE,
25 &ngx_http_not_modified_filter_module_ctx, /* module context */
26 NULL, /* module directives */
27 NGX_HTTP_MODULE, /* module type */
28 ngx_http_not_modified_filter_init, /* init module */
29 NULL /* init child */
30 };
31
32
33 static int (*next_header_filter) (ngx_http_request_t *r);
34
35
36 static int ngx_http_not_modified_header_filter(ngx_http_request_t *r)
37 {
38 time_t ims;
39
40 if (r->headers_out.status != NGX_HTTP_OK
41 || r->headers_in.if_modified_since == NULL
42 || r->headers_out.last_modified_time == NULL)
43 {
44 return next_header_filter(r);
45 }
46
47 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
48 r->headers_in.if_modified_since->value.len);
49
50 ngx_log_debug(r->connection->log, "%d %d" _
51 ims _ r->headers_out.last_modified_time);
52
53 /* I think that the date equality is correcter */
54
55 if (ims != NGX_ERROR && ims == r->headers_out.last_modified_time) {
56 r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
57 r->headers_out.content_length = -1;
58 r->headers_out.content_type->key.len = 0;
59 r->headers_out.content_type = NULL;
60
61 /* TODO: delete "Accept-Ranges" header
62 }
63
64 return next_header_filter(r);
65 }
66
67
68 static int ngx_http_not_modified_filter_init(ngx_cycle_t *cycle)
69 {
70 next_header_filter = ngx_http_top_header_filter;
71 ngx_http_top_header_filter = ngx_http_not_modified_header_filter;
72
73 return NGX_OK;
74 }