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