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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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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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10
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11
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12
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13 static ngx_int_t ngx_http_not_modified_filter_init(ngx_cycle_t *cycle);
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14
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15
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16 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = {
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17 NULL, /* pre conf */
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18
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19 NULL, /* create main configuration */
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20 NULL, /* init main configuration */
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21
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22 NULL, /* create server configuration */
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23 NULL, /* merge server configuration */
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24
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25 NULL, /* create location configuration */
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26 NULL /* merge location configuration */
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27 };
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28
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29
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30 ngx_module_t ngx_http_not_modified_filter_module = {
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31 NGX_MODULE,
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32 &ngx_http_not_modified_filter_module_ctx, /* module context */
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33 NULL, /* module directives */
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34 NGX_HTTP_MODULE, /* module type */
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35 ngx_http_not_modified_filter_init, /* init module */
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36 NULL /* init child */
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37 };
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38
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39
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40 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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41
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42
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43 static ngx_int_t ngx_http_not_modified_header_filter(ngx_http_request_t *r)
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44 {
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45 time_t ims;
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46
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47 if (r->headers_out.status != NGX_HTTP_OK
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48 || r->headers_in.if_modified_since == NULL
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49 || r->headers_out.last_modified_time == -1)
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50 {
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51 return ngx_http_next_header_filter(r);
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52 }
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53
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54 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
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55 r->headers_in.if_modified_since->value.len);
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56
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57 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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58 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time);
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59
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60 /*
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61 * I think that the equality of the dates is correcter
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62 */
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63
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64 if (ims != NGX_ERROR && ims == r->headers_out.last_modified_time) {
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65 r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
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66 r->headers_out.content_type->key.len = 0;
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67 r->headers_out.content_type = NULL;
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68 r->headers_out.content_length_n = -1;
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69 r->headers_out.content_length = NULL;
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70 #if 0
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71 r->headers_out.accept_ranges->key.len = 0;
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72 #endif
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73 }
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74
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75 return ngx_http_next_header_filter(r);
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76 }
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77
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78
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79 static ngx_int_t ngx_http_not_modified_filter_init(ngx_cycle_t *cycle)
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80 {
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81 ngx_http_next_header_filter = ngx_http_top_header_filter;
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82 ngx_http_top_header_filter = ngx_http_not_modified_header_filter;
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83
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84 return NGX_OK;
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85 }
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