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0
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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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58
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17 NULL, /* preconfiguration */
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18 NULL, /* postconfiguration */
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0
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19
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20 NULL, /* create main configuration */
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21 NULL, /* init main configuration */
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22
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23 NULL, /* create server configuration */
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24 NULL, /* merge server configuration */
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25
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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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29
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30
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31 ngx_module_t ngx_http_not_modified_filter_module = {
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58
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32 NGX_MODULE_V1,
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0
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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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90
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36 NULL, /* init master */
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0
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37 ngx_http_not_modified_filter_init, /* init module */
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90
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38 NULL, /* init process */
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39 NULL, /* init thread */
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40 NULL, /* exit thread */
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41 NULL, /* exit process */
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42 NULL, /* exit master */
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43 NGX_MODULE_V1_PADDING
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0
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44 };
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45
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46
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47 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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48
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49
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50 static ngx_int_t ngx_http_not_modified_header_filter(ngx_http_request_t *r)
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51 {
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52 time_t ims;
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53
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54 if (r->headers_out.status != NGX_HTTP_OK
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102
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55 || r->main != r
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0
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56 || r->headers_in.if_modified_since == NULL
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57 || r->headers_out.last_modified_time == -1)
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58 {
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59 return ngx_http_next_header_filter(r);
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60 }
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61
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62 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
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63 r->headers_in.if_modified_since->value.len);
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126
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64
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0
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65 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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66 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time);
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67
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68 /*
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69 * I think that the equality of the dates is correcter
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70 */
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71
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72 if (ims != NGX_ERROR && ims == r->headers_out.last_modified_time) {
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73 r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
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58
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74 r->headers_out.content_type.len = 0;
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126
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75 ngx_http_clear_content_length(r);
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76 ngx_http_clear_accept_ranges(r);
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0
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77 }
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78
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79 return ngx_http_next_header_filter(r);
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80 }
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81
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82
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83 static ngx_int_t ngx_http_not_modified_filter_init(ngx_cycle_t *cycle)
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84 {
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85 ngx_http_next_header_filter = ngx_http_top_header_filter;
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86 ngx_http_top_header_filter = ngx_http_not_modified_header_filter;
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87
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88 return NGX_OK;
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89 }
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