Mercurial > hg > nginx
annotate src/http/modules/ngx_http_not_modified_filter_module.c @ 5197:2ba8bb27114e
Version bump.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Sat, 11 May 2013 18:43:28 +0400 |
parents | 5b93a9ac60ed |
children | bb3d74fc4aea |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_http.h> |
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11 |
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12 |
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13 static ngx_uint_t ngx_http_test_if_unmodified(ngx_http_request_t *r); |
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14 static ngx_uint_t ngx_http_test_if_modified(ngx_http_request_t *r); |
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15 static ngx_uint_t ngx_http_test_if_match(ngx_http_request_t *r, |
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16 ngx_table_elt_t *header); |
681 | 17 static ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf); |
135
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18 |
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19 |
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20 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = { |
509 | 21 NULL, /* preconfiguration */ |
681 | 22 ngx_http_not_modified_filter_init, /* postconfiguration */ |
177
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23 |
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24 NULL, /* create main configuration */ |
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25 NULL, /* init main configuration */ |
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26 |
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27 NULL, /* create server configuration */ |
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28 NULL, /* merge server configuration */ |
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29 |
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30 NULL, /* create location configuration */ |
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31 NULL /* merge location configuration */ |
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32 }; |
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33 |
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34 |
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35 ngx_module_t ngx_http_not_modified_filter_module = { |
509 | 36 NGX_MODULE_V1, |
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37 &ngx_http_not_modified_filter_module_ctx, /* module context */ |
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38 NULL, /* module directives */ |
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39 NGX_HTTP_MODULE, /* module type */ |
541 | 40 NULL, /* init master */ |
681 | 41 NULL, /* init module */ |
541 | 42 NULL, /* init process */ |
43 NULL, /* init thread */ | |
44 NULL, /* exit thread */ | |
45 NULL, /* exit process */ | |
46 NULL, /* exit master */ | |
47 NGX_MODULE_V1_PADDING | |
135
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48 }; |
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49 |
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50 |
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51 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
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52 |
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53 |
2702 | 54 static ngx_int_t |
55 ngx_http_not_modified_header_filter(ngx_http_request_t *r) | |
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56 { |
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57 if (r->headers_out.status != NGX_HTTP_OK |
597 | 58 || r != r->main |
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59 || r->headers_out.last_modified_time == -1) |
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60 { |
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61 return ngx_http_next_header_filter(r); |
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62 } |
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63 |
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64 if (r->headers_in.if_unmodified_since |
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65 && !ngx_http_test_if_unmodified(r)) |
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66 { |
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67 return ngx_http_filter_finalize_request(r, NULL, |
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68 NGX_HTTP_PRECONDITION_FAILED); |
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69 } |
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70 |
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71 if (r->headers_in.if_match |
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72 && !ngx_http_test_if_match(r, r->headers_in.if_match)) |
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73 { |
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74 return ngx_http_filter_finalize_request(r, NULL, |
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75 NGX_HTTP_PRECONDITION_FAILED); |
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76 } |
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77 |
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78 if (r->headers_in.if_modified_since || r->headers_in.if_none_match) { |
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79 |
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80 if (r->headers_in.if_modified_since |
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81 && ngx_http_test_if_modified(r)) |
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82 { |
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83 return ngx_http_next_header_filter(r); |
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84 } |
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85 |
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86 if (r->headers_in.if_none_match |
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87 && !ngx_http_test_if_match(r, r->headers_in.if_none_match)) |
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88 { |
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89 return ngx_http_next_header_filter(r); |
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90 } |
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91 |
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92 /* not modified */ |
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93 |
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94 r->headers_out.status = NGX_HTTP_NOT_MODIFIED; |
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95 r->headers_out.status_line.len = 0; |
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96 r->headers_out.content_type.len = 0; |
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97 ngx_http_clear_content_length(r); |
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98 ngx_http_clear_accept_ranges(r); |
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99 |
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100 if (r->headers_out.content_encoding) { |
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101 r->headers_out.content_encoding->hash = 0; |
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102 r->headers_out.content_encoding = NULL; |
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103 } |
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104 |
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105 return ngx_http_next_header_filter(r); |
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106 } |
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107 |
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108 return ngx_http_next_header_filter(r); |
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109 } |
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110 |
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111 |
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112 static ngx_uint_t |
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113 ngx_http_test_if_unmodified(ngx_http_request_t *r) |
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114 { |
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115 time_t iums; |
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116 |
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117 iums = ngx_http_parse_time(r->headers_in.if_unmodified_since->value.data, |
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118 r->headers_in.if_unmodified_since->value.len); |
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119 |
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120 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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121 "http iums:%d lm:%d", iums, r->headers_out.last_modified_time); |
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122 |
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123 if (iums >= r->headers_out.last_modified_time) { |
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124 return 1; |
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125 } |
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126 |
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127 return 0; |
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128 } |
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129 |
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130 |
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131 static ngx_uint_t |
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132 ngx_http_test_if_modified(ngx_http_request_t *r) |
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133 { |
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134 time_t ims; |
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135 ngx_http_core_loc_conf_t *clcf; |
135
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136 |
2496 | 137 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
138 | |
139 if (clcf->if_modified_since == NGX_HTTP_IMS_OFF) { | |
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140 return 1; |
2496 | 141 } |
142 | |
135
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143 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data, |
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144 r->headers_in.if_modified_since->value.len); |
577 | 145 |
257
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146 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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147 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time); |
135
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148 |
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149 if (ims == r->headers_out.last_modified_time) { |
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150 return 0; |
135
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151 } |
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152 |
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153 if (clcf->if_modified_since == NGX_HTTP_IMS_EXACT |
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154 || ims < r->headers_out.last_modified_time) |
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155 { |
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156 return 1; |
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157 } |
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158 |
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159 return 0; |
135
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160 } |
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161 |
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162 |
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163 static ngx_uint_t |
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164 ngx_http_test_if_match(ngx_http_request_t *r, ngx_table_elt_t *header) |
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165 { |
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166 u_char *start, *end, ch; |
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167 ngx_str_t *etag, *list; |
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168 |
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169 list = &header->value; |
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170 |
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171 if (list->len == 1 && list->data[0] == '*') { |
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172 return 1; |
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173 } |
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174 |
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175 if (r->headers_out.etag == NULL) { |
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176 return 0; |
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177 } |
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178 |
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179 etag = &r->headers_out.etag->value; |
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180 |
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181 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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182 "http im:\"%V\" etag:%V", list, etag); |
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183 |
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184 start = list->data; |
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185 end = list->data + list->len; |
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186 |
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187 while (start < end) { |
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188 |
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189 if (etag->len > (size_t) (end - start)) { |
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190 return 0; |
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191 } |
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192 |
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193 if (ngx_strncmp(start, etag->data, etag->len) != 0) { |
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194 goto skip; |
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195 } |
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196 |
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197 start += etag->len; |
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198 |
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199 while (start < end) { |
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200 ch = *start; |
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201 |
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202 if (ch == ' ' || ch == '\t') { |
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203 start++; |
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204 continue; |
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205 } |
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206 |
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207 break; |
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208 } |
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209 |
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210 if (start == end || *start == ',') { |
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211 return 1; |
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212 } |
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213 |
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214 skip: |
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215 |
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216 while (start < end && *start != ',') { start++; } |
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217 while (start < end) { |
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218 ch = *start; |
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219 |
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220 if (ch == ' ' || ch == '\t' || ch == ',') { |
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221 start++; |
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222 continue; |
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|
223 } |
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224 |
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225 break; |
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226 } |
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227 } |
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228 |
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229 return 0; |
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230 } |
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231 |
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|
232 |
2702 | 233 static ngx_int_t |
234 ngx_http_not_modified_filter_init(ngx_conf_t *cf) | |
135
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|
235 { |
155
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153
diff
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|
236 ngx_http_next_header_filter = ngx_http_top_header_filter; |
135
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|
237 ngx_http_top_header_filter = ngx_http_not_modified_header_filter; |
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|
238 |
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|
239 return NGX_OK; |
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|
240 } |