50
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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50
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5 */
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6
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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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326
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13 typedef struct ngx_http_header_val_s ngx_http_header_val_t;
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14
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15 typedef ngx_int_t (*ngx_http_set_header_pt)(ngx_http_request_t *r,
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16 ngx_http_header_val_t *hv, ngx_str_t *value);
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174
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17
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18
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19 typedef struct {
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464
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20 ngx_str_t name;
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21 ngx_uint_t offset;
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22 ngx_http_set_header_pt handler;
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326
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23 } ngx_http_set_header_t;
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24
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25
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26 struct ngx_http_header_val_s {
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464
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27 ngx_http_complex_value_t value;
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28 ngx_uint_t hash;
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29 ngx_str_t key;
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30 ngx_http_set_header_pt handler;
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31 ngx_uint_t offset;
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326
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32 };
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33
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34
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376
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35 #define NGX_HTTP_EXPIRES_OFF 0
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36 #define NGX_HTTP_EXPIRES_EPOCH 1
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37 #define NGX_HTTP_EXPIRES_MAX 2
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38 #define NGX_HTTP_EXPIRES_ACCESS 3
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39 #define NGX_HTTP_EXPIRES_MODIFIED 4
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394
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40 #define NGX_HTTP_EXPIRES_DAILY 5
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376
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41
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42
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326
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43 typedef struct {
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376
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44 ngx_uint_t expires;
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45 time_t expires_time;
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326
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46 ngx_array_t *headers;
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50
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47 } ngx_http_headers_conf_t;
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48
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49
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326
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50 static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r,
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51 ngx_http_headers_conf_t *conf);
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52 static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r,
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53 ngx_http_header_val_t *hv, ngx_str_t *value);
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54 static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r,
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55 ngx_http_header_val_t *hv, ngx_str_t *value);
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56
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50
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57 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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58 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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122
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59 void *parent, void *child);
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230
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60 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf);
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61 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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62 void *conf);
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122
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63 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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64 void *conf);
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65
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66
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326
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67 static ngx_http_set_header_t ngx_http_set_headers[] = {
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68
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69 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control },
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70
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71 { ngx_string("Last-Modified"),
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72 offsetof(ngx_http_headers_out_t, last_modified),
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73 ngx_http_set_last_modified },
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74
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75 { ngx_null_string, 0, NULL }
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76 };
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77
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78
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79 static ngx_command_t ngx_http_headers_filter_commands[] = {
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80
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81 { ngx_string("expires"),
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122
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82 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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376
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83 |NGX_CONF_TAKE12,
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84 ngx_http_headers_expires,
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85 NGX_HTTP_LOC_CONF_OFFSET,
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86 0,
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87 NULL},
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88
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122
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89 { ngx_string("add_header"),
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90 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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91 |NGX_CONF_TAKE2,
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92 ngx_http_headers_add,
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93 NGX_HTTP_LOC_CONF_OFFSET,
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94 0,
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95 NULL},
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96
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97 ngx_null_command
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98 };
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99
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100
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101 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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102 NULL, /* preconfiguration */
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230
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103 ngx_http_headers_filter_init, /* postconfiguration */
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104
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105 NULL, /* create main configuration */
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106 NULL, /* init main configuration */
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107
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108 NULL, /* create server configuration */
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109 NULL, /* merge server configuration */
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110
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111 ngx_http_headers_create_conf, /* create location configuration */
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112 ngx_http_headers_merge_conf /* merge location configuration */
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113 };
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114
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115
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116 ngx_module_t ngx_http_headers_filter_module = {
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58
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117 NGX_MODULE_V1,
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118 &ngx_http_headers_filter_module_ctx, /* module context */
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119 ngx_http_headers_filter_commands, /* module directives */
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120 NGX_HTTP_MODULE, /* module type */
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90
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121 NULL, /* init master */
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230
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122 NULL, /* init module */
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90
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123 NULL, /* init process */
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124 NULL, /* init thread */
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125 NULL, /* exit thread */
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126 NULL, /* exit process */
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127 NULL, /* exit master */
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128 NGX_MODULE_V1_PADDING
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129 };
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130
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131
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132 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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133
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134
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135 static ngx_int_t
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136 ngx_http_headers_filter(ngx_http_request_t *r)
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137 {
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326
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138 ngx_str_t value;
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139 ngx_uint_t i;
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140 ngx_http_header_val_t *h;
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141 ngx_http_headers_conf_t *conf;
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142
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326
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143 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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144
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145 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
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146 || r != r->main
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212
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147 || (r->headers_out.status != NGX_HTTP_OK
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148 && r->headers_out.status != NGX_HTTP_NO_CONTENT
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149 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
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212
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150 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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151 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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152 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED))
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92
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153 {
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154 return ngx_http_next_header_filter(r);
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155 }
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156
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157 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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326
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158 if (ngx_http_set_expires(r, conf) != NGX_OK) {
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159 return NGX_ERROR;
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160 }
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161 }
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162
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326
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163 if (conf->headers) {
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164 h = conf->headers->elts;
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165 for (i = 0; i < conf->headers->nelts; i++) {
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166
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464
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167 if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) {
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168 return NGX_ERROR;
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58
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169 }
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170
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326
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171 if (h[i].handler(r, &h[i], &value) != NGX_OK) {
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172 return NGX_ERROR;
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173 }
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174 }
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175 }
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176
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326
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177 return ngx_http_next_header_filter(r);
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178 }
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179
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122
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180
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326
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181 static ngx_int_t
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182 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf)
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183 {
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184 size_t len;
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394
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185 time_t now, expires_time, max_age;
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186 ngx_uint_t i;
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187 ngx_table_elt_t *expires, *cc, **ccp;
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188
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326
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189 expires = r->headers_out.expires;
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190
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191 if (expires == NULL) {
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192
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193 expires = ngx_list_push(&r->headers_out.headers);
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194 if (expires == NULL) {
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195 return NGX_ERROR;
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196 }
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197
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198 r->headers_out.expires = expires;
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199
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200 expires->hash = 1;
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201 ngx_str_set(&expires->key, "Expires");
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202 }
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203
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204 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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205 expires->value.len = len - 1;
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206
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207 ccp = r->headers_out.cache_control.elts;
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208
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209 if (ccp == NULL) {
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210
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211 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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212 1, sizeof(ngx_table_elt_t *))
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213 != NGX_OK)
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214 {
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215 return NGX_ERROR;
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122
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216 }
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217
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218 ccp = ngx_array_push(&r->headers_out.cache_control);
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219 if (ccp == NULL) {
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220 return NGX_ERROR;
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221 }
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222
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223 cc = ngx_list_push(&r->headers_out.headers);
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224 if (cc == NULL) {
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225 return NGX_ERROR;
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226 }
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227
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228 cc->hash = 1;
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229 ngx_str_set(&cc->key, "Cache-Control");
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230 *ccp = cc;
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326
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231
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232 } else {
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233 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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234 ccp[i]->hash = 0;
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235 }
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236
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237 cc = ccp[0];
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238 }
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239
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240 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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241 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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570
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242 ngx_str_set(&cc->value, "no-cache");
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243 return NGX_OK;
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244 }
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245
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246 if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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247 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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248 /* 10 years */
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570
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249 ngx_str_set(&cc->value, "max-age=315360000");
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250 return NGX_OK;
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251 }
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252
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382
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253 expires->value.data = ngx_pnalloc(r->pool, len);
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254 if (expires->value.data == NULL) {
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255 return NGX_ERROR;
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256 }
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257
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646
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258 if (conf->expires_time == 0 && conf->expires != NGX_HTTP_EXPIRES_DAILY) {
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326
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259 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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260 ngx_cached_http_time.len + 1);
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261 ngx_str_set(&cc->value, "max-age=0");
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326
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262 return NGX_OK;
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122
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263 }
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264
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265 now = ngx_time();
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266
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646
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267 if (conf->expires == NGX_HTTP_EXPIRES_DAILY) {
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268 expires_time = ngx_next_time(conf->expires_time);
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269 max_age = expires_time - now;
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270
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271 } else if (conf->expires == NGX_HTTP_EXPIRES_ACCESS
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272 || r->headers_out.last_modified_time == -1)
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376
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273 {
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394
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274 expires_time = now + conf->expires_time;
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275 max_age = conf->expires_time;
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276
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376
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277 } else {
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394
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278 expires_time = r->headers_out.last_modified_time + conf->expires_time;
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279 max_age = expires_time - now;
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376
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280 }
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281
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394
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282 ngx_http_time(expires->value.data, expires_time);
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283
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560
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284 if (conf->expires_time < 0 || max_age < 0) {
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285 ngx_str_set(&cc->value, "no-cache");
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286 return NGX_OK;
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287 }
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122
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288
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382
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289 cc->value.data = ngx_pnalloc(r->pool,
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290 sizeof("max-age=") + NGX_TIME_T_LEN + 1);
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291 if (cc->value.data == NULL) {
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292 return NGX_ERROR;
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293 }
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294
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394
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295 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age)
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296 - cc->value.data;
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297
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298 return NGX_OK;
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299 }
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300
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301
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302 static ngx_int_t
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303 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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304 ngx_str_t *value)
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305 {
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306 ngx_table_elt_t *h;
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174
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307
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430
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308 if (value->len) {
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309 h = ngx_list_push(&r->headers_out.headers);
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310 if (h == NULL) {
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311 return NGX_ERROR;
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312 }
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313
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464
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314 h->hash = hv->hash;
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315 h->key = hv->key;
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430
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316 h->value = *value;
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326
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317 }
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318
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319 return NGX_OK;
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320 }
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321
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174
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322
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326
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323 static ngx_int_t
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324 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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325 ngx_str_t *value)
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326 {
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327 ngx_table_elt_t *cc, **ccp;
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328
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329 ccp = r->headers_out.cache_control.elts;
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330
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331 if (ccp == NULL) {
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332
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333 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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334 1, sizeof(ngx_table_elt_t *))
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335 != NGX_OK)
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336 {
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337 return NGX_ERROR;
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122
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338 }
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339 }
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340
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326
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341 ccp = ngx_array_push(&r->headers_out.cache_control);
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342 if (ccp == NULL) {
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343 return NGX_ERROR;
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344 }
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345
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346 cc = ngx_list_push(&r->headers_out.headers);
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347 if (cc == NULL) {
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348 return NGX_ERROR;
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349 }
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350
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351 cc->hash = 1;
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352 ngx_str_set(&cc->key, "Cache-Control");
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326
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353 cc->value = *value;
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354
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355 *ccp = cc;
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356
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357 return NGX_OK;
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358 }
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359
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360
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361 static ngx_int_t
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362 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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363 ngx_str_t *value)
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364 {
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365 ngx_table_elt_t *h, **old;
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366
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367 if (hv->offset) {
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368 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset);
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369
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370 } else {
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371 old = NULL;
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372 }
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373
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348
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374 r->headers_out.last_modified_time = -1;
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375
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326
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376 if (old == NULL || *old == NULL) {
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348
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377
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378 if (value->len == 0) {
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379 return NGX_OK;
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380 }
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381
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326
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382 h = ngx_list_push(&r->headers_out.headers);
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383 if (h == NULL) {
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384 return NGX_ERROR;
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385 }
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386
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387 } else {
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388 h = *old;
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348
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389
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390 if (value->len == 0) {
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391 h->hash = 0;
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392 return NGX_OK;
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393 }
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326
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394 }
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395
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464
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396 h->hash = hv->hash;
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397 h->key = hv->key;
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326
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398 h->value = *value;
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399
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400 return NGX_OK;
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50
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401 }
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402
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403
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404 static void *
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405 ngx_http_headers_create_conf(ngx_conf_t *cf)
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126
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406 {
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50
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407 ngx_http_headers_conf_t *conf;
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408
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122
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409 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
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50
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410 if (conf == NULL) {
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496
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411 return NULL;
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50
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412 }
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413
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122
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414 /*
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415 * set by ngx_pcalloc():
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416 *
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417 * conf->headers = NULL;
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376
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418 * conf->expires_time = 0;
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122
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419 */
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420
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376
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421 conf->expires = NGX_CONF_UNSET_UINT;
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50
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422
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423 return conf;
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424 }
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425
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426
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427 static char *
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428 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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429 {
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430 ngx_http_headers_conf_t *prev = parent;
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431 ngx_http_headers_conf_t *conf = child;
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432
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376
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433 if (conf->expires == NGX_CONF_UNSET_UINT) {
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434 conf->expires = prev->expires;
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435 conf->expires_time = prev->expires_time;
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436
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437 if (conf->expires == NGX_CONF_UNSET_UINT) {
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438 conf->expires = NGX_HTTP_EXPIRES_OFF;
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439 }
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122
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440 }
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441
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442 if (conf->headers == NULL) {
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443 conf->headers = prev->headers;
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444 }
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445
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50
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446 return NGX_CONF_OK;
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447 }
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448
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449
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230
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450 static ngx_int_t
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451 ngx_http_headers_filter_init(ngx_conf_t *cf)
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452 {
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453 ngx_http_next_header_filter = ngx_http_top_header_filter;
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454 ngx_http_top_header_filter = ngx_http_headers_filter;
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455
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456 return NGX_OK;
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457 }
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458
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459
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50
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460 static char *
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461 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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462 {
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463 ngx_http_headers_conf_t *hcf = conf;
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464
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376
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465 ngx_uint_t minus, n;
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50
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466 ngx_str_t *value;
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467
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376
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468 if (hcf->expires != NGX_CONF_UNSET_UINT) {
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50
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469 return "is duplicate";
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470 }
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471
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472 value = cf->args->elts;
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473
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376
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474 if (cf->args->nelts == 2) {
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475
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476 if (ngx_strcmp(value[1].data, "epoch") == 0) {
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477 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
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478 return NGX_CONF_OK;
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479 }
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480
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481 if (ngx_strcmp(value[1].data, "max") == 0) {
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482 hcf->expires = NGX_HTTP_EXPIRES_MAX;
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483 return NGX_CONF_OK;
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484 }
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50
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485
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376
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486 if (ngx_strcmp(value[1].data, "off") == 0) {
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487 hcf->expires = NGX_HTTP_EXPIRES_OFF;
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488 return NGX_CONF_OK;
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|
489 }
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490
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491 hcf->expires = NGX_HTTP_EXPIRES_ACCESS;
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492
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493 n = 1;
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494
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495 } else { /* cf->args->nelts == 3 */
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496
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497 if (ngx_strcmp(value[1].data, "modified") != 0) {
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498 return "invalid value";
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|
499 }
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500
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501 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED;
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502
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503 n = 2;
|
238
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504 }
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|
505
|
394
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506 if (value[n].data[0] == '@') {
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507 value[n].data++;
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508 value[n].len--;
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509 minus = 0;
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510
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511 if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) {
|
640
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512 return "daily time cannot be used with \"modified\" parameter";
|
394
|
513 }
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|
514
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515 hcf->expires = NGX_HTTP_EXPIRES_DAILY;
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|
516
|
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517 } else if (value[n].data[0] == '+') {
|
376
|
518 value[n].data++;
|
|
519 value[n].len--;
|
50
|
520 minus = 0;
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|
521
|
376
|
522 } else if (value[n].data[0] == '-') {
|
|
523 value[n].data++;
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|
524 value[n].len--;
|
50
|
525 minus = 1;
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|
526
|
|
527 } else {
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|
528 minus = 0;
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|
529 }
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|
530
|
376
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531 hcf->expires_time = ngx_parse_time(&value[n], 1);
|
50
|
532
|
376
|
533 if (hcf->expires_time == NGX_ERROR) {
|
50
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534 return "invalid value";
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|
535 }
|
126
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536
|
394
|
537 if (hcf->expires == NGX_HTTP_EXPIRES_DAILY
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|
538 && hcf->expires_time > 24 * 60 * 60)
|
|
539 {
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|
540 return "daily time value must be less than 24 hours";
|
|
541 }
|
|
542
|
376
|
543 if (hcf->expires_time == NGX_PARSE_LARGE_TIME) {
|
50
|
544 return "value must be less than 68 years";
|
|
545 }
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|
546
|
|
547 if (minus) {
|
376
|
548 hcf->expires_time = - hcf->expires_time;
|
50
|
549 }
|
|
550
|
|
551 return NGX_CONF_OK;
|
|
552 }
|
122
|
553
|
|
554
|
|
555 static char *
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|
556 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
557 {
|
|
558 ngx_http_headers_conf_t *hcf = conf;
|
|
559
|
464
|
560 ngx_str_t *value;
|
|
561 ngx_uint_t i;
|
|
562 ngx_http_header_val_t *hv;
|
|
563 ngx_http_set_header_t *set;
|
|
564 ngx_http_compile_complex_value_t ccv;
|
122
|
565
|
|
566 value = cf->args->elts;
|
|
567
|
|
568 if (hcf->headers == NULL) {
|
174
|
569 hcf->headers = ngx_array_create(cf->pool, 1,
|
|
570 sizeof(ngx_http_header_val_t));
|
122
|
571 if (hcf->headers == NULL) {
|
|
572 return NGX_CONF_ERROR;
|
|
573 }
|
|
574 }
|
|
575
|
464
|
576 hv = ngx_array_push(hcf->headers);
|
|
577 if (hv == NULL) {
|
122
|
578 return NGX_CONF_ERROR;
|
|
579 }
|
|
580
|
464
|
581 hv->hash = 1;
|
|
582 hv->key = value[1];
|
|
583 hv->handler = ngx_http_add_header;
|
|
584 hv->offset = 0;
|
174
|
585
|
464
|
586 set = ngx_http_set_headers;
|
|
587 for (i = 0; set[i].name.len; i++) {
|
|
588 if (ngx_strcasecmp(value[1].data, set[i].name.data) != 0) {
|
326
|
589 continue;
|
|
590 }
|
|
591
|
464
|
592 hv->offset = set[i].offset;
|
|
593 hv->handler = set[i].handler;
|
|
594
|
326
|
595 break;
|
|
596 }
|
|
597
|
466
|
598 if (value[2].len == 0) {
|
|
599 ngx_memzero(&hv->value, sizeof(ngx_http_complex_value_t));
|
|
600 return NGX_CONF_OK;
|
|
601 }
|
|
602
|
464
|
603 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
|
174
|
604
|
464
|
605 ccv.cf = cf;
|
|
606 ccv.value = &value[2];
|
|
607 ccv.complex_value = &hv->value;
|
174
|
608
|
464
|
609 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
|
174
|
610 return NGX_CONF_ERROR;
|
|
611 }
|
122
|
612
|
|
613 return NGX_CONF_OK;
|
|
614 }
|