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