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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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12 typedef struct {
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58
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13 ngx_str_t name;
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14 ngx_array_t *lengths;
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15 ngx_array_t *values;
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16 } ngx_http_index_t;
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17
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18
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19 typedef struct {
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20 ngx_array_t *indices; /* array of ngx_http_index_t */
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50
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21 size_t max_index_len;
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22 } ngx_http_index_loc_conf_t;
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23
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24
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25 typedef struct {
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58
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26 ngx_uint_t current;
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27
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106
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28 ngx_str_t path;
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58
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29 ngx_str_t index;
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30
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31 ngx_uint_t tested; /* unsigned tested:1 */
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50
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32 } ngx_http_index_ctx_t;
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33
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34
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35 #define NGX_HTTP_DEFAULT_INDEX "index.html"
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36
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37
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38 static ngx_int_t ngx_http_index_test_dir(ngx_http_request_t *r,
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58
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39 ngx_http_index_ctx_t *ctx);
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40 static ngx_int_t ngx_http_index_error(ngx_http_request_t *r,
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58
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41 ngx_http_index_ctx_t *ctx, ngx_err_t err);
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42
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43 static ngx_int_t ngx_http_index_init(ngx_cycle_t *cycle);
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44 static void *ngx_http_index_create_loc_conf(ngx_conf_t *cf);
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45 static char *ngx_http_index_merge_loc_conf(ngx_conf_t *cf,
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58
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46 void *parent, void *child);
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50
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47 static char *ngx_http_index_set_index(ngx_conf_t *cf, ngx_command_t *cmd,
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58
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48 void *conf);
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50
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49
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50
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51 static ngx_command_t ngx_http_index_commands[] = {
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52
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53 { ngx_string("index"),
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58
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54 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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55 ngx_http_index_set_index,
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56 NGX_HTTP_LOC_CONF_OFFSET,
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57 0,
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58 NULL },
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59
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60 #if (NGX_HTTP_CACHE)
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61
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62 { ngx_string("index_cache"),
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63 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE3,
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64 ngx_http_set_cache_slot,
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65 NGX_HTTP_LOC_CONF_OFFSET,
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66 offsetof(ngx_http_index_loc_conf_t, index_cache),
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67 NULL },
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68
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69 #endif
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70
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71 ngx_null_command
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72 };
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73
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74
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75 ngx_http_module_t ngx_http_index_module_ctx = {
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58
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76 NULL, /* preconfiguration */
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77 NULL, /* postconfiguration */
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78
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79 NULL, /* create main configuration */
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80 NULL, /* init main configuration */
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81
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82 NULL, /* create server configuration */
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83 NULL, /* merge server configuration */
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84
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85 ngx_http_index_create_loc_conf, /* create location configration */
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86 ngx_http_index_merge_loc_conf /* merge location configration */
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87 };
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88
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89
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90 ngx_module_t ngx_http_index_module = {
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58
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91 NGX_MODULE_V1,
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92 &ngx_http_index_module_ctx, /* module context */
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93 ngx_http_index_commands, /* module directives */
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94 NGX_HTTP_MODULE, /* module type */
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90
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95 NULL, /* init master */
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96 ngx_http_index_init, /* init module */
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90
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97 NULL, /* init process */
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98 NULL, /* init thread */
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99 NULL, /* exit thread */
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100 NULL, /* exit process */
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101 NULL, /* exit master */
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102 NGX_MODULE_V1_PADDING
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50
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103 };
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104
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105
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106 /*
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107 * Try to open the first index file before the test of the directory existence
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108 * because the valid requests should be many more than invalid ones.
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109 * If open() would fail, then stat() should be more quickly because some data
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110 * is already cached in the kernel.
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111 * Besides, Win32 has ERROR_PATH_NOT_FOUND (NGX_ENOTDIR).
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112 * Unix has ENOTDIR error, although it less helpfull - it points only
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113 * that path contains the usual file in place of the directory.
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114 */
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115
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58
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116 static ngx_int_t
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117 ngx_http_index_handler(ngx_http_request_t *r)
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118 {
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119 u_char *last;
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120 size_t len;
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121 ngx_fd_t fd;
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122 ngx_int_t rc;
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123 ngx_err_t err;
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106
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124 ngx_str_t uri;
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125 ngx_log_t *log;
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126 ngx_uint_t i;
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127 ngx_http_index_t *index;
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128 ngx_http_index_ctx_t *ctx;
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112
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129 ngx_pool_cleanup_t *cln;
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130 ngx_pool_cleanup_file_t *clnf;
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58
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131 ngx_http_script_code_pt code;
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132 ngx_http_script_engine_t e;
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133 ngx_http_core_loc_conf_t *clcf;
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134 ngx_http_index_loc_conf_t *ilcf;
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135 ngx_http_script_len_code_pt lcode;
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136
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137 if (r->uri.data[r->uri.len - 1] != '/') {
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138 return NGX_DECLINED;
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139 }
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140
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141 /* TODO: Win32 */
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142 if (r->zero_in_uri) {
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143 return NGX_DECLINED;
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144 }
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145
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186
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146 if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
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147 return NGX_DECLINED;
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148 }
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149
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150 log = r->connection->log;
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151
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152 /*
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153 * we use context because the handler supports an async file opening,
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154 * and may be called several times
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155 */
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156
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157 ilcf = ngx_http_get_module_loc_conf(r, ngx_http_index_module);
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158
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159 ctx = ngx_http_get_module_ctx(r, ngx_http_index_module);
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160 if (ctx == NULL) {
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161
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162 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_index_ctx_t));
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163 if (ctx == NULL) {
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164 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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165 }
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166
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167 ngx_http_set_ctx(r, ctx, ngx_http_index_module);
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58
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168 }
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169
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170 index = ilcf->indices->elts;
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171 for (i = ctx->current; i < ilcf->indices->nelts; i++) {
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172
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173 if (index[i].lengths == NULL) {
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174
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175 if (index[i].name.data[0] == '/') {
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176 return ngx_http_internal_redirect(r, &index[i].name, &r->args);
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177 }
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178
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179 len = ilcf->max_index_len;
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180 ctx->index.len = index[i].name.len;
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181
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58
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182 } else {
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183 ngx_memzero(&e, sizeof(ngx_http_script_engine_t));
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184
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185 e.ip = index[i].lengths->elts;
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186 e.request = r;
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122
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187 e.flushed = 1;
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188
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112
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189 /* 1 byte for terminating '\0' */
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190
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112
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191 len = 1;
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192
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58
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193 while (*(uintptr_t *) e.ip) {
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194 lcode = *(ngx_http_script_len_code_pt *) e.ip;
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195 len += lcode(&e);
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196 }
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197
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198 ctx->index.len = len;
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112
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199
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200 /* 16 bytes are preallocation */
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201
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202 len += 16;
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58
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203 }
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204
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106
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205 if (len > ctx->path.len) {
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206
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207 last = ngx_http_map_uri_to_path(r, &ctx->path, len);
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208 if (last == NULL) {
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209 return NGX_ERROR;
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210 }
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106
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211
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212 ctx->index.data = last;
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213 }
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214
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215 if (index[i].values == NULL) {
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106
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216
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217 /* index[i].name.len includes the terminating '\0' */
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218
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219 ngx_memcpy(ctx->index.data, index[i].name.data, index[i].name.len);
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220
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58
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221 } else {
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222 e.ip = index[i].values->elts;
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223 e.pos = ctx->index.data;
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224
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225 while (*(uintptr_t *) e.ip) {
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226 code = *(ngx_http_script_code_pt *) e.ip;
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227 code((ngx_http_script_engine_t *) &e);
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228 }
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229
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58
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230 if (*ctx->index.data == '/') {
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231 ctx->index.len--;
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232 return ngx_http_internal_redirect(r, &ctx->index, &r->args);
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233 }
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234
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235 *e.pos++ = '\0';
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236 }
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237
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106
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238 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
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239 "open index \"%s\"", ctx->path.data);
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240
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112
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241 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_pool_cleanup_file_t));
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242 if (cln == NULL) {
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243 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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244 }
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245
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106
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246 fd = ngx_open_file(ctx->path.data, NGX_FILE_RDONLY, NGX_FILE_OPEN);
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247
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248 if (fd == (ngx_fd_t) NGX_AGAIN) {
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249 ctx->current = i;
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250 return NGX_AGAIN;
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251 }
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252
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253 if (fd == NGX_INVALID_FILE) {
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254 err = ngx_errno;
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255
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256 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, err,
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106
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257 ngx_open_file_n " \"%s\" failed", ctx->path.data);
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258
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259 if (err == NGX_ENOTDIR) {
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260 return ngx_http_index_error(r, ctx, err);
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261
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262 } else if (err == NGX_EACCES) {
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263 return ngx_http_index_error(r, ctx, err);
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264 }
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265
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266 if (!ctx->tested) {
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267 rc = ngx_http_index_test_dir(r, ctx);
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268
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269 if (rc != NGX_OK) {
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270 return rc;
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271 }
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272
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273 ctx->tested = 1;
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274 }
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275
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276 if (err == NGX_ENOENT) {
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277 continue;
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278 }
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279
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280 ngx_log_error(NGX_LOG_ERR, log, err,
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281 ngx_open_file_n " \"%s\" failed", ctx->path.data);
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282
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283 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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284 }
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285
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112
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286 cln->handler = ngx_pool_cleanup_file;
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287 clnf = cln->data;
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288
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112
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289 clnf->fd = fd;
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290 clnf->name = ctx->path.data;
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291 clnf->log = r->pool->log;
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292
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106
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293 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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294
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106
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295 uri.len = r->uri.len + ctx->index.len - 1;
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296
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297 if (!clcf->alias) {
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144
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298 uri.data = ctx->path.data + r->root_length;
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106
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299
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300 } else {
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301 uri.data = ngx_palloc(r->pool, uri.len);
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302 if (uri.data == NULL) {
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303 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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304 }
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305
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122
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306 last = ngx_copy(uri.data, r->uri.data, r->uri.len);
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106
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307 ngx_memcpy(last, ctx->index.data, ctx->index.len - 1);
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50
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308 }
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309
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106
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310 return ngx_http_internal_redirect(r, &uri, &r->args);
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311 }
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312
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313 return NGX_DECLINED;
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314 }
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315
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316
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317 static ngx_int_t
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318 ngx_http_index_test_dir(ngx_http_request_t *r, ngx_http_index_ctx_t *ctx)
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319 {
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320 ngx_err_t err;
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321 ngx_file_info_t fi;
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322
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323 *(ctx->index.data - 1) = '\0';
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324
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325 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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106
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326 "http index check dir: \"%s\"", ctx->path.data);
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327
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106
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328 if (ngx_file_info(ctx->path.data, &fi) == -1) {
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329
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330 err = ngx_errno;
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331
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332 if (err == NGX_ENOENT) {
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333 *(ctx->index.data - 1) = '/';
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334 return ngx_http_index_error(r, ctx, err);
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335 }
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336
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337 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
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106
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338 ngx_file_info_n " \"%s\" failed", ctx->path.data);
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339
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340 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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341 }
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342
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58
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343 *(ctx->index.data - 1) = '/';
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344
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58
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345 if (ngx_is_dir(&fi)) {
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50
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346 return NGX_OK;
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347 }
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348
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58
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349 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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106
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350 "\"%s\" is not a directory", ctx->path.data);
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58
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351
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352 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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50
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353 }
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354
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355
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58
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356 static ngx_int_t
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357 ngx_http_index_error(ngx_http_request_t *r, ngx_http_index_ctx_t *ctx,
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358 ngx_err_t err)
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50
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359 {
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360 if (err == NGX_EACCES) {
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361 ngx_log_error(NGX_LOG_ERR, r->connection->log, err,
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106
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362 "\"%s\" is forbidden", ctx->path.data);
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126
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363
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364 return NGX_HTTP_FORBIDDEN;
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365 }
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366
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367 ngx_log_error(NGX_LOG_ERR, r->connection->log, err,
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106
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368 "\"%s\" is not found", ctx->path.data);
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58
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369
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370 return NGX_HTTP_NOT_FOUND;
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371 }
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372
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373
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58
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374 static void *
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375 ngx_http_index_create_loc_conf(ngx_conf_t *cf)
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376 {
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377 ngx_http_index_loc_conf_t *conf;
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378
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379 conf = ngx_palloc(cf->pool, sizeof(ngx_http_index_loc_conf_t));
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380 if (conf == NULL) {
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381 return NGX_CONF_ERROR;
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382 }
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383
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384 conf->indices = NULL;
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385 conf->max_index_len = 1;
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386
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387 return conf;
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388 }
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389
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390
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391 static char *
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392 ngx_http_index_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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393 {
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394 ngx_http_index_loc_conf_t *prev = parent;
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395 ngx_http_index_loc_conf_t *conf = child;
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396
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397 ngx_http_index_t *index;
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398
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399 if (conf->indices == NULL) {
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400 conf->indices = prev->indices;
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401 conf->max_index_len = prev->max_index_len;
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402 }
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403
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404 if (conf->indices == NULL) {
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405 conf->indices = ngx_array_create(cf->pool, 1, sizeof(ngx_http_index_t));
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406 if (conf->indices == NULL) {
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407 return NGX_CONF_ERROR;
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408 }
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409
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410 index = ngx_array_push(conf->indices);
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411 if (index == NULL) {
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412 return NGX_CONF_ERROR;
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413 }
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414
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415 index->name.len = sizeof(NGX_HTTP_DEFAULT_INDEX);
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416 index->name.data = (u_char *) NGX_HTTP_DEFAULT_INDEX;
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417 index->lengths = NULL;
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418 index->values = NULL;
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419
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420 conf->max_index_len = sizeof(NGX_HTTP_DEFAULT_INDEX);
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421
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422 return NGX_CONF_OK;
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423 }
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424
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425 return NGX_CONF_OK;
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426 }
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427
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428
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429 /* TODO: warn about duplicate indices */
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430
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431 static char *
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432 ngx_http_index_set_index(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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433 {
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434 ngx_http_index_loc_conf_t *ilcf = conf;
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435
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436 ngx_uint_t i, n;
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437 ngx_str_t *value;
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438 ngx_http_index_t *index;
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439 ngx_http_script_compile_t sc;
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440
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441 if (ilcf->indices == NULL) {
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442 ilcf->indices = ngx_array_create(cf->pool, 2, sizeof(ngx_http_index_t));
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443 if (ilcf->indices == NULL) {
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444 return NGX_CONF_ERROR;
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445 }
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446 }
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447
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448 value = cf->args->elts;
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449
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450 for (i = 1; i < cf->args->nelts; i++) {
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451 if (value[i].data[0] == '/' && i != cf->args->nelts - 1) {
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452 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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453 "only the last index in \"index\" directive "
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454 "may be absolute");
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455 return NGX_CONF_ERROR;
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456 }
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457
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458 if (value[i].len == 0) {
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459 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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460 "index \"%V\" in \"index\" directive is invalid",
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461 &value[1]);
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462 return NGX_CONF_ERROR;
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463 }
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464
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465 index = ngx_array_push(ilcf->indices);
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466 if (index == NULL) {
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467 return NGX_CONF_ERROR;
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468 }
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469
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470 index->name.len = value[i].len;
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471 index->name.data = value[i].data;
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472 index->lengths = NULL;
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473 index->values = NULL;
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474
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475 n = ngx_http_script_variables_count(&value[i]);
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476
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477 if (n == 0) {
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478 if (ilcf->max_index_len != 0
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479 && ilcf->max_index_len < index->name.len)
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480 {
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481 ilcf->max_index_len = index->name.len;
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482 }
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483
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122
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484 /* include the terminating '\0' to the length to use ngx_copy() */
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106
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485 index->name.len++;
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486
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58
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487 continue;
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488 }
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489
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490 ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
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491
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492 sc.cf = cf;
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493 sc.source = &value[i];
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494 sc.lengths = &index->lengths;
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495 sc.values = &index->values;
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496 sc.variables = n;
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497 sc.complete_lengths = 1;
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498 sc.complete_values = 1;
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499
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500 if (ngx_http_script_compile(&sc) != NGX_OK) {
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501 return NGX_CONF_ERROR;
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502 }
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503
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504 ilcf->max_index_len = 0;
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505 }
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506
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507 return NGX_CONF_OK;
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508 }
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509
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510
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511 static ngx_int_t
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512 ngx_http_index_init(ngx_cycle_t *cycle)
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50
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513 {
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514 ngx_http_handler_pt *h;
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515 ngx_http_core_main_conf_t *cmcf;
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516
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517 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
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518
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519 h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);
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520 if (h == NULL) {
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521 return NGX_ERROR;
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522 }
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523
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524 *h = ngx_http_index_handler;
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525
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526 return NGX_OK;
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527 }
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