Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_map_module.xml @ 2797:17ed19394953
Documented the mp4_start_key_frame directive.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Mon, 15 Nov 2021 12:52:47 +0000 |
parents | c6b5826b64f7 |
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1 <?xml version="1.0"?> |
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2 |
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3 <!-- |
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4 Copyright (C) Igor Sysoev |
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5 Copyright (C) Nginx, Inc. |
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6 --> |
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7 |
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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9 |
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10 <module name="Module ngx_http_map_module" |
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11 link="/en/docs/http/ngx_http_map_module.html" |
589 | 12 lang="en" |
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13 rev="5"> |
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
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18 The <literal>ngx_http_map_module</literal> module creates variables |
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19 whose values depend on values of other variables. |
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20 </para> |
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21 |
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22 </section> |
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23 |
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24 |
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25 <section id="example" name="Example Configuration"> |
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26 |
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27 <para> |
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28 <example> |
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29 map $http_host $name { |
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30 hostnames; |
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31 |
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32 default 0; |
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33 |
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34 example.com 1; |
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35 *.example.com 1; |
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36 example.org 2; |
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37 *.example.org 2; |
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38 .example.net 3; |
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39 wap.* 4; |
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40 } |
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41 |
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42 map $http_user_agent $mobile { |
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43 default 0; |
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44 "~Opera Mini" 1; |
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45 } |
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46 </example> |
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47 </para> |
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48 |
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49 </section> |
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50 |
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51 |
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52 <section id="directives" name="Directives"> |
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53 |
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54 <directive name="map"> |
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55 <syntax block="yes"> |
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56 <value>string</value> |
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57 <value>$variable</value></syntax> |
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58 <default/> |
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59 <context>http</context> |
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60 |
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61 <para> |
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62 Creates a new variable whose value |
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63 depends on values of one or more of the source variables |
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64 specified in the first parameter. |
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65 <note> |
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66 Before version 0.9.0 only a single variable could be |
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67 specified in the first parameter. |
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68 </note> |
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69 </para> |
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70 |
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71 <para> |
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72 <note> |
966 | 73 Since variables are evaluated only when they are used, the mere declaration |
74 even of a large number of “<literal>map</literal>” variables | |
75 does not add any extra costs to request processing. | |
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76 </note> |
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77 </para> |
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78 |
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79 <para> |
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80 Parameters inside the <literal>map</literal> block specify a mapping |
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81 between source and resulting values. |
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82 </para> |
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83 |
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84 <para> |
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85 Source values are specified as strings or regular expressions (0.9.6). |
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86 </para> |
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87 |
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88 <para> |
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89 Strings are matched ignoring the case. |
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90 </para> |
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91 |
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92 <para> |
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93 A regular expression should either start from the “<literal>~</literal>” |
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94 symbol for a case-sensitive matching, or from the “<literal>~*</literal>” |
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95 symbols (1.0.4) for case-insensitive matching. |
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96 A regular expression can contain named and positional captures |
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97 that can later be used in other directives along with the |
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98 resulting variable. |
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99 </para> |
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100 |
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101 <para> |
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102 If a source value matches one of the names of special parameters |
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103 described below, it should be prefixed with the “<literal>\</literal>” symbol. |
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104 </para> |
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105 |
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106 <para> |
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107 The resulting value can contain text, |
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108 variable (0.9.0), and their combination (1.11.0). |
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109 </para> |
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110 |
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111 <para> |
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112 The following special parameters are also supported: |
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113 <list type="tag"> |
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114 <tag-name><literal>default</literal> <value>value</value></tag-name> |
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115 <tag-desc> |
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116 sets the resulting value if the source value matches none |
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117 of the specified variants. |
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118 When <literal>default</literal> is not specified, the default |
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119 resulting value will be an empty string. |
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120 </tag-desc> |
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121 |
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122 <tag-name><literal>hostnames</literal></tag-name> |
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123 <tag-desc> |
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125 <example> |
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126 *.example.com 1; |
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127 example.* 1; |
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128 </example> |
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129 The following two records |
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130 <example> |
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131 example.com 1; |
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132 *.example.com 1; |
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133 </example> |
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134 can be combined: |
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135 <example> |
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136 .example.com 1; |
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137 </example> |
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138 This parameter should be specified before the list of values. |
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139 </tag-desc> |
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140 |
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141 <tag-name><literal>include</literal> <value>file</value></tag-name> |
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142 <tag-desc> |
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143 includes a file with values. |
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144 There can be several inclusions. |
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145 </tag-desc> |
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146 |
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147 <tag-name id="volatile"><literal>volatile</literal></tag-name> |
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148 <tag-desc> |
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149 indicates that the variable is not cacheable (1.11.7). |
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150 </tag-desc> |
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151 |
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152 </list> |
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153 </para> |
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154 |
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155 <para> |
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156 If the source value matches more than one of the specified variants, |
966 | 157 e.g. both a mask and a regular expression match, the first matching |
158 variant will be chosen, in the following order of priority: | |
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159 <list type="enum"> |
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160 |
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161 <listitem> |
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162 string value without a mask |
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163 </listitem> |
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164 |
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165 <listitem> |
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166 longest string value with a prefix mask, |
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167 e.g. “<literal>*.example.com</literal>” |
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168 </listitem> |
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169 |
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170 <listitem> |
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171 longest string value with a suffix mask, |
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172 e.g. “<literal>mail.*</literal>” |
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173 </listitem> |
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174 |
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175 <listitem> |
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176 first matching regular expression |
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177 (in order of appearance in a configuration file) |
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178 </listitem> |
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179 |
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180 <listitem> |
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181 default value |
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182 </listitem> |
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183 |
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184 </list> |
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185 </para> |
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186 |
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187 </directive> |
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188 |
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189 |
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190 <directive name="map_hash_bucket_size"> |
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191 <syntax><value>size</value></syntax> |
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192 <default>32|64|128</default> |
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193 <context>http</context> |
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194 |
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195 <para> |
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196 Sets the bucket size for the <link id="map"/> variables hash tables. |
966 | 197 Default value depends on the processor’s cache line size. |
198 The details of setting up hash tables are provided in a separate | |
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199 <link doc="../hash.xml">document</link>. |
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200 </para> |
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201 |
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202 </directive> |
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203 |
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204 |
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205 <directive name="map_hash_max_size"> |
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206 <syntax><value>size</value></syntax> |
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207 <default>2048</default> |
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208 <context>http</context> |
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209 |
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210 <para> |
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211 Sets the maximum <value>size</value> of the <link id="map"/> variables |
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212 hash tables. |
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214 <link doc="../hash.xml">document</link>. |
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215 </para> |
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216 |
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217 </directive> |
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218 |
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219 </section> |
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220 |
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221 </module> |