Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_map_module.xml @ 2014:6e66487c5756
Limit_req: document what happens on zone exhaustion (ticket #1133)
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 08 Aug 2017 09:23:57 +0300 |
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 |
346 | 10 <module name="Модуль ngx_http_map_module" |
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11 link="/ru/docs/http/ngx_http_map_module.html" |
589 | 12 lang="ru" |
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13 rev="5"> |
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14 |
110
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15 <section id="summary"> |
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16 |
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17 <para> |
346 | 18 Модуль <literal>ngx_http_map_module</literal> создаёт переменные, |
19 значения которых зависят от значений других переменных. | |
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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 |
346 | 25 <section id="example" name="Пример конфигурации"> |
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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 { |
346 | 30 hostnames; |
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31 |
346 | 32 default 0; |
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33 |
346 | 34 example.com 1; |
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; |
346 | 39 wap.* 4; |
40 } | |
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41 |
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42 map $http_user_agent $mobile { |
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43 default 0; |
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44 "~Opera Mini" 1; |
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45 } |
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46 </example> |
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47 </para> |
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48 |
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49 </section> |
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50 |
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51 |
346 | 52 <section id="directives" name="Директивы"> |
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53 |
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54 <directive name="map"> |
346 | 55 <syntax block="yes"> |
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56 <value>строка</value> |
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57 <value>$переменная</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 Создаёт новую переменную, значение которой |
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63 зависит от значений одной или более исходных переменных, |
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64 указанных в первом параметре. |
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65 <note> |
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66 До версии 0.9.0 в качестве первого параметра можно было |
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67 указать только одну переменную. |
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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> |
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73 Поскольку переменные вычисляются только в момент использования, |
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74 само по себе наличие даже большого числа объявлений переменных |
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75 “<literal>map</literal>” не влечёт за собой никаких дополнительных |
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76 расходов на обработку запросов. |
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77 </note> |
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78 </para> |
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79 |
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80 <para> |
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81 Параметры внутри блока <literal>map</literal> задают соответствие |
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82 между исходными и результирующими значениями. |
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83 </para> |
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84 |
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85 <para> |
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86 Исходные значения задаются строками или регулярными выражениями (0.9.6). |
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87 </para> |
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88 |
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89 <para> |
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90 Строки проверяются без учёта регистра. |
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91 </para> |
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92 |
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93 <para> |
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94 Перед регулярным выражением ставится символ “<literal>~</literal>”, |
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95 если при сравнении следует учитывать регистр символов, либо символы |
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96 “<literal>~*</literal>” (1.0.4), если регистр символов учитывать не нужно. |
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97 Регулярное выражение может содержать именованные и позиционные выделения, |
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98 которые могут затем использоваться в других директивах совместно с |
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99 результирующей переменной. |
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100 </para> |
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101 |
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102 <para> |
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103 Если исходное значение совпадает с именем одного из специальных параметров, |
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104 описанных ниже, перед ним следует поставить символ “<literal>\</literal>”. |
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105 </para> |
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106 |
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107 <para> |
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108 В качестве результирующего значения можно указать текст, |
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109 переменную (0.9.0) и их комбинации (1.11.0). |
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110 </para> |
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111 |
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112 <para> |
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113 Также поддерживаются следующие специальные параметры: |
346 | 114 <list type="tag"> |
115 <tag-name><literal>default</literal> <value>значение</value></tag-name> | |
116 <tag-desc> | |
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117 задаёт результирующее значение, если исходное значение не |
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118 совпадает ни с одним из перечисленных. |
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119 Если параметр <literal>default</literal> не указан, результирующим значением |
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120 по умолчанию будет пустая строка. |
346 | 121 </tag-desc> |
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122 |
346 | 123 <tag-name><literal>hostnames</literal></tag-name> |
124 <tag-desc> | |
125 указывает, что в качестве исходных значений можно | |
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126 использовать маску для первой или последней части имени хоста, например, |
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127 <example> |
346 | 128 *.example.com 1; |
129 example.* 1; | |
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130 </example> |
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131 Вместо двух записей |
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132 <example> |
346 | 133 example.com 1; |
134 *.example.com 1; | |
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135 </example> |
346 | 136 можно использовать одну: |
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137 <example> |
346 | 138 .example.com 1; |
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139 </example> |
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140 Этот параметр следует указывать перед списком значений. |
346 | 141 </tag-desc> |
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142 |
346 | 143 <tag-name><literal>include</literal> <value>файл</value></tag-name> |
144 <tag-desc> | |
145 включает файл со значениями. | |
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146 Включений может быть несколько. |
346 | 147 </tag-desc> |
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148 |
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149 <tag-name id="volatile"><literal>volatile</literal></tag-name> |
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150 <tag-desc> |
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151 указывает, что переменная не кэшируется (1.11.7). |
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152 </tag-desc> |
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153 |
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154 </list> |
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155 </para> |
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156 |
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157 <para> |
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158 Если исходному значению соответствует несколько из указанных вариантов, |
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159 например, одновременно подходят и маска, и регулярное выражение, |
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160 будет выбран первый подходящий вариант в следующем порядке приоритета: |
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161 <list type="enum"> |
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162 |
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163 <listitem> |
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164 строковое значение без маски |
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165 </listitem> |
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166 |
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167 <listitem> |
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168 самое длинное строковое значение с маской в начале, |
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169 например “<literal>*.example.com</literal>” |
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170 </listitem> |
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171 |
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172 <listitem> |
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173 самое длинное строковое значение с маской в конце, |
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174 например “<literal>mail.*</literal>” |
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175 </listitem> |
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176 |
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177 <listitem> |
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178 первое подходящее регулярное выражение |
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179 (в порядке следования в конфигурационном файле) |
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180 </listitem> |
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181 |
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182 <listitem> |
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183 значение по умолчанию (<literal>default</literal>) |
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184 </listitem> |
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185 |
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186 </list> |
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187 </para> |
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188 |
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189 </directive> |
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190 |
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191 |
346 | 192 <directive name="map_hash_bucket_size"> |
193 <syntax><value>размер</value></syntax> | |
194 <default>32|64|128</default> | |
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195 <context>http</context> |
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196 |
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197 <para> |
346 | 198 Задаёт размер корзины в хэш-таблицах для переменных <link id="map"/>. |
199 Значение по умолчанию зависит от размера строки кэша процессора. | |
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200 Подробнее настройка хэш-таблиц обсуждается в отдельном |
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201 <link doc="../hash.xml">документе</link>. |
98 | 202 </para> |
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203 |
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204 </directive> |
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205 |
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206 |
346 | 207 <directive name="map_hash_max_size"> |
208 <syntax><value>размер</value></syntax> | |
209 <default>2048</default> | |
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210 <context>http</context> |
98 | 211 |
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212 <para> |
346 | 213 Задаёт максимальный размер хэш-таблиц для переменных <link id="map"/>. |
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214 Подробнее настройка хэш-таблиц обсуждается в отдельном |
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215 <link doc="../hash.xml">документе</link>. |
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216 </para> |
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217 |
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218 </directive> |
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219 |
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220 </section> |
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221 |
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222 </module> |