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annotate xml/ru/docs/http/ngx_http_memcached_module.xml @ 675:08140f6b7964

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Documented gunzip module and corresponding changes.
author Vladimir Homutov <vl@nginx.com>
date Wed, 12 Sep 2012 09:35:47 +0000
parents 764fbac1b8b4
children 934fd358c944
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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="Модуль ngx_http_memcached_module"
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11 link="/ru/docs/http/ngx_http_memcached_module.html"
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12 lang="ru"
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13 rev="1">
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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 Модуль <literal>ngx_http_memcached_module</literal> позволяет получать
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19 ответ из сервера memcached.
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20 Ключ задаётся в переменной <var>$memcached_key</var>.
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21 Ответ в memcached должен быть предварительно помещён внешним по отношению
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22 к nginx’у способом.
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23 </para>
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24
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25 </section>
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26
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27
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28 <section id="example" name="Пример конфигурации">
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29
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30 <para>
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31 <example>
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32 server {
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33 location / {
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34 set $memcached_key "$uri?$args";
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35 memcached_pass host:11211;
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36 error_page 404 502 504 = @fallback;
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37 }
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38
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39 location @fallback {
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40 proxy_pass http://backend;
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41 }
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42 }
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43 </example>
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44 </para>
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45
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46 </section>
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47
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48
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49 <section id="directives" name="Директивы">
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50
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51 <directive name="memcached_buffer_size">
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52 <syntax><value>размер</value></syntax>
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53 <default>4k|8k</default>
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54 <context>http</context>
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55 <context>server</context>
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56 <context>location</context>
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57
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58 <para>
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59 Задаёт <value>размер</value> буфера, в который будет читаться ответ,
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60 получаемый от сервера memcached.
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61 Ответ синхронно передаётся клиенту сразу же по мере его поступления.
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62 </para>
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63
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64 </directive>
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66
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67 <directive name="memcached_connect_timeout">
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68 <syntax><value>время</value></syntax>
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69 <default>60s</default>
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70 <context>http</context>
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71 <context>server</context>
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72 <context>location</context>
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74 <para>
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75 Задаёт таймаут для установления соединения с сервером memcached.
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76 Необходимо иметь в виду, что этот таймаут обычно не может превышать 75 секунд.
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77 </para>
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78
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79 </directive>
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82 <directive name="memcached_gzip_flag">
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83 <syntax><value>флаг</value></syntax>
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84 <default></default>
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85 <context>http</context>
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86 <context>server</context>
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87 <context>location</context>
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88 <appeared-in>1.3.6</appeared-in>
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89
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90 <para>
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91 Включает проверку указанного <value>флага</value> в ответе
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92 сервера memcached и установку поля “<literal>Content-Encoding</literal>”
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93 заголовка ответа в “<literal>gzip</literal>”, если этот флаг установлен.
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94 </para>
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95
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96 </directive>
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97
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98
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99 <directive name="memcached_next_upstream">
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100 <syntax>
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101 <literal>error</literal> |
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102 <literal>timeout</literal> |
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103 <literal>invalid_response</literal> |
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104 <literal>not_found</literal> |
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105 <literal>off</literal>
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106 ...</syntax>
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107 <default>error timeout</default>
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108 <context>http</context>
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109 <context>server</context>
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110 <context>location</context>
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111
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112 <para>
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113 Определяет, в каких случаях запрос будет передан следующему серверу:
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114 <list type="tag">
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115
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116 <tag-name><literal>error</literal></tag-name>
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117 <tag-desc>произошла ошибка соединения с сервером, передачи ему запроса или
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118 чтения заголовка ответа сервера;</tag-desc>
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119
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120 <tag-name><literal>timeout</literal></tag-name>
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121 <tag-desc>произошёл таймаут во время соединения с сервером,
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122 передачи ему запроса или чтения заголовка ответа сервера;</tag-desc>
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123
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124 <tag-name><literal>invalid_response</literal></tag-name>
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125 <tag-desc>сервер вернул пустой или неверный ответ;</tag-desc>
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126
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127 <tag-name><literal>not_found</literal></tag-name>
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128 <tag-desc>сервер не нашёл ответ;</tag-desc>
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129
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130 <tag-name><literal>off</literal></tag-name>
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131 <tag-desc>запрещает передачу запроса следующему серверу.</tag-desc>
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132
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133 </list>
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134 </para>
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135
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136 <para>
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137 Необходимо понимать, что передача запроса следующему серверу возможна
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138 только при условии, что клиенту ещё ничего не передавалось.
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139 То есть, если ошибка или таймаут возникли в середине передачи ответа,
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140 то исправить это уже невозможно.
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141 </para>
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142
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143 </directive>
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144
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145
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146 <directive name="memcached_pass">
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147 <syntax><value>адрес</value></syntax>
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148 <default/>
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149 <context>location</context>
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150 <context>if в location</context>
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151
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152 <para>
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153 Задаёт адрес сервера memcached.
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154 Адрес может быть указан в виде доменного имени или адреса, и порта, например,
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155 <example>
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156 memcached_pass localhost:11211;
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157 </example>
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158 </para>
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159
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160 <para>
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161 Если доменному имени соответствует несколько адресов, то все они будут
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162 использоваться по очереди (round-robin).
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163 И, кроме того, адрес может быть
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164 <link doc="ngx_http_upstream_module.xml">группой серверов</link>.
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165 </para>
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166
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167 </directive>
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168
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169
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170 <directive name="memcached_read_timeout">
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171 <syntax><value>время</value></syntax>
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172 <default>60s</default>
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173 <context>http</context>
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174 <context>server</context>
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175 <context>location</context>
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176
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177 <para>
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178 Задаёт таймаут при чтении ответа сервера memcached.
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179 Таймаут устанавливается не на всю передачу ответа,
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180 а только между двумя операциями чтения.
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181 Если по истечении этого времени сервер memcached ничего не передаст,
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182 соединение закрывается.
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183 </para>
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184
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185 </directive>
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186
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187
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188 <directive name="memcached_send_timeout">
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189 <syntax><value>время</value></syntax>
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190 <default>60s</default>
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191 <context>http</context>
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192 <context>server</context>
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193 <context>location</context>
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194
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195 <para>
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196 Задаёт таймаут при передаче запроса серверу memcached.
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197 Таймаут устанавливается не на всю передачу запроса,
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198 а только между двумя операциями записи.
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199 Если по истечении этого времени сервер memcached не примет новых данных,
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200 соединение закрывается.
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201 </para>
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202
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203 </directive>
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204
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205 </section>
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206
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207 </module>