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annotate xml/ru/docs/http/ngx_http_memcached_module.xml @ 3090:27532d42102b default tip

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Documented the "rate" parameter of the "error_log" directive.
author Maxim Dounin <mdounin@mdounin.ru>
date Sun, 16 Jun 2024 06:55:30 +0300
parents 53734009b0c3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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="18">
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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_bind">
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52 <syntax>
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53 <value>адрес</value>
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54 [<literal>transparent </literal>] |
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55 <literal>off</literal></syntax>
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56 <default/>
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57 <context>http</context>
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58 <context>server</context>
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59 <context>location</context>
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60 <appeared-in>0.8.22</appeared-in>
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61
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62 <para>
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63 Задаёт локальный IP-адрес с необязательным портом (1.11.2),
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64 который будет использоваться в исходящих соединениях с сервером memcached.
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65 В значении параметра допустимо использование переменных (1.3.12).
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66 Специальное значение <literal>off</literal> (1.3.12) отменяет действие
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67 унаследованной с предыдущего уровня конфигурации
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68 директивы <literal>memcached_bind</literal>, позволяя системе
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69 самостоятельно выбирать локальный IP-адрес и порт.
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70 </para>
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71
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72 <para id="memcached_bind_transparent">
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73 Параметр <literal>transparent</literal> (1.11.0) позволяет
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74 задать нелокальный IP-aдрес, который будет использоваться в
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75 исходящих соединениях с сервером memcached,
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76 например, реальный IP-адрес клиента:
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77 <example>
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78 memcached_bind $remote_addr transparent;
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79 </example>
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80 Для работы параметра
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81 обычно требуется
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82 запустить рабочие процессы nginx с привилегиями
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83 <link doc="../ngx_core_module.xml" id="user">суперпользователя</link>.
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84 В Linux этого не требуется (1.13.8), так как если
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85 указан параметр <literal>transparent</literal>, то рабочие процессы
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86 наследуют capability <literal>CAP_NET_RAW</literal> из главного процесса.
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87 Также необходимо настроить таблицу маршрутизации ядра
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88 для перехвата сетевого трафика с сервера memcached.
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89 </para>
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90
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91 </directive>
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92
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93
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94 <directive name="memcached_buffer_size">
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95 <syntax><value>размер</value></syntax>
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96 <default>4k|8k</default>
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97 <context>http</context>
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98 <context>server</context>
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99 <context>location</context>
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100
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101 <para>
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102 Задаёт <value>размер</value> буфера, в который будет читаться ответ,
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103 получаемый от сервера memcached.
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104 Ответ синхронно передаётся клиенту сразу же по мере его поступления.
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105 </para>
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106
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107 </directive>
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108
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109
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110 <directive name="memcached_connect_timeout">
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111 <syntax><value>время</value></syntax>
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112 <default>60s</default>
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113 <context>http</context>
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114 <context>server</context>
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115 <context>location</context>
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116
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117 <para>
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118 Задаёт таймаут для установления соединения с сервером memcached.
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119 Необходимо иметь в виду, что этот таймаут обычно не может превышать 75 секунд.
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120 </para>
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121
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122 </directive>
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123
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124
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125 <directive name="memcached_gzip_flag">
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126 <syntax><value>флаг</value></syntax>
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127 <default></default>
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128 <context>http</context>
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129 <context>server</context>
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130 <context>location</context>
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131 <appeared-in>1.3.6</appeared-in>
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132
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133 <para>
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134 Включает проверку указанного <value>флага</value> в ответе
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135 сервера memcached и установку поля “<literal>Content-Encoding</literal>”
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136 заголовка ответа в “<literal>gzip</literal>”, если этот флаг установлен.
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137 </para>
08140f6b7964 Documented gunzip module and corresponding changes.
Vladimir Homutov <vl@nginx.com>
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138
08140f6b7964 Documented gunzip module and corresponding changes.
Vladimir Homutov <vl@nginx.com>
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diff changeset
139 </directive>
08140f6b7964 Documented gunzip module and corresponding changes.
Vladimir Homutov <vl@nginx.com>
parents: 589
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140
08140f6b7964 Documented gunzip module and corresponding changes.
Vladimir Homutov <vl@nginx.com>
parents: 589
diff changeset
141
76
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142 <directive name="memcached_next_upstream">
271
4c6d2c614d2c Cleaned up XML tag mess:
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diff changeset
143 <syntax>
364
bb51d3e17dd0 Style fixed.
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diff changeset
144 <literal>error</literal> |
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parents: 361
diff changeset
145 <literal>timeout</literal> |
bb51d3e17dd0 Style fixed.
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parents: 361
diff changeset
146 <literal>invalid_response</literal> |
bb51d3e17dd0 Style fixed.
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parents: 361
diff changeset
147 <literal>not_found</literal> |
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parents: 361
diff changeset
148 <literal>off</literal>
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diff changeset
149 ...</syntax>
102
c76a257f3fd4 The directive name is now automatically printed in <default> and <syntax>.
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diff changeset
150 <default>error timeout</default>
361
1018108c5068 Revision.
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diff changeset
151 <context>http</context>
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parents: 296
diff changeset
152 <context>server</context>
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153 <context>location</context>
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154
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155 <para>
361
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diff changeset
156 Определяет, в каких случаях запрос будет передан следующему серверу:
1018108c5068 Revision.
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diff changeset
157 <list type="tag">
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158
361
1018108c5068 Revision.
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diff changeset
159 <tag-name><literal>error</literal></tag-name>
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160 <tag-desc>произошла ошибка соединения с сервером, передачи ему запроса или
1018108c5068 Revision.
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161 чтения заголовка ответа сервера;</tag-desc>
76
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162
361
1018108c5068 Revision.
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diff changeset
163 <tag-name><literal>timeout</literal></tag-name>
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164 <tag-desc>произошёл таймаут во время соединения с сервером,
1018108c5068 Revision.
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diff changeset
165 передачи ему запроса или чтения заголовка ответа сервера;</tag-desc>
76
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166
361
1018108c5068 Revision.
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diff changeset
167 <tag-name><literal>invalid_response</literal></tag-name>
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168 <tag-desc>сервер вернул пустой или неверный ответ;</tag-desc>
76
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169
361
1018108c5068 Revision.
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diff changeset
170 <tag-name><literal>not_found</literal></tag-name>
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171 <tag-desc>сервер не нашёл ответ;</tag-desc>
76
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172
361
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diff changeset
173 <tag-name><literal>off</literal></tag-name>
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174 <tag-desc>запрещает передачу запроса следующему серверу.</tag-desc>
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175
4a4caa566120 Russian documentation import.
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176 </list>
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177 </para>
4a4caa566120 Russian documentation import.
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178
4a4caa566120 Russian documentation import.
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179 <para>
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180 Необходимо понимать, что передача запроса следующему серверу возможна
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181 только при условии, что клиенту ещё ничего не передавалось.
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182 То есть, если ошибка или таймаут возникли в середине передачи ответа,
4a4caa566120 Russian documentation import.
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183 то исправить это уже невозможно.
4a4caa566120 Russian documentation import.
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184 </para>
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185
942
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186 <para>
1289
57fc39924d42 Proxy/memcached/fastcgi/scgi/uwsgi: updated link in _next_upstream directives.
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187 Директива также определяет, что считается
57fc39924d42 Proxy/memcached/fastcgi/scgi/uwsgi: updated link in _next_upstream directives.
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188 <link doc="ngx_http_upstream_module.xml" id="max_fails">неудачной
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189 попыткой</link> работы с сервером.
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190 Случаи <literal>error</literal>, <literal>timeout</literal> и
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191 <literal>invalid_response</literal>
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192 всегда считаются неудачными попытками, даже если они не указаны в директиве.
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193 Случай <literal>not_found</literal>
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194 никогда не считается неудачной попыткой.
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195 </para>
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196
1290
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197 <para>
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198 Передача запроса следующему серверу может быть ограничена по
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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199 <link id="memcached_next_upstream_tries">количеству попыток</link>
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200 и по <link id="memcached_next_upstream_timeout">времени</link>.
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201 </para>
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202
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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203 </directive>
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204
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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205
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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206 <directive name="memcached_next_upstream_timeout">
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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207 <syntax><value>время</value></syntax>
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208 <default>0</default>
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209 <context>http</context>
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210 <context>server</context>
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211 <context>location</context>
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diff changeset
212 <appeared-in>1.7.5</appeared-in>
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213
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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214 <para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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215 Ограничивает время, в течение которого возможна передача запроса
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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216 <link id="memcached_next_upstream">следующему серверу</link>.
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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217 Значение <literal>0</literal> отключает это ограничение.
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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218 </para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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219
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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220 </directive>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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221
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
222
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
223 <directive name="memcached_next_upstream_tries">
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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224 <syntax><value>число</value></syntax>
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225 <default>0</default>
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226 <context>http</context>
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227 <context>server</context>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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228 <context>location</context>
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229 <appeared-in>1.7.5</appeared-in>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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230
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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231 <para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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232 Ограничивает число допустимых попыток для передачи запроса
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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233 <link id="memcached_next_upstream">следующему серверу</link>.
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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234 Значение <literal>0</literal> отключает это ограничение.
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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235 </para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
236
76
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237 </directive>
4a4caa566120 Russian documentation import.
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parents:
diff changeset
238
4a4caa566120 Russian documentation import.
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parents:
diff changeset
239
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
240 <directive name="memcached_pass">
361
1018108c5068 Revision.
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diff changeset
241 <syntax><value>адрес</value></syntax>
99
1d315ef37215 The case <default/> is now language-agnostic.
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diff changeset
242 <default/>
361
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diff changeset
243 <context>location</context>
1018108c5068 Revision.
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diff changeset
244 <context>if в location</context>
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245
4a4caa566120 Russian documentation import.
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246 <para>
361
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diff changeset
247 Задаёт адрес сервера memcached.
1622
c4c1dddfedac Unified *_pass address descriptions.
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248 Адрес может быть указан в виде доменного имени или IP-адреса,
c4c1dddfedac Unified *_pass address descriptions.
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diff changeset
249 и порта:
76
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diff changeset
250 <example>
361
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diff changeset
251 memcached_pass localhost:11211;
76
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252 </example>
814
f46a132af596 "memcached_pass" can be a UNIX-domain socket.
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diff changeset
253 или в виде пути UNIX-сокета:
f46a132af596 "memcached_pass" can be a UNIX-domain socket.
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254 <example>
f46a132af596 "memcached_pass" can be a UNIX-domain socket.
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diff changeset
255 memcached_pass unix:/tmp/memcached.socket;
f46a132af596 "memcached_pass" can be a UNIX-domain socket.
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diff changeset
256 </example>
76
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257 </para>
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258
4a4caa566120 Russian documentation import.
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259 <para>
361
1018108c5068 Revision.
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260 Если доменному имени соответствует несколько адресов, то все они будут
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261 использоваться по очереди (round-robin).
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262 И, кроме того, адрес может быть
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263 <link doc="ngx_http_upstream_module.xml">группой серверов</link>.
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264 </para>
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265
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266 </directive>
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267
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268
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269 <directive name="memcached_read_timeout">
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270 <syntax><value>время</value></syntax>
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271 <default>60s</default>
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272 <context>http</context>
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273 <context>server</context>
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274 <context>location</context>
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275
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276 <para>
361
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277 Задаёт таймаут при чтении ответа сервера memcached.
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278 Таймаут устанавливается не на всю передачу ответа,
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279 а только между двумя операциями чтения.
361
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280 Если по истечении этого времени сервер memcached ничего не передаст,
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281 соединение закрывается.
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282 </para>
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283
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284 </directive>
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285
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286
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287 <directive name="memcached_send_timeout">
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288 <syntax><value>время</value></syntax>
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289 <default>60s</default>
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290 <context>http</context>
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291 <context>server</context>
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292 <context>location</context>
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293
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294 <para>
361
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295 Задаёт таймаут при передаче запроса серверу memcached.
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296 Таймаут устанавливается не на всю передачу запроса,
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297 а только между двумя операциями записи.
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298 Если по истечении этого времени сервер memcached не примет новых данных,
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299 соединение закрывается.
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300 </para>
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301
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302 </directive>
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303
2254
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304
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305 <directive name="memcached_socket_keepalive">
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306 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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307 <default>off</default>
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308 <context>http</context>
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309 <context>server</context>
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310 <context>location</context>
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311 <appeared-in>1.15.6</appeared-in>
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312
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313 <para>
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314 Конфигурирует поведение “TCP keepalive”
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315 для исходящих соединений к серверу memcached.
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316 По умолчанию для сокета действуют настройки операционной системы.
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317 Если указано значение “<literal>on</literal>”, то
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318 для сокета включается параметр <c-def>SO_KEEPALIVE</c-def>.
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319 </para>
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320
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321 </directive>
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322
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323 </section>
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324
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325
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326 <section id="variables" name="Встроенные переменные">
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327
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328 <para>
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329 <list type="tag">
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330
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331 <tag-name id="var_memcached_key"><var>$memcached_key</var></tag-name>
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332 <tag-desc>
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333 Задаёт ключ для получения ответа из сервера memcached.
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334 </tag-desc>
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335
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336 </list>
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337 </para>
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338
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339 </section>
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340
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341 </module>