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annotate xml/ru/docs/http/ngx_http_v2_module.xml @ 2654:d13341d3c54a

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Marked some directives as obsolete in HTTP/2. The following directives are marked as obsolete: http2_idle_timeout, http2_max_field_size, http2_max_header_size, http2_max_requests, http2_recv_timeout.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 16 Feb 2021 14:17:10 +0000
parents 4f3494d80949
children b74f2038f2b5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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beab8345acf6 Translated the http/2 module into Russian.
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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) Nginx, Inc.
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5 -->
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6
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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8
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9 <module name="Модуль ngx_http_v2_module"
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10 link="/ru/docs/http/ngx_http_v2_module.html"
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11 lang="ru"
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12 rev="14">
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13
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14 <section id="summary">
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15
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16 <para>
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17 Модуль <literal>ngx_http_v2_module</literal> (1.9.5) обеспечивает
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18 поддержку <link url="https://tools.ietf.org/html/rfc7540">HTTP/2</link>
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19 и заменяет
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20 модуль <link doc="ngx_http_spdy_module.xml">ngx_http_spdy_module</link>.
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21 </para>
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22
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23 <para>
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24 По умолчанию этот модуль не собирается, его сборку необходимо разрешить
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25 с помощью конфигурационного параметра
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26 <literal>--with-http_v2_module</literal>.
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27 </para>
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28
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29 </section>
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30
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31
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32 <section id="issues" name="Известные проблемы">
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33
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34 <para>
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35 До версии 1.9.14
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36 буферизация тела запроса клиента не могла быть запрещена
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37 независимо от
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38 значения директив
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39 <link doc="ngx_http_proxy_module.xml" id="proxy_request_buffering"/>,
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40 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_request_buffering"/>,
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41 <link doc="ngx_http_uwsgi_module.xml" id="uwsgi_request_buffering"/> и
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42 <link doc="ngx_http_scgi_module.xml" id="scgi_request_buffering"/>.
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43 </para>
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44
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45 <para>
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46 До версии 1.19.1
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47 механизм <link doc="ngx_http_core_module.xml" id="lingering_close"/>
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48 не использовался в управлении закрытием HTTP/2-соединений.
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49 </para>
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50
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51 </section>
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52
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53
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54 <section id="example" name="Пример конфигурации">
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55
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56 <para>
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57 <example>
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58 server {
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59 listen 443 ssl http2;
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60
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61 ssl_certificate server.crt;
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62 ssl_certificate_key server.key;
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63 }
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64 </example>
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65 Чтобы принимать HTTP/2-соединения по TLS, необходимо
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66 наличие поддержки расширения “Application-Layer Protocol Negotiation” (ALPN)
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67 протокола TLS, появившейся лишь в
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68 <link url="http://www.openssl.org">OpenSSL</link> версии 1.0.2.
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69 Работа расширения “Next Protocol Negotiation” (NPN) протокола TLS
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70 (поддерживаемого начиная с OpenSSL версии 1.0.1) в данном случае не гарантируется.
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71 </para>
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72
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73 <para>
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74 Если
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75 директива <link doc="ngx_http_ssl_module.xml" id="ssl_prefer_server_ciphers"/>
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76 установлена в значение “<literal>on</literal>”,
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77 <link doc="ngx_http_ssl_module.xml" id="ssl_ciphers">шифры</link>
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78 должны быть настроены таким образом, чтобы соответствовать чёрному списку
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79 <link url="https://tools.ietf.org/html/rfc7540#appendix-A">RFC 7540, Appendix A</link>,
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80 а также поддерживаться клиентами.
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81 </para>
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82
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83 </section>
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84
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85
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86 <section id="directives" name="Директивы">
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87
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88 <directive name="http2_body_preread_size">
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89 <syntax><value>размер</value></syntax>
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90 <default>64k</default>
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91 <context>http</context>
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92 <context>server</context>
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93 <appeared-in>1.11.0</appeared-in>
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94
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95 <para>
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96 Задаёт <value>размер</value> буфера для каждого запроса,
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97 в который может сохраняться тело запроса
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98 до того, как оно начнёт обрабатываться.
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99 </para>
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100
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101 </directive>
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102
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103
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104 <directive name="http2_chunk_size">
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105 <syntax><value>размер</value></syntax>
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106 <default>8k</default>
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107 <context>http</context>
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108 <context>server</context>
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109 <context>location</context>
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110
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111 <para>
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112 Задаёт максимальный размер частей,
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113 на которое будет разделяться тело ответа.
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114 Слишком маленькое значение может привести к росту накладных расходов.
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115 Слишком большое значение может негативно сказаться на приоритизации из-за
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116 <link url="http://en.wikipedia.org/wiki/Head-of-line_blocking">
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117 блокировки очереди</link>.
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118 </para>
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119
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120 </directive>
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121
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122
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123 <directive name="http2_idle_timeout">
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124 <syntax><value>время</value></syntax>
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125 <default>3m</default>
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126 <context>http</context>
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127 <context>server</context>
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128
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129 <para>
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130 <note>
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131 Эта директива устарела начиная с версии 1.19.7.
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132 Вместо неё следует использовать директиву
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133 <link doc="ngx_http_core_module.xml" id="keepalive_timeout"/>.
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134 </note>
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135 </para>
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136
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137 <para>
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138 Задаёт таймаут неактивности, после которого соединение закрывается.
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139 </para>
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140
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141 </directive>
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142
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143
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144 <directive name="http2_max_concurrent_pushes">
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145 <syntax><value>число</value></syntax>
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146 <default>10</default>
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147 <context>http</context>
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148 <context>server</context>
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149 <appeared-in>1.13.9</appeared-in>
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150
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151 <para>
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152 Ограничивает максимальное число параллельных
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153 <link id="http2_push">push</link>-запросов в соединении.
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154 </para>
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155
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156 </directive>
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157
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158
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159 <directive name="http2_max_concurrent_streams">
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160 <syntax><value>число</value></syntax>
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161 <default>128</default>
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162 <context>http</context>
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163 <context>server</context>
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164
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165 <para>
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166 Задаёт максимальное число параллельных HTTP/2-потоков
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167 в соединении.
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168 </para>
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169
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170 </directive>
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171
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172
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173 <directive name="http2_max_field_size">
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174 <syntax><value>размер</value></syntax>
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175 <default>4k</default>
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176 <context>http</context>
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177 <context>server</context>
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178
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179 <para>
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180 <note>
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181 Эта директива устарела начиная с версии 1.19.7.
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182 Вместо неё следует использовать директиву
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183 <link doc="ngx_http_core_module.xml" id="large_client_header_buffers"/>.
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184 </note>
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185 </para>
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186
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187 <para>
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188 Ограничивает максимальный размер
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189 заголовка запроса, сжатого при помощи
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190 <link url="https://tools.ietf.org/html/rfc7541">HPACK</link>.
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191 Ограничение применяется в равной степени как к имени, так и к значению.
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192 Если применяется кодирование Хаффмана,
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193 то фактический размер распакованных строк имени и значения может быть больше.
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194 Ограничение по умолчанию подходит для большинства запросов.
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195 </para>
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196
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197 </directive>
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198
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199
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200 <directive name="http2_max_header_size">
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201 <syntax><value>размер</value></syntax>
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202 <default>16k</default>
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203 <context>http</context>
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204 <context>server</context>
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205
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206 <para>
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207 <note>
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208 Эта директива устарела начиная с версии 1.19.7.
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209 Вместо неё следует использовать директиву
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210 <link doc="ngx_http_core_module.xml" id="large_client_header_buffers"/>.
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211 </note>
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212 </para>
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213
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214 <para>
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215 Ограничивает максимальный размер всего списка заголовков запроса после
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216 распаковки <link url="https://tools.ietf.org/html/rfc7541">HPACK</link>.
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217 Ограничение по умолчанию подходит для большинства запросов.
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218 </para>
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219
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220 </directive>
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221
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222
1834
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223 <directive name="http2_max_requests">
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224 <syntax><value>число</value></syntax>
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225 <default>1000</default>
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226 <context>http</context>
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227 <context>server</context>
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228 <appeared-in>1.11.6</appeared-in>
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229
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230 <para>
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231 <note>
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232 Эта директива устарела начиная с версии 1.19.7.
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233 Вместо неё следует использовать директиву
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234 <link doc="ngx_http_core_module.xml" id="keepalive_requests"/>.
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235 </note>
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236 </para>
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237
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238 <para>
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239 Задаёт максимальное число запросов (включая
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240 <link id="http2_push">push</link>-запросы), которые можно
1834
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241 сделать по одному соединению HTTP/2,
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242 после чего очередной клиентский запрос приведёт к закрытию соединения
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243 и необходимости установить новое соединение.
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244 </para>
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245
2450
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246 <para>
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247 Периодическое закрытие соединений необходимо для освобождения
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248 памяти, выделенной под конкретные соединения.
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249 Поэтому использование слишком большого максимального числа запросов
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250 может приводить к чрезмерному потреблению памяти и не рекомендуется.
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251 </para>
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252
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253 </directive>
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254
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255
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256 <directive name="http2_push">
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257 <syntax><value>uri</value> | <literal>off</literal></syntax>
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258 <default>off</default>
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259 <context>http</context>
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260 <context>server</context>
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261 <context>location</context>
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262 <appeared-in>1.13.9</appeared-in>
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263
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264 <para>
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265 Заблаговременно отправляет
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266 (<link url="https://tools.ietf.org/html/rfc7540#section-8.2">push</link>) запрос
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267 к заданному <value>uri</value>
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268 вместе с ответом на оригинальный запрос.
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269 Будут обработаны только относительные URI с абсолютными путями,
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270 например:
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271 <example>
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272 http2_push /static/css/main.css;
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273 </example>
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274 В значении <value>uri</value> допустимо использование переменных.
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275 </para>
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276
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277 <para>
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278 На одном уровне конфигурации можно указать несколько
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279 <literal>http2_push</literal> директив.
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280 Параметр <literal>off</literal> отменяет действие
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281 унаследованных с предыдущего уровня конфигурации
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282 директив <literal>http2_push</literal>.
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283 </para>
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284
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285 </directive>
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286
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287
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288 <directive name="http2_push_preload">
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289 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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290 <default>off</default>
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291 <context>http</context>
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292 <context>server</context>
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293 <context>location</context>
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294 <appeared-in>1.13.9</appeared-in>
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295
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296 <para>
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297 Разрешает автоматическое преобразование
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298 <link url="https://www.w3.org/TR/preload/#server-push-http-2">preload
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299 links</link>,
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300 указанных в полях <header>Link</header> заголовка ответа, в
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301 <link url="https://tools.ietf.org/html/rfc7540#section-8.2">push</link>-запросы.
1834
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302 </para>
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303
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304 </directive>
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305
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306
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307 <directive name="http2_recv_buffer_size">
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308 <syntax><value>размер</value></syntax>
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309 <default>256k</default>
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310 <context>http</context>
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311
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312 <para>
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313 Задаёт размер входного буфера для
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314 <link doc="../ngx_core_module.xml" id="worker_processes">рабочего
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315 процесса</link>.
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316 </para>
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317
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318 </directive>
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319
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320
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321 <directive name="http2_recv_timeout">
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322 <syntax><value>время</value></syntax>
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323 <default>30s</default>
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324 <context>http</context>
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325 <context>server</context>
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326
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327 <para>
2654
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328 <note>
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329 Эта директива устарела начиная с версии 1.19.7.
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330 Вместо неё следует использовать директиву
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331 <link doc="ngx_http_core_module.xml" id="client_header_timeout"/>.
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332 </note>
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333 </para>
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334
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335 <para>
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336 Задаёт таймаут в случае, когда от клиента ожидаются ещё данные,
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337 после которого соединение закрывается.
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338 </para>
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339
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340 </directive>
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341
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342 </section>
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343
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344
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345 <section id="variables" name="Встроенные переменные">
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346
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347 <para>
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348 Модуль <literal>ngx_http_v2_module</literal>
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349 поддерживает следующие встроенные переменные:
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350 <list type="tag" compact="no">
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351
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352 <tag-name id="var_http2"><var>$http2</var></tag-name>
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353 <tag-desc>
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354 согласованный идентификатор протокола:
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355 “<literal>h2</literal>” для HTTP/2 через TLS,
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356 “<literal>h2c</literal>” для HTTP/2 через незашифрованный TCP,
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357 либо пустая строка.
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358 </tag-desc>
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359
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360 </list>
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361 </para>
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362
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363 </section>
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364
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365 </module>