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annotate xml/en/docs/http/ngx_http_v2_module.xml @ 1666:08f48ecb13ba

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Added a hyperlink to http2_recv_buffer_size.
author Yaroslav Zhuravlev <yar@nginx.com>
date Mon, 28 Mar 2016 16:20:01 +0300
parents 680cbf783efe
children 5154b356a1b2
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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="Module ngx_http_v2_module"
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10 link="/en/docs/http/ngx_http_v2_module.html"
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11 lang="en"
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12 rev="5">
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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 The <literal>ngx_http_v2_module</literal> module (1.9.5) provides
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18 support for <link url="https://tools.ietf.org/html/rfc7540">HTTP/2</link>
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19 and supersedes the
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20 <link doc="ngx_http_spdy_module.xml">ngx_http_spdy_module</link> module.
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21 </para>
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22
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23 <para>
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24 This module is not built by default, it should be enabled with
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25 the <literal>--with-http_v2_module</literal>
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26 configuration parameter.
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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="Known Issues">
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33
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34 <para>
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35 The module is experimental, caveat emptor applies.
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36 </para>
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37
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38 <para>
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39 Buffering of a client request body cannot be disabled
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40 regardless of
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41 <link doc="ngx_http_proxy_module.xml" id="proxy_request_buffering"/>,
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42 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_request_buffering"/>,
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43 <link doc="ngx_http_uwsgi_module.xml" id="uwsgi_request_buffering"/>, and
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44 <link doc="ngx_http_scgi_module.xml" id="scgi_request_buffering"/>
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45 directive values.
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46 </para>
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47
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48 </section>
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49
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50
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51 <section id="example" name="Example Configuration">
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52
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53 <para>
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54 <example>
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55 server {
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56 listen 443 ssl http2;
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57
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58 ssl_certificate server.crt;
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59 ssl_certificate_key server.key;
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60 }
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61 </example>
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62 Note that accepting HTTP/2 connections over TLS requires
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63 the “Application-Layer Protocol Negotiation” (ALPN) TLS extension
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64 support, which is available only since
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65 <link url="http://www.openssl.org">OpenSSL</link> version 1.0.2.
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66 Using the “Next Protocol Negotiation” (NPN) TLS extension for this purpose
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67 (available since OpenSSL version 1.0.1) is not guaranteed.
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68 </para>
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69
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70 <para>
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71 Also note that if the
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72 <link doc="ngx_http_ssl_module.xml" id="ssl_prefer_server_ciphers"/> directive
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73 is set to the value “<literal>on</literal>”,
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74 the <link doc="ngx_http_ssl_module.xml" id="ssl_ciphers">ciphers</link>
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75 should be configured to comply with
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76 <link url="https://tools.ietf.org/html/rfc7540#appendix-A">RFC 7540, Appendix A</link>
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77 black list and supported by clients.
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78 </para>
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79
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80 </section>
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81
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82
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83 <section id="directives" name="Directives">
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84
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85 <directive name="http2_chunk_size">
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86 <syntax><value>size</value></syntax>
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87 <default>8k</default>
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88 <context>http</context>
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89 <context>server</context>
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90 <context>location</context>
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91
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92 <para>
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93 Sets the maximum size of chunks
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94 into which the response body is sliced.
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95 A too low value results in higher overhead.
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96 A too high value impairs prioritization due to
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97 <link url="http://en.wikipedia.org/wiki/Head-of-line_blocking">
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98 HOL blocking</link>.
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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_idle_timeout">
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105 <syntax><value>time</value></syntax>
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106 <default>3m</default>
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107 <context>http</context>
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108 <context>server</context>
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109
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110 <para>
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111 Sets the timeout of inactivity after which the connection is closed.
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112 </para>
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113
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114 </directive>
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115
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116
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117 <directive name="http2_max_concurrent_streams">
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118 <syntax><value>number</value></syntax>
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119 <default>128</default>
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120 <context>http</context>
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121 <context>server</context>
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122
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123 <para>
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124 Sets the maximum number of concurrent HTTP/2 streams
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125 in a connection.
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126 </para>
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127
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128 </directive>
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129
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130
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131 <directive name="http2_max_field_size">
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132 <syntax><value>size</value></syntax>
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133 <default>4k</default>
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134 <context>http</context>
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135 <context>server</context>
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136
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137 <para>
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138 Limits the maximum size of
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139 an <link url="http://tools.ietf.org/html/rfc7541">HPACK</link>-compressed
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140 request header field.
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141 The limit applies equally to both name and value.
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142 Note that if Huffman encoding is applied,
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143 the actual size of decompressed name and value strings may be larger.
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144 For most requests, the default limit should be enough.
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145 </para>
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146
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147 </directive>
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148
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149
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150 <directive name="http2_max_header_size">
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151 <syntax><value>size</value></syntax>
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152 <default>16k</default>
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153 <context>http</context>
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154 <context>server</context>
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155
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156 <para>
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157 Limits the maximum size of the entire request header list after
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158 <link url="http://tools.ietf.org/html/rfc7541">HPACK</link> decompression.
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159 For most requests, the default limit should be enough.
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160 </para>
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161
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162 </directive>
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163
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164
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165 <directive name="http2_recv_buffer_size">
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166 <syntax><value>size</value></syntax>
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167 <default>256k</default>
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168 <context>http</context>
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169
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170 <para>
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171 Sets the size of the per
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172 <link doc="../ngx_core_module.xml" id="worker_processes">worker</link>
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173 input buffer.
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174 </para>
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175
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176 </directive>
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177
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178
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179 <directive name="http2_recv_timeout">
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180 <syntax><value>time</value></syntax>
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181 <default>30s</default>
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182 <context>http</context>
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183 <context>server</context>
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184
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185 <para>
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186 Sets the timeout for expecting more data from the client,
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187 after which the connection is closed.
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188 </para>
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189
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190 </directive>
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191
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192 </section>
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193
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194
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195 <section id="variables" name="Embedded Variables">
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196
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197 <para>
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198 The <literal>ngx_http_v2_module</literal> module
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199 supports the following embedded variables:
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200 <list type="tag" compact="no">
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201
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202 <tag-name id="var_http2"><var>$http2</var></tag-name>
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203 <tag-desc>
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204 negotiated protocol identifier:
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205 “<literal>h2</literal>” for HTTP/2 over TLS,
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206 “<literal>h2c</literal>” for HTTP/2 over cleartext TCP,
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207 or an empty string otherwise.
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208 </tag-desc>
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209
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210 </list>
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211 </para>
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212
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213 </section>
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214
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215 </module>