Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_v2_module.xml @ 1926:88228d493640
A note about the module experimental status removed.
| author | Maxim Konovalov <maxim@nginx.com> |
|---|---|
| date | Thu, 09 Mar 2017 14:00:31 +0000 |
| parents | 66a30a380fba |
| children | ffb3570c352c |
| rev | line source |
|---|---|
| 1566 | 1 <?xml version="1.0"?> |
| 2 | |
| 3 <!-- | |
| 4 Copyright (C) Nginx, Inc. | |
| 5 --> | |
| 6 | |
| 7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> | |
| 8 | |
| 9 <module name="Module ngx_http_v2_module" | |
| 10 link="/en/docs/http/ngx_http_v2_module.html" | |
| 11 lang="en" | |
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12 rev="9"> |
| 1566 | 13 |
| 14 <section id="summary"> | |
| 15 | |
| 16 <para> | |
| 17 The <literal>ngx_http_v2_module</literal> module (1.9.5) provides | |
| 18 support for <link url="https://tools.ietf.org/html/rfc7540">HTTP/2</link> | |
| 19 and supersedes the | |
| 20 <link doc="ngx_http_spdy_module.xml">ngx_http_spdy_module</link> module. | |
| 21 </para> | |
| 22 | |
| 23 <para> | |
| 24 This module is not built by default, it should be enabled with | |
| 25 the <literal>--with-http_v2_module</literal> | |
| 26 configuration parameter. | |
| 27 </para> | |
| 28 | |
| 29 </section> | |
| 30 | |
| 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 Before version 1.9.14, |
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36 buffering of a client request body could not be disabled |
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37 regardless of |
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38 <link doc="ngx_http_proxy_module.xml" id="proxy_request_buffering"/>, |
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39 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_request_buffering"/>, |
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40 <link doc="ngx_http_uwsgi_module.xml" id="uwsgi_request_buffering"/>, and |
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41 <link doc="ngx_http_scgi_module.xml" id="scgi_request_buffering"/> |
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42 directive values. |
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43 </para> |
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44 |
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45 </section> |
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46 |
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47 |
| 1566 | 48 <section id="example" name="Example Configuration"> |
| 49 | |
| 50 <para> | |
| 51 <example> | |
| 52 server { | |
| 53 listen 443 ssl http2; | |
| 54 | |
| 55 ssl_certificate server.crt; | |
| 56 ssl_certificate_key server.key; | |
| 57 } | |
| 58 </example> | |
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59 Note that accepting HTTP/2 connections over TLS requires |
| 1566 | 60 the “Application-Layer Protocol Negotiation” (ALPN) TLS extension |
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61 support, which is available only since |
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62 <link url="http://www.openssl.org">OpenSSL</link> version 1.0.2. |
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63 Using the “Next Protocol Negotiation” (NPN) TLS extension for this purpose |
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64 (available since OpenSSL version 1.0.1) is not guaranteed to work. |
| 1566 | 65 </para> |
| 66 | |
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67 <para> |
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68 Also note that if the |
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69 <link doc="ngx_http_ssl_module.xml" id="ssl_prefer_server_ciphers"/> directive |
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70 is set to the value “<literal>on</literal>”, |
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71 the <link doc="ngx_http_ssl_module.xml" id="ssl_ciphers">ciphers</link> |
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72 should be configured to comply with |
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73 <link url="https://tools.ietf.org/html/rfc7540#appendix-A">RFC 7540, Appendix A</link> |
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74 black list and supported by clients. |
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75 </para> |
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76 |
| 1566 | 77 </section> |
| 78 | |
| 79 | |
| 80 <section id="directives" name="Directives"> | |
| 81 | |
| 82 <directive name="http2_chunk_size"> | |
| 83 <syntax><value>size</value></syntax> | |
| 84 <default>8k</default> | |
| 85 <context>http</context> | |
| 86 <context>server</context> | |
| 87 <context>location</context> | |
| 88 | |
| 89 <para> | |
| 90 Sets the maximum size of chunks | |
| 91 into which the response body is sliced. | |
| 92 A too low value results in higher overhead. | |
| 93 A too high value impairs prioritization due to | |
| 94 <link url="http://en.wikipedia.org/wiki/Head-of-line_blocking"> | |
| 95 HOL blocking</link>. | |
| 96 </para> | |
| 97 | |
| 98 </directive> | |
| 99 | |
| 100 | |
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101 <directive name="http2_body_preread_size"> |
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102 <syntax><value>size</value></syntax> |
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103 <default>64k</default> |
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104 <context>http</context> |
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105 <context>server</context> |
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106 <appeared-in>1.11.0</appeared-in> |
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107 |
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108 <para> |
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109 Sets the <value>size</value> of the buffer per each request |
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110 in which the request body may be saved |
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111 before it is started to be processed. |
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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 |
| 1566 | 117 <directive name="http2_idle_timeout"> |
| 118 <syntax><value>time</value></syntax> | |
| 119 <default>3m</default> | |
| 120 <context>http</context> | |
| 121 <context>server</context> | |
| 122 | |
| 123 <para> | |
| 124 Sets the timeout of inactivity after which the connection is closed. | |
| 125 </para> | |
| 126 | |
| 127 </directive> | |
| 128 | |
| 129 | |
| 130 <directive name="http2_max_concurrent_streams"> | |
| 131 <syntax><value>number</value></syntax> | |
| 132 <default>128</default> | |
| 133 <context>http</context> | |
| 134 <context>server</context> | |
| 135 | |
| 136 <para> | |
| 137 Sets the maximum number of concurrent HTTP/2 streams | |
| 138 in a connection. | |
| 139 </para> | |
| 140 | |
| 141 </directive> | |
| 142 | |
| 143 | |
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144 <directive name="http2_max_field_size"> |
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145 <syntax><value>size</value></syntax> |
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146 <default>4k</default> |
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147 <context>http</context> |
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148 <context>server</context> |
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149 |
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150 <para> |
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151 Limits the maximum size of |
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152 an <link url="https://tools.ietf.org/html/rfc7541">HPACK</link>-compressed |
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153 request header field. |
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154 The limit applies equally to both name and value. |
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155 Note that if Huffman encoding is applied, |
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156 the actual size of decompressed name and value strings may be larger. |
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157 For most requests, the default limit should be enough. |
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158 </para> |
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159 |
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160 </directive> |
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161 |
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162 |
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163 <directive name="http2_max_header_size"> |
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164 <syntax><value>size</value></syntax> |
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165 <default>16k</default> |
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166 <context>http</context> |
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167 <context>server</context> |
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168 |
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169 <para> |
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170 Limits the maximum size of the entire request header list after |
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171 <link url="https://tools.ietf.org/html/rfc7541">HPACK</link> decompression. |
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172 For most requests, the default limit should be enough. |
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173 </para> |
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174 |
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175 </directive> |
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176 |
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177 |
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178 <directive name="http2_max_requests"> |
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179 <syntax><value>number</value></syntax> |
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180 <default>1000</default> |
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181 <context>http</context> |
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182 <context>server</context> |
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183 <context>location</context> |
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184 <appeared-in>1.11.6</appeared-in> |
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185 |
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186 <para> |
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187 Sets the maximum number of requests that can be |
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188 served through one HTTP/2 connection, |
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189 after which the connection is closed |
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190 and the client should use a new connection. |
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191 </para> |
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192 |
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193 </directive> |
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194 |
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195 |
| 1566 | 196 <directive name="http2_recv_buffer_size"> |
| 197 <syntax><value>size</value></syntax> | |
| 198 <default>256k</default> | |
| 199 <context>http</context> | |
| 200 | |
| 201 <para> | |
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202 Sets the size of the per |
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203 <link doc="../ngx_core_module.xml" id="worker_processes">worker</link> |
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204 input buffer. |
| 1566 | 205 </para> |
| 206 | |
| 207 </directive> | |
| 208 | |
| 209 | |
| 210 <directive name="http2_recv_timeout"> | |
| 211 <syntax><value>time</value></syntax> | |
| 212 <default>30s</default> | |
| 213 <context>http</context> | |
| 214 <context>server</context> | |
| 215 | |
| 216 <para> | |
| 217 Sets the timeout for expecting more data from the client, | |
| 218 after which the connection is closed. | |
| 219 </para> | |
| 220 | |
| 221 </directive> | |
| 222 | |
| 223 </section> | |
| 224 | |
| 225 | |
| 226 <section id="variables" name="Embedded Variables"> | |
| 227 | |
| 228 <para> | |
| 229 The <literal>ngx_http_v2_module</literal> module | |
| 230 supports the following embedded variables: | |
| 231 <list type="tag" compact="no"> | |
| 232 | |
| 233 <tag-name id="var_http2"><var>$http2</var></tag-name> | |
| 234 <tag-desc> | |
| 235 negotiated protocol identifier: | |
| 236 “<literal>h2</literal>” for HTTP/2 over TLS, | |
| 237 “<literal>h2c</literal>” for HTTP/2 over cleartext TCP, | |
| 238 or an empty string otherwise. | |
| 239 </tag-desc> | |
| 240 | |
| 241 </list> | |
| 242 </para> | |
| 243 | |
| 244 </section> | |
| 245 | |
| 246 </module> |