Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_v2_module.xml @ 1878:127ae107e5a9
Removed clause about shared memory and Windows versions with ASLR.
Starting with nginx 1.9.0 shared memory can be used on Windows versions
with address space layout randomization.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 26 Dec 2016 19:38:06 +0300 |
| parents | 0ba8d161c354 |
| children | 66a30a380fba |
| 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="8"> |
| 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 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 Before version 1.9.14, |
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40 buffering of a client request body could not be disabled |
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41 regardless of |
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42 <link doc="ngx_http_proxy_module.xml" id="proxy_request_buffering"/>, |
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43 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_request_buffering"/>, |
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44 <link doc="ngx_http_uwsgi_module.xml" id="uwsgi_request_buffering"/>, and |
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45 <link doc="ngx_http_scgi_module.xml" id="scgi_request_buffering"/> |
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46 directive values. |
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47 </para> |
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48 |
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49 </section> |
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50 |
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51 |
| 1566 | 52 <section id="example" name="Example Configuration"> |
| 53 | |
| 54 <para> | |
| 55 <example> | |
| 56 server { | |
| 57 listen 443 ssl http2; | |
| 58 | |
| 59 ssl_certificate server.crt; | |
| 60 ssl_certificate_key server.key; | |
| 61 } | |
| 62 </example> | |
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63 Note that accepting HTTP/2 connections over TLS requires |
| 1566 | 64 the “Application-Layer Protocol Negotiation” (ALPN) TLS extension |
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65 support, which is available only since |
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66 <link url="http://www.openssl.org">OpenSSL</link> version 1.0.2. |
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67 Using the “Next Protocol Negotiation” (NPN) TLS extension for this purpose |
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68 (available since OpenSSL version 1.0.1) is not guaranteed to work. |
| 1566 | 69 </para> |
| 70 | |
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71 <para> |
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72 Also note that if the |
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73 <link doc="ngx_http_ssl_module.xml" id="ssl_prefer_server_ciphers"/> directive |
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74 is set to the value “<literal>on</literal>”, |
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75 the <link doc="ngx_http_ssl_module.xml" id="ssl_ciphers">ciphers</link> |
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76 should be configured to comply with |
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77 <link url="https://tools.ietf.org/html/rfc7540#appendix-A">RFC 7540, Appendix A</link> |
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78 black list and supported by clients. |
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79 </para> |
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80 |
| 1566 | 81 </section> |
| 82 | |
| 83 | |
| 84 <section id="directives" name="Directives"> | |
| 85 | |
| 86 <directive name="http2_chunk_size"> | |
| 87 <syntax><value>size</value></syntax> | |
| 88 <default>8k</default> | |
| 89 <context>http</context> | |
| 90 <context>server</context> | |
| 91 <context>location</context> | |
| 92 | |
| 93 <para> | |
| 94 Sets the maximum size of chunks | |
| 95 into which the response body is sliced. | |
| 96 A too low value results in higher overhead. | |
| 97 A too high value impairs prioritization due to | |
| 98 <link url="http://en.wikipedia.org/wiki/Head-of-line_blocking"> | |
| 99 HOL blocking</link>. | |
| 100 </para> | |
| 101 | |
| 102 </directive> | |
| 103 | |
| 104 | |
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105 <directive name="http2_body_preread_size"> |
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106 <syntax><value>size</value></syntax> |
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107 <default>64k</default> |
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108 <context>http</context> |
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109 <context>server</context> |
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110 <appeared-in>1.11.0</appeared-in> |
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111 |
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112 <para> |
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113 Sets the <value>size</value> of the buffer per each request |
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114 in which the request body may be saved |
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115 before it is started to be processed. |
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116 </para> |
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117 |
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118 </directive> |
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119 |
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120 |
| 1566 | 121 <directive name="http2_idle_timeout"> |
| 122 <syntax><value>time</value></syntax> | |
| 123 <default>3m</default> | |
| 124 <context>http</context> | |
| 125 <context>server</context> | |
| 126 | |
| 127 <para> | |
| 128 Sets the timeout of inactivity after which the connection is closed. | |
| 129 </para> | |
| 130 | |
| 131 </directive> | |
| 132 | |
| 133 | |
| 134 <directive name="http2_max_concurrent_streams"> | |
| 135 <syntax><value>number</value></syntax> | |
| 136 <default>128</default> | |
| 137 <context>http</context> | |
| 138 <context>server</context> | |
| 139 | |
| 140 <para> | |
| 141 Sets the maximum number of concurrent HTTP/2 streams | |
| 142 in a connection. | |
| 143 </para> | |
| 144 | |
| 145 </directive> | |
| 146 | |
| 147 | |
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148 <directive name="http2_max_field_size"> |
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149 <syntax><value>size</value></syntax> |
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150 <default>4k</default> |
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151 <context>http</context> |
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152 <context>server</context> |
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153 |
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154 <para> |
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155 Limits the maximum size of |
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156 an <link url="http://tools.ietf.org/html/rfc7541">HPACK</link>-compressed |
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157 request header field. |
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158 The limit applies equally to both name and value. |
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159 Note that if Huffman encoding is applied, |
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160 the actual size of decompressed name and value strings may be larger. |
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161 For most requests, the default limit should be enough. |
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162 </para> |
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163 |
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164 </directive> |
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165 |
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166 |
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167 <directive name="http2_max_header_size"> |
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168 <syntax><value>size</value></syntax> |
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169 <default>16k</default> |
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170 <context>http</context> |
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171 <context>server</context> |
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172 |
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173 <para> |
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174 Limits the maximum size of the entire request header list after |
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175 <link url="http://tools.ietf.org/html/rfc7541">HPACK</link> decompression. |
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176 For most requests, the default limit should be enough. |
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177 </para> |
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178 |
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179 </directive> |
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180 |
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181 |
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182 <directive name="http2_max_requests"> |
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183 <syntax><value>number</value></syntax> |
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184 <default>1000</default> |
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185 <context>http</context> |
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186 <context>server</context> |
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187 <context>location</context> |
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188 <appeared-in>1.11.6</appeared-in> |
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189 |
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190 <para> |
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191 Sets the maximum number of requests that can be |
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192 served through one HTTP/2 connection, |
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193 after which the connection is closed |
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194 and the client should use a new connection. |
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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 |
| 1566 | 200 <directive name="http2_recv_buffer_size"> |
| 201 <syntax><value>size</value></syntax> | |
| 202 <default>256k</default> | |
| 203 <context>http</context> | |
| 204 | |
| 205 <para> | |
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206 Sets the size of the per |
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207 <link doc="../ngx_core_module.xml" id="worker_processes">worker</link> |
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208 input buffer. |
| 1566 | 209 </para> |
| 210 | |
| 211 </directive> | |
| 212 | |
| 213 | |
| 214 <directive name="http2_recv_timeout"> | |
| 215 <syntax><value>time</value></syntax> | |
| 216 <default>30s</default> | |
| 217 <context>http</context> | |
| 218 <context>server</context> | |
| 219 | |
| 220 <para> | |
| 221 Sets the timeout for expecting more data from the client, | |
| 222 after which the connection is closed. | |
| 223 </para> | |
| 224 | |
| 225 </directive> | |
| 226 | |
| 227 </section> | |
| 228 | |
| 229 | |
| 230 <section id="variables" name="Embedded Variables"> | |
| 231 | |
| 232 <para> | |
| 233 The <literal>ngx_http_v2_module</literal> module | |
| 234 supports the following embedded variables: | |
| 235 <list type="tag" compact="no"> | |
| 236 | |
| 237 <tag-name id="var_http2"><var>$http2</var></tag-name> | |
| 238 <tag-desc> | |
| 239 negotiated protocol identifier: | |
| 240 “<literal>h2</literal>” for HTTP/2 over TLS, | |
| 241 “<literal>h2c</literal>” for HTTP/2 over cleartext TCP, | |
| 242 or an empty string otherwise. | |
| 243 </tag-desc> | |
| 244 | |
| 245 </list> | |
| 246 </para> | |
| 247 | |
| 248 </section> | |
| 249 | |
| 250 </module> |