Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_v2_module.xml @ 2559:82e6029db0c0
Updated with Netcraft June 2020 Web Server Survey stats.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Thu, 25 Jun 2020 13:12:56 +0100 |
parents | a26a42699207 |
children | 4f3494d80949 |
rev | line source |
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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="12"> |
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 | |
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82 <directive name="http2_body_preread_size"> |
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83 <syntax><value>size</value></syntax> |
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84 <default>64k</default> |
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85 <context>http</context> |
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86 <context>server</context> |
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87 <appeared-in>1.11.0</appeared-in> |
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88 |
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89 <para> |
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90 Sets the <value>size</value> of the buffer per each request |
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91 in which the request body may be saved |
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92 before it is started to be processed. |
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93 </para> |
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94 |
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95 </directive> |
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96 |
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97 |
1566 | 98 <directive name="http2_chunk_size"> |
99 <syntax><value>size</value></syntax> | |
100 <default>8k</default> | |
101 <context>http</context> | |
102 <context>server</context> | |
103 <context>location</context> | |
104 | |
105 <para> | |
106 Sets the maximum size of chunks | |
107 into which the response body is sliced. | |
108 A too low value results in higher overhead. | |
109 A too high value impairs prioritization due to | |
110 <link url="http://en.wikipedia.org/wiki/Head-of-line_blocking"> | |
111 HOL blocking</link>. | |
112 </para> | |
113 | |
114 </directive> | |
115 | |
116 | |
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 | |
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130 <directive name="http2_max_concurrent_pushes"> |
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131 <syntax><value>number</value></syntax> |
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132 <default>10</default> |
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133 <context>http</context> |
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134 <context>server</context> |
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135 <appeared-in>1.13.9</appeared-in> |
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136 |
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137 <para> |
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138 Limits the maximum number of concurrent |
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139 <link id="http2_push">push</link> requests in a connection. |
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140 </para> |
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141 |
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142 </directive> |
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143 |
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144 |
1566 | 145 <directive name="http2_max_concurrent_streams"> |
146 <syntax><value>number</value></syntax> | |
147 <default>128</default> | |
148 <context>http</context> | |
149 <context>server</context> | |
150 | |
151 <para> | |
152 Sets the maximum number of concurrent HTTP/2 streams | |
153 in a connection. | |
154 </para> | |
155 | |
156 </directive> | |
157 | |
158 | |
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159 <directive name="http2_max_field_size"> |
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160 <syntax><value>size</value></syntax> |
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161 <default>4k</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 Limits the maximum size of |
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167 an <link url="https://tools.ietf.org/html/rfc7541">HPACK</link>-compressed |
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168 request header field. |
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169 The limit applies equally to both name and value. |
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170 Note that if Huffman encoding is applied, |
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171 the actual size of decompressed name and value strings may be larger. |
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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_header_size"> |
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179 <syntax><value>size</value></syntax> |
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180 <default>16k</default> |
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181 <context>http</context> |
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182 <context>server</context> |
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183 |
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184 <para> |
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185 Limits the maximum size of the entire request header list after |
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186 <link url="https://tools.ietf.org/html/rfc7541">HPACK</link> decompression. |
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187 For most requests, the default limit should be enough. |
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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 |
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193 <directive name="http2_max_requests"> |
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194 <syntax><value>number</value></syntax> |
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195 <default>1000</default> |
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196 <context>http</context> |
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197 <context>server</context> |
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198 <appeared-in>1.11.6</appeared-in> |
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199 |
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200 <para> |
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201 Sets the maximum number of requests (including |
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202 <link id="http2_push">push</link> requests) that can be served |
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203 through one HTTP/2 connection, |
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204 after which the next client request will lead to connection closing |
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205 and the need of establishing a new connection. |
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206 </para> |
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207 |
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208 <para> |
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209 Closing connections periodically is necessary to free |
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210 per-connection memory allocations. |
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211 Therefore, using too high maximum number of requests |
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212 could result in excessive memory usage and not recommended. |
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213 </para> |
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214 |
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215 </directive> |
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216 |
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217 |
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218 <directive name="http2_push"> |
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219 <syntax><value>uri</value> | <literal>off</literal></syntax> |
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220 <default>off</default> |
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221 <context>http</context> |
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222 <context>server</context> |
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223 <context>location</context> |
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224 <appeared-in>1.13.9</appeared-in> |
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225 |
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226 <para> |
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227 Pre-emptively sends |
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228 (<link url="https://tools.ietf.org/html/rfc7540#section-8.2">pushes</link>) |
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229 a request to the specified <value>uri</value> |
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230 along with the response to the original request. |
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231 Only relative URIs with absolute path will be processed, |
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232 for example: |
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233 <example> |
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234 http2_push /static/css/main.css; |
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235 </example> |
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236 The <value>uri</value> value can contain variables. |
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237 </para> |
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238 |
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239 <para> |
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240 Several <literal>http2_push</literal> directives |
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241 can be specified on the same configuration level. |
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242 The <literal>off</literal> parameter cancels the effect |
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243 of the <literal>http2_push</literal> directives |
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244 inherited from the previous configuration level. |
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245 </para> |
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246 |
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247 </directive> |
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248 |
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249 |
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250 <directive name="http2_push_preload"> |
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251 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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252 <default>off</default> |
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253 <context>http</context> |
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254 <context>server</context> |
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255 <context>location</context> |
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256 <appeared-in>1.13.9</appeared-in> |
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257 |
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258 <para> |
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259 Enables automatic conversion of |
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260 <link url="https://www.w3.org/TR/preload/#server-push-http-2">preload |
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261 links</link> |
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262 specified in the <header>Link</header> response header fields into |
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263 <link url="https://tools.ietf.org/html/rfc7540#section-8.2">push</link> |
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264 requests. |
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265 </para> |
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266 |
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267 </directive> |
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268 |
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269 |
1566 | 270 <directive name="http2_recv_buffer_size"> |
271 <syntax><value>size</value></syntax> | |
272 <default>256k</default> | |
273 <context>http</context> | |
274 | |
275 <para> | |
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276 Sets the size of the per |
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277 <link doc="../ngx_core_module.xml" id="worker_processes">worker</link> |
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278 input buffer. |
1566 | 279 </para> |
280 | |
281 </directive> | |
282 | |
283 | |
284 <directive name="http2_recv_timeout"> | |
285 <syntax><value>time</value></syntax> | |
286 <default>30s</default> | |
287 <context>http</context> | |
288 <context>server</context> | |
289 | |
290 <para> | |
291 Sets the timeout for expecting more data from the client, | |
292 after which the connection is closed. | |
293 </para> | |
294 | |
295 </directive> | |
296 | |
297 </section> | |
298 | |
299 | |
300 <section id="variables" name="Embedded Variables"> | |
301 | |
302 <para> | |
303 The <literal>ngx_http_v2_module</literal> module | |
304 supports the following embedded variables: | |
305 <list type="tag" compact="no"> | |
306 | |
307 <tag-name id="var_http2"><var>$http2</var></tag-name> | |
308 <tag-desc> | |
309 negotiated protocol identifier: | |
310 “<literal>h2</literal>” for HTTP/2 over TLS, | |
311 “<literal>h2c</literal>” for HTTP/2 over cleartext TCP, | |
312 or an empty string otherwise. | |
313 </tag-desc> | |
314 | |
315 </list> | |
316 </para> | |
317 | |
318 </section> | |
319 | |
320 </module> |