Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_v2_module.xml @ 2591:f27cedd43e0f
Corrected syntax of js_path in stream.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 02 Sep 2020 16:10:37 +0300 |
parents | 4f3494d80949 |
children | d13341d3c54a |
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="13"> |
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 <para> |
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46 Before version 1.19.1, |
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47 the <link doc="ngx_http_core_module.xml" id="lingering_close"/> mechanism |
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48 was not used to control closing HTTP/2 connections. |
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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 |
1566 | 54 <section id="example" name="Example Configuration"> |
55 | |
56 <para> | |
57 <example> | |
58 server { | |
59 listen 443 ssl http2; | |
60 | |
61 ssl_certificate server.crt; | |
62 ssl_certificate_key server.key; | |
63 } | |
64 </example> | |
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65 Note that accepting HTTP/2 connections over TLS requires |
1566 | 66 the “Application-Layer Protocol Negotiation” (ALPN) TLS extension |
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67 support, which is available only since |
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68 <link url="http://www.openssl.org">OpenSSL</link> version 1.0.2. |
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69 Using the “Next Protocol Negotiation” (NPN) TLS extension for this purpose |
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70 (available since OpenSSL version 1.0.1) is not guaranteed to work. |
1566 | 71 </para> |
72 | |
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73 <para> |
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74 Also note that if the |
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75 <link doc="ngx_http_ssl_module.xml" id="ssl_prefer_server_ciphers"/> directive |
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76 is set to the value “<literal>on</literal>”, |
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77 the <link doc="ngx_http_ssl_module.xml" id="ssl_ciphers">ciphers</link> |
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78 should be configured to comply with |
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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 black list and supported by clients. |
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81 </para> |
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82 |
1566 | 83 </section> |
84 | |
85 | |
86 <section id="directives" name="Directives"> | |
87 | |
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88 <directive name="http2_body_preread_size"> |
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89 <syntax><value>size</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 Sets the <value>size</value> of the buffer per each request |
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97 in which the request body may be saved |
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98 before it is started to be processed. |
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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 |
1566 | 104 <directive name="http2_chunk_size"> |
105 <syntax><value>size</value></syntax> | |
106 <default>8k</default> | |
107 <context>http</context> | |
108 <context>server</context> | |
109 <context>location</context> | |
110 | |
111 <para> | |
112 Sets the maximum size of chunks | |
113 into which the response body is sliced. | |
114 A too low value results in higher overhead. | |
115 A too high value impairs prioritization due to | |
116 <link url="http://en.wikipedia.org/wiki/Head-of-line_blocking"> | |
117 HOL blocking</link>. | |
118 </para> | |
119 | |
120 </directive> | |
121 | |
122 | |
123 <directive name="http2_idle_timeout"> | |
124 <syntax><value>time</value></syntax> | |
125 <default>3m</default> | |
126 <context>http</context> | |
127 <context>server</context> | |
128 | |
129 <para> | |
130 Sets the timeout of inactivity after which the connection is closed. | |
131 </para> | |
132 | |
133 </directive> | |
134 | |
135 | |
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136 <directive name="http2_max_concurrent_pushes"> |
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137 <syntax><value>number</value></syntax> |
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138 <default>10</default> |
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139 <context>http</context> |
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140 <context>server</context> |
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141 <appeared-in>1.13.9</appeared-in> |
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142 |
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143 <para> |
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144 Limits the maximum number of concurrent |
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145 <link id="http2_push">push</link> requests in a connection. |
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146 </para> |
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147 |
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148 </directive> |
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149 |
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150 |
1566 | 151 <directive name="http2_max_concurrent_streams"> |
152 <syntax><value>number</value></syntax> | |
153 <default>128</default> | |
154 <context>http</context> | |
155 <context>server</context> | |
156 | |
157 <para> | |
158 Sets the maximum number of concurrent HTTP/2 streams | |
159 in a connection. | |
160 </para> | |
161 | |
162 </directive> | |
163 | |
164 | |
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165 <directive name="http2_max_field_size"> |
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166 <syntax><value>size</value></syntax> |
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167 <default>4k</default> |
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168 <context>http</context> |
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169 <context>server</context> |
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170 |
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171 <para> |
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172 Limits the maximum size of |
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173 an <link url="https://tools.ietf.org/html/rfc7541">HPACK</link>-compressed |
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174 request header field. |
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175 The limit applies equally to both name and value. |
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176 Note that if Huffman encoding is applied, |
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177 the actual size of decompressed name and value strings may be larger. |
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178 For most requests, the default limit should be enough. |
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179 </para> |
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180 |
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181 </directive> |
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182 |
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183 |
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184 <directive name="http2_max_header_size"> |
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185 <syntax><value>size</value></syntax> |
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186 <default>16k</default> |
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187 <context>http</context> |
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188 <context>server</context> |
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189 |
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190 <para> |
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191 Limits the maximum size of the entire request header list after |
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192 <link url="https://tools.ietf.org/html/rfc7541">HPACK</link> decompression. |
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193 For most requests, the default limit should be enough. |
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194 </para> |
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195 |
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196 </directive> |
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197 |
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198 |
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199 <directive name="http2_max_requests"> |
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200 <syntax><value>number</value></syntax> |
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201 <default>1000</default> |
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202 <context>http</context> |
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203 <context>server</context> |
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204 <appeared-in>1.11.6</appeared-in> |
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205 |
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206 <para> |
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207 Sets the maximum number of requests (including |
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208 <link id="http2_push">push</link> requests) that can be served |
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209 through one HTTP/2 connection, |
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210 after which the next client request will lead to connection closing |
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211 and the need of establishing a new connection. |
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212 </para> |
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213 |
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214 <para> |
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215 Closing connections periodically is necessary to free |
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216 per-connection memory allocations. |
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217 Therefore, using too high maximum number of requests |
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218 could result in excessive memory usage and not recommended. |
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219 </para> |
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220 |
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221 </directive> |
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222 |
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223 |
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224 <directive name="http2_push"> |
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225 <syntax><value>uri</value> | <literal>off</literal></syntax> |
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226 <default>off</default> |
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227 <context>http</context> |
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228 <context>server</context> |
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229 <context>location</context> |
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230 <appeared-in>1.13.9</appeared-in> |
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231 |
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232 <para> |
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233 Pre-emptively sends |
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234 (<link url="https://tools.ietf.org/html/rfc7540#section-8.2">pushes</link>) |
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235 a request to the specified <value>uri</value> |
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236 along with the response to the original request. |
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237 Only relative URIs with absolute path will be processed, |
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238 for example: |
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239 <example> |
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240 http2_push /static/css/main.css; |
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241 </example> |
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242 The <value>uri</value> value can contain variables. |
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243 </para> |
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244 |
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245 <para> |
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246 Several <literal>http2_push</literal> directives |
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247 can be specified on the same configuration level. |
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248 The <literal>off</literal> parameter cancels the effect |
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249 of the <literal>http2_push</literal> directives |
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250 inherited from the previous configuration level. |
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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_preload"> |
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257 <syntax><literal>on</literal> | <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 Enables automatic conversion of |
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266 <link url="https://www.w3.org/TR/preload/#server-push-http-2">preload |
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267 links</link> |
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268 specified in the <header>Link</header> response header fields into |
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269 <link url="https://tools.ietf.org/html/rfc7540#section-8.2">push</link> |
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270 requests. |
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271 </para> |
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272 |
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273 </directive> |
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274 |
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275 |
1566 | 276 <directive name="http2_recv_buffer_size"> |
277 <syntax><value>size</value></syntax> | |
278 <default>256k</default> | |
279 <context>http</context> | |
280 | |
281 <para> | |
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282 Sets the size of the per |
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283 <link doc="../ngx_core_module.xml" id="worker_processes">worker</link> |
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284 input buffer. |
1566 | 285 </para> |
286 | |
287 </directive> | |
288 | |
289 | |
290 <directive name="http2_recv_timeout"> | |
291 <syntax><value>time</value></syntax> | |
292 <default>30s</default> | |
293 <context>http</context> | |
294 <context>server</context> | |
295 | |
296 <para> | |
297 Sets the timeout for expecting more data from the client, | |
298 after which the connection is closed. | |
299 </para> | |
300 | |
301 </directive> | |
302 | |
303 </section> | |
304 | |
305 | |
306 <section id="variables" name="Embedded Variables"> | |
307 | |
308 <para> | |
309 The <literal>ngx_http_v2_module</literal> module | |
310 supports the following embedded variables: | |
311 <list type="tag" compact="no"> | |
312 | |
313 <tag-name id="var_http2"><var>$http2</var></tag-name> | |
314 <tag-desc> | |
315 negotiated protocol identifier: | |
316 “<literal>h2</literal>” for HTTP/2 over TLS, | |
317 “<literal>h2c</literal>” for HTTP/2 over cleartext TCP, | |
318 or an empty string otherwise. | |
319 </tag-desc> | |
320 | |
321 </list> | |
322 </para> | |
323 | |
324 </section> | |
325 | |
326 </module> |