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annotate xml/en/docs/http/ngx_http_spdy_module.xml @ 1566:0ca33afb461b

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Added the http2 module.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 15 Sep 2015 21:00:27 +0300
parents ed420c318557
children 31f21c7956dd
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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_spdy_module"
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10 link="/en/docs/http/ngx_http_spdy_module.html"
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11 lang="en"
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12 rev="8">
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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_spdy_module</literal> module provides experimental
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18 support for <link url="http://www.chromium.org/spdy/spdy-protocol">SPDY</link>.
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19 Currently,
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20 <link url="http://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3-1">draft
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21 3.1</link> of SPDY protocol is implemented.
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22 <note>
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23 Before version 1.5.10,
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24 <link url="http://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft2">draft
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25 2</link> of SPDY protocol was implemented.
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26 </note>
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27 </para>
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28
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29 <para>
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30 This module is not built by default, it should be enabled with
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31 the <literal>--with-http_spdy_module</literal>
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32 configuration parameter.
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33 </para>
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34
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35 <para>
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36 <note>
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37 This module was superseded by the
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38 <link doc="ngx_http_v2_module.xml">ngx_http_v2_module</link> module
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39 in 1.9.5.
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40 </note>
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41 </para>
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42
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43 </section>
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44
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45
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46 <section id="bugs" name="Known Bugs">
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47
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48 <para>
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49 The module is experimental, caveat emptor applies.
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50 </para>
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51
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52 <para>
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53 Current implementation of SPDY protocol does not support “server push”.
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54 </para>
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55
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56 <para>
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57 In versions prior to 1.5.9, responses in SPDY connections could not be
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58 <link doc="ngx_http_core_module.xml" id="limit_rate">rate limited</link>.
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59 </para>
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60
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61 <para>
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62 Buffering of a client request body cannot be disabled
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63 regardless of
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64 <link doc="ngx_http_proxy_module.xml" id="proxy_request_buffering"/>,
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65 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_request_buffering"/>,
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66 <link doc="ngx_http_uwsgi_module.xml" id="uwsgi_request_buffering"/>, and
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67 <link doc="ngx_http_scgi_module.xml" id="scgi_request_buffering"/>
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68 directive values.
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69 </para>
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70
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71 </section>
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72
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73
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74 <section id="example" name="Example Configuration">
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75
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76 <para>
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77 <example>
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78 server {
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79 listen 443 ssl spdy;
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80
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81 ssl_certificate server.crt;
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82 ssl_certificate_key server.key;
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83 ...
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84 }
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85 </example>
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86 <note>
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87 Note that in order to accept both
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88 <link doc="ngx_http_ssl_module.xml">HTTPS</link> and SPDY connections
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89 simultaneously on the same port,
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90 <link url="http://www.openssl.org">OpenSSL</link> library used should support
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91 “Next Protocol Negotiation” TLS extension, available since OpenSSL
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92 version 1.0.1.
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93 </note>
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94 </para>
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95
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96 </section>
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97
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98
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99 <section id="directives" name="Directives">
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100
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101 <directive name="spdy_chunk_size">
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102 <syntax><value>size</value></syntax>
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103 <default>8k</default>
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104 <context>http</context>
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105 <context>server</context>
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106 <context>location</context>
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107 <appeared-in>1.5.9</appeared-in>
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108
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109 <para>
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110 Sets the maximum size of chunks
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111 into which the response body is
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112 <link url="http://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft2#TOC-Data-frames">
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113 sliced</link>.
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114 A too low value results in higher overhead.
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115 A too high value impairs prioritization due to
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116 <link url="http://en.wikipedia.org/wiki/Head-of-line_blocking">
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117 HOL blocking</link>.
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118 </para>
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119
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120 </directive>
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121
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122
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123 <directive name="spdy_headers_comp">
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124 <syntax><value>level</value></syntax>
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125 <default>0</default>
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126 <context>http</context>
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127 <context>server</context>
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128
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129 <para>
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130 Sets the header compression <value>level</value> of a response in a range from
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131 1 (fastest, less compression) to 9 (slowest, best compression).
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132 The special value 0 turns off the header compression.
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133 </para>
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134
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135 </directive>
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136
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137 </section>
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138
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139
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140 <section id="variables" name="Embedded Variables">
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141
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142 <para>
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143 The <literal>ngx_http_spdy_module</literal> module
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144 supports the following embedded variables:
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145 <list type="tag" compact="no">
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146
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147 <tag-name id="var_spdy"><var>$spdy</var></tag-name>
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148 <tag-desc>
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149 SPDY protocol version for SPDY connections,
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150 or an empty string otherwise;
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151 </tag-desc>
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152
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153 <tag-name id="var_spdy_request_priority"><var>$spdy_request_priority</var>
ade81792bdaa Documented SPDY support.
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154 </tag-name>
ade81792bdaa Documented SPDY support.
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parents:
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155 <tag-desc>
ade81792bdaa Documented SPDY support.
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parents:
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156 request priority for SPDY connections,
ade81792bdaa Documented SPDY support.
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parents:
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157 or an empty string otherwise.
ade81792bdaa Documented SPDY support.
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parents:
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158 </tag-desc>
ade81792bdaa Documented SPDY support.
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parents:
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159
ade81792bdaa Documented SPDY support.
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parents:
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160 </list>
ade81792bdaa Documented SPDY support.
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parents:
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161 </para>
ade81792bdaa Documented SPDY support.
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parents:
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162
ade81792bdaa Documented SPDY support.
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parents:
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163 </section>
ade81792bdaa Documented SPDY support.
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164
ade81792bdaa Documented SPDY support.
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165 </module>