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annotate xml/en/docs/http/ngx_http_spdy_module.xml @ 1561:ed420c318557

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Updated docs for the upcoming NGINX Plus release.
author Ruslan Ermilov <ru@nginx.com>
date Thu, 10 Sep 2015 15:50:32 +0300
parents a32df48d88fc
children 0ca33afb461b
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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="7">
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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 is not available in the <literal>nginx-plus-http2</literal> package.
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38 </note>
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39 </para>
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40
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41 </section>
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42
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43
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44 <section id="bugs" name="Known Bugs">
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45
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46 <para>
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47 The module is experimental, caveat emptor applies.
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48 </para>
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49
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50 <para>
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51 Current implementation of SPDY protocol does not support “server push”.
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52 </para>
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53
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54 <para>
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55 In versions prior to 1.5.9, responses in SPDY connections could not be
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56 <link doc="ngx_http_core_module.xml" id="limit_rate">rate limited</link>.
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57 </para>
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58
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59 <para>
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60 Buffering of a client request body cannot be disabled
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61 regardless of
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62 <link doc="ngx_http_proxy_module.xml" id="proxy_request_buffering"/>,
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63 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_request_buffering"/>,
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64 <link doc="ngx_http_uwsgi_module.xml" id="uwsgi_request_buffering"/>, and
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65 <link doc="ngx_http_scgi_module.xml" id="scgi_request_buffering"/>
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66 directive values.
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67 </para>
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68
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69 </section>
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70
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71
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72 <section id="example" name="Example Configuration">
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73
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74 <para>
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75 <example>
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76 server {
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77 listen 443 ssl spdy;
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78
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79 ssl_certificate server.crt;
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80 ssl_certificate_key server.key;
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81 ...
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82 }
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83 </example>
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84 <note>
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85 Note that in order to accept both
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86 <link doc="ngx_http_ssl_module.xml">HTTPS</link> and SPDY connections
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87 simultaneously on the same port,
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88 <link url="http://www.openssl.org">OpenSSL</link> library used should support
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89 “Next Protocol Negotiation” TLS extension, available since OpenSSL
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90 version 1.0.1.
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91 </note>
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92 </para>
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93
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94 </section>
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95
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96
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97 <section id="directives" name="Directives">
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98
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99 <directive name="spdy_chunk_size">
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100 <syntax><value>size</value></syntax>
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101 <default>8k</default>
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102 <context>http</context>
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103 <context>server</context>
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104 <context>location</context>
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105 <appeared-in>1.5.9</appeared-in>
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106
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107 <para>
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108 Sets the maximum size of chunks
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109 into which the response body is
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110 <link url="http://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft2#TOC-Data-frames">
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111 sliced</link>.
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112 A too low value results in higher overhead.
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113 A too high value impairs prioritization due to
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114 <link url="http://en.wikipedia.org/wiki/Head-of-line_blocking">
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115 HOL blocking</link>.
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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
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121 <directive name="spdy_headers_comp">
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122 <syntax><value>level</value></syntax>
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123 <default>0</default>
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124 <context>http</context>
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125 <context>server</context>
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126
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127 <para>
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128 Sets the header compression <value>level</value> of a response in a range from
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129 1 (fastest, less compression) to 9 (slowest, best compression).
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130 The special value 0 turns off the header compression.
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131 </para>
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132
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133 </directive>
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134
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135 </section>
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136
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137
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138 <section id="variables" name="Embedded Variables">
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139
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140 <para>
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141 The <literal>ngx_http_spdy_module</literal> module
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142 supports the following embedded variables:
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143 <list type="tag" compact="no">
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144
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145 <tag-name id="var_spdy"><var>$spdy</var></tag-name>
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146 <tag-desc>
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147 SPDY protocol version for SPDY connections,
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148 or an empty string otherwise;
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149 </tag-desc>
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150
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151 <tag-name id="var_spdy_request_priority"><var>$spdy_request_priority</var>
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152 </tag-name>
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153 <tag-desc>
ade81792bdaa Documented SPDY support.
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154 request priority for SPDY connections,
ade81792bdaa Documented SPDY support.
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155 or an empty string otherwise.
ade81792bdaa Documented SPDY support.
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parents:
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156 </tag-desc>
ade81792bdaa Documented SPDY support.
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157
ade81792bdaa Documented SPDY support.
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158 </list>
ade81792bdaa Documented SPDY support.
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159 </para>
ade81792bdaa Documented SPDY support.
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160
ade81792bdaa Documented SPDY support.
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161 </section>
ade81792bdaa Documented SPDY support.
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parents:
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162
ade81792bdaa Documented SPDY support.
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163 </module>