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annotate xml/en/docs/http/ngx_http_js_module.xml @ 2149:6df1a86a60b8

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Added new njs HTTP properties and methods.
author Roman Arutyunyan <arut@nginx.com>
date Fri, 06 Apr 2018 20:34:26 +0300
parents ca7568f67dee
children cd4889fdcfa4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_js_module"
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10 link="/en/docs/http/ngx_http_js_module.html"
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11 lang="en"
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12 rev="10">
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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_js_module</literal> module is used to implement
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18 location and variable handlers
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19 in <link doc="../njs_about.xml">njs</link> —
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20 a subset of the JavaScript language.
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21 </para>
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22
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23 <para>
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24 This module is not built by default, it should be compiled with
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25 the njs module using the
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26 <literal>--add-module</literal> configuration parameter:
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27 <example>
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28 ./configure --add-module=<value>path-to-njs</value>/nginx
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29 </example>
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30 The <link url="http://hg.nginx.org/njs">repository</link>
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31 with the njs module can be cloned with the following command
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32 (requires <link url="https://www.mercurial-scm.org">Mercurial</link> client):
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33 <example>
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34 hg clone http://hg.nginx.org/njs
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35 </example>
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36 This module can also be built as
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37 <link doc="../ngx_core_module.xml" id="load_module">dynamic</link>:
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38 <example>
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39 ./configure --add-dynamic-module=<value>path-to-njs</value>/nginx
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40 </example>
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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="example" name="Example Configuration">
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47
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48 <para>
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49 <example>
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50 js_include http.js;
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51
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52 js_set $foo foo;
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53 js_set $summary summary;
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54
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55 server {
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56 listen 8000;
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57
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58 location / {
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59 add_header X-Foo $foo;
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60 js_content baz;
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61 }
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62
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63 location /summary {
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64 return 200 $summary;
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65 }
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66 }
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67 </example>
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68 </para>
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69
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70 <para>
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71 The <path>http.js</path> file:
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72 <example>
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73 function foo(req, res) {
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74 req.log("hello from foo() handler");
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75 return "foo";
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76 }
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77
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78 function summary(req, res) {
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79 var a, s, h;
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80
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81 s = "JS summary\n\n";
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82
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83 s += "Method: " + req.method + "\n";
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84 s += "HTTP version: " + req.httpVersion + "\n";
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85 s += "Host: " + req.headers.host + "\n";
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86 s += "Remote Address: " + req.remoteAddress + "\n";
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87 s += "URI: " + req.uri + "\n";
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88
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89 s += "Headers:\n";
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90 for (h in req.headers) {
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91 s += " header '" + h + "' is '" + req.headers[h] + "'\n";
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92 }
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93
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94 s += "Args:\n";
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95 for (a in req.args) {
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96 s += " arg '" + a + "' is '" + req.args[a] + "'\n";
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97 }
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98
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99 return s;
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100 }
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101
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102 function baz(req, res) {
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103 res.headers.foo = 1234;
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104 res.status = 200;
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105 res.contentType = "text/plain; charset=utf-8";
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106 res.contentLength = 15;
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107 res.sendHeader();
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108 res.send("nginx");
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109 res.send("java");
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110 res.send("script");
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111
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112 res.finish();
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113 }
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114 </example>
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115 </para>
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116
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117 </section>
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118
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119
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120 <section id="directives" name="Directives">
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121
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122 <directive name="js_content">
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123 <syntax><value>function</value></syntax>
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124 <default/>
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125 <context>location</context>
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126 <context>limit_except</context>
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127
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128 <para>
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129 Sets an njs function as a location content handler.
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130 </para>
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131
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132 </directive>
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133
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134
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135 <directive name="js_include">
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136 <syntax><value>file</value></syntax>
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137 <default/>
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138 <context>http</context>
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139
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140 <para>
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141 Specifies a file that implements location and variable handlers in njs.
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142 </para>
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143
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144 </directive>
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145
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146
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147 <directive name="js_set">
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148 <syntax>
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149 <value>$variable</value> <value>function</value></syntax>
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150 <default/>
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151 <context>http</context>
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152
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153 <para>
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154 Sets an njs function for the specified variable.
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155 </para>
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156
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157 </directive>
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158
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159 </section>
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160
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161
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162 <section id="arguments" name="Request and Response Arguments">
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163 <para>
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164 Each HTTP njs handler receives two arguments, request and response.
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165 </para>
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166
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167 <para>
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168 The request object has the following properties:
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169 <list type="tag">
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170
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171 <tag-name><literal>uri</literal></tag-name>
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172 <tag-desc>
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173 current URI in a request, read-only
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174 </tag-desc>
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175
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176 <tag-name><literal>method</literal></tag-name>
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177 <tag-desc>
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178 request method, read-only
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179 </tag-desc>
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180
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181 <tag-name><literal>httpVersion</literal></tag-name>
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182 <tag-desc>
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183 HTTP version, read-only
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184 </tag-desc>
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185
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186 <tag-name><literal>remoteAddress</literal></tag-name>
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187 <tag-desc>
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188 client address, read-only
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189 </tag-desc>
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190
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191 <tag-name><literal>headers{}</literal></tag-name>
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192 <tag-desc>
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193 request headers object, read-only.
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194 <para>
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195 For example, the <literal>Header-Name</literal> header
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196 can be accessed with the syntax <literal>headers['Header-Name']</literal>
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197 or <literal>headers.Header_name</literal>
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198 </para>
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199 </tag-desc>
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200
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201 <tag-name><literal>args{}</literal></tag-name>
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202 <tag-desc>
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203 request arguments object, read-only
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204 </tag-desc>
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205
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206 <tag-name><literal>variables{}</literal></tag-name>
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207 <tag-desc>
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208 nginx variables object, read-only
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209 </tag-desc>
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210
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211 <tag-name><literal>response</literal></tag-name>
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212 <tag-desc>
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213 the response object (0.2.0), read-only
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214 </tag-desc>
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215 </list>
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216 </para>
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217
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218 <para>
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219 The request object has the following methods:
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220 <list type="tag">
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221
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222 <tag-name><literal>log(<value>string</value>)</literal></tag-name>
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223 <tag-desc>
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224 writes a <literal>string</literal> to the error log
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225 on the <literal>info</literal> level of logging
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226 </tag-desc>
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227
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228 <tag-name><literal>warn(<value>string</value>)</literal></tag-name>
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229 <tag-desc>
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230 writes a <literal>string</literal> to the error log
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231 on the <literal>warning</literal> level of logging (0.2.0)
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232 </tag-desc>
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233
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234 <tag-name><literal>error(<value>string</value>)</literal></tag-name>
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235 <tag-desc>
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236 writes a <literal>string</literal> to the error log
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237 on the <literal>error</literal> level of logging (0.2.0)
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238 </tag-desc>
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239
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240 <tag-name><literal>subrequest(<value>uri</value>[, <value>options</value>[,
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241 <value>callback</value>]])</literal></tag-name>
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242 <tag-desc>
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243 creates a subrequest with the given <literal>uri</literal> and
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244 <literal>options</literal>, and installs
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245 an optional completion <literal>callback</literal> (0.2.0).
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246
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247 <para>
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248 If <literal>options</literal> is a string, then it
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249 holds the subrequest arguments string.
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250 Otherwise <literal>options</literal> is expected to be
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251 an object with the following keys:
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252 <list type="tag">
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253 <tag-name><literal>args</literal></tag-name>
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254 <tag-desc>arguments string</tag-desc>
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255
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256 <tag-name><literal>body</literal></tag-name>
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257 <tag-desc>request body</tag-desc>
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258
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259 <tag-name><literal>method</literal></tag-name>
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260 <tag-desc>HTTP method</tag-desc>
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261 </list>
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262 </para>
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263
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264 <para>
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265 The <literal>callback</literal> receives a response object
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266 with the following properties:
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267 <literal>uri</literal>, <literal>method</literal>,
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268 <literal>status</literal>, <literal>contentType</literal>,
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269 <literal>contentLength</literal>, <literal>headers</literal>,
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270 <literal>args</literal>.
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271 These properties have the same meaning as the request object properties.
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272 Additionally, a reply object has the <literal>body</literal> property
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273 holding the subrequest response body
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274 and the <literal>parent</literal> property
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275 referencing the parent request object.
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276 </para>
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277 </tag-desc>
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278 </list>
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279 </para>
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280
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281 <para>
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282 The response object has the following properties:
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283 <list type="tag">
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284
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285 <tag-name><literal>status</literal></tag-name>
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286 <tag-desc>
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287 response status, writable
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288 </tag-desc>
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289
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290 <tag-name><literal>headers{}</literal></tag-name>
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291 <tag-desc>
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292 response headers object
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293 </tag-desc>
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294
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295 <tag-name><literal>contentType</literal></tag-name>
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296 <tag-desc>
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297 the response <header>Content-Type</header> header field value, writable
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298 </tag-desc>
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299
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300 <tag-name><literal>contentLength</literal></tag-name>
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301 <tag-desc>
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302 the response <header>Content-Length</header> header field value, writable
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303 </tag-desc>
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304 </list>
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305 </para>
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306
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307 <para>
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308 The response object has the following methods:
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309 <list type="tag">
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310
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311 <tag-name><literal>sendHeader()</literal></tag-name>
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312 <tag-desc>
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313 sends the HTTP header to the client
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314 </tag-desc>
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315
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316 <tag-name><literal>send(<value>string</value>)</literal></tag-name>
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317 <tag-desc>
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318 sends a part of the response body to the client
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319 </tag-desc>
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320
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321 <tag-name><literal>finish()</literal></tag-name>
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322 <tag-desc>
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323 finishes sending a response to the client
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324 </tag-desc>
2149
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325
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326 <tag-name><literal>return(status[, string])</literal></tag-name>
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327 <tag-desc>
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328 sends
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329 the entire response with the specified <literal>status</literal> to the client
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330 (0.2.0)
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331 <para>
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332 It is possible to specify either a redirect URL
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333 (for codes 301, 302, 303, 307, and 308)
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334 or the response body text (for other codes) as the second argument.
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335 </para>
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336 </tag-desc>
1840
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337 </list>
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338 </para>
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339
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340 </section>
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341
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342 </module>