Mercurial > hg > nginx-site

annotate xml/en/docs/http/ngx_http_js_module.xml @ 1853:8868945bbe97

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Use non-breakable space before the "em" dash.
author Ruslan Ermilov <ru@nginx.com>
date Fri, 09 Dec 2016 15:48:12 +0300
parents bfac366fa1e4
children 36cbfff92c6d
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="3">
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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">nginScript</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 nginScript 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 nginScript 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="issues" name="Known Issues">
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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 </section>
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53
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54
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55 <section id="example" name="Example Configuration">
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56
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57 <para>
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58 <example>
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59 js_include http.js;
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60
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61 server {
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62 listen 8000;
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63
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64 location / {
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65 js_set $foo foo;
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66 add_header X-Foo $foo;
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67 js_content baz;
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68 }
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69
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70 location /summary {
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71 js_set $summary summary;
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72 return 200 $summary;
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73 }
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74 }
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75 </example>
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76 </para>
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77
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78 <para>
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79 The <path>http.js</path> file:
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80 <example>
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81 function foo(req, res) {
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82 req.log("hello from foo() handler");
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83 return "foo";
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84 }
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85
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86 function summary(req, res) {
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87 var a, s, h;
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88
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89 s = "JS summary\n\n";
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90
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91 s += "Method: " + req.method + "\n";
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92 s += "HTTP version: " + req.httpVersion + "\n";
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93 s += "Host: " + req.headers.host + "\n";
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94 s += "Remote Address: " + req.remoteAddress + "\n";
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95 s += "URI: " + req.uri + "\n";
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96
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97 s += "Headers:\n";
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98 for (h in req.headers) {
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99 s += " header '" + h + "' is '" + req.headers[h] + "'\n";
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100 }
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101
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102 s += "Args:\n";
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103 for (a in req.args) {
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104 s += " arg '" + a + "' is '" + req.args[a] + "'\n";
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105 }
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106
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107 return s;
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108 }
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109
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110 function baz(req, res) {
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111 res.headers.foo = 1234;
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112 res.status = 200;
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113 res.contentType = "text/plain; charset=utf-8";
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114 res.contentLength = 15;
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115 res.sendHeader();
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116 res.send("nginx");
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117 res.send("java");
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118 res.send("script");
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119
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120 res.finish();
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121 }
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122 </example>
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123 </para>
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124
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125 </section>
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126
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127
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128 <section id="directives" name="Directives">
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129
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130 <directive name="js_include">
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131 <syntax><value>file</value></syntax>
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132 <default/>
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133 <context>http</context>
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134 <context>server</context>
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135 <context>location</context>
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136
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137 <para>
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138 Specifies a file that implements location and variable handlers in nginScript.
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139 </para>
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140
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141 </directive>
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142
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143
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144 <directive name="js_content">
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145 <syntax><value>function</value></syntax>
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146 <default/>
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147 <context>location</context>
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148 <context>limit_except</context>
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149
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150 <para>
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151 Sets an nginScript function as a location content handler.
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152 </para>
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153
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154 </directive>
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155
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156
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157 <directive name="js_set">
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158 <syntax>
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159 <value>$variable</value> <value>function</value></syntax>
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160 <default/>
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161 <context>http</context>
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162 <context>server</context>
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163 <context>location</context>
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164
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165 <para>
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166 Sets an nginScript function for the specified variable.
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167 </para>
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168
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169 </directive>
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170
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171 </section>
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172
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173
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174 <section id="arguments" name="Request and Response Arguments">
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175 <para>
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176 Each HTTP nginScript handler receives two arguments, request and response.
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177 </para>
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178
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179 <para>
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180 The request object has the following properties:
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181 <list type="tag">
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182
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183 <tag-name><literal>uri</literal></tag-name>
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184 <tag-desc>
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185 current URI in a request, read-only
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186 </tag-desc>
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187
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188 <tag-name><literal>method</literal></tag-name>
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189 <tag-desc>
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190 request method, read-only
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191 </tag-desc>
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192
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193 <tag-name><literal>httpVersion</literal></tag-name>
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194 <tag-desc>
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195 HTTP version, read-only
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196 </tag-desc>
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197
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198 <tag-name><literal>remoteAddress</literal></tag-name>
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199 <tag-desc>
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200 client address, read-only
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201 </tag-desc>
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202
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203 <tag-name><literal>headers{}</literal></tag-name>
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204 <tag-desc>
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205 request headers object, read-only.
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206 <para>
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207 For example, the <literal>Header-Name</literal> header
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208 can be accessed with the syntax <literal>headers['Header-Name']</literal>
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209 or <literal>headers.Header_name</literal>
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210 </para>
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211 </tag-desc>
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212
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213 <tag-name><literal>args{}</literal></tag-name>
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214 <tag-desc>
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215 request arguments object, read-only
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216 </tag-desc>
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217
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218 <tag-name><literal>variables{}</literal></tag-name>
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219 <tag-desc>
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220 nginx variables object, read-only
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221 </tag-desc>
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222
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223 <tag-name><literal>log(<value>string</value>)</literal></tag-name>
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224 <tag-desc>
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225 writes a <literal>string</literal> to the error log
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226 </tag-desc>
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227 </list>
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228 </para>
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229
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230 <para>
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231 The response object has the following properties:
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232 <list type="tag">
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233
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234 <tag-name><literal>status</literal></tag-name>
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235 <tag-desc>
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236 response status, writable
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237 </tag-desc>
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238
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239 <tag-name><literal>headers{}</literal></tag-name>
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240 <tag-desc>
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241 response headers object
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242 </tag-desc>
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243
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244 <tag-name><literal>contentType</literal></tag-name>
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245 <tag-desc>
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246 the response <header>Content-Type</header> header field value, writable
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247 </tag-desc>
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248
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249 <tag-name><literal>contentLength</literal></tag-name>
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250 <tag-desc>
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251 the response <header>Content-Length</header> header field value, writable
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252 </tag-desc>
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253 </list>
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254 </para>
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255
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256 <para>
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257 The response object has the following methods:
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258 <list type="tag">
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259
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260 <tag-name><literal>sendHeader()</literal></tag-name>
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261 <tag-desc>
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262 sends the HTTP header to the client
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263 </tag-desc>
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264
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265 <tag-name><literal>send(<value>string</value>)</literal></tag-name>
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266 <tag-desc>
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267 sends a part of the response body to the client
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268 </tag-desc>
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269
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270 <tag-name><literal>finish()</literal></tag-name>
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271 <tag-desc>
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272 finishes sending a response to the client
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273 </tag-desc>
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274 </list>
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275 </para>
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276
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277 </section>
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278
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279 </module>