Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_js_module.xml @ 2778:9cafae0b7ef3
Minor fixes in njs examples.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Thu, 14 Oct 2021 18:53:16 +0100 |
parents | a2852750c379 |
children | b6bbdce8c659 |
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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="30"> |
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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/index.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 Download and install instructions are available |
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25 <link doc="../njs/install.xml">here</link>. |
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26 </para> |
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27 |
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28 </section> |
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29 |
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30 |
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31 <section id="example" name="Example Configuration"> |
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32 |
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33 <para> |
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34 The example works since |
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35 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>. |
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36 <example> |
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37 http { |
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38 js_import http.js; |
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39 |
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40 js_set $foo http.foo; |
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41 js_set $summary http.summary; |
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42 |
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43 server { |
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44 listen 8000; |
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45 |
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46 location / { |
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47 add_header X-Foo $foo; |
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48 js_content http.baz; |
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49 } |
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50 |
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51 location = /summary { |
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52 return 200 $summary; |
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53 } |
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54 |
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55 location = /hello { |
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56 js_content http.hello; |
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57 } |
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58 } |
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59 } |
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60 </example> |
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61 </para> |
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62 |
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63 <para> |
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64 The <path>http.js</path> file: |
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65 <example> |
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66 function foo(r) { |
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67 r.log("hello from foo() handler"); |
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68 return "foo"; |
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69 } |
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70 |
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71 function summary(r) { |
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72 var a, s, h; |
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73 |
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74 s = "JS summary\n\n"; |
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75 |
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76 s += "Method: " + r.method + "\n"; |
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77 s += "HTTP version: " + r.httpVersion + "\n"; |
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78 s += "Host: " + r.headersIn.host + "\n"; |
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79 s += "Remote Address: " + r.remoteAddress + "\n"; |
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80 s += "URI: " + r.uri + "\n"; |
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81 |
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82 s += "Headers:\n"; |
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83 for (h in r.headersIn) { |
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84 s += " header '" + h + "' is '" + r.headersIn[h] + "'\n"; |
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85 } |
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86 |
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87 s += "Args:\n"; |
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88 for (a in r.args) { |
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89 s += " arg '" + a + "' is '" + r.args[a] + "'\n"; |
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90 } |
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91 |
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92 return s; |
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93 } |
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94 |
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95 function baz(r) { |
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96 r.status = 200; |
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97 r.headersOut.foo = 1234; |
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98 r.headersOut['Content-Type'] = "text/plain; charset=utf-8"; |
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99 r.headersOut['Content-Length'] = 15; |
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100 r.sendHeader(); |
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101 r.send("nginx"); |
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102 r.send("java"); |
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103 r.send("script"); |
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104 |
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105 r.finish(); |
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106 } |
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107 |
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108 function hello(r) { |
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109 r.return(200, "Hello world!"); |
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110 } |
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111 |
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112 export default {foo, summary, baz, hello}; |
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113 </example> |
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114 </para> |
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115 |
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116 </section> |
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117 |
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118 |
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119 <section id="directives" name="Directives"> |
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120 |
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121 <directive name="js_body_filter"> |
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122 <syntax><value>function</value> | <value>module.function</value> |
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123 [<value>buffer_type</value>=<value>string</value> | <value>buffer</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 <appeared-in>0.5.2</appeared-in> |
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128 |
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129 <para> |
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130 Sets an njs function as a response body filter. |
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131 The filter function is called for each data chunk of a response body |
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132 with the following arguments: |
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133 |
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134 <list type="tag"> |
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135 <tag-name><literal>r</literal></tag-name> |
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136 <tag-desc> |
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137 the <link doc="../njs/reference.xml" id="http">HTTP request</link> object |
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138 </tag-desc> |
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139 |
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140 <tag-name><literal>data</literal></tag-name> |
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141 <tag-desc> |
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142 the incoming data chunk, |
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143 may be a string or Buffer |
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144 depending on the <literal>buffer_type</literal> value, |
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145 by default is a string. |
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146 </tag-desc> |
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147 |
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148 <tag-name><literal>flags</literal></tag-name> |
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149 <tag-desc> |
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150 an object with the following properties: |
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151 <list type="tag"> |
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152 <tag-name><literal>last</literal></tag-name> |
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153 <tag-desc> |
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154 a boolean value, true if data is a last buffer. |
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155 </tag-desc> |
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156 |
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157 </list> |
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158 </tag-desc> |
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159 |
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160 </list> |
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161 </para> |
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162 |
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163 <para> |
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164 The filter function can pass its own modified version |
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165 of the input data chunk to the next body filter by calling |
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166 <link doc="../njs/reference.xml" id="r_sendbuffer"><literal>r.sendBuffer()</literal></link>. |
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167 For example, to transform all the lowercase letters in the response body: |
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168 <example> |
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169 function filter(r, data, flags) { |
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170 r.sendBuffer(data.toLowerCase(), flags); |
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171 } |
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172 </example> |
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173 To stop filtering (following data chunks will be passed to client |
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174 without calling <literal>js_body_filter</literal>), |
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175 <link doc="../njs/reference.xml" id="r_done"><literal>r.done()</literal></link> |
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176 can be used. |
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177 </para> |
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178 |
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179 <para> |
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180 If the filter function changes the length of the response body, then |
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181 it is required to clear out the <header>Content-Length</header> response header |
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182 (if any) in |
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183 <link id="js_header_filter"><literal>js_header_filter</literal></link> |
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184 to enforce chunked transfer encoding. |
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185 </para> |
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186 |
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187 </directive> |
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188 |
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189 |
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190 <directive name="js_content"> |
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191 <syntax><value>function</value> | <value>module.function</value></syntax> |
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192 <default/> |
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193 <context>location</context> |
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194 <context>limit_except</context> |
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195 |
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196 <para> |
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197 Sets an njs function as a location content handler. |
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198 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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199 a module function can be referenced. |
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200 </para> |
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201 |
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202 </directive> |
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203 |
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204 |
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205 <directive name="js_fetch_ciphers"> |
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206 <syntax><value>ciphers</value></syntax> |
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207 <default>HIGH:!aNULL:!MD5</default> |
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208 <context>http</context> |
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209 <context>server</context> |
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210 <context>location</context> |
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211 <appeared-in>0.7.0</appeared-in> |
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212 |
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213 <para> |
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214 Specifies the enabled ciphers for HTTPS requests |
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215 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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216 The ciphers are specified in the format understood by the |
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217 OpenSSL library. |
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218 </para> |
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219 |
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220 <para> |
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221 The full list can be viewed using the |
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222 “<command>openssl ciphers</command>” command. |
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223 </para> |
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224 |
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225 </directive> |
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226 |
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227 |
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228 <directive name="js_fetch_protocols"> |
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229 <syntax> |
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230 [<literal>TLSv1</literal>] |
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231 [<literal>TLSv1.1</literal>] |
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232 [<literal>TLSv1.2</literal>] |
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233 [<literal>TLSv1.3</literal>]</syntax> |
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234 <default>TLSv1 TLSv1.1 TLSv1.2</default> |
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235 <context>http</context> |
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236 <context>server</context> |
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237 <context>location</context> |
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238 <appeared-in>0.7.0</appeared-in> |
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239 |
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240 <para> |
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241 Enables the specified protocols for HTTPS requests |
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242 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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243 </para> |
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244 |
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245 </directive> |
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246 |
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247 |
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248 <directive name="js_fetch_trusted_certificate"> |
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249 <syntax><value>file</value></syntax> |
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250 <default/> |
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251 <context>http</context> |
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252 <context>server</context> |
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253 <context>location</context> |
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254 <appeared-in>0.7.0</appeared-in> |
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255 |
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256 <para> |
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257 Specifies a <value>file</value> with trusted CA certificates in the PEM format |
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258 used to |
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259 <link doc="../njs/reference.xml" id="fetch_verify">verify</link> |
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260 the HTTPS certificate |
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261 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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262 </para> |
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263 |
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264 </directive> |
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265 |
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266 |
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267 <directive name="js_fetch_verify_depth"> |
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268 <syntax><value>number</value></syntax> |
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269 <default>100</default> |
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270 <context>http</context> |
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271 <context>server</context> |
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272 <context>location</context> |
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273 <appeared-in>0.7.0</appeared-in> |
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274 |
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275 <para> |
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276 Sets the verification depth in the HTTPS server certificates chain |
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277 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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278 </para> |
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279 |
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280 </directive> |
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281 |
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282 |
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283 <directive name="js_header_filter"> |
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284 <syntax><value>function</value> | <value>module.function</value></syntax> |
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285 <default/> |
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286 <context>location</context> |
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287 <context>limit_except</context> |
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288 <appeared-in>0.5.1</appeared-in> |
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289 |
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290 <para> |
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291 Sets an njs function as a response header filter. |
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292 The directive allows changing arbitrary header fields of a response header. |
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293 </para> |
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294 |
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295 </directive> |
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296 |
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297 |
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298 <directive name="js_import"> |
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299 <syntax><value>module.js</value> | |
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300 <value>export_name from module.js</value></syntax> |
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301 <default/> |
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302 <context>http</context> |
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303 <appeared-in>0.4.0</appeared-in> |
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304 |
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305 <para> |
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306 Imports a module that implements location and variable handlers in njs. |
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307 The <literal>export_name</literal> is used as a namespace |
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308 to access module functions. |
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309 If the <literal>export_name</literal> is not specified, |
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310 the module name will be used as a namespace. |
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311 <example> |
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312 js_import http.js; |
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313 </example> |
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314 Here, the module name <literal>http</literal> is used as a namespace |
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315 while accessing exports. |
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316 If the imported module exports <literal>foo()</literal>, |
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317 <literal>http.foo</literal> is used to refer to it. |
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318 </para> |
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319 |
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320 <para> |
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321 Several <literal>js_import</literal> directives can be specified. |
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322 </para> |
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323 |
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324 </directive> |
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325 |
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326 |
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327 <directive name="js_include"> |
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328 <syntax><value>file</value></syntax> |
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329 <default/> |
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330 <context>http</context> |
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331 |
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332 <para> |
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333 Specifies a file that implements location and variable handlers in njs: |
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334 <example> |
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335 nginx.conf: |
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336 js_include http.js; |
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337 location /version { |
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338 js_content version; |
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339 } |
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340 |
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341 http.js: |
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342 function version(r) { |
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343 r.return(200, njs.version); |
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344 } |
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345 </example> |
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346 </para> |
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347 |
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348 <para> |
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349 The directive is deprecated since |
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350 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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351 the <link id="js_import"/> directive should be used instead. |
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352 </para> |
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353 |
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354 </directive> |
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355 |
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356 |
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357 <directive name="js_path"> |
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358 <syntax> |
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359 <value>path</value></syntax> |
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360 <default/> |
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361 <context>http</context> |
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362 <appeared-in>0.3.0</appeared-in> |
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363 |
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364 <para> |
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365 Sets an additional path for njs modules. |
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366 </para> |
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367 |
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368 </directive> |
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369 |
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370 |
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371 <directive name="js_set"> |
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372 <syntax> |
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373 <value>$variable</value> <value>function</value> | |
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374 <value>module.function</value></syntax> |
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375 <default/> |
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376 <context>http</context> |
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377 |
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378 <para> |
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379 Sets an njs <literal>function</literal> |
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380 for the specified <literal>variable</literal>. |
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381 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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382 a module function can be referenced. |
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383 </para> |
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384 |
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385 <para> |
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386 The function is called when |
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387 the variable is referenced for the first time for a given request. |
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388 The exact moment depends on a |
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389 <link doc="../dev/development_guide.xml" id="http_phases">phase</link> |
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390 at which the variable is referenced. |
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391 This can be used to perform some logic |
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392 not related to variable evaluation. |
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393 For example, if the variable is referenced only in the |
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394 <link doc="ngx_http_log_module.xml" id="log_format"/> directive, |
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395 its handler will not be executed until the log phase. |
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396 This handler can be used to do some cleanup |
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397 right before the request is freed. |
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398 </para> |
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399 |
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400 <para> |
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401 <note> |
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402 As the <literal>js_set</literal> handler |
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403 returns its result immediately, it supports |
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404 only synchronous callbacks. |
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405 Thus, asynchronous callbacks such as |
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406 <link doc="../njs/reference.xml" id="r_subrequest">r.subrequest()</link> |
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407 or |
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408 <link doc="../njs/reference.xml" id="settimeout">setTimeout()</link> |
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409 are not supported. |
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410 </note> |
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411 </para> |
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412 |
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413 </directive> |
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414 |
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415 |
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416 <directive name="js_var"> |
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417 <syntax><value>$variable</value> [<value>value</value>]</syntax> |
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418 <default/> |
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419 <context>http</context> |
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420 <appeared-in>0.5.3</appeared-in> |
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421 |
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422 <para> |
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423 Declares |
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424 a <link doc="../njs/reference.xml" id="r_variables">writable</link> |
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425 variable. |
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426 The value can contain text, variables, and their combination. |
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427 The variable is not overwritten after a redirect |
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428 unlike variables created with the |
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429 <link doc="ngx_http_rewrite_module.xml" id="set"/> directive. |
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430 </para> |
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431 |
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432 </directive> |
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433 |
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434 </section> |
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435 |
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436 |
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437 <section id="arguments" name="Request Argument"> |
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438 |
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439 <para> |
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440 Each HTTP njs handler receives one argument, a request |
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441 <link doc="../njs/reference.xml" id="http">object</link>. |
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442 </para> |
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443 |
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444 </section> |
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445 |
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446 </module> |