Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_js_module.xml @ 2966:f04c62f0524e
nginx-1.25.0
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 23 May 2023 18:21:28 +0300 |
parents | 9719a0184a67 |
children | 7e83ebfac8ca |
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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="37"> |
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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 js_set $hash http.hash; |
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43 |
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44 resolver 10.0.0.1; |
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45 |
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46 server { |
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47 listen 8000; |
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48 |
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49 location / { |
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50 add_header X-Foo $foo; |
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51 js_content http.baz; |
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52 } |
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53 |
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54 location = /summary { |
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55 return 200 $summary; |
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56 } |
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57 |
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58 location = /hello { |
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59 js_content http.hello; |
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60 } |
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61 |
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62 # since 0.7.0 |
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63 location = /fetch { |
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64 js_content http.fetch; |
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65 js_fetch_trusted_certificate /path/to/ISRG_Root_X1.pem; |
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66 } |
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67 |
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68 # since 0.7.0 |
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69 location = /crypto { |
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70 add_header Hash $hash; |
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71 return 200; |
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72 } |
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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(r) { |
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82 r.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(r) { |
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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: " + r.method + "\n"; |
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92 s += "HTTP version: " + r.httpVersion + "\n"; |
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93 s += "Host: " + r.headersIn.host + "\n"; |
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94 s += "Remote Address: " + r.remoteAddress + "\n"; |
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95 s += "URI: " + r.uri + "\n"; |
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96 |
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97 s += "Headers:\n"; |
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98 for (h in r.headersIn) { |
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99 s += " header '" + h + "' is '" + r.headersIn[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 r.args) { |
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104 s += " arg '" + a + "' is '" + r.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(r) { |
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111 r.status = 200; |
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112 r.headersOut.foo = 1234; |
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113 r.headersOut['Content-Type'] = "text/plain; charset=utf-8"; |
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114 r.headersOut['Content-Length'] = 15; |
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115 r.sendHeader(); |
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116 r.send("nginx"); |
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117 r.send("java"); |
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118 r.send("script"); |
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119 |
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120 r.finish(); |
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121 } |
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122 |
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123 function hello(r) { |
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124 r.return(200, "Hello world!"); |
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125 } |
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126 |
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127 // since 0.7.0 |
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128 async function fetch(r) { |
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129 let results = await Promise.all([ngx.fetch('https://nginx.org/'), |
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130 ngx.fetch('https://nginx.org/en/')]); |
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131 |
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132 r.return(200, JSON.stringify(results, undefined, 4)); |
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133 } |
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134 |
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135 // since 0.7.0 |
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136 async function hash(r) { |
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137 let hash = await crypto.subtle.digest('SHA-512', r.headersIn.host); |
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138 r.setReturnValue(Buffer.from(hash).toString('hex')); |
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139 } |
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140 |
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141 export default {foo, summary, baz, hello, fetch, hash}; |
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142 </example> |
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143 </para> |
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144 |
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145 </section> |
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146 |
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147 |
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148 <section id="directives" name="Directives"> |
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149 |
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150 <directive name="js_body_filter"> |
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151 <syntax><value>function</value> | <value>module.function</value> |
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152 [<value>buffer_type</value>=<value>string</value> | <value>buffer</value>]</syntax> |
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153 <default/> |
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154 <context>location</context> |
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155 <context>if in location</context> |
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156 <context>limit_except</context> |
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157 <appeared-in>0.5.2</appeared-in> |
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158 |
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159 <para> |
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160 Sets an njs function as a response body filter. |
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161 The filter function is called for each data chunk of a response body |
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162 with the following arguments: |
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163 |
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164 <list type="tag"> |
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165 <tag-name><literal>r</literal></tag-name> |
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166 <tag-desc> |
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167 the <link doc="../njs/reference.xml" id="http">HTTP request</link> object |
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168 </tag-desc> |
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169 |
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170 <tag-name><literal>data</literal></tag-name> |
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171 <tag-desc> |
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172 the incoming data chunk, |
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173 may be a string or Buffer |
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174 depending on the <literal>buffer_type</literal> value, |
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175 by default is a string. |
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176 </tag-desc> |
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177 |
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178 <tag-name><literal>flags</literal></tag-name> |
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179 <tag-desc> |
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180 an object with the following properties: |
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181 <list type="tag"> |
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182 <tag-name><literal>last</literal></tag-name> |
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183 <tag-desc> |
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184 a boolean value, true if data is a last buffer. |
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185 </tag-desc> |
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186 |
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187 </list> |
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188 </tag-desc> |
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189 |
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190 </list> |
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191 </para> |
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192 |
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193 <para> |
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194 The filter function can pass its own modified version |
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195 of the input data chunk to the next body filter by calling |
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196 <link doc="../njs/reference.xml" id="r_sendbuffer"><literal>r.sendBuffer()</literal></link>. |
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197 For example, to transform all the lowercase letters in the response body: |
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198 <example> |
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199 function filter(r, data, flags) { |
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200 r.sendBuffer(data.toLowerCase(), flags); |
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201 } |
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202 </example> |
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203 To stop filtering (following data chunks will be passed to client |
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204 without calling <literal>js_body_filter</literal>), |
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205 <link doc="../njs/reference.xml" id="r_done"><literal>r.done()</literal></link> |
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206 can be used. |
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207 </para> |
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208 |
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209 <para> |
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210 If the filter function changes the length of the response body, then |
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211 it is required to clear out the <header>Content-Length</header> response header |
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212 (if any) in |
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213 <link id="js_header_filter"><literal>js_header_filter</literal></link> |
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214 to enforce chunked transfer encoding. |
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215 </para> |
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216 |
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217 <para> |
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218 <note> |
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219 As the <literal>js_body_filter</literal> handler |
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220 returns its result immediately, it supports |
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221 only synchronous operations. |
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222 Thus, asynchronous operations such as |
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223 <link doc="../njs/reference.xml" id="r_subrequest">r.subrequest()</link> |
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224 or |
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225 <link doc="../njs/reference.xml" id="settimeout">setTimeout()</link> |
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226 are not supported. |
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227 </note> |
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228 </para> |
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229 |
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230 <para> |
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231 <note> |
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232 The directive can be specified inside the |
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233 <link doc="../http/ngx_http_rewrite_module.xml" id="if">if</link> block |
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234 since <link doc="../njs/changes.xml" id="njs0.7.7">0.7.7</link>. |
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235 </note> |
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236 </para> |
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237 |
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238 </directive> |
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239 |
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240 |
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241 <directive name="js_content"> |
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242 <syntax><value>function</value> | <value>module.function</value></syntax> |
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243 <default/> |
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244 <context>location</context> |
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245 <context>if in location</context> |
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246 <context>limit_except</context> |
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247 |
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248 <para> |
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249 Sets an njs function as a location content handler. |
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250 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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251 a module function can be referenced. |
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252 </para> |
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253 |
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254 <para> |
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255 <note> |
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256 The directive can be specified inside the |
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257 <link doc="../http/ngx_http_rewrite_module.xml" id="if">if</link> block |
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258 since <link doc="../njs/changes.xml" id="njs0.7.7">0.7.7</link>. |
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259 </note> |
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260 </para> |
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261 |
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262 </directive> |
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263 |
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264 |
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265 <directive name="js_fetch_buffer_size"> |
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266 <syntax><value>size</value></syntax> |
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267 <default>16k</default> |
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268 <context>http</context> |
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269 <context>server</context> |
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270 <context>location</context> |
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271 <appeared-in>0.7.4</appeared-in> |
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272 |
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273 <para> |
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274 Sets the <value>size</value> of the buffer used for reading and writing |
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275 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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276 </para> |
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277 |
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278 </directive> |
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279 |
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280 |
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281 <directive name="js_fetch_ciphers"> |
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282 <syntax><value>ciphers</value></syntax> |
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283 <default>HIGH:!aNULL:!MD5</default> |
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284 <context>http</context> |
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285 <context>server</context> |
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286 <context>location</context> |
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287 <appeared-in>0.7.0</appeared-in> |
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288 |
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289 <para> |
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290 Specifies the enabled ciphers for HTTPS requests |
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291 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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292 The ciphers are specified in the format understood by the |
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293 OpenSSL library. |
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294 </para> |
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295 |
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296 <para> |
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297 The full list can be viewed using the |
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298 “<command>openssl ciphers</command>” command. |
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299 </para> |
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300 |
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301 </directive> |
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302 |
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303 |
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304 <directive name="js_fetch_max_response_buffer_size"> |
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305 <syntax><value>size</value></syntax> |
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306 <default>1m</default> |
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307 <context>http</context> |
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308 <context>server</context> |
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309 <context>location</context> |
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310 <appeared-in>0.7.4</appeared-in> |
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311 |
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312 <para> |
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313 Sets the maximum <value>size</value> of the response received |
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314 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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315 </para> |
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316 |
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317 </directive> |
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318 |
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319 |
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320 <directive name="js_fetch_protocols"> |
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321 <syntax> |
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322 [<literal>TLSv1</literal>] |
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323 [<literal>TLSv1.1</literal>] |
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324 [<literal>TLSv1.2</literal>] |
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325 [<literal>TLSv1.3</literal>]</syntax> |
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326 <default>TLSv1 TLSv1.1 TLSv1.2</default> |
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327 <context>http</context> |
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328 <context>server</context> |
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329 <context>location</context> |
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330 <appeared-in>0.7.0</appeared-in> |
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331 |
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332 <para> |
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333 Enables the specified protocols for HTTPS requests |
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334 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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335 </para> |
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336 |
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337 </directive> |
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338 |
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339 |
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340 <directive name="js_fetch_timeout"> |
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341 <syntax><value>time</value></syntax> |
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342 <default>60s</default> |
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343 <context>http</context> |
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344 <context>server</context> |
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345 <context>location</context> |
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346 <appeared-in>0.7.4</appeared-in> |
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347 |
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348 <para> |
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349 Defines a timeout for reading and writing |
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350 for <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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351 The timeout is set only between two successive read/write operations, |
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352 not for the whole response. |
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353 If no data is transmitted within this time, the connection is closed. |
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354 </para> |
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355 |
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356 </directive> |
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357 |
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358 |
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359 <directive name="js_fetch_trusted_certificate"> |
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360 <syntax><value>file</value></syntax> |
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361 <default/> |
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362 <context>http</context> |
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363 <context>server</context> |
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364 <context>location</context> |
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365 <appeared-in>0.7.0</appeared-in> |
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366 |
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367 <para> |
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368 Specifies a <value>file</value> with trusted CA certificates in the PEM format |
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369 used to |
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370 <link doc="../njs/reference.xml" id="fetch_verify">verify</link> |
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371 the HTTPS certificate |
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372 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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373 </para> |
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374 |
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375 </directive> |
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376 |
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377 |
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378 <directive name="js_fetch_verify"> |
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379 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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380 <default>on</default> |
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381 <context>http</context> |
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382 <context>server</context> |
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383 <context>location</context> |
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384 <appeared-in>0.7.4</appeared-in> |
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385 |
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386 <para> |
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387 Enables or disables verification of the HTTPS server certificate |
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388 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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389 </para> |
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390 |
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391 </directive> |
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392 |
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393 |
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394 <directive name="js_fetch_verify_depth"> |
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395 <syntax><value>number</value></syntax> |
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396 <default>100</default> |
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397 <context>http</context> |
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398 <context>server</context> |
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399 <context>location</context> |
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400 <appeared-in>0.7.0</appeared-in> |
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401 |
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402 <para> |
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403 Sets the verification depth in the HTTPS server certificates chain |
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404 with <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>. |
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405 </para> |
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406 |
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407 </directive> |
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408 |
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409 |
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410 <directive name="js_header_filter"> |
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411 <syntax><value>function</value> | <value>module.function</value></syntax> |
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412 <default/> |
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413 <context>location</context> |
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414 <context>if in location</context> |
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415 <context>limit_except</context> |
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416 <appeared-in>0.5.1</appeared-in> |
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417 |
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418 <para> |
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419 Sets an njs function as a response header filter. |
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420 The directive allows changing arbitrary header fields of a response header. |
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421 </para> |
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422 |
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423 <para> |
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424 <note> |
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425 As the <literal>js_header_filter</literal> handler |
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426 returns its result immediately, it supports |
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427 only synchronous operations. |
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428 Thus, asynchronous operations such as |
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429 <link doc="../njs/reference.xml" id="r_subrequest">r.subrequest()</link> |
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430 or |
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431 <link doc="../njs/reference.xml" id="settimeout">setTimeout()</link> |
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432 are not supported. |
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433 </note> |
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434 </para> |
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435 |
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436 <para> |
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437 <note> |
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438 The directive can be specified inside the |
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439 <link doc="../http/ngx_http_rewrite_module.xml" id="if">if</link> block |
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440 since <link doc="../njs/changes.xml" id="njs0.7.7">0.7.7</link>. |
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441 </note> |
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442 </para> |
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443 |
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444 </directive> |
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445 |
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446 |
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447 <directive name="js_import"> |
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448 <syntax><value>module.js</value> | |
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449 <value>export_name from module.js</value></syntax> |
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450 <default/> |
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451 <context>http</context> |
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452 <context>server</context> |
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453 <context>location</context> |
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454 <appeared-in>0.4.0</appeared-in> |
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455 |
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456 <para> |
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457 Imports a module that implements location and variable handlers in njs. |
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458 The <literal>export_name</literal> is used as a namespace |
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459 to access module functions. |
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460 If the <literal>export_name</literal> is not specified, |
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461 the module name will be used as a namespace. |
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462 <example> |
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463 js_import http.js; |
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464 </example> |
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465 Here, the module name <literal>http</literal> is used as a namespace |
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|
466 while accessing exports. |
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|
467 If the imported module exports <literal>foo()</literal>, |
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468 <literal>http.foo</literal> is used to refer to it. |
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469 </para> |
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|
470 |
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|
471 <para> |
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Documented the js_import directive and corresponding changes.
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472 Several <literal>js_import</literal> directives can be specified. |
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473 </para> |
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|
474 |
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475 <para> |
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476 <note> |
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|
477 The directive can be specified on the |
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|
478 <literal>server</literal> and <literal>location</literal> level |
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|
479 since <link doc="../njs/changes.xml" id="njs0.7.7">0.7.7</link>. |
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|
480 </note> |
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|
481 </para> |
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|
482 |
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483 </directive> |
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diff
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|
484 |
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|
485 |
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486 <directive name="js_include"> |
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487 <syntax><value>file</value></syntax> |
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488 <default/> |
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489 <context>http</context> |
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|
490 |
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491 <para> |
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492 Specifies a file that implements location and variable handlers in njs: |
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493 <example> |
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494 nginx.conf: |
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495 js_include http.js; |
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496 location /version { |
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497 js_content version; |
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498 } |
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|
499 |
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|
500 http.js: |
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|
501 function version(r) { |
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Documented the js_import directive and corresponding changes.
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|
502 r.return(200, njs.version); |
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503 } |
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parents:
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|
504 </example> |
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505 </para> |
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Documented the js_import directive and corresponding changes.
Yaroslav Zhuravlev <yar@nginx.com>
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|
506 |
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Documented the js_import directive and corresponding changes.
Yaroslav Zhuravlev <yar@nginx.com>
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|
507 <para> |
2823
652356b39f0f
Added info about removal of the js_import directive.
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508 The directive was made obsolete in version |
652356b39f0f
Added info about removal of the js_import directive.
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|
509 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link> |
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Added info about removal of the js_import directive.
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|
510 and was removed in version |
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Added info about removal of the js_import directive.
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diff
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|
511 <link doc="../njs/changes.xml" id="njs0.7.1">0.7.1</link>. |
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parents:
2787
diff
changeset
|
512 The <link id="js_import"/> directive should be used instead. |
2142
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|
513 </para> |
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Ruslan Ermilov <ru@nginx.com>
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diff
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|
514 |
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Ruslan Ermilov <ru@nginx.com>
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diff
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|
515 </directive> |
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parents:
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diff
changeset
|
516 |
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Sorted directives alphabetically.
Ruslan Ermilov <ru@nginx.com>
parents:
2135
diff
changeset
|
517 |
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Documented the js_path directive.
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parents:
2246
diff
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|
518 <directive name="js_path"> |
1101e24c6d14
Documented the js_path directive.
Yaroslav Zhuravlev <yar@nginx.com>
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|
519 <syntax> |
1101e24c6d14
Documented the js_path directive.
Yaroslav Zhuravlev <yar@nginx.com>
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changeset
|
520 <value>path</value></syntax> |
1101e24c6d14
Documented the js_path directive.
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diff
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|
521 <default/> |
1101e24c6d14
Documented the js_path directive.
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parents:
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diff
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|
522 <context>http</context> |
2882
986e1f930e3b
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parents:
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diff
changeset
|
523 <context>server</context> |
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parents:
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diff
changeset
|
524 <context>location</context> |
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Documented the js_path directive.
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diff
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|
525 <appeared-in>0.3.0</appeared-in> |
1101e24c6d14
Documented the js_path directive.
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diff
changeset
|
526 |
1101e24c6d14
Documented the js_path directive.
Yaroslav Zhuravlev <yar@nginx.com>
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diff
changeset
|
527 <para> |
1101e24c6d14
Documented the js_path directive.
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diff
changeset
|
528 Sets an additional path for njs modules. |
1101e24c6d14
Documented the js_path directive.
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diff
changeset
|
529 </para> |
1101e24c6d14
Documented the js_path directive.
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diff
changeset
|
530 |
2882
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parents:
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diff
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|
531 <para> |
986e1f930e3b
Documented server, location, if contexts for some js directives.
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parents:
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|
532 <note> |
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Documented server, location, if contexts for some js directives.
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parents:
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diff
changeset
|
533 The directive can be specified on the |
986e1f930e3b
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diff
changeset
|
534 <literal>server</literal> and <literal>location</literal> level |
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parents:
2845
diff
changeset
|
535 since <link doc="../njs/changes.xml" id="njs0.7.7">0.7.7</link>. |
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parents:
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diff
changeset
|
536 </note> |
986e1f930e3b
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parents:
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diff
changeset
|
537 </para> |
986e1f930e3b
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parents:
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diff
changeset
|
538 |
2352
1101e24c6d14
Documented the js_path directive.
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parents:
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diff
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|
539 </directive> |
1101e24c6d14
Documented the js_path directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2246
diff
changeset
|
540 |
1101e24c6d14
Documented the js_path directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2246
diff
changeset
|
541 |
2901
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
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|
542 <directive name="js_preload_object"> |
9719a0184a67
Documented the js_preload_object directive.
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diff
changeset
|
543 <syntax><value>name.json</value> | |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
544 <value>name</value> from <value>file.json</value></syntax> |
9719a0184a67
Documented the js_preload_object directive.
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parents:
2882
diff
changeset
|
545 <default/> |
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Documented the js_preload_object directive.
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parents:
2882
diff
changeset
|
546 <context>http</context> |
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Documented the js_preload_object directive.
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parents:
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diff
changeset
|
547 <context>server</context> |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
548 <context>location</context> |
9719a0184a67
Documented the js_preload_object directive.
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parents:
2882
diff
changeset
|
549 <appeared-in>0.7.8</appeared-in> |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
550 |
9719a0184a67
Documented the js_preload_object directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2882
diff
changeset
|
551 <para> |
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Documented the js_preload_object directive.
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parents:
2882
diff
changeset
|
552 Preloads an immutable object at configure time. |
9719a0184a67
Documented the js_preload_object directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
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diff
changeset
|
553 The <literal>name</literal> is used a name of the global variable |
9719a0184a67
Documented the js_preload_object directive.
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parents:
2882
diff
changeset
|
554 though which the object is available in njs code. |
9719a0184a67
Documented the js_preload_object directive.
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parents:
2882
diff
changeset
|
555 If the <literal>name</literal> is not specified, |
9719a0184a67
Documented the js_preload_object directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2882
diff
changeset
|
556 the file name will be used instead. |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
557 <example> |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
558 js_preload_object map.json; |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
559 </example> |
9719a0184a67
Documented the js_preload_object directive.
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parents:
2882
diff
changeset
|
560 Here, the <literal>map</literal> is used as a name |
9719a0184a67
Documented the js_preload_object directive.
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parents:
2882
diff
changeset
|
561 while accessing the preloaded object. |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
562 </para> |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
563 |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
564 <para> |
9719a0184a67
Documented the js_preload_object directive.
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parents:
2882
diff
changeset
|
565 Several <literal>js_preload_object</literal> directives can be specified. |
9719a0184a67
Documented the js_preload_object directive.
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parents:
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diff
changeset
|
566 </para> |
9719a0184a67
Documented the js_preload_object directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2882
diff
changeset
|
567 |
9719a0184a67
Documented the js_preload_object directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2882
diff
changeset
|
568 </directive> |
9719a0184a67
Documented the js_preload_object directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
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diff
changeset
|
569 |
9719a0184a67
Documented the js_preload_object directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
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diff
changeset
|
570 |
1840
15632fc2d548
Documented http and stream nginScript modules.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff
changeset
|
571 <directive name="js_set"> |
15632fc2d548
Documented http and stream nginScript modules.
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parents:
diff
changeset
|
572 <syntax> |
2530
407c5bd5bffc
Documented the js_import directive and corresponding changes.
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parents:
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diff
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|
573 <value>$variable</value> <value>function</value> | |
407c5bd5bffc
Documented the js_import directive and corresponding changes.
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parents:
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diff
changeset
|
574 <value>module.function</value></syntax> |
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15632fc2d548
Documented http and stream nginScript modules.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff
changeset
|
575 <default/> |
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Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff
changeset
|
576 <context>http</context> |
2882
986e1f930e3b
Documented server, location, if contexts for some js directives.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2845
diff
changeset
|
577 <context>server</context> |
986e1f930e3b
Documented server, location, if contexts for some js directives.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2845
diff
changeset
|
578 <context>location</context> |
1840
15632fc2d548
Documented http and stream nginScript modules.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff
changeset
|
579 |
15632fc2d548
Documented http and stream nginScript modules.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff
changeset
|
580 <para> |
2686
45214e5316cd
Improved description of js_set.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2680
diff
changeset
|
581 Sets an njs <literal>function</literal> |
45214e5316cd
Improved description of js_set.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2680
diff
changeset
|
582 for the specified <literal>variable</literal>. |
2530
407c5bd5bffc
Documented the js_import directive and corresponding changes.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
2352
diff
changeset
|
583 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
407c5bd5bffc
Documented the js_import directive and corresponding changes.
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parents:
2352
diff
changeset
|
584 a module function can be referenced. |
1840
15632fc2d548
Documented http and stream nginScript modules.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
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585 </para> |
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586 |
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587 <para> |
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588 The function is called when |
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589 the variable is referenced for the first time for a given request. |
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590 The exact moment depends on a |
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591 <link doc="../dev/development_guide.xml" id="http_phases">phase</link> |
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592 at which the variable is referenced. |
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593 This can be used to perform some logic |
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594 not related to variable evaluation. |
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595 For example, if the variable is referenced only in the |
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596 <link doc="ngx_http_log_module.xml" id="log_format"/> directive, |
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597 its handler will not be executed until the log phase. |
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598 This handler can be used to do some cleanup |
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599 right before the request is freed. |
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600 </para> |
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601 |
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602 <para> |
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603 <note> |
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604 As the <literal>js_set</literal> handler |
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605 returns its result immediately, it supports |
2787
005b056c267f
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606 only synchronous operations. |
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607 Thus, asynchronous operations such as |
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608 <link doc="../njs/reference.xml" id="r_subrequest">r.subrequest()</link> |
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|
609 or |
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|
610 <link doc="../njs/reference.xml" id="settimeout">setTimeout()</link> |
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611 are not supported. |
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612 </note> |
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613 </para> |
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|
614 |
2882
986e1f930e3b
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615 <para> |
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616 <note> |
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617 The directive can be specified on the |
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618 <literal>server</literal> and <literal>location</literal> level |
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|
619 since <link doc="../njs/changes.xml" id="njs0.7.7">0.7.7</link>. |
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620 </note> |
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621 </para> |
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622 |
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623 </directive> |
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624 |
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625 |
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626 <directive name="js_var"> |
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627 <syntax><value>$variable</value> [<value>value</value>]</syntax> |
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628 <default/> |
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629 <context>http</context> |
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630 <context>server</context> |
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631 <context>location</context> |
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632 <appeared-in>0.5.3</appeared-in> |
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633 |
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634 <para> |
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635 Declares |
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636 a <link doc="../njs/reference.xml" id="r_variables">writable</link> |
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637 variable. |
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638 The value can contain text, variables, and their combination. |
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639 The variable is not overwritten after a redirect |
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640 unlike variables created with the |
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641 <link doc="ngx_http_rewrite_module.xml" id="set"/> directive. |
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642 </para> |
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643 |
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644 <para> |
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645 <note> |
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646 The directive can be specified on the |
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647 <literal>server</literal> and <literal>location</literal> level |
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648 since <link doc="../njs/changes.xml" id="njs0.7.7">0.7.7</link>. |
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649 </note> |
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|
650 </para> |
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Documented server, location, if contexts for some js directives.
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parents:
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diff
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|
651 |
2693
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|
652 </directive> |
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diff
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|
653 |
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diff
changeset
|
654 </section> |
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parents:
diff
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|
655 |
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diff
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|
656 |
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Updated HTTP njs module according to njs 0.2.2.
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|
657 <section id="arguments" name="Request Argument"> |
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Added new njs HTTP properties and methods.
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658 |
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Added new njs HTTP properties and methods.
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|
659 <para> |
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|
660 Each HTTP njs handler receives one argument, a request |
2246
32ba43abf9cd
Renamed njs API, njs Changes.
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|
661 <link doc="../njs/reference.xml" id="http">object</link>. |
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|
662 </para> |
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diff
changeset
|
663 |
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|
664 </section> |
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|
665 |
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diff
changeset
|
666 </module> |