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annotate xml/ru/docs/http/ngx_http_js_module.xml @ 2773:a2852750c379

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Added fetch directives to js http and stream modules.
author Yaroslav Zhuravlev <yar@nginx.com>
date Thu, 14 Oct 2021 18:53:16 +0100
parents 42fb92e582db
children b6bbdce8c659
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Nginx, Inc.
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5 -->
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6
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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8
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9 <module name="Модуль ngx_http_js_module"
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10 link="/ru/docs/http/ngx_http_js_module.html"
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11 lang="ru"
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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 Модуль <literal>ngx_http_js_module</literal> позволяет задавать
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18 обработчики location и переменных
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19 на <link doc="../njs/index.xml">njs</link> —
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20 подмножестве языка JavaScript.
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21 </para>
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22
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23 <para>
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24 Инструкция по сборке и установке доступны
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25 <link doc="../njs/install.xml">здесь</link>.
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26 </para>
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27
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28 </section>
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31 <section id="example" name="Пример конфигурации">
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32
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33 <para>
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34 Пример работает начиная с версии
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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="Директивы">
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120
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121 <directive name="js_body_filter">
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122 <syntax><value>функция</value> | <value>модуль.функция</value>
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123 [<value>buffer_type</value>=<value>строка</value> | <value>буфер</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 Задаёт функцию njs в качестве фильтра тела ответа.
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131 Функция фильтра вызывается для каждого блока данных тела ответа
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132 со следующими аргументами:
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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 объект <link doc="../njs/reference.xml" id="http">HTTP request</link>
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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 входящий блок данных
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143 может быть строкой или буфером
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144 в зависимости от значения <literal>buffer_type</literal>,
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145 по умолчанию является строкой.
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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 объект со следующими свойствами:
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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 логическое значение, true, если данные являются последним буфером.
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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 Функция фильтра может передавать свою модифицированную версию
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165 входящего блока данных следующему фильтру тела ответа при помощи вызова
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166 <link doc="../njs/reference.xml" id="r_sendbuffer"><literal>r.sendBuffer()</literal></link>.
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167 Пример преобразования букв в нижний регистр в теле ответа:
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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 Для отмены фильтра (блоки данных будут передаваться клиенту
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174 без вызова <literal>js_body_filter</literal>),
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175 можно использовать
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176 <link doc="../njs/reference.xml" id="r_done"><literal>r.done()</literal></link>.
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177 </para>
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178
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179 <para>
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180 Если функция фильтра изменяет длину тела ответа, то
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181 необходимо очистить заголовок ответа <header>Content-Length</header>
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182 (если присутствует) в
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183 <link id="js_header_filter"><literal>js_header_filter</literal></link>,
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184 чтобы применить поблочное кодирование.
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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>функция</value> | <value>модуль.функция</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 Задаёт функцию njs в качестве обработчика содержимого location.
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198 Начиная с версии <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>
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199 можно ссылаться на функцию модуля.
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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>шифры</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 Описывает разрешённые шифры для HTTPS-запросов
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215 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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216 Шифры задаются в формате, поддерживаемом библиотекой OpenSSL.
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217 </para>
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218
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219 <para>
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220 Полный список можно посмотреть с помощью команды
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221 “<command>openssl ciphers</command>”.
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222 </para>
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223
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224 </directive>
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225
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226
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227 <directive name="js_fetch_protocols">
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228 <syntax>
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229 [<literal>TLSv1</literal>]
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230 [<literal>TLSv1.1</literal>]
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231 [<literal>TLSv1.2</literal>]
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232 [<literal>TLSv1.3</literal>]</syntax>
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233 <default>TLSv1 TLSv1.1 TLSv1.2</default>
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234 <context>http</context>
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235 <context>server</context>
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236 <context>location</context>
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237 <appeared-in>0.7.0</appeared-in>
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238
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239 <para>
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240 Разрешает указанные протоколы для HTTPS-запросов
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241 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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242 </para>
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243
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244 </directive>
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245
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246
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247 <directive name="js_fetch_trusted_certificate">
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248 <syntax><value>файл</value></syntax>
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249 <default/>
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250 <context>http</context>
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251 <context>server</context>
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252 <context>location</context>
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253 <appeared-in>0.7.0</appeared-in>
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254
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255 <para>
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256 Задаёт <value>файл</value> с доверенными сертификатами CA в формате PEM,
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257 используемыми при
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258 <link doc="../njs/reference.xml" id="fetch_verify">проверке</link>
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259 HTTPS-сертификата
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260 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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261 </para>
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262
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263 </directive>
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264
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265
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266 <directive name="js_fetch_verify_depth">
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267 <syntax><value>число</value></syntax>
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268 <default>100</default>
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269 <context>http</context>
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270 <context>server</context>
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271 <context>location</context>
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272 <appeared-in>0.7.0</appeared-in>
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273
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274 <para>
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275 Устанавливает глубину проверки в цепочке HTTPS-сертификатов
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276 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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277 </para>
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278
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279 </directive>
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280
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281
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282 <directive name="js_header_filter">
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283 <syntax><value>функция</value> | <value>модуль.функция</value></syntax>
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284 <default/>
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285 <context>location</context>
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286 <context>limit_except</context>
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287 <appeared-in>0.5.1</appeared-in>
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288
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289 <para>
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290 Задаёт функцию njs в качестве фильтра заголовка ответа.
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291 Директива позволяет менять произвольные поля заголовка ответа.
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292 </para>
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293
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294 </directive>
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295
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296
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297 <directive name="js_import">
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298 <syntax><value>модуль.js</value> |
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299 <value>имя_экспорта из модуль.js</value></syntax>
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300 <default/>
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301 <context>http</context>
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302 <appeared-in>0.4.0</appeared-in>
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303
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304 <para>
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305 Импортирует модуль, позволяющий задавать обработчики location и переменных
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306 на njs.
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307 <literal>Имя_экспорта</literal> является пространством имён
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308 при доступе к функциям модуля.
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309 Если <literal>имя_экспорта</literal> не задано,
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310 то пространством имён будет являться имя модуля.
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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 В примере при доступе к экспорту в качестве
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315 пространства имён используется имя модуля <literal>http</literal>.
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316 Если импортируемый модуль экспортирует <literal>foo()</literal>,
2530
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317 то для доступа используется <literal>http.foo</literal>.
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318 </para>
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319
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320 <para>
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321 Директив <literal>js_import</literal> может быть несколько.
2142
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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>файл</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 Задаёт файл, позволяющий задавать обработчики location и переменных на 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 Директива устарела начиная с
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350 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>,
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351 вместо неё следует использовать директиву <link id="js_import"/>.
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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
2352
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357 <directive name="js_path">
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358 <syntax>
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diff changeset
359 <value>путь</value></syntax>
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360 <default/>
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361 <context>http</context>
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diff changeset
362 <appeared-in>0.3.0</appeared-in>
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diff changeset
363
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diff changeset
364 <para>
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diff changeset
365 Задаёт дополнительный путь для модулей njs.
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366 </para>
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367
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diff changeset
368 </directive>
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diff changeset
369
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diff changeset
370
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diff changeset
371 <directive name="js_set">
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diff changeset
372 <syntax>
2530
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diff changeset
373 <value>$переменная</value> <value>функция</value> |
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374 <value>модуль.функция</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>
2686
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379 Задаёт <literal>функцию</literal> njs
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diff changeset
380 для указанной <literal>переменной</literal>.
2530
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diff changeset
381 Начиная с <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>
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diff changeset
382 можно ссылаться на функцию модуля.
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383 </para>
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diff changeset
384
2686
45214e5316cd Improved description of js_set.
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diff changeset
385 <para>
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diff changeset
386 Функция вызывается в момент
45214e5316cd Improved description of js_set.
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diff changeset
387 первого обращения к переменной для данного запроса.
45214e5316cd Improved description of js_set.
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diff changeset
388 Точный момент вызова функции зависит от
45214e5316cd Improved description of js_set.
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diff changeset
389 <link doc="../dev/development_guide.xml" id="http_phases">фазы</link>,
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diff changeset
390 в которой происходит обращение к переменной.
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diff changeset
391 Это можно использовать для реализации дополнительной логики,
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diff changeset
392 не относящейся к вычислению переменной.
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diff changeset
393 Например, если переменная указана
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diff changeset
394 в директиве <link doc="ngx_http_log_module.xml" id="log_format"/>,
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diff changeset
395 то её обработчик не будет выполняться до фазы записи в лог.
45214e5316cd Improved description of js_set.
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diff changeset
396 Этот обработчик также может использоваться для выполнения процедур
45214e5316cd Improved description of js_set.
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diff changeset
397 непосредственно перед освобождением запроса.
45214e5316cd Improved description of js_set.
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diff changeset
398 </para>
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diff changeset
399
2747
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diff changeset
400 <para>
42fb92e582db Added note to js_set about asyncronous calls.
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diff changeset
401 <note>
42fb92e582db Added note to js_set about asyncronous calls.
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402 Так как обработчик <literal>js_set</literal>
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403 должен сразу возвращать результат,
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404 то поддерживаются только синхронные вызовы,
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405 Таким образом, асинхронные вызовы, например
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406 <link doc="../njs/reference.xml" id="r_subrequest">r.subrequest()</link>
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407 или
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408 <link doc="../njs/reference.xml" id="settimeout">setTimeout()</link>,
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409 не поддерживаются.
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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
2693
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415
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416 <directive name="js_var">
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417 <syntax><value>$переменная</value> [<value>значение</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 Объявляет
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424 <link doc="../njs/reference.xml" id="r_variables">перезаписываемую</link>
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425 переменную.
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426 В качестве значения можно использовать текст, переменные и их комбинации.
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427 Переменная не перезаписывается после перенаправления,
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428 в отличие от переменных, созданных при помощи
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429 директивы <link doc="ngx_http_rewrite_module.xml" id="set"/>.
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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
2187
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437 <section id="arguments" name="Аргумент запроса">
2149
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438
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439 <para>
2187
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440 Каждый HTTP-обработчик njs получает один аргумент,
2288
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441 <link doc="../njs/reference.xml" id="http">объект</link> запроса.
1843
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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>