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annotate xml/ru/docs/stream/ngx_stream_js_module.xml @ 2845:a3aee2697d4e

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Documented directives for Fetch API in njs.
author Yaroslav Zhuravlev <yar@nginx.com>
date Thu, 05 May 2022 18:31:47 +0100
parents eb11724745e3
children fd8ec06ceafa
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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_stream_js_module"
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10 link="/ru/docs/stream/ngx_stream_js_module.html"
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11 lang="ru"
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12 rev="31">
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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_stream_js_module</literal> позволяет задавать
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18 обработчики на <link doc="../njs/index.xml">njs</link> —
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19 подмножестве языка JavaScript.
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20 </para>
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21
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22 <para>
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23 Инструкция по сборке и установке доступны
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24 <link doc="../njs/install.xml">здесь</link>.
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25 </para>
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26
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27 </section>
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29
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30 <section id="example" name="Пример конфигурации">
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31
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32 <para>
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33 Пример работает начиная с версии
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34 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>.
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35 <example>
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36 stream {
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37 js_import stream.js;
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38
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39 js_set $bar stream.bar;
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40 js_set $req_line stream.req_line;
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41
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42 server {
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43 listen 12345;
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44
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45 js_preread stream.preread;
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46 return $req_line;
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47 }
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48
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49 server {
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50 listen 12346;
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51
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52 js_access stream.access;
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53 proxy_pass 127.0.0.1:8000;
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54 js_filter stream.header_inject;
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55 }
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56 }
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57
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58 http {
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59 server {
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60 listen 8000;
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61 location / {
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62 return 200 $http_foo\n;
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63 }
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64 }
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65 }
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66 </example>
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67 </para>
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68
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69 <para>
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70 Файл <path>stream.js</path>:
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71 <example>
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72 var line = '';
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73
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74 function bar(s) {
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75 var v = s.variables;
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76 s.log("hello from bar() handler!");
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77 return "bar-var" + v.remote_port + "; pid=" + v.pid;
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78 }
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79
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80 function preread(s) {
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81 s.on('upload', function (data, flags) {
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82 var n = data.indexOf('\n');
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83 if (n != -1) {
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84 line = data.substr(0, n);
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85 s.done();
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86 }
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87 });
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88 }
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89
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90 function req_line(s) {
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91 return line;
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92 }
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93
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94 // Чтение строки HTTP-запроса.
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95 // Получение байт в 'req' до того как
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96 // будет прочитана строка запроса.
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97 // Добавление HTTP-заголовка в запрос клиента
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98
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99 var my_header = 'Foo: foo';
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100 function header_inject(s) {
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101 var req = '';
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102 s.on('upload', function(data, flags) {
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103 req += data;
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104 var n = req.search('\n');
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105 if (n != -1) {
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106 var rest = req.substr(n + 1);
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107 req = req.substr(0, n + 1);
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108 s.send(req + my_header + '\r\n' + rest, flags);
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109 s.off('upload');
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110 }
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111 });
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112 }
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113
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114 function access(s) {
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115 if (s.remoteAddress.match('^192.*')) {
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116 s.deny();
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117 return;
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118 }
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119
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120 s.allow();
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121 }
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122
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123 export default {bar, preread, req_line, header_inject, access};
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124 </example>
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125 </para>
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126
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127 </section>
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128
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129
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130 <section id="directives" name="Директивы">
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131
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132 <directive name="js_access">
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133 <syntax><value>функция</value> | <value>модуль.функция</value></syntax>
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134 <default/>
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135 <context>stream</context>
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136 <context>server</context>
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137
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138 <para>
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139 Задаёт функцию njs, которая будет вызываться в
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140 <link doc="stream_processing.xml" id="access_phase">access</link>-фазе.
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141 Начиная с <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>
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142 можно ссылаться на функцию модуля.
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143 </para>
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144
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145 </directive>
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146
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147
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148 <directive name="js_fetch_buffer_size">
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149 <syntax><value>размер</value></syntax>
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150 <default>16k</default>
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151 <context>stream</context>
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152 <context>server</context>
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153 <appeared-in>0.7.4</appeared-in>
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154
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155 <para>
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156 Задаёт <value>размер</value> буфера, который будет использоваться
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157 для чтения и записи для
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158 <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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159 </para>
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160
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161 </directive>
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162
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163
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164 <directive name="js_fetch_ciphers">
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165 <syntax><value>шифры</value></syntax>
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166 <default>HIGH:!aNULL:!MD5</default>
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167 <context>stream</context>
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168 <context>server</context>
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169 <appeared-in>0.7.0</appeared-in>
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170
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171 <para>
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172 Описывает разрешённые шифры для HTTPS-соединений
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173 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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174 Шифры задаются в формате, поддерживаемом библиотекой OpenSSL.
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175 </para>
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176
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177 <para>
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178 Полный список можно посмотреть с помощью команды
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179 “<command>openssl ciphers</command>”.
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180 </para>
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181
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182 </directive>
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183
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184
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185 <directive name="js_fetch_max_response_buffer_size">
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186 <syntax><value>размер</value></syntax>
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187 <default>1m</default>
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188 <context>stream</context>
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189 <context>server</context>
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190 <appeared-in>0.7.4</appeared-in>
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191
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192 <para>
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193 Задаёт максимальный <value>размер</value> ответа, полученного
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194 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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195 </para>
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196
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197 </directive>
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198
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199
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200 <directive name="js_fetch_protocols">
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201 <syntax>
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202 [<literal>TLSv1</literal>]
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203 [<literal>TLSv1.1</literal>]
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204 [<literal>TLSv1.2</literal>]
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205 [<literal>TLSv1.3</literal>]</syntax>
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206 <default>TLSv1 TLSv1.1 TLSv1.2</default>
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207 <context>stream</context>
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208 <context>server</context>
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209 <appeared-in>0.7.0</appeared-in>
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210
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211 <para>
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212 Разрешает указанные протоколы для HTTPS-соединений
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213 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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214 </para>
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215
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216 </directive>
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217
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218
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219 <directive name="js_fetch_timeout">
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220 <syntax><value>время</value></syntax>
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221 <default>60s</default>
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222 <context>stream</context>
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223 <context>server</context>
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224 <appeared-in>0.7.4</appeared-in>
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225
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226 <para>
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227 Задаёт таймаут при чтении и записи
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228 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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229 Таймаут устанавливается не на всю передачу ответа,
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230 а только между двумя операциями чтения.
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231 Если по истечении этого времени данные не передавались, соединение закрывается.
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232 </para>
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233
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234 </directive>
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235
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236
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237 <directive name="js_fetch_trusted_certificate">
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238 <syntax><value>файл</value></syntax>
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239 <default/>
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240 <context>stream</context>
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241 <context>server</context>
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242 <appeared-in>0.7.0</appeared-in>
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243
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244 <para>
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245 Задаёт <value>файл</value> с доверенными сертификатами CA в формате PEM,
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246 используемыми при
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247 <link doc="../njs/reference.xml" id="fetch_verify">проверке</link>
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248 HTTPS-сертификата
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249 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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250 </para>
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251
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252 </directive>
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253
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254
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255 <directive name="js_fetch_verify">
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256 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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257 <default>on</default>
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258 <context>stream</context>
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259 <context>server</context>
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260 <appeared-in>0.7.4</appeared-in>
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261
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262 <para>
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263 Разрешает или запрещает проверку сертификата HTTPS-сервера
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264 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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265 </para>
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266
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267 </directive>
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268
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269
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270 <directive name="js_fetch_verify_depth">
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271 <syntax><value>число</value></syntax>
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272 <default>100</default>
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273 <context>stream</context>
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274 <context>server</context>
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275 <appeared-in>0.7.0</appeared-in>
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276
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277 <para>
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278 Устанавливает глубину проверки в цепочке HTTPS-сертификатов
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279 при помощи <link doc="../njs/reference.xml" id="ngx_fetch">Fetch API</link>.
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280 </para>
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281
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282 </directive>
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283
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284
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285 <directive name="js_filter">
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286 <syntax><value>функция</value> | <value>модуль.функция</value></syntax>
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287 <default/>
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288 <context>stream</context>
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289 <context>server</context>
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290
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291 <para>
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292 Задаёт фильтр данных.
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293 Начиная с <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>
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294 можно ссылаться на функцию модуля.
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295 </para>
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296
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297 </directive>
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298
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299
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300 <directive name="js_import">
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301 <syntax><value>модуль.js</value> |
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302 <value>имя_экспорта from модуль.js</value></syntax>
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303 <default/>
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304 <context>stream</context>
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305 <appeared-in>0.4.0</appeared-in>
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306
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307 <para>
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308 Импортирует модуль, позволяющий задавать обработчики location и переменных
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309 на njs.
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310 <literal>Имя_экспорта</literal> является пространством имён
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311 при доступе к функциям модуля.
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312 Если <literal>имя_экспорта</literal> не задано,
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313 то пространством имён будет являться имя модуля.
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314 <example>
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315 js_import stream.js;
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316 </example>
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317 В примере при доступе к экспорту в качестве
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318 пространства имён используется имя модуля <literal>stream</literal>.
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319 Если импортируемый модуль экспортирует <literal>foo()</literal>,
2530
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320 то для доступа используется <literal>stream.foo</literal>.
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321 </para>
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322
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323 <para>
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324 Директив <literal>js_import</literal> может быть несколько.
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325 </para>
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326
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327 </directive>
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328
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329
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330 <directive name="js_include">
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331 <syntax><value>файл</value></syntax>
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332 <default/>
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333 <context>stream</context>
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334
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335 <para>
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336 Задаёт файл, который позволяет задавать обработчики server и переменных на njs:
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337 <example>
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338 nginx.conf:
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339 js_include stream.js;
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340 js_set $js_addr address;
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341 server {
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342 listen 127.0.0.1:12345;
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343 return $js_addr;
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344 }
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345
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346 stream.js:
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347 function address(s) {
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348 return s.remoteAddress;
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349 }
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350 </example>
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351 </para>
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352
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353 <para>
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diff changeset
354 Директива устарела в версии
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diff changeset
355 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>
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diff changeset
356 и была удалена в версии
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357 <link doc="../njs/changes.xml" id="njs0.7.1">0.7.1</link>.
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358 Вместо неё следует использовать директиву <link id="js_import"/>.
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359 </para>
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360
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361 </directive>
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362
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363
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364 <directive name="js_preread">
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diff changeset
365 <syntax><value>функция</value> | <value>модуль.функция</value></syntax>
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366 <default/>
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367 <context>stream</context>
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368 <context>server</context>
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369
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370 <para>
2128
59a3cc84f507 Renamed nginScript to njs
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diff changeset
371 Задаёт функцию njs, которая будет вызываться в
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diff changeset
372 <link doc="stream_processing.xml" id="preread_phase">preread</link>-фазе.
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373 Начиная с <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>
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374 можно ссылаться на функцию модуля.
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375 </para>
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376
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377 </directive>
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378
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379
2352
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diff changeset
380 <directive name="js_path">
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diff changeset
381 <syntax>
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diff changeset
382 <value>путь</value></syntax>
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383 <default/>
2591
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parents: 2534
diff changeset
384 <context>stream</context>
2352
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diff changeset
385 <appeared-in>0.3.0</appeared-in>
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diff changeset
386
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diff changeset
387 <para>
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388 Задаёт дополнительный путь для модулей njs.
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389 </para>
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390
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diff changeset
391 </directive>
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392
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diff changeset
393
1840
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394 <directive name="js_set">
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395 <syntax>
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diff changeset
396 <value>$переменная</value> <value>функция</value> |
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diff changeset
397 <value>модуль.функция</value></syntax>
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398 <default/>
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diff changeset
399 <context>stream</context>
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parents:
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400
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diff changeset
401 <para>
2686
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parents: 2680
diff changeset
402 Задаёт <literal>функцию</literal> njs
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403 для указанной <literal>переменной</literal>.
2530
407c5bd5bffc Documented the js_import directive and corresponding changes.
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404 Начиная с <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>
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405 можно ссылаться на функцию модуля.
1840
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406 </para>
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407
2686
45214e5316cd Improved description of js_set.
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408 <para>
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parents: 2680
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409 Функция вызывается в момент
45214e5316cd Improved description of js_set.
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parents: 2680
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410 первого обращения к переменной для данного запроса.
45214e5316cd Improved description of js_set.
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411 Точный момент вызова функции зависит от
45214e5316cd Improved description of js_set.
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parents: 2680
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412 <link doc="stream_processing.xml">фазы</link>,
45214e5316cd Improved description of js_set.
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parents: 2680
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413 в которой происходит обращение к переменной.
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parents: 2680
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414 Это можно использовать для реализации дополнительной логики,
45214e5316cd Improved description of js_set.
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parents: 2680
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415 не относящейся к вычислению переменной.
45214e5316cd Improved description of js_set.
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416 Например, если переменная указана
45214e5316cd Improved description of js_set.
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parents: 2680
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417 в директиве <link doc="ngx_stream_log_module.xml" id="log_format"/>,
45214e5316cd Improved description of js_set.
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parents: 2680
diff changeset
418 то её обработчик не будет выполняться до фазы записи в лог.
45214e5316cd Improved description of js_set.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2680
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419 Этот обработчик также может использоваться для выполнения процедур
45214e5316cd Improved description of js_set.
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parents: 2680
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420 непосредственно перед освобождением запроса.
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parents: 2680
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421 </para>
45214e5316cd Improved description of js_set.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2680
diff changeset
422
2747
42fb92e582db Added note to js_set about asyncronous calls.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2697
diff changeset
423 <para>
42fb92e582db Added note to js_set about asyncronous calls.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2697
diff changeset
424 <note>
42fb92e582db Added note to js_set about asyncronous calls.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2697
diff changeset
425 Так как обработчик <literal>js_set</literal>
42fb92e582db Added note to js_set about asyncronous calls.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2697
diff changeset
426 должен сразу возвращать результат,
42fb92e582db Added note to js_set about asyncronous calls.
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parents: 2697
diff changeset
427 то поддерживаются только синхронные вызовы.
42fb92e582db Added note to js_set about asyncronous calls.
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parents: 2697
diff changeset
428 Таким образом, асинхронные вызовы, например
42fb92e582db Added note to js_set about asyncronous calls.
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parents: 2697
diff changeset
429 <link doc="../njs/reference.xml" id="ngx_fetch">ngx.fetch()</link>
42fb92e582db Added note to js_set about asyncronous calls.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2697
diff changeset
430 или
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parents: 2697
diff changeset
431 <link doc="../njs/reference.xml" id="settimeout">setTimeout()</link>,
42fb92e582db Added note to js_set about asyncronous calls.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2697
diff changeset
432 не поддерживаются.
42fb92e582db Added note to js_set about asyncronous calls.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2697
diff changeset
433 </note>
42fb92e582db Added note to js_set about asyncronous calls.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2697
diff changeset
434 </para>
42fb92e582db Added note to js_set about asyncronous calls.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2697
diff changeset
435
1840
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436 </directive>
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parents:
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437
2693
3cbd6e440581 Documented the js_var directive.
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parents: 2686
diff changeset
438
3cbd6e440581 Documented the js_var directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2686
diff changeset
439 <directive name="js_var">
3cbd6e440581 Documented the js_var directive.
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440 <syntax><value>$переменная</value> [<value>значение</value>]</syntax>
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diff changeset
441 <default/>
3cbd6e440581 Documented the js_var directive.
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parents: 2686
diff changeset
442 <context>stream</context>
3cbd6e440581 Documented the js_var directive.
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parents: 2686
diff changeset
443 <appeared-in>0.5.3</appeared-in>
3cbd6e440581 Documented the js_var directive.
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parents: 2686
diff changeset
444
3cbd6e440581 Documented the js_var directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2686
diff changeset
445 <para>
3cbd6e440581 Documented the js_var directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2686
diff changeset
446 Объявляет
3cbd6e440581 Documented the js_var directive.
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parents: 2686
diff changeset
447 <link doc="../njs/reference.xml" id="r_variables">перезаписываемую</link>
3cbd6e440581 Documented the js_var directive.
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parents: 2686
diff changeset
448 переменную.
3cbd6e440581 Documented the js_var directive.
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parents: 2686
diff changeset
449 В качестве значения можно использовать текст, переменные и их комбинации.
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diff changeset
450 </para>
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parents: 2686
diff changeset
451
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parents: 2686
diff changeset
452 </directive>
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parents: 2686
diff changeset
453
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454 </section>
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455
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parents:
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456
1843
3492eb9b8138 Translated http and stream js modules into Russian.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 1840
diff changeset
457 <section id="properties" name="Свойства объекта сессии">
1840
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diff changeset
458
15632fc2d548 Documented http and stream nginScript modules.
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parents:
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459 <para>
2175
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2135
diff changeset
460 Каждый stream-обработчик njs получает один аргумент,
2288
786e96c52c7a Corrected links and example in Russian http and stream js modules.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2246
diff changeset
461 <link doc="../njs/reference.xml" id="stream">объект</link> stream-сессии.
1840
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462 </para>
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463
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464 </section>
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parents:
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465
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466 </module>