Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_js_module.xml @ 2697:a45ba3a1d999
Corrected description of js_var for stream.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 30 Mar 2021 15:39:14 +0100 |
parents | 3cbd6e440581 |
children | 42fb92e582db |
rev | line source |
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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="28"> |
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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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29 |
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30 |
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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_header_filter"> |
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206 <syntax><value>функция</value> | <value>модуль.функция</value></syntax> |
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207 <default/> |
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208 <context>location</context> |
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209 <context>limit_except</context> |
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210 <appeared-in>0.5.1</appeared-in> |
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211 |
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212 <para> |
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213 Задаёт функцию njs в качестве фильтра заголовка ответа. |
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214 Директива позволяет менять произвольные поля заголовка ответа. |
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215 </para> |
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216 |
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217 </directive> |
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218 |
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219 |
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220 <directive name="js_import"> |
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221 <syntax><value>модуль.js</value> | |
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222 <value>имя_экспорта из модуль.js</value></syntax> |
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223 <default/> |
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224 <context>http</context> |
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225 <appeared-in>0.4.0</appeared-in> |
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226 |
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227 <para> |
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228 Импортирует модуль, позволяющий задавать обработчики location и переменных |
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229 на njs. |
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230 <literal>Имя_экспорта</literal> является пространством имён |
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231 при доступе к функциям модуля. |
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232 Если <literal>имя_экспорта</literal> не задано, |
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233 то пространством имён будет являться имя модуля. |
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234 <example> |
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235 js_import http.js; |
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236 </example> |
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237 В примере при доступе к экспорту в качестве |
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238 пространства имён используется имя модуля <literal>http</literal>. |
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239 Если импортируемый модуль экспортирует <literal>foo()</literal>, |
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240 то для доступа используется <literal>http.foo</literal>. |
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241 </para> |
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242 |
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243 <para> |
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244 Директив <literal>js_import</literal> может быть несколько. |
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245 </para> |
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246 |
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247 </directive> |
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248 |
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249 |
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250 <directive name="js_include"> |
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251 <syntax><value>файл</value></syntax> |
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252 <default/> |
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253 <context>http</context> |
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254 |
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255 <para> |
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256 Задаёт файл, позволяющий задавать обработчики location и переменных на njs: |
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257 <example> |
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258 nginx.conf: |
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259 js_include http.js; |
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260 location /version { |
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261 js_content version; |
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262 } |
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263 |
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264 http.js: |
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265 function version(r) { |
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266 r.return(200, njs.version); |
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267 } |
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268 </example> |
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269 </para> |
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270 |
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271 <para> |
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272 Директива устарела начиная с |
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273 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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274 вместо неё следует использовать директиву <link id="js_import"/>. |
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275 </para> |
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276 |
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277 </directive> |
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278 |
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279 |
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280 <directive name="js_path"> |
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281 <syntax> |
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282 <value>путь</value></syntax> |
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283 <default/> |
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284 <context>http</context> |
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285 <appeared-in>0.3.0</appeared-in> |
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286 |
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287 <para> |
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288 Задаёт дополнительный путь для модулей njs. |
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289 </para> |
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290 |
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291 </directive> |
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292 |
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293 |
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294 <directive name="js_set"> |
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295 <syntax> |
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296 <value>$переменная</value> <value>функция</value> | |
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297 <value>модуль.функция</value></syntax> |
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298 <default/> |
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299 <context>http</context> |
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300 |
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301 <para> |
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302 Задаёт <literal>функцию</literal> njs |
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303 для указанной <literal>переменной</literal>. |
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304 Начиная с <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link> |
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305 можно ссылаться на функцию модуля. |
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306 </para> |
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307 |
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308 <para> |
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309 Функция вызывается в момент |
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310 первого обращения к переменной для данного запроса. |
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311 Точный момент вызова функции зависит от |
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312 <link doc="../dev/development_guide.xml" id="http_phases">фазы</link>, |
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313 в которой происходит обращение к переменной. |
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314 Это можно использовать для реализации дополнительной логики, |
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315 не относящейся к вычислению переменной. |
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316 Например, если переменная указана |
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317 в директиве <link doc="ngx_http_log_module.xml" id="log_format"/>, |
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318 то её обработчик не будет выполняться до фазы записи в лог. |
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319 Этот обработчик также может использоваться для выполнения процедур |
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320 непосредственно перед освобождением запроса. |
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321 </para> |
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322 |
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323 </directive> |
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324 |
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325 |
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326 <directive name="js_var"> |
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327 <syntax><value>$переменная</value> [<value>значение</value>]</syntax> |
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328 <default/> |
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329 <context>http</context> |
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330 <appeared-in>0.5.3</appeared-in> |
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331 |
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332 <para> |
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333 Объявляет |
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334 <link doc="../njs/reference.xml" id="r_variables">перезаписываемую</link> |
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335 переменную. |
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336 В качестве значения можно использовать текст, переменные и их комбинации. |
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337 Переменная не перезаписывается после перенаправления, |
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338 в отличие от переменных, созданных при помощи |
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339 директивы <link doc="ngx_http_rewrite_module.xml" id="set"/>. |
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340 </para> |
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341 |
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342 </directive> |
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343 |
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344 </section> |
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345 |
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346 |
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347 <section id="arguments" name="Аргумент запроса"> |
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348 |
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349 <para> |
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Updated HTTP njs module according to njs 0.2.2.
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350 Каждый HTTP-обработчик njs получает один аргумент, |
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351 <link doc="../njs/reference.xml" id="http">объект</link> запроса. |
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352 </para> |
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353 |
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Translated http and stream js modules into Russian.
Yaroslav Zhuravlev <yar@nginx.com>
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354 </section> |
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355 |
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356 </module> |