Mercurial > hg > nginx-site
annotate xml/ru/docs/njs/njs_api.xml @ 2183:97526b8346f4
Added r.internalRedirect and its example in njs.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 19 Jun 2018 15:43:45 +0300 |
parents | 7865ca0da0ab |
children | 23cfb62121d1 |
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 article SYSTEM "../../../../dtd/article.dtd"> |
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8 |
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9 <article name="njs API" |
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10 link="/ru/docs/njs/njs_api.html" |
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11 lang="ru" |
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12 rev="1"> |
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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 <link doc="../njs_about.xml">njs</link> предоставляет объекты, методы и свойства |
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18 для расширения функциональности nginx. |
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19 </para> |
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20 |
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21 </section> |
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22 |
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23 |
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24 <section id="http" name="HTTP"> |
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25 |
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26 |
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27 <section id="http_request" name="Запрос"> |
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28 |
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29 <para> |
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30 Объекты <literal>HTTP</literal> доступны только в |
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31 модуле <link doc="../http/ngx_http_js_module.xml">ngx_http_js_module</link>. |
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32 </para> |
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33 |
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34 <para> |
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35 <list type="tag"> |
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36 |
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37 <tag-name><literal>r.args{}</literal></tag-name> |
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38 <tag-desc> |
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39 объект аргументов запроса, только чтение |
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40 </tag-desc> |
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41 |
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42 <tag-name><literal>r.error(<value>строка</value>)</literal></tag-name> |
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43 <tag-desc> |
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44 записывает <literal>строку</literal> в лог-файл ошибок |
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45 на уровне лога <literal>error</literal> |
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46 </tag-desc> |
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47 |
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48 <tag-name><literal>r.finish()</literal></tag-name> |
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49 <tag-desc> |
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50 завершает отправку ответа клиенту |
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51 </tag-desc> |
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52 |
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53 <tag-name><literal>r.headersIn{}</literal></tag-name> |
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54 <tag-desc> |
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55 объект исходящих заголовков, только чтение. |
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56 <para> |
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57 Например, доступ к заголовку <literal>Header-Name</literal> |
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58 можно получить при помощи синтаксиса <literal>headers['Header-Name']</literal> |
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59 или <literal>headers.Header_name</literal> |
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60 </para> |
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61 </tag-desc> |
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62 |
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63 <tag-name><literal>r.headersOut{}</literal></tag-name> |
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64 <tag-desc> |
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65 объект исходящих заголовков, доступно для записи. |
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66 <para> |
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67 Например, доступ к заголовку <literal>Header-Name</literal> |
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68 можно получить при помощи синтаксиса <literal>headers['Header-Name']</literal> |
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69 или <literal>headers.Header_name</literal> |
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70 </para> |
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71 </tag-desc> |
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72 |
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73 <tag-name><literal>r.httpVersion</literal></tag-name> |
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74 <tag-desc> |
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75 версия HTTP, только чтение |
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76 </tag-desc> |
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77 |
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78 <tag-name><literal>r.log(<value>строка</value>)</literal></tag-name> |
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79 <tag-desc> |
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80 записывает <literal>строку</literal> в лог-файл ошибок |
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81 на уровне лога <literal>info</literal> |
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82 </tag-desc> |
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83 |
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84 <tag-name><literal>r.method</literal></tag-name> |
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85 <tag-desc> |
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86 HTTP метод, только чтение |
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87 </tag-desc> |
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88 |
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89 <tag-name><literal>r.parent</literal></tag-name> |
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90 <tag-desc> |
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91 ссылается на родительский объект запроса |
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92 </tag-desc> |
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93 |
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94 <tag-name><literal>r.remoteAddress</literal></tag-name> |
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95 <tag-desc> |
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96 адрес клиента, только чтение |
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97 </tag-desc> |
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98 |
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99 <tag-name><literal>r.requestBody</literal></tag-name> |
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100 <tag-desc> |
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101 хранит тело запроса, только чтение |
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102 </tag-desc> |
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103 |
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104 <tag-name><literal>r.responseBody</literal></tag-name> |
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105 <tag-desc> |
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106 хранит тело ответа <link id="subrequest">подзапроса</link>, только чтение |
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107 </tag-desc> |
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108 |
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109 <tag-name><literal>r.return(код[, строка])</literal></tag-name> |
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110 <tag-desc> |
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111 отправляет |
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112 клиенту полный ответ с указанным <literal>кодом</literal> |
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113 <para> |
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114 Можно задать или URL перенаправления |
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115 (для кодов 301, 302, 303, 307 и 308), |
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116 или текст тела ответа (для остальных кодов) в качестве второго аргумента |
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117 </para> |
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118 </tag-desc> |
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119 |
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120 <tag-name><literal>r.send(<value>строка</value>)</literal></tag-name> |
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121 <tag-desc> |
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122 отправляет часть тела ответа клиенту |
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123 </tag-desc> |
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124 |
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125 <tag-name><literal>r.sendHeader()</literal></tag-name> |
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126 <tag-desc> |
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127 отправляет заголовок HTTP клиенту |
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128 </tag-desc> |
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129 |
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130 <tag-name><literal>r.status</literal></tag-name> |
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131 <tag-desc> |
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132 статус, доступно для записи |
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133 </tag-desc> |
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134 |
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135 <tag-name><literal>req.variables{}</literal></tag-name> |
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136 <tag-desc> |
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137 объект переменных nginx, только чтение |
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138 </tag-desc> |
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139 |
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140 <tag-name><literal>r.warn(<value>строка</value>)</literal></tag-name> |
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141 <tag-desc> |
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142 записывает <literal>строку</literal> в лог-файл ошибок |
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143 на уровне лога <literal>warning</literal> |
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144 </tag-desc> |
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145 |
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146 <tag-name><literal>r.uri</literal></tag-name> |
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147 <tag-desc> |
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148 текущий URI, только чтение |
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149 </tag-desc> |
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150 |
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151 <tag-name id="subrequest"><literal>r.subrequest(<value>uri</value>[, |
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152 <value>options</value>[, <value>callback</value>]])</literal></tag-name> |
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153 <tag-desc> |
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154 создаёт подзапрос с заданными <literal>uri</literal> и |
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155 <literal>options</literal> и |
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156 устанавливает необязательный <literal>callback</literal> завершения. |
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157 |
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158 <para> |
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159 Если <literal>options</literal> является строкой, то в ней |
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160 содержится срока аргументов подзапроса. |
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161 В противном случае ожидается, что <literal>options</literal> является объектом |
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162 со следующими ключами: |
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163 |
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164 <list type="tag"> |
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165 <tag-name><literal>args</literal></tag-name> |
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166 <tag-desc> |
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167 строка с аргументами |
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168 </tag-desc> |
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169 |
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170 <tag-name><literal>body</literal></tag-name> |
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171 <tag-desc> |
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172 тело запроса |
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173 </tag-desc> |
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174 |
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175 <tag-name><literal>method</literal></tag-name> |
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176 <tag-desc |
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177 >метод HTTP |
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178 </tag-desc> |
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179 |
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180 </list> |
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181 </para> |
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182 |
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183 <para> |
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184 <literal>callback</literal> получает |
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185 объект ответа подзапроса с методами и свойствами, |
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186 идентичными родительскому объекту запроса. |
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187 </para> |
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188 </tag-desc> |
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189 |
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190 </list> |
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191 </para> |
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192 |
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193 </section> |
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194 |
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195 </section> |
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196 |
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197 |
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198 <section id="stream" name="Stream"> |
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199 |
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200 <para> |
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201 Объекты <literal>stream</literal> доступны только в |
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202 модуле |
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203 <link doc="../stream/ngx_stream_js_module.xml">ngx_stream_js_module</link>. |
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204 </para> |
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205 |
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206 |
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207 <section id="stream_session" name="Сессия"> |
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208 |
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209 <para> |
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210 <list type="tag"> |
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211 |
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212 <tag-name><literal>s.remoteAddress</literal></tag-name> |
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213 <tag-desc> |
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214 адрес клиента, только чтение |
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215 </tag-desc> |
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216 |
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217 <tag-name><literal>s.eof</literal></tag-name> |
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218 <tag-desc> |
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219 логическое свойство, |
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220 true, если текущий буфер является последним буфером, |
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221 только чтение |
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222 </tag-desc> |
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223 |
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224 <tag-name><literal>s.fromUpstream</literal></tag-name> |
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225 <tag-desc> |
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226 логическое свойство, |
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227 true, если текущий буфер является буфером от проксируемого сервера к клиенту, |
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228 только чтение |
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229 </tag-desc> |
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230 |
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231 <tag-name><literal>s.buffer</literal></tag-name> |
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232 <tag-desc> |
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233 текущий буфер, доступен для записи |
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234 </tag-desc> |
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235 |
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236 <tag-name><literal>s.variables{}</literal></tag-name> |
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237 <tag-desc> |
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238 объект переменных nginx, только чтение |
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239 </tag-desc> |
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240 |
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241 <tag-name><literal>s.OK</literal></tag-name> |
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242 <tag-desc> |
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243 код <literal>OK</literal> |
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244 </tag-desc> |
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245 |
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246 <tag-name><literal>s.DECLINED</literal></tag-name> |
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247 <tag-desc> |
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248 код <literal>DECLINED</literal> |
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249 </tag-desc> |
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250 |
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251 <tag-name><literal>s.AGAIN</literal></tag-name> |
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252 <tag-desc> |
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253 код <literal>AGAIN</literal> |
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254 </tag-desc> |
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255 |
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256 <tag-name><literal>s.ERROR</literal></tag-name> |
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257 <tag-desc> |
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258 код <literal>ERROR</literal> |
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259 </tag-desc> |
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260 |
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261 <tag-name><literal>s.ABORT</literal></tag-name> |
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262 <tag-desc> |
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263 код <literal>ABORT</literal> |
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264 </tag-desc> |
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265 |
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266 <tag-name><literal>s.log(<value>строка</value>)</literal></tag-name> |
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267 <tag-desc> |
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268 записывает отправленную <value>строку</value> в лог-файл ошибок |
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269 на уровне лога <literal>info</literal> |
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270 </tag-desc> |
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271 |
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272 <tag-name><literal>s.warn(<value>строка</value>)</literal></tag-name> |
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273 <tag-desc> |
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274 записывает отправленную <literal>строку</literal> в лог-файл ошибок |
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275 на уровне лога <literal>warning</literal> |
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276 </tag-desc> |
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277 |
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278 <tag-name><literal>s.error(<value>строка</value>)</literal></tag-name> |
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279 <tag-desc> |
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280 записывает отправленную <literal>строку</literal> в лог-файл ошибок |
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281 на уровне лога <literal>error</literal> |
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282 </tag-desc> |
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283 |
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284 </list> |
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285 </para> |
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286 |
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287 </section> |
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288 |
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289 </section> |
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290 |
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291 |
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292 <section id="example" name="Примеры"> |
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293 |
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294 |
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295 <section id="example_urldecode" name="Декодирование URL"> |
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296 |
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297 <para> |
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298 <example> |
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299 js_include urldecode.js; |
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300 |
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301 js_set $decoded_foo decoded_foo; |
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302 </example> |
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303 </para> |
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304 |
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305 <para> |
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306 Файл <path>urldecode.js</path>: |
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307 <example> |
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308 function decoded_foo(r) { |
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309 return decodeURIComponent(r.args.foo); |
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310 } |
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311 </example> |
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312 </para> |
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313 |
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314 </section> |
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315 |
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316 |
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317 <section id="example_urlencode" name="Кодирование URL"> |
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318 |
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319 <para> |
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320 <example> |
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321 js_include urlencode.js; |
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322 |
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323 js_set $encoded_foo encoded_foo; |
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324 ... |
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325 |
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326 location / { |
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327 proxy_pass http://example.com?foo=$encoded_foo; |
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328 } |
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329 </example> |
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330 </para> |
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331 |
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332 <para> |
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333 Файл <path>urlencode.js</path>: |
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334 <example> |
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335 function encoded_foo(r) { |
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336 return encodeURIComponent('foo & bar?'); |
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337 } |
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338 </example> |
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339 </para> |
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340 |
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341 </section> |
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342 |
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343 |
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344 <section id="example_fast_response" name="Возврат самого быстрого ответа от прокси"> |
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345 |
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346 <para> |
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347 <example> |
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348 js_include fastresponse.js; |
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349 |
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350 location /start { |
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351 js_content content; |
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352 } |
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353 |
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354 location /foo { |
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355 proxy_pass http://backend1; |
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356 } |
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357 |
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358 location /bar { |
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359 proxy_pass http://backend2; |
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360 } |
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361 </example> |
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362 </para> |
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363 |
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364 <para> |
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365 Файл <path>fastresponse.js</path>: |
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366 <example> |
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367 function content(r) { |
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368 var n = 0; |
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369 |
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370 function done(res) { |
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371 if (n++ == 0) { |
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372 r.return(res.status, res.responseBody); |
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373 } |
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374 } |
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375 |
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376 r.subrequest('/foo', r.variables.args, done); |
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377 r.subrequest('/bar', r.variables.args, done);TBD |
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378 } |
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379 </example> |
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380 </para> |
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381 |
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382 </section> |
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383 |
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384 |
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385 <section id="example_jwt" name="Создание HS JWT"> |
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386 |
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387 <para> |
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388 <example> |
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389 js_include hs_jwt.js; |
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390 |
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391 js_set $jwt jwt; |
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392 </example> |
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393 </para> |
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394 |
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395 <para> |
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396 Файл <path>hs_jwt.js</path>: |
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397 <example> |
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398 function create_hs256_jwt(claims, key, valid) { |
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399 var header = { "typ" : "JWT", "alg" : "HS256", "exp" : Date.now() + valid }; |
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400 |
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401 var s = JSON.stringify(header).toBytes().toString('base64url') + '.' |
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402 + JSON.stringify(claims).toBytes().toString('base64url'); |
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403 |
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404 var h = require('crypto').createHmac('sha256', key); |
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405 |
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406 return s + '.' + h.update(s).digest().toString('base64url'); |
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407 } |
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408 |
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409 function jwt(r) { |
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410 var claims = { |
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411 "iss" : "nginx", |
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412 "sub" : "alice", |
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413 "foo" : 123, |
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414 "bar" : "qq", |
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415 "zyx" : false |
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416 }; |
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417 |
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418 return create_hs256_jwt(claims, 'foo', 600); |
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419 } |
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420 </example> |
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421 </para> |
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422 |
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423 </section> |
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424 |
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425 |
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426 <section id="example_subrequest" name="Доступ к API при помощи подзапроса"> |
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427 |
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428 <para> |
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429 <example> |
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430 js_include subrequest.js; |
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431 |
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432 keyval_zone zone=foo:10m; |
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433 ... |
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434 |
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435 location /keyval { |
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436 js_content set_keyval; |
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437 } |
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438 |
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439 location /version { |
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440 js_content version; |
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441 } |
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442 |
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443 location /api { |
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444 api write=on; |
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445 } |
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446 </example> |
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447 </para> |
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448 |
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449 <para> |
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450 Файл <path>subrequest.js</path>: |
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451 <example> |
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452 function set_keyval(r) { |
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453 r.subrequest('/api/3/http/keyvals/foo', |
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454 { method: 'POST', |
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455 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })}, |
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456 |
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457 function(res) { |
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458 if (res.status >= 300) { |
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459 r.return(res.status, res.responseBody); |
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460 return; |
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461 } |
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462 r.return(500); |
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463 }); |
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464 } |
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465 function version(r) { |
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466 r.subrequest('/api/3/nginx', { method: 'GET' }, function(res) { |
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467 if (res.status != 200) { |
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468 r.return(res.status); |
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469 return; |
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470 } |
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471 |
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472 var json = JSON.parse(res.responseBody); |
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473 r.return(200, json.version); |
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474 }); |
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475 } |
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476 </example> |
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477 </para> |
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478 |
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479 </section> |
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480 |
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481 |
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482 <section id="example_secure_link" name="Создание хэша secure_link"> |
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483 |
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484 <para> |
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485 <example> |
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486 js_include hash.js; |
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487 |
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488 js_set $new_foo create_secure_link; |
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489 ... |
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490 |
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491 location / { |
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492 secure_link $cookie_foo; |
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493 secure_link_md5 "$uri mykey"; |
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494 ... |
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495 } |
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496 |
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497 location @login { |
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498 add_header Set-Cookie "foo=$new_foo; Max-Age=60"; |
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499 return 302 /; |
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500 } |
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501 </example> |
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502 </para> |
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503 |
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504 <para> |
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505 Файл <path>hash.js</path>: |
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506 <example> |
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507 function create_secure_link(r) { |
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508 return require('crypto').createHash('md5') |
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509 .update(r.uri).update(" mykey") |
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510 .digest('base64url'); |
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511 } |
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512 </example> |
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513 </para> |
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514 |
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515 </section> |
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516 |
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517 </section> |
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518 |
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519 </article> |
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520 |