Mercurial > hg > nginx-site
annotate xml/ru/docs/njs/reference.xml @ 2257:8cef5ef98336
Changed quotes to ASCII in NJS example.
author | Nick Shadrin <nick@nginx.com> |
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date | Wed, 17 Oct 2018 15:42:16 -0700 |
parents | 32ba43abf9cd |
children | 65c6c1ee3c78 |
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="Справочник" |
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10 link="/ru/docs/njs/reference.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="index.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 <para> |
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27 Объект <literal>HTTP</literal> доступен только в |
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28 модуле <link doc="../http/ngx_http_js_module.xml">ngx_http_js_module</link>. |
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29 Все строки в объекте <literal>HTTP</literal> являются |
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30 <link id="strings">байтовыми строками</link>. |
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31 </para> |
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32 |
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33 |
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34 <section id="http_request" name="Запрос"> |
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35 |
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36 <para> |
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37 <list type="tag"> |
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38 |
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39 <tag-name><literal>r.args{}</literal></tag-name> |
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40 <tag-desc> |
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41 объект аргументов запроса, только чтение |
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42 </tag-desc> |
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43 |
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44 <tag-name><literal>r.error(<value>строка</value>)</literal></tag-name> |
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45 <tag-desc> |
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46 записывает <literal>строку</literal> в лог-файл ошибок |
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47 на уровне лога <literal>error</literal> |
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48 </tag-desc> |
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49 |
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50 <tag-name><literal>r.finish()</literal></tag-name> |
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51 <tag-desc> |
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52 завершает отправку ответа клиенту |
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53 </tag-desc> |
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54 |
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55 <tag-name><literal>r.headersIn{}</literal></tag-name> |
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56 <tag-desc> |
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57 объект исходящих заголовков, только чтение. |
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58 <para> |
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59 Например, доступ к заголовку <literal>Header-Name</literal> |
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60 можно получить при помощи синтаксиса <literal>headers['Header-Name']</literal> |
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61 или <literal>headers.Header_name</literal> |
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62 </para> |
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63 </tag-desc> |
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64 |
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65 <tag-name><literal>r.headersOut{}</literal></tag-name> |
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66 <tag-desc> |
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67 объект исходящих заголовков, доступно для записи. |
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68 <para> |
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69 Например, доступ к заголовку <literal>Header-Name</literal> |
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70 можно получить при помощи синтаксиса <literal>headers['Header-Name']</literal> |
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71 или <literal>headers.Header_name</literal> |
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72 </para> |
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73 </tag-desc> |
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74 |
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75 <tag-name><literal>r.httpVersion</literal></tag-name> |
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76 <tag-desc> |
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77 версия HTTP, только чтение |
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78 </tag-desc> |
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79 |
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80 <tag-name><literal>r.log(<value>строка</value>)</literal></tag-name> |
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81 <tag-desc> |
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82 записывает <literal>строку</literal> в лог-файл ошибок |
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83 на уровне лога <literal>info</literal> |
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84 </tag-desc> |
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85 |
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86 <tag-name><literal>r.method</literal></tag-name> |
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87 <tag-desc> |
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88 HTTP метод, только чтение |
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89 </tag-desc> |
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90 |
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91 <tag-name><literal>r.parent</literal></tag-name> |
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92 <tag-desc> |
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93 ссылается на родительский объект запроса |
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94 </tag-desc> |
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95 |
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96 <tag-name><literal>r.remoteAddress</literal></tag-name> |
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97 <tag-desc> |
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98 адрес клиента, только чтение |
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99 </tag-desc> |
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100 |
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101 <tag-name><literal>r.requestBody</literal></tag-name> |
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102 <tag-desc> |
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103 хранит тело запроса, только чтение |
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104 </tag-desc> |
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105 |
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106 <tag-name><literal>r.responseBody</literal></tag-name> |
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107 <tag-desc> |
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108 хранит тело ответа <link id="subrequest">подзапроса</link>, только чтение |
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109 </tag-desc> |
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110 |
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111 <tag-name><literal>r.return(код[, строка])</literal></tag-name> |
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112 <tag-desc> |
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113 отправляет |
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114 клиенту полный ответ с указанным <literal>кодом</literal> |
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115 <para> |
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116 Можно задать или URL перенаправления |
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117 (для кодов 301, 302, 303, 307 и 308), |
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118 или текст тела ответа (для остальных кодов) в качестве второго аргумента |
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119 </para> |
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120 </tag-desc> |
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121 |
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122 <tag-name><literal>r.send(<value>строка</value>)</literal></tag-name> |
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123 <tag-desc> |
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124 отправляет часть тела ответа клиенту |
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125 </tag-desc> |
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126 |
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127 <tag-name><literal>r.sendHeader()</literal></tag-name> |
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128 <tag-desc> |
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129 отправляет заголовок HTTP клиенту |
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130 </tag-desc> |
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131 |
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132 <tag-name><literal>r.status</literal></tag-name> |
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133 <tag-desc> |
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134 статус, доступно для записи |
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135 </tag-desc> |
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136 |
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137 <tag-name><literal>req.variables{}</literal></tag-name> |
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138 <tag-desc> |
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139 объект переменных nginx, только чтение |
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140 </tag-desc> |
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141 |
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142 <tag-name><literal>r.warn(<value>строка</value>)</literal></tag-name> |
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143 <tag-desc> |
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144 записывает <literal>строку</literal> в лог-файл ошибок |
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145 на уровне лога <literal>warning</literal> |
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146 </tag-desc> |
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147 |
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148 <tag-name><literal>r.uri</literal></tag-name> |
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149 <tag-desc> |
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150 текущий URI, только чтение |
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151 </tag-desc> |
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152 |
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153 <tag-name id="subrequest"><literal>r.subrequest(<value>uri</value>[, |
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154 <value>options</value>[, <value>callback</value>]])</literal></tag-name> |
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155 <tag-desc> |
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156 создаёт подзапрос с заданными <literal>uri</literal> и |
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157 <literal>options</literal> и |
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158 устанавливает необязательный <literal>callback</literal> завершения. |
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159 |
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160 <para> |
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161 Если <literal>options</literal> является строкой, то в ней |
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162 содержится срока аргументов подзапроса. |
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163 В противном случае ожидается, что <literal>options</literal> является объектом |
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164 со следующими ключами: |
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165 |
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166 <list type="tag"> |
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167 <tag-name><literal>args</literal></tag-name> |
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168 <tag-desc> |
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169 строка с аргументами |
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170 </tag-desc> |
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171 |
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172 <tag-name><literal>body</literal></tag-name> |
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173 <tag-desc> |
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174 тело запроса |
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175 </tag-desc> |
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176 |
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177 <tag-name><literal>method</literal></tag-name> |
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178 <tag-desc |
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179 >метод HTTP |
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180 </tag-desc> |
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181 |
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182 </list> |
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183 </para> |
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184 |
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185 <para> |
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186 <literal>callback</literal> получает |
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187 объект ответа подзапроса с методами и свойствами, |
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188 идентичными родительскому объекту запроса. |
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189 </para> |
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190 </tag-desc> |
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191 |
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192 </list> |
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193 </para> |
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194 |
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195 </section> |
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196 |
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197 </section> |
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198 |
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199 |
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200 <section id="stream" name="Stream"> |
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201 |
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202 <para> |
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203 Объект <literal>stream</literal> доступен только в |
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204 модуле |
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205 <link doc="../stream/ngx_stream_js_module.xml">ngx_stream_js_module</link>. |
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206 Все строки в объекте <literal>stream</literal> являются |
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207 <link id="strings">байтовыми строками</link>. |
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208 </para> |
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209 |
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210 |
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211 <section id="stream_session" name="Сессия"> |
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212 |
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213 <para> |
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214 <list type="tag"> |
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215 |
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216 <tag-name><literal>s.remoteAddress</literal></tag-name> |
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217 <tag-desc> |
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218 адрес клиента, только чтение |
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219 </tag-desc> |
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220 |
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221 <tag-name><literal>s.eof</literal></tag-name> |
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222 <tag-desc> |
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223 логическое свойство, |
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224 true, если текущий буфер является последним буфером, |
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225 только чтение |
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226 </tag-desc> |
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227 |
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228 <tag-name><literal>s.fromUpstream</literal></tag-name> |
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229 <tag-desc> |
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230 логическое свойство, |
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231 true, если текущий буфер является буфером от проксируемого сервера к клиенту, |
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232 только чтение |
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233 </tag-desc> |
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234 |
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235 <tag-name><literal>s.buffer</literal></tag-name> |
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236 <tag-desc> |
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237 текущий буфер, доступен для записи |
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238 </tag-desc> |
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239 |
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240 <tag-name><literal>s.variables{}</literal></tag-name> |
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241 <tag-desc> |
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242 объект переменных nginx, только чтение |
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243 </tag-desc> |
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244 |
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245 <tag-name><literal>s.OK</literal></tag-name> |
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246 <tag-desc> |
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247 код <literal>OK</literal> |
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248 </tag-desc> |
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249 |
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250 <tag-name><literal>s.DECLINED</literal></tag-name> |
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251 <tag-desc> |
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252 код <literal>DECLINED</literal> |
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253 </tag-desc> |
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254 |
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255 <tag-name><literal>s.AGAIN</literal></tag-name> |
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256 <tag-desc> |
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257 код <literal>AGAIN</literal> |
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258 </tag-desc> |
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259 |
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260 <tag-name><literal>s.ERROR</literal></tag-name> |
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261 <tag-desc> |
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262 код <literal>ERROR</literal> |
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263 </tag-desc> |
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264 |
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265 <tag-name><literal>s.ABORT</literal></tag-name> |
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266 <tag-desc> |
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267 код <literal>ABORT</literal> |
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268 </tag-desc> |
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269 |
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270 <tag-name><literal>s.log(<value>строка</value>)</literal></tag-name> |
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271 <tag-desc> |
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272 записывает отправленную <value>строку</value> в лог-файл ошибок |
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273 на уровне лога <literal>info</literal> |
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274 </tag-desc> |
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275 |
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276 <tag-name><literal>s.warn(<value>строка</value>)</literal></tag-name> |
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277 <tag-desc> |
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278 записывает отправленную <literal>строку</literal> в лог-файл ошибок |
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279 на уровне лога <literal>warning</literal> |
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280 </tag-desc> |
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281 |
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282 <tag-name><literal>s.error(<value>строка</value>)</literal></tag-name> |
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283 <tag-desc> |
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284 записывает отправленную <literal>строку</literal> в лог-файл ошибок |
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285 на уровне лога <literal>error</literal> |
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286 </tag-desc> |
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287 |
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288 </list> |
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289 </para> |
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290 |
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291 </section> |
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292 |
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293 </section> |
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294 |
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295 |
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296 <section id="example" name="Примеры"> |
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297 |
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298 |
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299 <section id="example_urldecode" name="Декодирование URL"> |
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300 |
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301 <para> |
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302 <example> |
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303 js_include urldecode.js; |
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304 |
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305 js_set $decoded_foo decoded_foo; |
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306 </example> |
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307 </para> |
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308 |
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309 <para> |
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310 Файл <path>urldecode.js</path>: |
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311 <example> |
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312 function decoded_foo(r) { |
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313 return decodeURIComponent(r.args.foo); |
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314 } |
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315 </example> |
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316 </para> |
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317 |
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318 </section> |
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319 |
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320 |
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321 <section id="example_urlencode" name="Кодирование URL"> |
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322 |
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323 <para> |
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324 <example> |
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325 js_include urlencode.js; |
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326 |
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327 js_set $encoded_foo encoded_foo; |
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328 ... |
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329 |
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330 location / { |
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331 proxy_pass http://example.com?foo=$encoded_foo; |
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332 } |
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333 </example> |
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334 </para> |
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335 |
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336 <para> |
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337 Файл <path>urlencode.js</path>: |
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338 <example> |
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339 function encoded_foo(r) { |
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340 return encodeURIComponent('foo & bar?'); |
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341 } |
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342 </example> |
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343 </para> |
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344 |
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345 </section> |
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346 |
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347 |
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348 <section id="example_fast_response" name="Возврат самого быстрого ответа от прокси"> |
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349 |
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350 <para> |
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351 <example> |
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352 js_include fastresponse.js; |
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353 |
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354 location /start { |
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355 js_content content; |
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356 } |
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357 |
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358 location /foo { |
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359 proxy_pass http://backend1; |
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360 } |
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361 |
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362 location /bar { |
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363 proxy_pass http://backend2; |
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364 } |
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365 </example> |
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366 </para> |
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367 |
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368 <para> |
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369 Файл <path>fastresponse.js</path>: |
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370 <example> |
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371 function content(r) { |
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372 var n = 0; |
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373 |
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374 function done(res) { |
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375 if (n++ == 0) { |
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376 r.return(res.status, res.responseBody); |
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377 } |
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378 } |
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379 |
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380 r.subrequest('/foo', r.variables.args, done); |
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381 r.subrequest('/bar', r.variables.args, done);TBD |
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382 } |
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383 </example> |
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384 </para> |
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385 |
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386 </section> |
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387 |
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388 |
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389 <section id="example_jwt" name="Создание HS JWT"> |
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390 |
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391 <para> |
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392 <example> |
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393 js_include hs_jwt.js; |
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394 |
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395 js_set $jwt jwt; |
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396 </example> |
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397 </para> |
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398 |
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399 <para> |
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400 Файл <path>hs_jwt.js</path>: |
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401 <example> |
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402 function create_hs256_jwt(claims, key, valid) { |
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403 var header = { "typ" : "JWT", "alg" : "HS256", "exp" : Date.now() + valid }; |
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404 |
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405 var s = JSON.stringify(header).toBytes().toString('base64url') + '.' |
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406 + JSON.stringify(claims).toBytes().toString('base64url'); |
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407 |
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408 var h = require('crypto').createHmac('sha256', key); |
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409 |
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410 return s + '.' + h.update(s).digest().toString('base64url'); |
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411 } |
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412 |
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413 function jwt(r) { |
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414 var claims = { |
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415 "iss" : "nginx", |
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416 "sub" : "alice", |
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417 "foo" : 123, |
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418 "bar" : "qq", |
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419 "zyx" : false |
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420 }; |
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421 |
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422 return create_hs256_jwt(claims, 'foo', 600); |
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423 } |
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424 </example> |
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425 </para> |
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426 |
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427 </section> |
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428 |
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429 |
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430 <section id="example_subrequest" name="Доступ к API при помощи подзапроса"> |
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431 |
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432 <para> |
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433 <example> |
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434 js_include subrequest.js; |
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435 |
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436 keyval_zone zone=foo:10m; |
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437 ... |
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438 |
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439 location /keyval { |
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440 js_content set_keyval; |
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441 } |
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442 |
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443 location /version { |
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444 js_content version; |
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445 } |
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446 |
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447 location /api { |
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448 api write=on; |
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449 } |
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450 </example> |
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451 </para> |
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452 |
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453 <para> |
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454 Файл <path>subrequest.js</path>: |
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455 <example> |
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456 function set_keyval(r) { |
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457 r.subrequest('/api/3/http/keyvals/foo', |
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458 { method: 'POST', |
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459 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })}, |
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460 |
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461 function(res) { |
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462 if (res.status >= 300) { |
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463 r.return(res.status, res.responseBody); |
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464 return; |
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465 } |
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466 r.return(500); |
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467 }); |
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468 } |
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469 |
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470 function version(r) { |
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471 r.subrequest('/api/3/nginx', { method: 'GET' }, function(res) { |
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472 if (res.status != 200) { |
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473 r.return(res.status); |
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474 return; |
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475 } |
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476 |
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477 var json = JSON.parse(res.responseBody); |
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478 r.return(200, json.version); |
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479 }); |
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480 } |
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481 </example> |
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482 </para> |
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483 |
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484 </section> |
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485 |
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486 |
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487 <section id="example_secure_link" name="Создание хэша secure_link"> |
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488 |
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489 <para> |
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490 <example> |
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491 js_include hash.js; |
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492 |
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493 js_set $new_foo create_secure_link; |
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494 ... |
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495 |
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496 location / { |
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497 secure_link $cookie_foo; |
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498 secure_link_md5 "$uri mykey"; |
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499 ... |
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500 } |
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501 |
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502 location @login { |
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503 add_header Set-Cookie "foo=$new_foo; Max-Age=60"; |
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504 return 302 /; |
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505 } |
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506 </example> |
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507 </para> |
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508 |
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509 <para> |
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510 Файл <path>hash.js</path>: |
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511 <example> |
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512 function create_secure_link(r) { |
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513 return require('crypto').createHash('md5') |
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514 .update(r.uri).update(" mykey") |
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515 .digest('base64url'); |
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516 } |
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517 </example> |
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518 </para> |
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519 |
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520 </section> |
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521 |
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522 </section> |
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523 |
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524 </article> |
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525 |