Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_rewrite_module.xml @ 589:764fbac1b8b4
Added document revision.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 17 Jul 2012 05:02:15 +0000 |
parents | be54c443235a |
children | f2d8603813b0 |
rev | line source |
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222
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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) Igor Sysoev |
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5 Copyright (C) Nginx, Inc. |
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6 --> |
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7 |
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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9 |
382 | 10 <module name="Модуль ngx_http_rewrite_module" |
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11 link="/ru/docs/http/ngx_http_rewrite_module.html" |
589 | 12 lang="ru" |
13 rev="1"> | |
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
382 | 18 Модуль <literal>ngx_http_rewrite_module</literal> позволяет |
19 изменять URI с помощью регулярных выражений, делать перенаправления | |
391
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20 и выбирать конфигурацию по условию. |
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21 </para> |
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22 |
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23 <para> |
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24 Директивы модуля <literal>ngx_http_rewrite_module</literal> |
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25 обрабатываются в следующем порядке: |
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26 <list type="bullet"> |
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27 |
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28 <listitem> |
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29 выполняются директивы этого модуля, описанные на уровне |
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30 <link doc="ngx_http_core_module.xml" id="server">сервера</link>; |
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31 </listitem> |
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32 |
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33 <listitem> |
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34 ищется location для запроса; |
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35 </listitem> |
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36 |
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37 <listitem> |
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38 выполняются директивы этого модуля, описанные в выбранном |
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39 <link doc="ngx_http_core_module.xml" id="location"/>, |
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40 и если они изменяли URI, то ищется новый location для уже нового URI. |
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41 Этот цикл может повторяться до 10 раз, после чего возвращается |
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42 ошибка <http-status code="500" text="Internal Server Error"/>. |
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43 </listitem> |
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44 |
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45 </list> |
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46 </para> |
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47 |
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48 </section> |
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49 |
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50 |
382 | 51 <section id="directives" name="Директивы"> |
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52 |
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53 <directive name="break"> |
102
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54 <syntax/> |
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55 <default/> |
382 | 56 <context>server</context> |
57 <context>location</context> | |
58 <context>if</context> | |
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59 |
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60 <para> |
382 | 61 Завершает обработку текущего набора директив модуля |
62 <literal>ngx_http_rewrite_module</literal>. | |
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63 </para> |
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64 |
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65 <para> |
382 | 66 Пример: |
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67 <example> |
382 | 68 if ($slow) { |
69 limit_rate 10k; | |
70 break; | |
71 } | |
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72 </example> |
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73 </para> |
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74 |
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75 </directive> |
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76 |
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77 |
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78 <directive name="if"> |
108
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79 <syntax block="yes">(<value>условие</value>)</syntax> |
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80 <default/> |
382 | 81 <context>server</context> |
82 <context>location</context> | |
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83 |
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84 <para> |
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85 Проверяется указанное <value>условие</value>. |
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86 Если оно истинно, то выполняются указанные в фигурных скобках директивы |
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87 этого модуля и запросу назначается конфигурация, указанная внутри |
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88 директивы <literal>if</literal>. |
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89 Конфигурации внутри директив <literal>if</literal> наследуются с |
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90 предыдущего уровня конфигурации. |
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91 </para> |
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92 |
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93 <para> |
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94 В качестве условия могут быть заданы: |
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95 <list type="bullet"> |
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96 |
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97 <listitem> |
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98 имя переменной; ложными значениями переменной являются пустая строка |
382 | 99 или любая строка, начинающаяся на “<literal>0</literal>”; |
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100 </listitem> |
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101 |
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102 <listitem> |
382 | 103 сравнение переменной со строкой с помощью операторов |
104 “<literal>=</literal>” и “<literal>!=</literal>”; | |
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105 </listitem> |
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106 |
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107 <listitem> |
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108 соответствие переменной регулярному выражению с учётом |
382 | 109 регистра символов — “<literal>~</literal>” и без него — “<literal>~*</literal>”. |
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110 В регулярных выражениях можно использовать выделения, которые затем |
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111 доступны в виде переменных <var>$1</var>..<var>$9</var>. |
382 | 112 Также можно использовать отрицательные операторы “<literal>!~</literal>” |
113 и “<literal>!~*</literal>”. | |
114 Если в регулярном выражении встречаются символы “<literal>}</literal>” | |
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115 или “<literal>;</literal>”, то всё выражение следует заключить в одинарные |
382 | 116 или двойные кавычки. |
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117 </listitem> |
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118 |
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119 <listitem> |
382 | 120 проверка существования файла с помощью операторов “<literal>-f</literal>” |
121 и “<literal>!-f</literal>”; | |
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122 </listitem> |
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123 |
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124 <listitem> |
382 | 125 проверка существования каталога с помощью операторов “<literal>-d</literal>” |
126 и “<literal>!-d</literal>”; | |
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127 </listitem> |
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128 |
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129 <listitem> |
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130 проверка существования файла, каталога или символической ссылки |
382 | 131 с помощью операторов “<literal>-e</literal>” и “<literal>!-e</literal>”; |
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132 </listitem> |
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133 |
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134 <listitem> |
382 | 135 проверка исполняемости файла с помощью операторов “<literal>-x</literal>” |
136 и “<literal>!-x</literal>”. | |
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137 </listitem> |
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138 |
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139 </list> |
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140 </para> |
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141 |
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142 <para> |
382 | 143 Примеры: |
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144 <example> |
382 | 145 if ($http_user_agent ~ MSIE) { |
146 rewrite ^(.*)$ /msie/$1 break; | |
147 } | |
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148 |
382 | 149 if ($http_cookie ~* "id=([^;]+)(?:;|$)") { |
150 set $id $1; | |
151 } | |
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152 |
382 | 153 if ($request_method = POST) { |
154 return 405; | |
155 } | |
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156 |
382 | 157 if ($slow) { |
158 limit_rate 10k; | |
159 } | |
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160 |
382 | 161 if ($invalid_referer) { |
162 return 403; | |
163 } | |
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164 </example> |
391
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165 <note> |
382 | 166 Значение встроенной переменной <var>$invalid_referer</var> задаётся директивой |
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167 <link doc="ngx_http_referer_module.xml" id="valid_referers"/>. |
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168 </note> |
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169 </para> |
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170 |
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171 </directive> |
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172 |
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173 |
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174 <directive name="return"> |
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175 <syntax><value>код</value> [<value>текст</value>]</syntax> |
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176 <syntax><value>код</value> <value>URL</value></syntax> |
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177 <syntax><value>URL</value></syntax> |
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178 <default/> |
382 | 179 <context>server</context> |
180 <context>location</context> | |
181 <context>if</context> | |
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182 |
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183 <para> |
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184 Завершает обработку и возвращает клиенту указанный <value>код</value>. |
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185 Нестандартный код 444 закрывает соединение без передачи |
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186 заголовка ответа. |
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187 </para> |
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188 |
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189 <para> |
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190 Начиная с версии 0.8.42 можно задать |
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191 либо URL перенаправления (для кодов 301, 302, 303 и 307), |
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192 либо <value>текст</value> тела ответа (для остальных кодов). |
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193 В тексте тела ответа и URL перенаправления можно использовать переменные. |
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194 Как частный случай, URL перенаправления может быть задан как URI, |
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195 локальный для данного сервера, при этом полный URL перенаправления |
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196 формируется согласно схеме запроса (<var>$scheme</var>) и директив |
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197 <link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/> и |
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198 <link doc="ngx_http_core_module.xml" id="port_in_redirect"/>. |
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199 </para> |
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200 |
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201 <para> |
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202 Кроме того, в качестве единственного параметра можно указать |
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203 <value>URL</value> для временного перенаправления с кодом 302. |
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204 Такой параметр должен начинаться со строк “<literal>http://</literal>”, |
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205 “<literal>https://</literal>” или “<literal>$scheme</literal>”. |
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206 В <value>URL</value> можно использовать переменные. |
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207 </para> |
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208 |
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209 <para> |
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210 <note> |
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211 До версии 0.7.51 можно было возвращать только следующие коды: |
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212 204, 400, 402 — 406, 408, 410, 411, 413, 416 и 500 — 504. |
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213 </note> |
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214 |
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215 <note> |
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216 До версий 1.1.16 и 1.0.13 код 307 не обрабатывался как перенаправление. |
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217 </note> |
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218 </para> |
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219 |
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220 </directive> |
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221 |
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222 |
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223 <directive name="rewrite"> |
382 | 224 <syntax> |
225 <value>regex</value> | |
226 <value>замена</value> | |
227 [<value>флаг</value>]</syntax> | |
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228 <default/> |
382 | 229 <context>server</context> |
230 <context>location</context> | |
231 <context>if</context> | |
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232 |
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233 <para> |
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234 Если указанное регулярное выражение соответствует URI, URI изменяется |
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235 в соответствии со строкой замены. |
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236 Директивы <literal>rewrite</literal> выполняются последовательно, |
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237 в порядке их следования в конфигурационном файле. |
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238 С помощью флагов можно прекратить дальнейшую обработку директив. |
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239 Если строка замены начинается с “<literal>http://</literal>” или |
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240 “<literal>https://</literal>”, то обработка завершается и клиенту |
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241 возвращается перенаправление. |
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242 </para> |
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243 |
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244 <para> |
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245 Необязательный параметр <value>флаг</value> может быть одним из: |
382 | 246 <list type="tag"> |
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247 |
382 | 248 <tag-name><literal>last</literal></tag-name> |
249 <tag-desc> | |
250 завершает обработку текущего набора директив модуля | |
251 <literal>ngx_http_rewrite_module</literal>, | |
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252 после чего ищется новый location, соответствующий изменённому URI; |
382 | 253 </tag-desc> |
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254 |
382 | 255 <tag-name><literal>break</literal></tag-name> |
256 <tag-desc> | |
257 завершает обработку текущего набора директив модуля | |
258 <literal>ngx_http_rewrite_module</literal>; | |
259 </tag-desc> | |
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260 |
382 | 261 <tag-name><literal>redirect</literal></tag-name> |
262 <tag-desc> | |
263 возвращает временное перенаправление с кодом 302; | |
264 используется, если заменяющая строка не начинается с | |
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265 “<literal>http://</literal>” или “<literal>https://</literal>”; |
382 | 266 </tag-desc> |
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267 |
382 | 268 <tag-name><literal>permanent</literal></tag-name> |
269 <tag-desc> | |
270 возвращает постоянное перенаправление с кодом 301. | |
271 </tag-desc> | |
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272 |
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273 </list> |
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274 Полный URL перенаправлений формируется согласно |
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275 схеме запроса (<var>$scheme</var>) и директив |
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276 <link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/> и |
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277 <link doc="ngx_http_core_module.xml" id="port_in_redirect"/>. |
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278 </para> |
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279 |
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280 <para> |
382 | 281 Пример: |
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282 <example> |
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283 server { |
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284 ... |
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285 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 last; |
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286 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra last; |
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287 return 403; |
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288 ... |
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289 } |
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290 </example> |
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291 </para> |
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292 |
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293 <para> |
382 | 294 Если же эти директивы поместить в location “<literal>/download/</literal>”, |
295 то нужно заменить флаг <literal>last</literal> на <literal>break</literal>, | |
296 иначе nginx сделает 10 циклов и вернёт ошибку 500: | |
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297 <example> |
382 | 298 location /download/ { |
299 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; | |
300 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra break; | |
301 return 403; | |
302 } | |
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303 </example> |
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304 </para> |
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305 |
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306 <para> |
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307 Если в строке замены указаны новые аргументы запроса, то предыдущие |
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308 аргументы запроса добавляются после них. |
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309 Если такое поведение нежелательно, можно отказаться от этого добавления, |
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310 указав в конце строки замены знак вопроса, например: |
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311 <example> |
382 | 312 rewrite ^/users/(.*)$ /show?user=$1? last; |
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313 </example> |
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314 </para> |
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315 |
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316 <para> |
382 | 317 Если в регулярном выражении встречаются символы “<literal>}</literal>” |
391
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318 или “<literal>;</literal>”, то всё выражение следует заключить в одинарные |
382 | 319 или двойные кавычки. |
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320 </para> |
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321 |
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322 </directive> |
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323 |
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324 |
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325 <directive name="set"> |
382 | 326 <syntax><value>переменная</value> <value>значение</value></syntax> |
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327 <default/> |
382 | 328 <context>server</context> |
329 <context>location</context> | |
330 <context>if</context> | |
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331 |
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332 <para> |
391
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333 Устанавливает значение указанной переменной. |
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334 В качестве значения можно использовать текст, переменные и их комбинации. |
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335 </para> |
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336 |
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337 </directive> |
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338 |
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339 |
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340 <directive name="uninitialized_variable_warn"> |
271 | 341 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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342 <default>on</default> |
382 | 343 <context>http</context> |
344 <context>server</context> | |
345 <context>location</context> | |
346 <context>if</context> | |
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347 |
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348 <para> |
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349 Определяет, нужно ли писать в лог предупреждения о неинициализированных |
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350 переменных. |
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351 </para> |
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352 |
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353 </directive> |
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354 |
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355 </section> |
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356 |
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357 |
382 | 358 <section id="internals" name="Внутреннее устройство"> |
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359 |
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360 <para> |
382 | 361 Директивы модуля <literal>ngx_http_rewrite_module</literal> |
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362 компилируются на стадии конфигурации во внутренние инструкции, |
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363 интерпретируемые во время обработки запроса. |
382 | 364 Интерпретатор представляет из себя простую стековую виртуальную машину. |
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365 </para> |
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366 |
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367 <para> |
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368 Например, директивы |
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369 <example> |
382 | 370 location /download/ { |
371 if ($forbidden) { | |
372 return 403; | |
373 } | |
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374 |
382 | 375 if ($slow) { |
376 limit_rate 10k; | |
377 } | |
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378 |
382 | 379 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
380 } | |
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381 </example> |
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382 будут транслированы в такие инструкции: |
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383 <example> |
382 | 384 переменная $forbidden |
385 проверка на ноль | |
386 возврат 403 | |
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387 завершение всего кода |
382 | 388 переменная $slow |
389 проверка на ноль | |
390 проверка регулярного выражения | |
391 копирование "/" | |
392 копирование $1 | |
393 копирование "/mp3/" | |
394 копирование $2 | |
395 копирование ".mp3" | |
396 завершение регулярного выражения | |
397 завершение всего кода | |
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398 </example> |
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399 </para> |
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400 |
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401 <para> |
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402 Обратите внимание, что инструкций для директивы |
382 | 403 <link doc="ngx_http_core_module.xml" id="limit_rate"/> |
404 нет, поскольку она не имеет отношения к модулю | |
405 <literal>ngx_http_rewrite_module</literal>. | |
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406 Для блока <link id="if"/> создаётся отдельная конфигурация, |
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407 Если условие истинно, запрос получает эту конфигурацию, |
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408 и в ней <literal>limit_rate</literal> равен 10k. |
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409 </para> |
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410 |
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411 <para> |
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412 Директиву |
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413 <example> |
382 | 414 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
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415 </example> |
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416 можно сделать на одну инструкцию меньше, если в регулярном выражении перенести |
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417 первый слэш внутрь скобок: |
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418 <example> |
382 | 419 rewrite ^(<emphasis>/</emphasis>download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; |
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420 </example> |
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421 Тогда соответствующие инструкции будут выглядеть так: |
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422 <example> |
382 | 423 проверка регулярного выражения |
424 копирование $1 | |
425 копирование "/mp3/" | |
426 копирование $2 | |
427 копирование ".mp3" | |
428 завершение регулярного выражения | |
429 завершение всего кода | |
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430 </example> |
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431 </para> |
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432 |
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433 </section> |
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434 |
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435 </module> |