Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_rewrite_module.xml @ 798:bc4923434591
Donor added.
author | Maxim Konovalov <maxim@nginx.com> |
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date | Wed, 26 Dec 2012 08:41:34 +0000 |
parents | 57fe6d7d86b4 |
children | 9fce700e56d3 |
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" |
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13 rev="3"> |
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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 | |
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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 |
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42 <link doc="ngx_http_core_module.xml" id="internal">10 раз</link>, |
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43 после чего возвращается ошибка |
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44 <http-status code="500" text="Internal Server Error"/>. |
391
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45 </listitem> |
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46 |
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47 </list> |
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48 </para> |
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49 |
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50 </section> |
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51 |
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52 |
382 | 53 <section id="directives" name="Директивы"> |
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54 |
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55 <directive name="break"> |
102
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56 <syntax/> |
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57 <default/> |
382 | 58 <context>server</context> |
59 <context>location</context> | |
60 <context>if</context> | |
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61 |
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62 <para> |
382 | 63 Завершает обработку текущего набора директив модуля |
64 <literal>ngx_http_rewrite_module</literal>. | |
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65 </para> |
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66 |
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67 <para> |
382 | 68 Пример: |
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69 <example> |
382 | 70 if ($slow) { |
71 limit_rate 10k; | |
72 break; | |
73 } | |
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74 </example> |
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75 </para> |
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76 |
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77 </directive> |
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78 |
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79 |
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80 <directive name="if"> |
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81 <syntax block="yes">(<value>условие</value>)</syntax> |
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82 <default/> |
382 | 83 <context>server</context> |
84 <context>location</context> | |
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85 |
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86 <para> |
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87 Проверяется указанное <value>условие</value>. |
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88 Если оно истинно, то выполняются указанные в фигурных скобках директивы |
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89 этого модуля и запросу назначается конфигурация, указанная внутри |
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90 директивы <literal>if</literal>. |
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91 Конфигурации внутри директив <literal>if</literal> наследуются с |
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92 предыдущего уровня конфигурации. |
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93 </para> |
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94 |
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95 <para> |
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96 В качестве условия могут быть заданы: |
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97 <list type="bullet"> |
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98 |
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99 <listitem> |
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100 имя переменной; ложными значениями переменной являются пустая строка |
382 | 101 или любая строка, начинающаяся на “<literal>0</literal>”; |
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102 </listitem> |
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103 |
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104 <listitem> |
382 | 105 сравнение переменной со строкой с помощью операторов |
106 “<literal>=</literal>” и “<literal>!=</literal>”; | |
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107 </listitem> |
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108 |
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109 <listitem> |
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110 соответствие переменной регулярному выражению с учётом |
382 | 111 регистра символов — “<literal>~</literal>” и без него — “<literal>~*</literal>”. |
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112 В регулярных выражениях можно использовать выделения, которые затем |
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113 доступны в виде переменных <var>$1</var>..<var>$9</var>. |
382 | 114 Также можно использовать отрицательные операторы “<literal>!~</literal>” |
115 и “<literal>!~*</literal>”. | |
116 Если в регулярном выражении встречаются символы “<literal>}</literal>” | |
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117 или “<literal>;</literal>”, то всё выражение следует заключить в одинарные |
382 | 118 или двойные кавычки. |
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119 </listitem> |
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120 |
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121 <listitem> |
382 | 122 проверка существования файла с помощью операторов “<literal>-f</literal>” |
123 и “<literal>!-f</literal>”; | |
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124 </listitem> |
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125 |
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126 <listitem> |
382 | 127 проверка существования каталога с помощью операторов “<literal>-d</literal>” |
128 и “<literal>!-d</literal>”; | |
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129 </listitem> |
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130 |
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131 <listitem> |
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132 проверка существования файла, каталога или символической ссылки |
382 | 133 с помощью операторов “<literal>-e</literal>” и “<literal>!-e</literal>”; |
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134 </listitem> |
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135 |
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136 <listitem> |
382 | 137 проверка исполняемости файла с помощью операторов “<literal>-x</literal>” |
138 и “<literal>!-x</literal>”. | |
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139 </listitem> |
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140 |
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141 </list> |
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142 </para> |
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143 |
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144 <para> |
382 | 145 Примеры: |
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146 <example> |
382 | 147 if ($http_user_agent ~ MSIE) { |
148 rewrite ^(.*)$ /msie/$1 break; | |
149 } | |
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150 |
382 | 151 if ($http_cookie ~* "id=([^;]+)(?:;|$)") { |
152 set $id $1; | |
153 } | |
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154 |
382 | 155 if ($request_method = POST) { |
156 return 405; | |
157 } | |
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158 |
382 | 159 if ($slow) { |
160 limit_rate 10k; | |
161 } | |
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162 |
382 | 163 if ($invalid_referer) { |
164 return 403; | |
165 } | |
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166 </example> |
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167 <note> |
382 | 168 Значение встроенной переменной <var>$invalid_referer</var> задаётся директивой |
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169 <link doc="ngx_http_referer_module.xml" id="valid_referers"/>. |
391
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170 </note> |
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171 </para> |
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172 |
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173 </directive> |
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174 |
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175 |
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176 <directive name="return"> |
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177 <syntax><value>код</value> [<value>текст</value>]</syntax> |
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178 <syntax><value>код</value> <value>URL</value></syntax> |
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179 <syntax><value>URL</value></syntax> |
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180 <default/> |
382 | 181 <context>server</context> |
182 <context>location</context> | |
183 <context>if</context> | |
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184 |
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185 <para> |
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186 Завершает обработку и возвращает клиенту указанный <value>код</value>. |
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187 Нестандартный код 444 закрывает соединение без передачи |
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188 заголовка ответа. |
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189 </para> |
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190 |
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191 <para> |
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192 Начиная с версии 0.8.42 можно задать |
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193 либо URL перенаправления (для кодов 301, 302, 303 и 307), |
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194 либо <value>текст</value> тела ответа (для остальных кодов). |
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195 В тексте тела ответа и URL перенаправления можно использовать переменные. |
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196 Как частный случай, URL перенаправления может быть задан как URI, |
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197 локальный для данного сервера, при этом полный URL перенаправления |
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198 формируется согласно схеме запроса (<var>$scheme</var>) и директив |
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199 <link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/> и |
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200 <link doc="ngx_http_core_module.xml" id="port_in_redirect"/>. |
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201 </para> |
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202 |
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203 <para> |
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204 Кроме того, в качестве единственного параметра можно указать |
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205 <value>URL</value> для временного перенаправления с кодом 302. |
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206 Такой параметр должен начинаться со строк “<literal>http://</literal>”, |
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207 “<literal>https://</literal>” или “<literal>$scheme</literal>”. |
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208 В <value>URL</value> можно использовать переменные. |
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209 </para> |
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210 |
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211 <para> |
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212 <note> |
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213 До версии 0.7.51 можно было возвращать только следующие коды: |
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214 204, 400, 402 — 406, 408, 410, 411, 413, 416 и 500 — 504. |
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215 </note> |
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216 |
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217 <note> |
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218 До версий 1.1.16 и 1.0.13 код 307 не обрабатывался как перенаправление. |
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219 </note> |
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220 </para> |
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221 |
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222 </directive> |
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223 |
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224 |
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225 <directive name="rewrite"> |
382 | 226 <syntax> |
227 <value>regex</value> | |
228 <value>замена</value> | |
229 [<value>флаг</value>]</syntax> | |
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230 <default/> |
382 | 231 <context>server</context> |
232 <context>location</context> | |
233 <context>if</context> | |
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234 |
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235 <para> |
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236 Если указанное регулярное выражение соответствует URI, URI изменяется |
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237 в соответствии со строкой замены. |
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238 Директивы <literal>rewrite</literal> выполняются последовательно, |
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239 в порядке их следования в конфигурационном файле. |
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240 С помощью флагов можно прекратить дальнейшую обработку директив. |
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241 Если строка замены начинается с “<literal>http://</literal>” или |
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242 “<literal>https://</literal>”, то обработка завершается и клиенту |
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243 возвращается перенаправление. |
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244 </para> |
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245 |
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246 <para> |
391
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247 Необязательный параметр <value>флаг</value> может быть одним из: |
382 | 248 <list type="tag"> |
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249 |
382 | 250 <tag-name><literal>last</literal></tag-name> |
251 <tag-desc> | |
252 завершает обработку текущего набора директив модуля | |
253 <literal>ngx_http_rewrite_module</literal>, | |
391
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254 после чего ищется новый location, соответствующий изменённому URI; |
382 | 255 </tag-desc> |
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256 |
382 | 257 <tag-name><literal>break</literal></tag-name> |
258 <tag-desc> | |
259 завершает обработку текущего набора директив модуля | |
260 <literal>ngx_http_rewrite_module</literal>; | |
261 </tag-desc> | |
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262 |
382 | 263 <tag-name><literal>redirect</literal></tag-name> |
264 <tag-desc> | |
265 возвращает временное перенаправление с кодом 302; | |
266 используется, если заменяющая строка не начинается с | |
391
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267 “<literal>http://</literal>” или “<literal>https://</literal>”; |
382 | 268 </tag-desc> |
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269 |
382 | 270 <tag-name><literal>permanent</literal></tag-name> |
271 <tag-desc> | |
272 возвращает постоянное перенаправление с кодом 301. | |
273 </tag-desc> | |
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274 |
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275 </list> |
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276 Полный URL перенаправлений формируется согласно |
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277 схеме запроса (<var>$scheme</var>) и директив |
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278 <link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/> и |
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279 <link doc="ngx_http_core_module.xml" id="port_in_redirect"/>. |
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280 </para> |
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281 |
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282 <para> |
382 | 283 Пример: |
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284 <example> |
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285 server { |
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286 ... |
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287 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 last; |
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288 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra last; |
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289 return 403; |
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290 ... |
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291 } |
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292 </example> |
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293 </para> |
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294 |
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295 <para> |
382 | 296 Если же эти директивы поместить в location “<literal>/download/</literal>”, |
297 то нужно заменить флаг <literal>last</literal> на <literal>break</literal>, | |
298 иначе nginx сделает 10 циклов и вернёт ошибку 500: | |
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299 <example> |
382 | 300 location /download/ { |
301 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; | |
302 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra break; | |
303 return 403; | |
304 } | |
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305 </example> |
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306 </para> |
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307 |
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308 <para> |
391
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309 Если в строке замены указаны новые аргументы запроса, то предыдущие |
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310 аргументы запроса добавляются после них. |
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311 Если такое поведение нежелательно, можно отказаться от этого добавления, |
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312 указав в конце строки замены знак вопроса, например: |
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313 <example> |
382 | 314 rewrite ^/users/(.*)$ /show?user=$1? last; |
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315 </example> |
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316 </para> |
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317 |
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318 <para> |
382 | 319 Если в регулярном выражении встречаются символы “<literal>}</literal>” |
391
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320 или “<literal>;</literal>”, то всё выражение следует заключить в одинарные |
382 | 321 или двойные кавычки. |
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322 </para> |
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323 |
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324 </directive> |
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325 |
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326 |
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327 <directive name="rewrite_log"> |
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328 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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329 <default>off</default> |
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330 <context>http</context> |
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331 <context>server</context> |
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332 <context>location</context> |
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333 <context>if</context> |
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334 |
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335 <para> |
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336 Разрешает или запрещает записывать в |
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337 <link doc="../ngx_core_module.xml" id="error_log"/> |
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338 на уровне <literal>notice</literal> |
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339 результаты обработки директив модуля <literal>ngx_http_rewrite_module</literal>. |
673
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340 </para> |
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341 |
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342 </directive> |
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343 |
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344 |
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345 <directive name="set"> |
382 | 346 <syntax><value>переменная</value> <value>значение</value></syntax> |
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347 <default/> |
382 | 348 <context>server</context> |
349 <context>location</context> | |
350 <context>if</context> | |
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351 |
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352 <para> |
391
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353 Устанавливает значение указанной переменной. |
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354 В качестве значения можно использовать текст, переменные и их комбинации. |
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355 </para> |
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356 |
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357 </directive> |
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358 |
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359 |
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360 <directive name="uninitialized_variable_warn"> |
271 | 361 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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362 <default>on</default> |
382 | 363 <context>http</context> |
364 <context>server</context> | |
365 <context>location</context> | |
366 <context>if</context> | |
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367 |
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368 <para> |
391
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369 Определяет, нужно ли писать в лог предупреждения о неинициализированных |
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370 переменных. |
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371 </para> |
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372 |
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373 </directive> |
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374 |
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375 </section> |
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376 |
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377 |
382 | 378 <section id="internals" name="Внутреннее устройство"> |
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379 |
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380 <para> |
382 | 381 Директивы модуля <literal>ngx_http_rewrite_module</literal> |
391
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382 компилируются на стадии конфигурации во внутренние инструкции, |
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383 интерпретируемые во время обработки запроса. |
382 | 384 Интерпретатор представляет из себя простую стековую виртуальную машину. |
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385 </para> |
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386 |
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387 <para> |
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388 Например, директивы |
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389 <example> |
382 | 390 location /download/ { |
391 if ($forbidden) { | |
392 return 403; | |
393 } | |
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394 |
382 | 395 if ($slow) { |
396 limit_rate 10k; | |
397 } | |
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398 |
382 | 399 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
400 } | |
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401 </example> |
391
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402 будут транслированы в такие инструкции: |
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403 <example> |
382 | 404 переменная $forbidden |
405 проверка на ноль | |
406 возврат 403 | |
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407 завершение всего кода |
382 | 408 переменная $slow |
409 проверка на ноль | |
410 проверка регулярного выражения | |
411 копирование "/" | |
412 копирование $1 | |
413 копирование "/mp3/" | |
414 копирование $2 | |
415 копирование ".mp3" | |
416 завершение регулярного выражения | |
417 завершение всего кода | |
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418 </example> |
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419 </para> |
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420 |
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421 <para> |
391
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422 Обратите внимание, что инструкций для директивы |
382 | 423 <link doc="ngx_http_core_module.xml" id="limit_rate"/> |
424 нет, поскольку она не имеет отношения к модулю | |
425 <literal>ngx_http_rewrite_module</literal>. | |
391
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426 Для блока <link id="if"/> создаётся отдельная конфигурация, |
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427 Если условие истинно, запрос получает эту конфигурацию, |
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428 и в ней <literal>limit_rate</literal> равен 10k. |
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429 </para> |
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430 |
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431 <para> |
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432 Директиву |
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433 <example> |
382 | 434 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
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435 </example> |
391
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436 можно сделать на одну инструкцию меньше, если в регулярном выражении перенести |
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437 первый слэш внутрь скобок: |
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438 <example> |
382 | 439 rewrite ^(<emphasis>/</emphasis>download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; |
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440 </example> |
391
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441 Тогда соответствующие инструкции будут выглядеть так: |
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442 <example> |
382 | 443 проверка регулярного выражения |
444 копирование $1 | |
445 копирование "/mp3/" | |
446 копирование $2 | |
447 копирование ".mp3" | |
448 завершение регулярного выражения | |
449 завершение всего кода | |
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450 </example> |
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451 </para> |
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452 |
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453 </section> |
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454 |
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455 </module> |