Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_rewrite_module.xml @ 580:be54c443235a
Added copyright markers to documentation sources.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 10 Jul 2012 12:59:42 +0000 |
parents | 95a970603b0f |
children | 764fbac1b8b4 |
rev | line source |
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222
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1 <?xml version="1.0"?> |
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2 |
580
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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" |
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12 lang="ru"> |
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13 |
110
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14 <section id="summary"> |
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15 |
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16 <para> |
382 | 17 Модуль <literal>ngx_http_rewrite_module</literal> позволяет |
18 изменять URI с помощью регулярных выражений, делать перенаправления | |
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19 и выбирать конфигурацию по условию. |
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20 </para> |
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21 |
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22 <para> |
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23 Директивы модуля <literal>ngx_http_rewrite_module</literal> |
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24 обрабатываются в следующем порядке: |
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25 <list type="bullet"> |
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26 |
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27 <listitem> |
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28 выполняются директивы этого модуля, описанные на уровне |
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29 <link doc="ngx_http_core_module.xml" id="server">сервера</link>; |
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30 </listitem> |
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31 |
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32 <listitem> |
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33 ищется location для запроса; |
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34 </listitem> |
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35 |
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36 <listitem> |
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37 выполняются директивы этого модуля, описанные в выбранном |
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38 <link doc="ngx_http_core_module.xml" id="location"/>, |
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39 и если они изменяли URI, то ищется новый location для уже нового URI. |
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40 Этот цикл может повторяться до 10 раз, после чего возвращается |
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41 ошибка <http-status code="500" text="Internal Server Error"/>. |
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42 </listitem> |
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43 |
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44 </list> |
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45 </para> |
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46 |
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47 </section> |
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48 |
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49 |
382 | 50 <section id="directives" name="Директивы"> |
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51 |
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52 <directive name="break"> |
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53 <syntax/> |
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54 <default/> |
382 | 55 <context>server</context> |
56 <context>location</context> | |
57 <context>if</context> | |
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58 |
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59 <para> |
382 | 60 Завершает обработку текущего набора директив модуля |
61 <literal>ngx_http_rewrite_module</literal>. | |
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62 </para> |
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63 |
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64 <para> |
382 | 65 Пример: |
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66 <example> |
382 | 67 if ($slow) { |
68 limit_rate 10k; | |
69 break; | |
70 } | |
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71 </example> |
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72 </para> |
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73 |
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74 </directive> |
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75 |
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76 |
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77 <directive name="if"> |
108
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78 <syntax block="yes">(<value>условие</value>)</syntax> |
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79 <default/> |
382 | 80 <context>server</context> |
81 <context>location</context> | |
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82 |
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83 <para> |
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84 Проверяется указанное <value>условие</value>. |
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85 Если оно истинно, то выполняются указанные в фигурных скобках директивы |
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86 этого модуля и запросу назначается конфигурация, указанная внутри |
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87 директивы <literal>if</literal>. |
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88 Конфигурации внутри директив <literal>if</literal> наследуются с |
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89 предыдущего уровня конфигурации. |
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90 </para> |
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91 |
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92 <para> |
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93 В качестве условия могут быть заданы: |
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94 <list type="bullet"> |
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95 |
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96 <listitem> |
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97 имя переменной; ложными значениями переменной являются пустая строка |
382 | 98 или любая строка, начинающаяся на “<literal>0</literal>”; |
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99 </listitem> |
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100 |
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101 <listitem> |
382 | 102 сравнение переменной со строкой с помощью операторов |
103 “<literal>=</literal>” и “<literal>!=</literal>”; | |
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104 </listitem> |
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105 |
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106 <listitem> |
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107 соответствие переменной регулярному выражению с учётом |
382 | 108 регистра символов — “<literal>~</literal>” и без него — “<literal>~*</literal>”. |
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109 В регулярных выражениях можно использовать выделения, которые затем |
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110 доступны в виде переменных <var>$1</var>..<var>$9</var>. |
382 | 111 Также можно использовать отрицательные операторы “<literal>!~</literal>” |
112 и “<literal>!~*</literal>”. | |
113 Если в регулярном выражении встречаются символы “<literal>}</literal>” | |
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114 или “<literal>;</literal>”, то всё выражение следует заключить в одинарные |
382 | 115 или двойные кавычки. |
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116 </listitem> |
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117 |
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118 <listitem> |
382 | 119 проверка существования файла с помощью операторов “<literal>-f</literal>” |
120 и “<literal>!-f</literal>”; | |
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121 </listitem> |
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122 |
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123 <listitem> |
382 | 124 проверка существования каталога с помощью операторов “<literal>-d</literal>” |
125 и “<literal>!-d</literal>”; | |
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126 </listitem> |
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127 |
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128 <listitem> |
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129 проверка существования файла, каталога или символической ссылки |
382 | 130 с помощью операторов “<literal>-e</literal>” и “<literal>!-e</literal>”; |
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131 </listitem> |
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132 |
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133 <listitem> |
382 | 134 проверка исполняемости файла с помощью операторов “<literal>-x</literal>” |
135 и “<literal>!-x</literal>”. | |
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136 </listitem> |
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137 |
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138 </list> |
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139 </para> |
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140 |
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141 <para> |
382 | 142 Примеры: |
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143 <example> |
382 | 144 if ($http_user_agent ~ MSIE) { |
145 rewrite ^(.*)$ /msie/$1 break; | |
146 } | |
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147 |
382 | 148 if ($http_cookie ~* "id=([^;]+)(?:;|$)") { |
149 set $id $1; | |
150 } | |
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151 |
382 | 152 if ($request_method = POST) { |
153 return 405; | |
154 } | |
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155 |
382 | 156 if ($slow) { |
157 limit_rate 10k; | |
158 } | |
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159 |
382 | 160 if ($invalid_referer) { |
161 return 403; | |
162 } | |
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163 </example> |
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164 <note> |
382 | 165 Значение встроенной переменной <var>$invalid_referer</var> задаётся директивой |
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166 <link doc="ngx_http_referer_module.xml" id="valid_referers"/>. |
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167 </note> |
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168 </para> |
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169 |
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170 </directive> |
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171 |
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172 |
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173 <directive name="return"> |
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174 <syntax><value>код</value> [<value>текст</value>]</syntax> |
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175 <syntax><value>код</value> <value>URL</value></syntax> |
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176 <syntax><value>URL</value></syntax> |
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177 <default/> |
382 | 178 <context>server</context> |
179 <context>location</context> | |
180 <context>if</context> | |
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181 |
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182 <para> |
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183 Завершает обработку и возвращает клиенту указанный <value>код</value>. |
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184 Нестандартный код 444 закрывает соединение без передачи |
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185 заголовка ответа. |
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186 </para> |
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187 |
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188 <para> |
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189 Начиная с версии 0.8.42 можно задать |
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190 либо URL перенаправления (для кодов 301, 302, 303 и 307), |
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191 либо <value>текст</value> тела ответа (для остальных кодов). |
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192 В тексте тела ответа и URL перенаправления можно использовать переменные. |
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193 Как частный случай, URL перенаправления может быть задан как URI, |
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194 локальный для данного сервера, при этом полный URL перенаправления |
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195 формируется согласно схеме запроса (<var>$scheme</var>) и директив |
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196 <link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/> и |
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197 <link doc="ngx_http_core_module.xml" id="port_in_redirect"/>. |
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198 </para> |
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199 |
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200 <para> |
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201 Кроме того, в качестве единственного параметра можно указать |
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202 <value>URL</value> для временного перенаправления с кодом 302. |
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203 Такой параметр должен начинаться со строк “<literal>http://</literal>”, |
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204 “<literal>https://</literal>” или “<literal>$scheme</literal>”. |
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205 В <value>URL</value> можно использовать переменные. |
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206 </para> |
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207 |
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208 <para> |
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209 <note> |
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210 До версии 0.7.51 можно было возвращать только следующие коды: |
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211 204, 400, 402 — 406, 408, 410, 411, 413, 416 и 500 — 504. |
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212 </note> |
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213 |
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214 <note> |
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215 До версий 1.1.16 и 1.0.13 код 307 не обрабатывался как перенаправление. |
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216 </note> |
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217 </para> |
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218 |
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219 </directive> |
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220 |
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221 |
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222 <directive name="rewrite"> |
382 | 223 <syntax> |
224 <value>regex</value> | |
225 <value>замена</value> | |
226 [<value>флаг</value>]</syntax> | |
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227 <default/> |
382 | 228 <context>server</context> |
229 <context>location</context> | |
230 <context>if</context> | |
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231 |
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232 <para> |
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233 Если указанное регулярное выражение соответствует URI, URI изменяется |
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234 в соответствии со строкой замены. |
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235 Директивы <literal>rewrite</literal> выполняются последовательно, |
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236 в порядке их следования в конфигурационном файле. |
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237 С помощью флагов можно прекратить дальнейшую обработку директив. |
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238 Если строка замены начинается с “<literal>http://</literal>” или |
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239 “<literal>https://</literal>”, то обработка завершается и клиенту |
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240 возвращается перенаправление. |
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241 </para> |
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242 |
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243 <para> |
391
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244 Необязательный параметр <value>флаг</value> может быть одним из: |
382 | 245 <list type="tag"> |
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246 |
382 | 247 <tag-name><literal>last</literal></tag-name> |
248 <tag-desc> | |
249 завершает обработку текущего набора директив модуля | |
250 <literal>ngx_http_rewrite_module</literal>, | |
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251 после чего ищется новый location, соответствующий изменённому URI; |
382 | 252 </tag-desc> |
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253 |
382 | 254 <tag-name><literal>break</literal></tag-name> |
255 <tag-desc> | |
256 завершает обработку текущего набора директив модуля | |
257 <literal>ngx_http_rewrite_module</literal>; | |
258 </tag-desc> | |
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259 |
382 | 260 <tag-name><literal>redirect</literal></tag-name> |
261 <tag-desc> | |
262 возвращает временное перенаправление с кодом 302; | |
263 используется, если заменяющая строка не начинается с | |
391
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264 “<literal>http://</literal>” или “<literal>https://</literal>”; |
382 | 265 </tag-desc> |
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266 |
382 | 267 <tag-name><literal>permanent</literal></tag-name> |
268 <tag-desc> | |
269 возвращает постоянное перенаправление с кодом 301. | |
270 </tag-desc> | |
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271 |
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272 </list> |
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273 Полный URL перенаправлений формируется согласно |
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274 схеме запроса (<var>$scheme</var>) и директив |
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275 <link doc="ngx_http_core_module.xml" id="server_name_in_redirect"/> и |
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276 <link doc="ngx_http_core_module.xml" id="port_in_redirect"/>. |
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277 </para> |
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278 |
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279 <para> |
382 | 280 Пример: |
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281 <example> |
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282 server { |
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283 ... |
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284 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 last; |
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285 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra last; |
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286 return 403; |
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287 ... |
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288 } |
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289 </example> |
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290 </para> |
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291 |
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292 <para> |
382 | 293 Если же эти директивы поместить в location “<literal>/download/</literal>”, |
294 то нужно заменить флаг <literal>last</literal> на <literal>break</literal>, | |
295 иначе nginx сделает 10 циклов и вернёт ошибку 500: | |
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296 <example> |
382 | 297 location /download/ { |
298 rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; | |
299 rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra break; | |
300 return 403; | |
301 } | |
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302 </example> |
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303 </para> |
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304 |
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305 <para> |
391
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306 Если в строке замены указаны новые аргументы запроса, то предыдущие |
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307 аргументы запроса добавляются после них. |
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308 Если такое поведение нежелательно, можно отказаться от этого добавления, |
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309 указав в конце строки замены знак вопроса, например: |
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310 <example> |
382 | 311 rewrite ^/users/(.*)$ /show?user=$1? last; |
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312 </example> |
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313 </para> |
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314 |
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315 <para> |
382 | 316 Если в регулярном выражении встречаются символы “<literal>}</literal>” |
391
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317 или “<literal>;</literal>”, то всё выражение следует заключить в одинарные |
382 | 318 или двойные кавычки. |
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319 </para> |
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320 |
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321 </directive> |
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322 |
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323 |
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324 <directive name="set"> |
382 | 325 <syntax><value>переменная</value> <value>значение</value></syntax> |
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326 <default/> |
382 | 327 <context>server</context> |
328 <context>location</context> | |
329 <context>if</context> | |
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330 |
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331 <para> |
391
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332 Устанавливает значение указанной переменной. |
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333 В качестве значения можно использовать текст, переменные и их комбинации. |
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334 </para> |
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335 |
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336 </directive> |
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337 |
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338 |
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339 <directive name="uninitialized_variable_warn"> |
271 | 340 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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341 <default>on</default> |
382 | 342 <context>http</context> |
343 <context>server</context> | |
344 <context>location</context> | |
345 <context>if</context> | |
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346 |
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347 <para> |
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348 Определяет, нужно ли писать в лог предупреждения о неинициализированных |
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349 переменных. |
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350 </para> |
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351 |
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352 </directive> |
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353 |
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354 </section> |
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355 |
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356 |
382 | 357 <section id="internals" name="Внутреннее устройство"> |
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358 |
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359 <para> |
382 | 360 Директивы модуля <literal>ngx_http_rewrite_module</literal> |
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361 компилируются на стадии конфигурации во внутренние инструкции, |
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362 интерпретируемые во время обработки запроса. |
382 | 363 Интерпретатор представляет из себя простую стековую виртуальную машину. |
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364 </para> |
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365 |
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366 <para> |
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367 Например, директивы |
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368 <example> |
382 | 369 location /download/ { |
370 if ($forbidden) { | |
371 return 403; | |
372 } | |
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373 |
382 | 374 if ($slow) { |
375 limit_rate 10k; | |
376 } | |
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377 |
382 | 378 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
379 } | |
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380 </example> |
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381 будут транслированы в такие инструкции: |
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382 <example> |
382 | 383 переменная $forbidden |
384 проверка на ноль | |
385 возврат 403 | |
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386 завершение всего кода |
382 | 387 переменная $slow |
388 проверка на ноль | |
389 проверка регулярного выражения | |
390 копирование "/" | |
391 копирование $1 | |
392 копирование "/mp3/" | |
393 копирование $2 | |
394 копирование ".mp3" | |
395 завершение регулярного выражения | |
396 завершение всего кода | |
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397 </example> |
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398 </para> |
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399 |
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400 <para> |
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401 Обратите внимание, что инструкций для директивы |
382 | 402 <link doc="ngx_http_core_module.xml" id="limit_rate"/> |
403 нет, поскольку она не имеет отношения к модулю | |
404 <literal>ngx_http_rewrite_module</literal>. | |
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405 Для блока <link id="if"/> создаётся отдельная конфигурация, |
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406 Если условие истинно, запрос получает эту конфигурацию, |
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407 и в ней <literal>limit_rate</literal> равен 10k. |
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408 </para> |
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409 |
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410 <para> |
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411 Директиву |
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412 <example> |
382 | 413 rewrite ^/(download/.*)/media/(.*)\..*$ /$1/mp3/$2.mp3 break; |
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414 </example> |
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415 можно сделать на одну инструкцию меньше, если в регулярном выражении перенести |
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416 первый слэш внутрь скобок: |
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417 <example> |
382 | 418 rewrite ^(<emphasis>/</emphasis>download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 break; |
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419 </example> |
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420 Тогда соответствующие инструкции будут выглядеть так: |
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421 <example> |
382 | 422 проверка регулярного выражения |
423 копирование $1 | |
424 копирование "/mp3/" | |
425 копирование $2 | |
426 копирование ".mp3" | |
427 завершение регулярного выражения | |
428 завершение всего кода | |
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429 </example> |
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430 </para> |
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431 |
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432 </section> |
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433 |
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434 </module> |