Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_scgi_module.xml @ 1652:68b647a96448
Documented that "map" does a caseless string comparison.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Thu, 11 Feb 2016 12:32:04 +0300 |
parents | a225fa77389a |
children | 680cbf783efe |
rev | line source |
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1180 | 1 <?xml version="1.0"?> |
2 | |
3 <!-- | |
4 Copyright (C) Igor Sysoev | |
5 Copyright (C) Nginx, Inc. | |
6 --> | |
7 | |
8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> | |
9 | |
10 <module name="Module ngx_http_scgi_module" | |
11 link="/en/docs/http/ngx_http_scgi_module.html" | |
12 lang="en" | |
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13 rev="20"> |
1180 | 14 |
15 <section id="summary"> | |
16 | |
17 <para> | |
18 The <literal>ngx_http_scgi_module</literal> module allows passing | |
19 requests to an SCGI server. | |
20 </para> | |
21 | |
22 </section> | |
23 | |
24 | |
25 <section id="example" name="Example Configuration"> | |
26 | |
27 <para> | |
28 <example> | |
29 location / { | |
30 include scgi_params; | |
31 scgi_pass localhost:9000; | |
32 } | |
33 </example> | |
34 </para> | |
35 | |
36 </section> | |
37 | |
38 | |
39 <section id="directives" name="Directives"> | |
40 | |
41 <directive name="scgi_bind"> | |
42 <syntax><value>address</value> | <literal>off</literal></syntax> | |
43 <default/> | |
44 <context>http</context> | |
45 <context>server</context> | |
46 <context>location</context> | |
47 | |
48 <para> | |
49 Makes outgoing connections to an SCGI server originate | |
50 from the specified local IP <value>address</value>. | |
51 Parameter value can contain variables (1.3.12). | |
52 The special value <literal>off</literal> (1.3.12) cancels the effect | |
53 of the <literal>scgi_bind</literal> directive | |
54 inherited from the previous configuration level, which allows the | |
55 system to auto-assign the local IP address. | |
56 </para> | |
57 | |
58 </directive> | |
59 | |
60 | |
61 <directive name="scgi_buffer_size"> | |
62 <syntax><value>size</value></syntax> | |
63 <default>4k|8k</default> | |
64 <context>http</context> | |
65 <context>server</context> | |
66 <context>location</context> | |
67 | |
68 <para> | |
69 Sets the <value>size</value> of the buffer used for reading the first part | |
70 of the response received from the SCGI server. | |
71 This part usually contains a small response header. | |
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72 By default, the buffer size is equal to one memory page. |
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73 This is either 4K or 8K, depending on a platform. |
1180 | 74 It can be made smaller, however. |
75 </para> | |
76 | |
77 </directive> | |
78 | |
79 | |
80 <directive name="scgi_buffering"> | |
81 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
82 <default>on</default> | |
83 <context>http</context> | |
84 <context>server</context> | |
85 <context>location</context> | |
86 | |
87 <para> | |
88 Enables or disables buffering of responses from the SCGI server. | |
89 </para> | |
90 | |
91 <para> | |
92 When buffering is enabled, nginx receives a response from the SCGI server | |
93 as soon as possible, saving it into the buffers set by the | |
94 <link id="scgi_buffer_size"/> and <link id="scgi_buffers"/> directives. | |
95 If the whole response does not fit into memory, a part of it can be saved | |
96 to a <link id="scgi_temp_path">temporary file</link> on the disk. | |
97 Writing to temporary files is controlled by the | |
98 <link id="scgi_max_temp_file_size"/> and | |
99 <link id="scgi_temp_file_write_size"/> directives. | |
100 </para> | |
101 | |
102 <para> | |
103 When buffering is disabled, the response is passed to a client synchronously, | |
104 immediately as it is received. | |
105 nginx will not try to read the whole response from the SCGI server. | |
106 The maximum size of the data that nginx can receive from the server | |
107 at a time is set by the <link id="scgi_buffer_size"/> directive. | |
108 </para> | |
109 | |
110 <para> | |
111 Buffering can also be enabled or disabled by passing | |
112 “<literal>yes</literal>” or “<literal>no</literal>” in the | |
113 <header>X-Accel-Buffering</header> response header field. | |
114 This capability can be disabled using the | |
115 <link id="scgi_ignore_headers"/> directive. | |
116 </para> | |
117 | |
118 </directive> | |
119 | |
120 | |
121 <directive name="scgi_buffers"> | |
122 <syntax><value>number</value> <value>size</value></syntax> | |
123 <default>8 4k|8k</default> | |
124 <context>http</context> | |
125 <context>server</context> | |
126 <context>location</context> | |
127 | |
128 <para> | |
129 Sets the <value>number</value> and <value>size</value> of the | |
130 buffers used for reading a response from the SCGI server, | |
131 for a single connection. | |
132 By default, the buffer size is equal to one memory page. | |
133 This is either 4K or 8K, depending on a platform. | |
134 </para> | |
135 | |
136 </directive> | |
137 | |
138 | |
139 <directive name="scgi_busy_buffers_size"> | |
140 <syntax><value>size</value></syntax> | |
141 <default>8k|16k</default> | |
142 <context>http</context> | |
143 <context>server</context> | |
144 <context>location</context> | |
145 | |
146 <para> | |
147 When <link id="scgi_buffering">buffering</link> of responses from the SCGI | |
148 server is enabled, limits the total <value>size</value> of buffers that | |
149 can be busy sending a response to the client while the response is not | |
150 yet fully read. | |
151 In the meantime, the rest of the buffers can be used for reading the response | |
152 and, if needed, buffering part of the response to a temporary file. | |
153 By default, <value>size</value> is limited by the size of two buffers set by the | |
154 <link id="scgi_buffer_size"/> and <link id="scgi_buffers"/> directives. | |
155 </para> | |
156 | |
157 </directive> | |
158 | |
159 | |
160 <directive name="scgi_cache"> | |
161 <syntax><value>zone</value> | <literal>off</literal></syntax> | |
162 <default>off</default> | |
163 <context>http</context> | |
164 <context>server</context> | |
165 <context>location</context> | |
166 | |
167 <para> | |
168 Defines a shared memory zone used for caching. | |
169 The same zone can be used in several places. | |
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170 Parameter value can contain variables (1.7.9). |
1180 | 171 The <literal>off</literal> parameter disables caching inherited |
172 from the previous configuration level. | |
173 </para> | |
174 | |
175 </directive> | |
176 | |
177 | |
178 <directive name="scgi_cache_bypass"> | |
179 <syntax><value>string</value> ...</syntax> | |
180 <default/> | |
181 <context>http</context> | |
182 <context>server</context> | |
183 <context>location</context> | |
184 | |
185 <para> | |
186 Defines conditions under which the response will not be taken from a cache. | |
187 If at least one value of the string parameters is not empty and is not | |
188 equal to “0” then the response will not be taken from the cache: | |
189 <example> | |
190 scgi_cache_bypass $cookie_nocache $arg_nocache$arg_comment; | |
191 scgi_cache_bypass $http_pragma $http_authorization; | |
192 </example> | |
193 Can be used along with the <link id="scgi_no_cache"/> directive. | |
194 </para> | |
195 | |
196 </directive> | |
197 | |
198 | |
199 <directive name="scgi_cache_key"> | |
200 <syntax><value>string</value></syntax> | |
201 <default/> | |
202 <context>http</context> | |
203 <context>server</context> | |
204 <context>location</context> | |
205 | |
206 <para> | |
207 Defines a key for caching, for example | |
208 <example> | |
209 scgi_cache_key localhost:9000$request_uri; | |
210 </example> | |
211 </para> | |
212 | |
213 </directive> | |
214 | |
215 | |
216 <directive name="scgi_cache_lock"> | |
217 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
218 <default>off</default> | |
219 <context>http</context> | |
220 <context>server</context> | |
221 <context>location</context> | |
222 <appeared-in>1.1.12</appeared-in> | |
223 | |
224 <para> | |
225 When enabled, only one request at a time will be allowed to populate | |
226 a new cache element identified according to the <link id="scgi_cache_key"/> | |
227 directive by passing a request to an SCGI server. | |
228 Other requests of the same cache element will either wait | |
229 for a response to appear in the cache or the cache lock for | |
230 this element to be released, up to the time set by the | |
231 <link id="scgi_cache_lock_timeout"/> directive. | |
232 </para> | |
233 | |
234 </directive> | |
235 | |
236 | |
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237 <directive name="scgi_cache_lock_age"> |
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238 <syntax><value>time</value></syntax> |
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239 <default>5s</default> |
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240 <context>http</context> |
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241 <context>server</context> |
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242 <context>location</context> |
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243 <appeared-in>1.7.8</appeared-in> |
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244 |
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245 <para> |
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246 If the last request passed to the SCGI server |
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247 for populating a new cache element |
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248 has not completed for the specified <value>time</value>, |
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249 one more request may be passed to the SCGI server. |
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250 </para> |
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251 |
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252 </directive> |
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253 |
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254 |
1180 | 255 <directive name="scgi_cache_lock_timeout"> |
256 <syntax><value>time</value></syntax> | |
257 <default>5s</default> | |
258 <context>http</context> | |
259 <context>server</context> | |
260 <context>location</context> | |
261 <appeared-in>1.1.12</appeared-in> | |
262 | |
263 <para> | |
264 Sets a timeout for <link id="scgi_cache_lock"/>. | |
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265 When the <value>time</value> expires, |
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266 the request will be passed to the SCGI server, |
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267 however, the response will not be cached. |
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268 <note> |
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269 Before 1.7.8, the response could be cached. |
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270 </note> |
1180 | 271 </para> |
272 | |
273 </directive> | |
274 | |
275 | |
276 <directive name="scgi_cache_methods"> | |
277 <syntax> | |
278 <literal>GET</literal> | | |
279 <literal>HEAD</literal> | | |
280 <literal>POST</literal> | |
281 ...</syntax> | |
282 <default>GET HEAD</default> | |
283 <context>http</context> | |
284 <context>server</context> | |
285 <context>location</context> | |
286 | |
287 <para> | |
288 If the client request method is listed in this directive then | |
289 the response will be cached. | |
290 “<literal>GET</literal>” and “<literal>HEAD</literal>” methods are always | |
291 added to the list, though it is recommended to specify them explicitly. | |
292 See also the <link id="scgi_no_cache"/> directive. | |
293 </para> | |
294 | |
295 </directive> | |
296 | |
297 | |
298 <directive name="scgi_cache_min_uses"> | |
299 <syntax><value>number</value></syntax> | |
300 <default>1</default> | |
301 <context>http</context> | |
302 <context>server</context> | |
303 <context>location</context> | |
304 | |
305 <para> | |
306 Sets the <value>number</value> of requests after which the response | |
307 will be cached. | |
308 </para> | |
309 | |
310 </directive> | |
311 | |
312 | |
313 <directive name="scgi_cache_path"> | |
314 <syntax> | |
315 <value>path</value> | |
316 [<literal>levels</literal>=<value>levels</value>] | |
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317 [<literal>use_temp_path</literal>=<literal>on</literal>|<literal>off</literal>] |
1180 | 318 <literal>keys_zone</literal>=<value>name</value>:<value>size</value> |
319 [<literal>inactive</literal>=<value>time</value>] | |
320 [<literal>max_size</literal>=<value>size</value>] | |
321 [<literal>loader_files</literal>=<value>number</value>] | |
322 [<literal>loader_sleep</literal>=<value>time</value>] | |
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323 [<literal>loader_threshold</literal>=<value>time</value>] |
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324 [<literal>purger</literal>=<literal>on</literal>|<literal>off</literal>] |
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325 [<literal>purger_files</literal>=<value>number</value>] |
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326 [<literal>purger_sleep</literal>=<value>time</value>] |
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327 [<literal>purger_threshold</literal>=<value>time</value>]</syntax> |
1180 | 328 <default/> |
329 <context>http</context> | |
330 | |
331 <para> | |
332 Sets the path and other parameters of a cache. | |
333 Cache data are stored in files. | |
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334 The file name in a cache is a result of |
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335 applying the MD5 function to the |
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336 <link id="scgi_cache_key">cache key</link>. |
1180 | 337 The <literal>levels</literal> parameter defines hierarchy levels of a cache. |
338 For example, in the following configuration | |
339 <example> | |
340 scgi_cache_path /data/nginx/cache levels=1:2 keys_zone=one:10m; | |
341 </example> | |
342 file names in a cache will look like this: | |
343 <example> | |
344 /data/nginx/cache/<emphasis>c</emphasis>/<emphasis>29</emphasis>/b7f54b2df7773722d382f4809d650<emphasis>29c</emphasis> | |
345 </example> | |
346 </para> | |
347 | |
348 <para> | |
349 A cached response is first written to a temporary file, | |
350 and then the file is renamed. | |
351 Starting from version 0.8.9, temporary files and the cache can be put on | |
352 different file systems. | |
353 However, be aware that in this case a file is copied | |
354 across two file systems instead of the cheap renaming operation. | |
355 It is thus recommended that for any given location both cache and a directory | |
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356 holding temporary files |
1180 | 357 are put on the same file system. |
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358 A directory for temporary files is set based on |
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359 the <literal>use_temp_path</literal> parameter (1.7.10). |
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360 If this parameter is omitted or set to the value <literal>on</literal>, |
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361 the directory set by the <link id="scgi_temp_path"/> directive |
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362 for the given location will be used. |
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363 If the value is set to <literal>off</literal>, |
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364 temporary files will be put directly in the cache directory. |
1180 | 365 </para> |
366 | |
367 <para> | |
368 In addition, all active keys and information about data are stored | |
369 in a shared memory zone, whose <value>name</value> and <value>size</value> | |
370 are configured by the <literal>keys_zone</literal> parameter. | |
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371 One megabyte zone can store about 8 thousand keys. |
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372 </para> |
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373 |
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374 <para> |
1180 | 375 Cached data that are not accessed during the time specified by the |
376 <literal>inactive</literal> parameter get removed from the cache | |
377 regardless of their freshness. | |
378 By default, <literal>inactive</literal> is set to 10 minutes. | |
379 </para> | |
380 | |
381 <para> | |
382 The special “cache manager” process monitors the maximum cache size set | |
383 by the <literal>max_size</literal> parameter. | |
384 When this size is exceeded, it removes the least recently used data. | |
385 </para> | |
386 | |
387 <para> | |
388 A minute after the start the special “cache loader” process is activated. | |
389 It loads information about previously cached data stored on file system | |
390 into a cache zone. | |
391 The loading is done in iterations. | |
392 During one iteration no more than <literal>loader_files</literal> items | |
393 are loaded (by default, 100). | |
394 Besides, the duration of one iteration is limited by the | |
395 <literal>loader_threshold</literal> parameter (by default, 200 milliseconds). | |
396 Between iterations, a pause configured by the <literal>loader_sleep</literal> | |
397 parameter (by default, 50 milliseconds) is made. | |
398 </para> | |
399 | |
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400 <para> |
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401 Additionally, |
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402 the following parameters are available as part of our |
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403 <commercial_version>commercial subscription</commercial_version>: |
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404 </para> |
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405 |
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406 <para> |
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407 <list type="tag"> |
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408 |
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409 <tag-name id="purger"> |
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410 <literal>purger</literal>=<literal>on</literal>|<literal>off</literal> |
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411 </tag-name> |
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412 <tag-desc> |
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413 Instructs whether cache entries that match a |
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414 <link id="scgi_cache_purge">wildcard key</link> |
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415 will be removed from the disk by the cache purger (1.7.12). |
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416 Setting the parameter to <literal>on</literal> |
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417 (default is <literal>off</literal>) |
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418 will activate the “cache purger” process that |
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419 permanently iterates through all cache entries |
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420 and deletes the entries that match the wildcard key. |
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421 </tag-desc> |
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422 |
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423 <tag-name id="purger_files"> |
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424 <literal>purger_files</literal>=<value>number</value> |
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425 </tag-name> |
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426 <tag-desc> |
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427 Sets the number of items that will be scanned during one iteration (1.7.12). |
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428 By default, <literal>purger_files</literal> is set to 10. |
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429 </tag-desc> |
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430 |
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431 <tag-name id="purger_threshold"> |
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432 <literal>purger_threshold</literal>=<value>number</value> |
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433 </tag-name> |
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434 <tag-desc> |
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435 Sets the duration of one iteration (1.7.12). |
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436 By default, <literal>purger_threshold</literal> is set to 50 milliseconds. |
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437 </tag-desc> |
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438 |
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439 <tag-name id="purger_sleep"> |
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440 <literal>purger_sleep</literal>=<value>number</value> |
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441 </tag-name> |
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442 <tag-desc> |
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443 Sets a pause between iterations (1.7.12). |
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444 By default, <literal>purger_sleep</literal> is set to 50 milliseconds. |
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445 </tag-desc> |
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446 |
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447 </list> |
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448 </para> |
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449 |
1180 | 450 </directive> |
451 | |
452 | |
453 <directive name="scgi_cache_purge"> | |
454 <syntax>string ...</syntax> | |
455 <default/> | |
456 <context>http</context> | |
457 <context>server</context> | |
458 <context>location</context> | |
459 <appeared-in>1.5.7</appeared-in> | |
460 | |
461 <para> | |
462 Defines conditions under which the request will be considered a cache | |
463 purge request. | |
464 If at least one value of the string parameters is not empty and is not equal | |
465 to “0” then the cache entry with a corresponding | |
466 <link id="scgi_cache_key">cache key</link> is removed. | |
467 The result of successful operation is indicated by returning | |
468 the <http-status code="204" text="No Content"/> response. | |
469 </para> | |
470 | |
471 <para> | |
472 If the <link id="scgi_cache_key">cache key</link> of a purge request ends | |
473 with an asterisk (“<literal>*</literal>”), all cache entries matching the | |
474 wildcard key will be removed from the cache. | |
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475 However, these entries will remain on the disk until they are deleted |
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476 for either <link id="scgi_cache_path">inactivity</link>, |
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477 or processed by the <link id="purger">cache purger</link> (1.7.12), |
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478 or a client attempts to access them. |
1180 | 479 </para> |
480 | |
481 <para> | |
482 Example configuration: | |
483 <example> | |
484 scgi_cache_path /data/nginx/cache keys_zone=cache_zone:10m; | |
485 | |
486 map $request_method $purge_method { | |
487 PURGE 1; | |
488 default 0; | |
489 } | |
490 | |
491 server { | |
492 ... | |
493 location / { | |
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494 scgi_pass backend; |
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495 scgi_cache cache_zone; |
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496 scgi_cache_key $uri; |
1180 | 497 scgi_cache_purge $purge_method; |
498 } | |
499 } | |
500 </example> | |
501 <note> | |
502 This functionality is available as part of our | |
503 <commercial_version>commercial subscription</commercial_version>. | |
504 </note> | |
505 </para> | |
506 | |
507 </directive> | |
508 | |
509 | |
510 <directive name="scgi_cache_revalidate"> | |
511 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
512 <default>off</default> | |
513 <context>http</context> | |
514 <context>server</context> | |
515 <context>location</context> | |
516 <appeared-in>1.5.7</appeared-in> | |
517 | |
518 <para> | |
519 Enables revalidation of expired cache items using conditional requests with | |
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520 the <header>If-Modified-Since</header> and <header>If-None-Match</header> |
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521 header fields. |
1180 | 522 </para> |
523 | |
524 </directive> | |
525 | |
526 | |
527 <directive name="scgi_cache_use_stale"> | |
528 <syntax> | |
529 <literal>error</literal> | | |
530 <literal>timeout</literal> | | |
531 <literal>invalid_header</literal> | | |
532 <literal>updating</literal> | | |
533 <literal>http_500</literal> | | |
534 <literal>http_503</literal> | | |
535 <literal>http_403</literal> | | |
536 <literal>http_404</literal> | | |
537 <literal>off</literal> | |
538 ...</syntax> | |
539 <default>off</default> | |
540 <context>http</context> | |
541 <context>server</context> | |
542 <context>location</context> | |
543 | |
544 <para> | |
545 Determines in which cases a stale cached response can be used | |
546 when an error occurs during communication with the SCGI server. | |
547 The directive’s parameters match the parameters of the | |
548 <link id="scgi_next_upstream"/> directive. | |
549 </para> | |
550 | |
551 <para> | |
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552 The <literal>error</literal> parameter also permits |
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553 using a stale cached response if an SCGI server to process a request |
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554 cannot be selected. |
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555 </para> |
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556 |
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557 <para> |
1180 | 558 Additionally, the <literal>updating</literal> parameter permits |
559 using a stale cached response if it is currently being updated. | |
560 This allows minimizing the number of accesses to SCGI servers | |
561 when updating cached data. | |
562 </para> | |
563 | |
564 <para> | |
565 To minimize the number of accesses to SCGI servers when | |
566 populating a new cache element, the <link id="scgi_cache_lock"/> | |
567 directive can be used. | |
568 </para> | |
569 | |
570 </directive> | |
571 | |
572 | |
573 <directive name="scgi_cache_valid"> | |
574 <syntax>[<value>code</value> ...] <value>time</value></syntax> | |
575 <default/> | |
576 <context>http</context> | |
577 <context>server</context> | |
578 <context>location</context> | |
579 | |
580 <para> | |
581 Sets caching time for different response codes. | |
582 For example, the following directives | |
583 <example> | |
584 scgi_cache_valid 200 302 10m; | |
585 scgi_cache_valid 404 1m; | |
586 </example> | |
587 set 10 minutes of caching for responses with codes 200 and 302 | |
588 and 1 minute for responses with code 404. | |
589 </para> | |
590 | |
591 <para> | |
592 If only caching <value>time</value> is specified | |
593 <example> | |
594 scgi_cache_valid 5m; | |
595 </example> | |
596 then only 200, 301, and 302 responses are cached. | |
597 </para> | |
598 | |
599 <para> | |
600 In addition, the <literal>any</literal> parameter can be specified | |
601 to cache any responses: | |
602 <example> | |
603 scgi_cache_valid 200 302 10m; | |
604 scgi_cache_valid 301 1h; | |
605 scgi_cache_valid any 1m; | |
606 </example> | |
607 </para> | |
608 | |
609 <para> | |
610 Parameters of caching can also be set directly | |
611 in the response header. | |
612 This has higher priority than setting of caching time using the directive. | |
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613 <list type="bullet" compact="no"> |
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614 |
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615 <listitem> |
1180 | 616 The <header>X-Accel-Expires</header> header field sets caching time of a |
617 response in seconds. | |
618 The zero value disables caching for a response. | |
619 If the value starts with the <literal>@</literal> prefix, it sets an absolute | |
620 time in seconds since Epoch, up to which the response may be cached. | |
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621 </listitem> |
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622 |
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623 <listitem> |
1180 | 624 If the header does not include the <header>X-Accel-Expires</header> field, |
625 parameters of caching may be set in the header fields | |
626 <header>Expires</header> or <header>Cache-Control</header>. | |
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627 </listitem> |
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628 |
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629 <listitem> |
1180 | 630 If the header includes the <header>Set-Cookie</header> field, such a |
631 response will not be cached. | |
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632 </listitem> |
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633 |
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634 <listitem> |
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635 If the header includes the <header>Vary</header> field |
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636 with the special value “<literal>*</literal>”, such a |
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637 response will not be cached (1.7.7). |
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638 If the header includes the <header>Vary</header> field |
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639 with another value, such a response will be cached |
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640 taking into account the corresponding request header fields (1.7.7). |
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641 </listitem> |
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642 |
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643 </list> |
1180 | 644 Processing of one or more of these response header fields can be disabled |
645 using the <link id="scgi_ignore_headers"/> directive. | |
646 </para> | |
647 | |
648 </directive> | |
649 | |
650 | |
651 <directive name="scgi_connect_timeout"> | |
652 <syntax><value>time</value></syntax> | |
653 <default>60s</default> | |
654 <context>http</context> | |
655 <context>server</context> | |
656 <context>location</context> | |
657 | |
658 <para> | |
659 Defines a timeout for establishing a connection with an SCGI server. | |
660 It should be noted that this timeout cannot usually exceed 75 seconds. | |
661 </para> | |
662 | |
663 </directive> | |
664 | |
665 | |
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666 <directive name="scgi_force_ranges"> |
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667 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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668 <default>off</default> |
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669 <context>http</context> |
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670 <context>server</context> |
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671 <context>location</context> |
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672 <appeared-in>1.7.7</appeared-in> |
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673 |
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674 <para> |
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675 Enables byte-range support |
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676 for both cached and uncached responses from the SCGI server |
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677 regardless of the <header>Accept-Ranges</header> field in these responses. |
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678 </para> |
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679 |
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680 </directive> |
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681 |
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682 |
1180 | 683 <directive name="scgi_hide_header"> |
684 <syntax><value>field</value></syntax> | |
685 <default/> | |
686 <context>http</context> | |
687 <context>server</context> | |
688 <context>location</context> | |
689 | |
690 <para> | |
691 By default, | |
692 nginx does not pass the header fields <header>Status</header> and | |
693 <header>X-Accel-...</header> from the response of an SCGI | |
694 server to a client. | |
695 The <literal>scgi_hide_header</literal> directive sets additional fields | |
696 that will not be passed. | |
697 If, on the contrary, the passing of fields needs to be permitted, | |
698 the <link id="scgi_pass_header"/> directive can be used. | |
699 </para> | |
700 | |
701 </directive> | |
702 | |
703 | |
704 <directive name="scgi_ignore_client_abort"> | |
705 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
706 <default>off</default> | |
707 <context>http</context> | |
708 <context>server</context> | |
709 <context>location</context> | |
710 | |
711 <para> | |
712 Determines whether the connection with an SCGI server should be | |
713 closed when a client closes the connection without waiting | |
714 for a response. | |
715 </para> | |
716 | |
717 </directive> | |
718 | |
719 | |
720 <directive name="scgi_ignore_headers"> | |
721 <syntax><value>field</value> ...</syntax> | |
722 <default/> | |
723 <context>http</context> | |
724 <context>server</context> | |
725 <context>location</context> | |
726 | |
727 <para> | |
728 Disables processing of certain response header fields from the SCGI server. | |
729 The following fields can be ignored: <header>X-Accel-Redirect</header>, | |
730 <header>X-Accel-Expires</header>, <header>X-Accel-Limit-Rate</header> (1.1.6), | |
731 <header>X-Accel-Buffering</header> (1.1.6), | |
732 <header>X-Accel-Charset</header> (1.1.6), <header>Expires</header>, | |
1345
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733 <header>Cache-Control</header>, <header>Set-Cookie</header> (0.8.44), |
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734 and <header>Vary</header> (1.7.7). |
1180 | 735 </para> |
736 | |
737 <para> | |
738 If not disabled, processing of these header fields has the following | |
739 effect: | |
740 <list type="bullet" compact="no"> | |
741 | |
742 <listitem> | |
743 <header>X-Accel-Expires</header>, <header>Expires</header>, | |
1345
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744 <header>Cache-Control</header>, <header>Set-Cookie</header>, |
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745 and <header>Vary</header> |
1180 | 746 set the parameters of response <link id="scgi_cache_valid">caching</link>; |
747 </listitem> | |
748 | |
749 <listitem> | |
750 <header>X-Accel-Redirect</header> performs an | |
751 <link doc="ngx_http_core_module.xml" id="internal">internal | |
752 redirect</link> to the specified URI; | |
753 </listitem> | |
754 | |
755 <listitem> | |
756 <header>X-Accel-Limit-Rate</header> sets the | |
757 <link doc="ngx_http_core_module.xml" id="limit_rate">rate | |
758 limit</link> for transmission of a response to a client; | |
759 </listitem> | |
760 | |
761 <listitem> | |
762 <header>X-Accel-Buffering</header> enables or disables | |
763 <link id="scgi_buffering">buffering</link> of a response; | |
764 </listitem> | |
765 | |
766 <listitem> | |
767 <header>X-Accel-Charset</header> sets the desired | |
768 <link doc="ngx_http_charset_module.xml" id="charset"/> | |
769 of a response. | |
770 </listitem> | |
771 | |
772 </list> | |
773 </para> | |
774 | |
775 </directive> | |
776 | |
777 | |
778 <directive name="scgi_intercept_errors"> | |
779 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
780 <default>off</default> | |
781 <context>http</context> | |
782 <context>server</context> | |
783 <context>location</context> | |
784 | |
785 <para> | |
786 Determines whether an SCGI server responses with codes greater than or equal | |
787 to 300 should be passed to a client or be redirected to nginx for processing | |
788 with the <link doc="ngx_http_core_module.xml" id="error_page"/> directive. | |
789 </para> | |
790 | |
791 </directive> | |
792 | |
793 | |
1342
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794 <directive name="scgi_limit_rate"> |
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795 <syntax><value>rate</value></syntax> |
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796 <default>0</default> |
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797 <context>http</context> |
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798 <context>server</context> |
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799 <context>location</context> |
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800 <appeared-in>1.7.7</appeared-in> |
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801 |
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802 <para> |
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803 Limits the speed of reading the response from the SCGI server. |
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804 The <value>rate</value> is specified in bytes per second. |
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805 The zero value disables rate limiting. |
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806 The limit is set per a request, and so if nginx simultaneously opens |
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807 two connections to the SCGI server, |
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808 the overall rate will be twice as much as the specified limit. |
1342
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809 The limitation works only if |
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810 <link id="scgi_buffering">buffering</link> of responses from the SCGI |
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811 server is enabled. |
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812 </para> |
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813 |
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814 </directive> |
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815 |
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816 |
1180 | 817 <directive name="scgi_max_temp_file_size"> |
818 <syntax><value>size</value></syntax> | |
819 <default>1024m</default> | |
820 <context>http</context> | |
821 <context>server</context> | |
822 <context>location</context> | |
823 | |
824 <para> | |
825 When <link id="scgi_buffering">buffering</link> of responses from the SCGI | |
826 server is enabled, and the whole response does not fit into the buffers | |
827 set by the <link id="scgi_buffer_size"/> and <link id="scgi_buffers"/> | |
828 directives, a part of the response can be saved to a temporary file. | |
829 This directive sets the maximum <value>size</value> of the temporary file. | |
830 The size of data written to the temporary file at a time is set | |
831 by the <link id="scgi_temp_file_write_size"/> directive. | |
832 </para> | |
833 | |
834 <para> | |
835 The zero value disables buffering of responses to temporary files. | |
836 </para> | |
837 | |
1352
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838 <para> |
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839 <note> |
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840 This restriction does not apply to responses |
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841 that will be <link id="scgi_cache">cached</link> |
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842 or <link id="scgi_store">stored</link> on disk. |
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843 </note> |
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844 </para> |
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845 |
1180 | 846 </directive> |
847 | |
848 | |
849 <directive name="scgi_next_upstream"> | |
850 <syntax> | |
851 <literal>error</literal> | | |
852 <literal>timeout</literal> | | |
853 <literal>invalid_header</literal> | | |
854 <literal>http_500</literal> | | |
855 <literal>http_503</literal> | | |
856 <literal>http_403</literal> | | |
857 <literal>http_404</literal> | | |
858 <literal>off</literal> | |
859 ...</syntax> | |
860 <default>error timeout</default> | |
861 <context>http</context> | |
862 <context>server</context> | |
863 <context>location</context> | |
864 | |
865 <para> | |
866 Specifies in which cases a request should be passed to the next server: | |
867 <list type="tag"> | |
868 | |
869 <tag-name><literal>error</literal></tag-name> | |
870 <tag-desc>an error occurred while establishing a connection with the | |
871 server, passing a request to it, or reading the response header;</tag-desc> | |
872 | |
873 <tag-name><literal>timeout</literal></tag-name> | |
874 <tag-desc>a timeout has occurred while establishing a connection with the | |
875 server, passing a request to it, or reading the response header;</tag-desc> | |
876 | |
877 <tag-name><literal>invalid_header</literal></tag-name> | |
878 <tag-desc>a server returned an empty or invalid response;</tag-desc> | |
879 | |
880 <tag-name><literal>http_500</literal></tag-name> | |
881 <tag-desc>a server returned a response with the code 500;</tag-desc> | |
882 | |
883 <tag-name><literal>http_503</literal></tag-name> | |
884 <tag-desc>a server returned a response with the code 503;</tag-desc> | |
885 | |
886 <tag-name><literal>http_403</literal></tag-name> | |
887 <tag-desc>a server returned a response with the code 403;</tag-desc> | |
888 | |
889 <tag-name><literal>http_404</literal></tag-name> | |
890 <tag-desc>a server returned a response with the code 404;</tag-desc> | |
891 | |
892 <tag-name><literal>off</literal></tag-name> | |
893 <tag-desc>disables passing a request to the next server.</tag-desc> | |
894 | |
895 </list> | |
896 </para> | |
897 | |
898 <para> | |
899 One should bear in mind that passing a request to the next server is | |
900 only possible if nothing has been sent to a client yet. | |
901 That is, if an error or timeout occurs in the middle of the | |
902 transferring of a response, fixing this is impossible. | |
903 </para> | |
904 | |
905 <para> | |
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906 The directive also defines what is considered an |
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907 <link doc="ngx_http_upstream_module.xml" id="max_fails">unsuccessful |
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908 attempt</link> of communication with a server. |
1180 | 909 The cases of <literal>error</literal>, <literal>timeout</literal> and |
910 <literal>invalid_header</literal> are always considered unsuccessful attempts, | |
911 even if they are not specified in the directive. | |
912 The cases of <literal>http_500</literal> and <literal>http_503</literal> are | |
913 considered unsuccessful attempts only if they are specified in the directive. | |
914 The cases of <literal>http_403</literal> and <literal>http_404</literal> | |
915 are never considered unsuccessful attempts. | |
916 </para> | |
917 | |
1290
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918 <para> |
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|
919 Passing a request to the next server can be limited by |
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|
920 <link id="scgi_next_upstream_tries">the number of tries</link> |
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921 and by <link id="scgi_next_upstream_timeout">time</link>. |
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922 </para> |
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923 |
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924 </directive> |
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925 |
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926 |
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927 <directive name="scgi_next_upstream_timeout"> |
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928 <syntax><value>time</value></syntax> |
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929 <default>0</default> |
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930 <context>http</context> |
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|
931 <context>server</context> |
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932 <context>location</context> |
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|
933 <appeared-in>1.7.5</appeared-in> |
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934 |
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935 <para> |
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|
936 Limits the time allowed to pass a request to the |
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|
937 <link id="scgi_next_upstream">next server</link>. |
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|
938 The <literal>0</literal> value turns off this limitation. |
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939 </para> |
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940 |
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941 </directive> |
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|
942 |
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|
943 |
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|
944 <directive name="scgi_next_upstream_tries"> |
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|
945 <syntax><value>number</value></syntax> |
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|
946 <default>0</default> |
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947 <context>http</context> |
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|
948 <context>server</context> |
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|
949 <context>location</context> |
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|
950 <appeared-in>1.7.5</appeared-in> |
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|
951 |
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|
952 <para> |
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|
953 Limits the number of possible tries for passing a request to the |
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954 <link id="scgi_next_upstream">next server</link>. |
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|
955 The <literal>0</literal> value turns off this limitation. |
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|
956 </para> |
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957 |
1180 | 958 </directive> |
959 | |
960 | |
961 <directive name="scgi_no_cache"> | |
962 <syntax><value>string</value> ...</syntax> | |
963 <default/> | |
964 <context>http</context> | |
965 <context>server</context> | |
966 <context>location</context> | |
967 | |
968 <para> | |
969 Defines conditions under which the response will not be saved to a cache. | |
970 If at least one value of the string parameters is not empty and is not | |
971 equal to “0” then the response will not be saved: | |
972 <example> | |
973 scgi_no_cache $cookie_nocache $arg_nocache$arg_comment; | |
974 scgi_no_cache $http_pragma $http_authorization; | |
975 </example> | |
976 Can be used along with the <link id="scgi_cache_bypass"/> directive. | |
977 </para> | |
978 | |
979 </directive> | |
980 | |
981 | |
982 <directive name="scgi_param"> | |
983 <syntax> | |
984 <value>parameter</value> <value>value</value> | |
985 [<literal>if_not_empty</literal>]</syntax> | |
986 <default/> | |
987 <context>http</context> | |
988 <context>server</context> | |
989 <context>location</context> | |
990 | |
991 <para> | |
992 Sets a <value>parameter</value> that should be passed to the SCGI server. | |
993 The <value>value</value> can contain text, variables, and their combination. | |
994 These directives are inherited from the previous level if and | |
995 only if there are no | |
996 <literal>scgi_param</literal> | |
997 directives defined on the current level. | |
998 </para> | |
999 | |
1000 <para> | |
1001 Standard | |
1002 <link url="http://tools.ietf.org/html/rfc3875#section-4.1">CGI | |
1003 environment variables</link> | |
1004 should be provided as SCGI headers, see the <path>scgi_params</path> file | |
1005 provided in the distribution: | |
1006 <example> | |
1007 location / { | |
1008 include scgi_params; | |
1009 ... | |
1010 } | |
1011 </example> | |
1012 </para> | |
1013 | |
1182
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1014 <para> |
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1015 If a directive is specified with <literal>if_not_empty</literal> (1.1.11) then |
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1016 such a parameter will not be passed to the server until its value is not empty: |
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1017 <example> |
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|
1018 scgi_param HTTPS $https if_not_empty; |
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1019 </example> |
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1020 </para> |
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1021 |
1180 | 1022 </directive> |
1023 | |
1024 | |
1025 <directive name="scgi_pass"> | |
1026 <syntax><value>address</value></syntax> | |
1027 <default/> | |
1028 <context>location</context> | |
1029 <context>if in location</context> | |
1030 | |
1031 <para> | |
1032 Sets the address of an SCGI server. | |
1033 The address can be specified as a domain name or IP address, | |
1620
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1034 and a port: |
1180 | 1035 <example> |
1036 scgi_pass localhost:9000; | |
1037 </example> | |
1038 or as a UNIX-domain socket path: | |
1039 <example> | |
1040 scgi_pass unix:/tmp/scgi.socket; | |
1041 </example> | |
1042 </para> | |
1043 | |
1044 <para> | |
1045 If a domain name resolves to several addresses, all of them will be | |
1046 used in a round-robin fashion. | |
1047 In addition, an address can be specified as a | |
1048 <link doc="ngx_http_upstream_module.xml">server group</link>. | |
1049 </para> | |
1050 | |
1051 </directive> | |
1052 | |
1053 | |
1054 <directive name="scgi_pass_header"> | |
1055 <syntax><value>field</value></syntax> | |
1056 <default/> | |
1057 <context>http</context> | |
1058 <context>server</context> | |
1059 <context>location</context> | |
1060 | |
1061 <para> | |
1062 Permits passing <link id="scgi_hide_header">otherwise disabled</link> header | |
1063 fields from an SCGI server to a client. | |
1064 </para> | |
1065 | |
1066 </directive> | |
1067 | |
1068 | |
1069 <directive name="scgi_pass_request_body"> | |
1070 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
1071 <default>on</default> | |
1072 <context>http</context> | |
1073 <context>server</context> | |
1074 <context>location</context> | |
1075 | |
1076 <para> | |
1077 Indicates whether the original request body is passed | |
1078 to the SCGI server. | |
1079 See also the <link id="scgi_pass_request_headers"/> directive. | |
1080 </para> | |
1081 | |
1082 </directive> | |
1083 | |
1084 | |
1085 <directive name="scgi_pass_request_headers"> | |
1086 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
1087 <default>on</default> | |
1088 <context>http</context> | |
1089 <context>server</context> | |
1090 <context>location</context> | |
1091 | |
1092 <para> | |
1093 Indicates whether the header fields of the original request are passed | |
1094 to the SCGI server. | |
1095 See also the <link id="scgi_pass_request_body"/> directive. | |
1096 </para> | |
1097 | |
1098 </directive> | |
1099 | |
1100 | |
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1101 <directive name="scgi_read_timeout"> |
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1102 <syntax><value>time</value></syntax> |
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1103 <default>60s</default> |
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1104 <context>http</context> |
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1105 <context>server</context> |
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1106 <context>location</context> |
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|
1107 |
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1108 <para> |
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1109 Defines a timeout for reading a response from the SCGI server. |
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1110 The timeout is set only between two successive read operations, |
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1111 not for the transmission of the whole response. |
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1112 If the SCGI server does not transmit anything within this time, |
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1113 the connection is closed. |
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1114 </para> |
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1115 |
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1116 </directive> |
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1117 |
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1118 |
1437
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1119 <directive name="scgi_request_buffering"> |
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1120 <syntax><value>on</value> | <value>off</value></syntax> |
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1121 <default>on</default> |
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1122 <context>http</context> |
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1123 <context>server</context> |
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1124 <context>location</context> |
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1125 <appeared-in>1.7.11</appeared-in> |
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1126 |
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1127 <para> |
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1128 Enables or disables buffering of a client request body. |
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1129 </para> |
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1130 |
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1131 <para> |
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1132 When buffering is enabled, the entire request body is |
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1133 <link doc="ngx_http_core_module.xml" id="client_body_buffer_size">read</link> |
1440
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1134 from the client before sending the request to an SCGI server. |
1437
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1135 </para> |
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1136 |
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1137 <para> |
1440
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1138 When buffering is disabled, the request body is sent to the SCGI server |
1437
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1139 immediately as it is received. |
1440
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1140 In this case, the request cannot be passed to the |
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1141 <link id="scgi_next_upstream">next server</link> |
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1142 if nginx already started sending the request body. |
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1143 </para> |
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1144 |
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1145 <para> |
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1146 When HTTP/1.1 chunked transfer encoding is used |
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1147 to send the original request body, |
1443
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1148 the request body will be buffered regardless of the directive value. |
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1149 </para> |
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|
1150 |
8e7995bb8c6b
Documented proxy_request_buffering and friends.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1384
diff
changeset
|
1151 </directive> |
8e7995bb8c6b
Documented proxy_request_buffering and friends.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1384
diff
changeset
|
1152 |
8e7995bb8c6b
Documented proxy_request_buffering and friends.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1384
diff
changeset
|
1153 |
1180 | 1154 <directive name="scgi_send_timeout"> |
1155 <syntax><value>time</value></syntax> | |
1156 <default>60s</default> | |
1157 <context>http</context> | |
1158 <context>server</context> | |
1159 <context>location</context> | |
1160 | |
1161 <para> | |
1162 Sets a timeout for transmitting a request to the SCGI server. | |
1163 The timeout is set only between two successive write operations, | |
1164 not for the transmission of the whole request. | |
1165 If the SCGI server does not receive anything within this time, | |
1166 the connection is closed. | |
1167 </para> | |
1168 | |
1169 </directive> | |
1170 | |
1171 | |
1172 <directive name="scgi_store"> | |
1173 <syntax> | |
1174 <literal>on</literal> | | |
1175 <literal>off</literal> | | |
1176 <value>string</value></syntax> | |
1177 <default>off</default> | |
1178 <context>http</context> | |
1179 <context>server</context> | |
1180 <context>location</context> | |
1181 | |
1182 <para> | |
1183 Enables saving of files to a disk. | |
1184 The <literal>on</literal> parameter saves files with paths | |
1185 corresponding to the directives | |
1186 <link doc="ngx_http_core_module.xml" id="alias"/> or | |
1187 <link doc="ngx_http_core_module.xml" id="root"/>. | |
1188 The <literal>off</literal> parameter disables saving of files. | |
1189 In addition, the file name can be set explicitly using the | |
1190 <value>string</value> with variables: | |
1191 <example> | |
1192 scgi_store /data/www$original_uri; | |
1193 </example> | |
1194 </para> | |
1195 | |
1196 <para> | |
1197 The modification time of files is set according to the received | |
1198 <header>Last-Modified</header> response header field. | |
1199 The response is first written to a temporary file, | |
1200 and then the file is renamed. | |
1201 Starting from version 0.8.9, temporary files and the persistent store | |
1202 can be put on different file systems. | |
1203 However, be aware that in this case a file is copied | |
1204 across two file systems instead of the cheap renaming operation. | |
1205 It is thus recommended that for any given location both saved files and a | |
1206 directory holding temporary files, set by the <link id="scgi_temp_path"/> | |
1207 directive, are put on the same file system. | |
1208 </para> | |
1209 | |
1210 <para> | |
1211 This directive can be used to create local copies of static unchangeable | |
1212 files, e.g.: | |
1213 <example> | |
1214 location /images/ { | |
1184
55857cbf562d
Fixed alignment issues after mechanical conversion from fastcgi.
Ruslan Ermilov <ru@nginx.com>
parents:
1182
diff
changeset
|
1215 root /data/www; |
55857cbf562d
Fixed alignment issues after mechanical conversion from fastcgi.
Ruslan Ermilov <ru@nginx.com>
parents:
1182
diff
changeset
|
1216 error_page 404 = /fetch$uri; |
1180 | 1217 } |
1218 | |
1219 location /fetch/ { | |
1220 internal; | |
1221 | |
1222 scgi_pass backend:9000; | |
1223 ... | |
1224 | |
1225 scgi_store on; | |
1226 scgi_store_access user:rw group:rw all:r; | |
1227 scgi_temp_path /data/temp; | |
1228 | |
1184
55857cbf562d
Fixed alignment issues after mechanical conversion from fastcgi.
Ruslan Ermilov <ru@nginx.com>
parents:
1182
diff
changeset
|
1229 alias /data/www/; |
1180 | 1230 } |
1231 </example> | |
1232 </para> | |
1233 | |
1234 </directive> | |
1235 | |
1236 | |
1237 <directive name="scgi_store_access"> | |
1238 <syntax><value>users</value>:<value>permissions</value> ...</syntax> | |
1239 <default>user:rw</default> | |
1240 <context>http</context> | |
1241 <context>server</context> | |
1242 <context>location</context> | |
1243 | |
1244 <para> | |
1245 Sets access permissions for newly created files and directories, e.g.: | |
1246 <example> | |
1247 scgi_store_access user:rw group:rw all:r; | |
1248 </example> | |
1249 </para> | |
1250 | |
1251 <para> | |
1252 If any <literal>group</literal> or <literal>all</literal> access permissions | |
1253 are specified then <literal>user</literal> permissions may be omitted: | |
1254 <example> | |
1255 scgi_store_access group:rw all:r; | |
1256 </example> | |
1257 </para> | |
1258 | |
1259 </directive> | |
1260 | |
1261 | |
1262 <directive name="scgi_temp_file_write_size"> | |
1263 <syntax><value>size</value></syntax> | |
1264 <default>8k|16k</default> | |
1265 <context>http</context> | |
1266 <context>server</context> | |
1267 <context>location</context> | |
1268 | |
1269 <para> | |
1270 Limits the <value>size</value> of data written to a temporary file | |
1271 at a time, when buffering of responses from the SCGI server | |
1272 to temporary files is enabled. | |
1273 By default, <value>size</value> is limited by two buffers set by the | |
1274 <link id="scgi_buffer_size"/> and <link id="scgi_buffers"/> directives. | |
1275 The maximum size of a temporary file is set by the | |
1276 <link id="scgi_max_temp_file_size"/> directive. | |
1277 </para> | |
1278 | |
1279 </directive> | |
1280 | |
1281 | |
1282 <directive name="scgi_temp_path"> | |
1283 <syntax> | |
1284 <value>path</value> | |
1285 [<value>level1</value> | |
1286 [<value>level2</value> | |
1287 [<value>level3</value>]]]</syntax> | |
1288 <default>scgi_temp</default> | |
1289 <context>http</context> | |
1290 <context>server</context> | |
1291 <context>location</context> | |
1292 | |
1293 <para> | |
1294 Defines a directory for storing temporary files | |
1295 with data received from SCGI servers. | |
1296 Up to three-level subdirectory hierarchy can be used underneath the specified | |
1297 directory. | |
1298 For example, in the following configuration | |
1299 <example> | |
1300 scgi_temp_path /spool/nginx/scgi_temp 1 2; | |
1301 </example> | |
1302 a temporary file might look like this: | |
1303 <example> | |
1304 /spool/nginx/scgi_temp/<emphasis>7</emphasis>/<emphasis>45</emphasis>/00000123<emphasis>457</emphasis> | |
1305 </example> | |
1306 </para> | |
1307 | |
1384
66ee77849563
Documented the use_temp_path parameter of the proxy_cache_path directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1382
diff
changeset
|
1308 <para> |
66ee77849563
Documented the use_temp_path parameter of the proxy_cache_path directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1382
diff
changeset
|
1309 See also the <literal>use_temp_path</literal> parameter of the |
66ee77849563
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Yaroslav Zhuravlev <yar@nginx.com>
parents:
1382
diff
changeset
|
1310 <link id="scgi_cache_path"/> directive. |
66ee77849563
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Yaroslav Zhuravlev <yar@nginx.com>
parents:
1382
diff
changeset
|
1311 </para> |
66ee77849563
Documented the use_temp_path parameter of the proxy_cache_path directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
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diff
changeset
|
1312 |
1180 | 1313 </directive> |
1314 | |
1315 </section> | |
1316 | |
1317 </module> |