Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_scgi_module.xml @ 1353:25db29c8875e
Documented how the "Vary" response header field affects caching.
| author | Ruslan Ermilov <ru@nginx.com> |
|---|---|
| date | Fri, 14 Nov 2014 10:40:00 +0300 |
| parents | dbb618f60a54 |
| children | 91f5c089f4ca |
| rev | line source |
|---|---|
| 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="12"> |
| 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. | |
| 72 By default, the buffer size is equal to the size of one | |
| 73 buffer set by the <link id="scgi_buffers"/> directive. | |
| 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. | |
| 170 The <literal>off</literal> parameter disables caching inherited | |
| 171 from the previous configuration level. | |
| 172 </para> | |
| 173 | |
| 174 </directive> | |
| 175 | |
| 176 | |
| 177 <directive name="scgi_cache_bypass"> | |
| 178 <syntax><value>string</value> ...</syntax> | |
| 179 <default/> | |
| 180 <context>http</context> | |
| 181 <context>server</context> | |
| 182 <context>location</context> | |
| 183 | |
| 184 <para> | |
| 185 Defines conditions under which the response will not be taken from a cache. | |
| 186 If at least one value of the string parameters is not empty and is not | |
| 187 equal to “0” then the response will not be taken from the cache: | |
| 188 <example> | |
| 189 scgi_cache_bypass $cookie_nocache $arg_nocache$arg_comment; | |
| 190 scgi_cache_bypass $http_pragma $http_authorization; | |
| 191 </example> | |
| 192 Can be used along with the <link id="scgi_no_cache"/> directive. | |
| 193 </para> | |
| 194 | |
| 195 </directive> | |
| 196 | |
| 197 | |
| 198 <directive name="scgi_cache_key"> | |
| 199 <syntax><value>string</value></syntax> | |
| 200 <default/> | |
| 201 <context>http</context> | |
| 202 <context>server</context> | |
| 203 <context>location</context> | |
| 204 | |
| 205 <para> | |
| 206 Defines a key for caching, for example | |
| 207 <example> | |
| 208 scgi_cache_key localhost:9000$request_uri; | |
| 209 </example> | |
| 210 </para> | |
| 211 | |
| 212 </directive> | |
| 213 | |
| 214 | |
| 215 <directive name="scgi_cache_lock"> | |
| 216 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 217 <default>off</default> | |
| 218 <context>http</context> | |
| 219 <context>server</context> | |
| 220 <context>location</context> | |
| 221 <appeared-in>1.1.12</appeared-in> | |
| 222 | |
| 223 <para> | |
| 224 When enabled, only one request at a time will be allowed to populate | |
| 225 a new cache element identified according to the <link id="scgi_cache_key"/> | |
| 226 directive by passing a request to an SCGI server. | |
| 227 Other requests of the same cache element will either wait | |
| 228 for a response to appear in the cache or the cache lock for | |
| 229 this element to be released, up to the time set by the | |
| 230 <link id="scgi_cache_lock_timeout"/> directive. | |
| 231 </para> | |
| 232 | |
| 233 </directive> | |
| 234 | |
| 235 | |
| 236 <directive name="scgi_cache_lock_timeout"> | |
| 237 <syntax><value>time</value></syntax> | |
| 238 <default>5s</default> | |
| 239 <context>http</context> | |
| 240 <context>server</context> | |
| 241 <context>location</context> | |
| 242 <appeared-in>1.1.12</appeared-in> | |
| 243 | |
| 244 <para> | |
| 245 Sets a timeout for <link id="scgi_cache_lock"/>. | |
| 246 </para> | |
| 247 | |
| 248 </directive> | |
| 249 | |
| 250 | |
| 251 <directive name="scgi_cache_methods"> | |
| 252 <syntax> | |
| 253 <literal>GET</literal> | | |
| 254 <literal>HEAD</literal> | | |
| 255 <literal>POST</literal> | |
| 256 ...</syntax> | |
| 257 <default>GET HEAD</default> | |
| 258 <context>http</context> | |
| 259 <context>server</context> | |
| 260 <context>location</context> | |
| 261 | |
| 262 <para> | |
| 263 If the client request method is listed in this directive then | |
| 264 the response will be cached. | |
| 265 “<literal>GET</literal>” and “<literal>HEAD</literal>” methods are always | |
| 266 added to the list, though it is recommended to specify them explicitly. | |
| 267 See also the <link id="scgi_no_cache"/> directive. | |
| 268 </para> | |
| 269 | |
| 270 </directive> | |
| 271 | |
| 272 | |
| 273 <directive name="scgi_cache_min_uses"> | |
| 274 <syntax><value>number</value></syntax> | |
| 275 <default>1</default> | |
| 276 <context>http</context> | |
| 277 <context>server</context> | |
| 278 <context>location</context> | |
| 279 | |
| 280 <para> | |
| 281 Sets the <value>number</value> of requests after which the response | |
| 282 will be cached. | |
| 283 </para> | |
| 284 | |
| 285 </directive> | |
| 286 | |
| 287 | |
| 288 <directive name="scgi_cache_path"> | |
| 289 <syntax> | |
| 290 <value>path</value> | |
| 291 [<literal>levels</literal>=<value>levels</value>] | |
| 292 <literal>keys_zone</literal>=<value>name</value>:<value>size</value> | |
| 293 [<literal>inactive</literal>=<value>time</value>] | |
| 294 [<literal>max_size</literal>=<value>size</value>] | |
| 295 [<literal>loader_files</literal>=<value>number</value>] | |
| 296 [<literal>loader_sleep</literal>=<value>time</value>] | |
| 297 [<literal>loader_threshold</literal>=<value>time</value>]</syntax> | |
| 298 <default/> | |
| 299 <context>http</context> | |
| 300 | |
| 301 <para> | |
| 302 Sets the path and other parameters of a cache. | |
| 303 Cache data are stored in files. | |
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304 The file name in a cache is a result of |
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305 applying the MD5 function to the |
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306 <link id="scgi_cache_key">cache key</link>. |
| 1180 | 307 The <literal>levels</literal> parameter defines hierarchy levels of a cache. |
| 308 For example, in the following configuration | |
| 309 <example> | |
| 310 scgi_cache_path /data/nginx/cache levels=1:2 keys_zone=one:10m; | |
| 311 </example> | |
| 312 file names in a cache will look like this: | |
| 313 <example> | |
| 314 /data/nginx/cache/<emphasis>c</emphasis>/<emphasis>29</emphasis>/b7f54b2df7773722d382f4809d650<emphasis>29c</emphasis> | |
| 315 </example> | |
| 316 </para> | |
| 317 | |
| 318 <para> | |
| 319 A cached response is first written to a temporary file, | |
| 320 and then the file is renamed. | |
| 321 Starting from version 0.8.9, temporary files and the cache can be put on | |
| 322 different file systems. | |
| 323 However, be aware that in this case a file is copied | |
| 324 across two file systems instead of the cheap renaming operation. | |
| 325 It is thus recommended that for any given location both cache and a directory | |
| 326 holding temporary files, set by the <link id="scgi_temp_path"/> directive, | |
| 327 are put on the same file system. | |
| 328 </para> | |
| 329 | |
| 330 <para> | |
| 331 In addition, all active keys and information about data are stored | |
| 332 in a shared memory zone, whose <value>name</value> and <value>size</value> | |
| 333 are configured by the <literal>keys_zone</literal> parameter. | |
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334 One megabyte zone can store about 8 thousand keys. |
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335 </para> |
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336 |
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337 <para> |
| 1180 | 338 Cached data that are not accessed during the time specified by the |
| 339 <literal>inactive</literal> parameter get removed from the cache | |
| 340 regardless of their freshness. | |
| 341 By default, <literal>inactive</literal> is set to 10 minutes. | |
| 342 </para> | |
| 343 | |
| 344 <para> | |
| 345 The special “cache manager” process monitors the maximum cache size set | |
| 346 by the <literal>max_size</literal> parameter. | |
| 347 When this size is exceeded, it removes the least recently used data. | |
| 348 </para> | |
| 349 | |
| 350 <para> | |
| 351 A minute after the start the special “cache loader” process is activated. | |
| 352 It loads information about previously cached data stored on file system | |
| 353 into a cache zone. | |
| 354 The loading is done in iterations. | |
| 355 During one iteration no more than <literal>loader_files</literal> items | |
| 356 are loaded (by default, 100). | |
| 357 Besides, the duration of one iteration is limited by the | |
| 358 <literal>loader_threshold</literal> parameter (by default, 200 milliseconds). | |
| 359 Between iterations, a pause configured by the <literal>loader_sleep</literal> | |
| 360 parameter (by default, 50 milliseconds) is made. | |
| 361 </para> | |
| 362 | |
| 363 </directive> | |
| 364 | |
| 365 | |
| 366 <directive name="scgi_cache_purge"> | |
| 367 <syntax>string ...</syntax> | |
| 368 <default/> | |
| 369 <context>http</context> | |
| 370 <context>server</context> | |
| 371 <context>location</context> | |
| 372 <appeared-in>1.5.7</appeared-in> | |
| 373 | |
| 374 <para> | |
| 375 Defines conditions under which the request will be considered a cache | |
| 376 purge request. | |
| 377 If at least one value of the string parameters is not empty and is not equal | |
| 378 to “0” then the cache entry with a corresponding | |
| 379 <link id="scgi_cache_key">cache key</link> is removed. | |
| 380 The result of successful operation is indicated by returning | |
| 381 the <http-status code="204" text="No Content"/> response. | |
| 382 </para> | |
| 383 | |
| 384 <para> | |
| 385 If the <link id="scgi_cache_key">cache key</link> of a purge request ends | |
| 386 with an asterisk (“<literal>*</literal>”), all cache entries matching the | |
| 387 wildcard key will be removed from the cache. | |
| 388 </para> | |
| 389 | |
| 390 <para> | |
| 391 Example configuration: | |
| 392 <example> | |
| 393 scgi_cache_path /data/nginx/cache keys_zone=cache_zone:10m; | |
| 394 | |
| 395 map $request_method $purge_method { | |
| 396 PURGE 1; | |
| 397 default 0; | |
| 398 } | |
| 399 | |
| 400 server { | |
| 401 ... | |
| 402 location / { | |
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403 scgi_pass backend; |
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404 scgi_cache cache_zone; |
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405 scgi_cache_key $uri; |
| 1180 | 406 scgi_cache_purge $purge_method; |
| 407 } | |
| 408 } | |
| 409 </example> | |
| 410 <note> | |
| 411 This functionality is available as part of our | |
| 412 <commercial_version>commercial subscription</commercial_version>. | |
| 413 </note> | |
| 414 </para> | |
| 415 | |
| 416 </directive> | |
| 417 | |
| 418 | |
| 419 <directive name="scgi_cache_revalidate"> | |
| 420 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 421 <default>off</default> | |
| 422 <context>http</context> | |
| 423 <context>server</context> | |
| 424 <context>location</context> | |
| 425 <appeared-in>1.5.7</appeared-in> | |
| 426 | |
| 427 <para> | |
| 428 Enables revalidation of expired cache items using conditional requests with | |
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429 the <header>If-Modified-Since</header> and <header>If-None-Match</header> |
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430 header fields. |
| 1180 | 431 </para> |
| 432 | |
| 433 </directive> | |
| 434 | |
| 435 | |
| 436 <directive name="scgi_cache_use_stale"> | |
| 437 <syntax> | |
| 438 <literal>error</literal> | | |
| 439 <literal>timeout</literal> | | |
| 440 <literal>invalid_header</literal> | | |
| 441 <literal>updating</literal> | | |
| 442 <literal>http_500</literal> | | |
| 443 <literal>http_503</literal> | | |
| 444 <literal>http_403</literal> | | |
| 445 <literal>http_404</literal> | | |
| 446 <literal>off</literal> | |
| 447 ...</syntax> | |
| 448 <default>off</default> | |
| 449 <context>http</context> | |
| 450 <context>server</context> | |
| 451 <context>location</context> | |
| 452 | |
| 453 <para> | |
| 454 Determines in which cases a stale cached response can be used | |
| 455 when an error occurs during communication with the SCGI server. | |
| 456 The directive’s parameters match the parameters of the | |
| 457 <link id="scgi_next_upstream"/> directive. | |
| 458 </para> | |
| 459 | |
| 460 <para> | |
| 461 Additionally, the <literal>updating</literal> parameter permits | |
| 462 using a stale cached response if it is currently being updated. | |
| 463 This allows minimizing the number of accesses to SCGI servers | |
| 464 when updating cached data. | |
| 465 </para> | |
| 466 | |
| 467 <para> | |
| 468 To minimize the number of accesses to SCGI servers when | |
| 469 populating a new cache element, the <link id="scgi_cache_lock"/> | |
| 470 directive can be used. | |
| 471 </para> | |
| 472 | |
| 473 </directive> | |
| 474 | |
| 475 | |
| 476 <directive name="scgi_cache_valid"> | |
| 477 <syntax>[<value>code</value> ...] <value>time</value></syntax> | |
| 478 <default/> | |
| 479 <context>http</context> | |
| 480 <context>server</context> | |
| 481 <context>location</context> | |
| 482 | |
| 483 <para> | |
| 484 Sets caching time for different response codes. | |
| 485 For example, the following directives | |
| 486 <example> | |
| 487 scgi_cache_valid 200 302 10m; | |
| 488 scgi_cache_valid 404 1m; | |
| 489 </example> | |
| 490 set 10 minutes of caching for responses with codes 200 and 302 | |
| 491 and 1 minute for responses with code 404. | |
| 492 </para> | |
| 493 | |
| 494 <para> | |
| 495 If only caching <value>time</value> is specified | |
| 496 <example> | |
| 497 scgi_cache_valid 5m; | |
| 498 </example> | |
| 499 then only 200, 301, and 302 responses are cached. | |
| 500 </para> | |
| 501 | |
| 502 <para> | |
| 503 In addition, the <literal>any</literal> parameter can be specified | |
| 504 to cache any responses: | |
| 505 <example> | |
| 506 scgi_cache_valid 200 302 10m; | |
| 507 scgi_cache_valid 301 1h; | |
| 508 scgi_cache_valid any 1m; | |
| 509 </example> | |
| 510 </para> | |
| 511 | |
| 512 <para> | |
| 513 Parameters of caching can also be set directly | |
| 514 in the response header. | |
| 515 This has higher priority than setting of caching time using the directive. | |
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516 <list type="bullet" compact="no"> |
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517 |
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518 <listitem> |
| 1180 | 519 The <header>X-Accel-Expires</header> header field sets caching time of a |
| 520 response in seconds. | |
| 521 The zero value disables caching for a response. | |
| 522 If the value starts with the <literal>@</literal> prefix, it sets an absolute | |
| 523 time in seconds since Epoch, up to which the response may be cached. | |
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524 </listitem> |
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525 |
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526 <listitem> |
| 1180 | 527 If the header does not include the <header>X-Accel-Expires</header> field, |
| 528 parameters of caching may be set in the header fields | |
| 529 <header>Expires</header> or <header>Cache-Control</header>. | |
|
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530 </listitem> |
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531 |
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532 <listitem> |
| 1180 | 533 If the header includes the <header>Set-Cookie</header> field, such a |
| 534 response will not be cached. | |
|
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535 </listitem> |
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536 |
|
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537 <listitem> |
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538 If the header includes the <header>Vary</header> field |
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539 with the special value “<literal>*</literal>”, such a |
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540 response will not be cached (1.7.7). |
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541 If the header includes the <header>Vary</header> field |
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542 with another value, such a response will be cached |
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543 taking into account the corresponding request header fields (1.7.7). |
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544 </listitem> |
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545 |
|
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546 </list> |
| 1180 | 547 Processing of one or more of these response header fields can be disabled |
| 548 using the <link id="scgi_ignore_headers"/> directive. | |
| 549 </para> | |
| 550 | |
| 551 </directive> | |
| 552 | |
| 553 | |
| 554 <directive name="scgi_connect_timeout"> | |
| 555 <syntax><value>time</value></syntax> | |
| 556 <default>60s</default> | |
| 557 <context>http</context> | |
| 558 <context>server</context> | |
| 559 <context>location</context> | |
| 560 | |
| 561 <para> | |
| 562 Defines a timeout for establishing a connection with an SCGI server. | |
| 563 It should be noted that this timeout cannot usually exceed 75 seconds. | |
| 564 </para> | |
| 565 | |
| 566 </directive> | |
| 567 | |
| 568 | |
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569 <directive name="scgi_force_ranges"> |
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570 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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571 <default>off</default> |
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572 <context>http</context> |
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573 <context>server</context> |
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574 <context>location</context> |
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575 <appeared-in>1.7.7</appeared-in> |
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576 |
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577 <para> |
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578 Enables byte-range support |
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579 for both cached and uncached responses from the SCGI server |
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580 regardless of the <header>Accept-Ranges</header> field in these responses. |
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581 </para> |
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582 |
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583 </directive> |
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584 |
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585 |
| 1180 | 586 <directive name="scgi_hide_header"> |
| 587 <syntax><value>field</value></syntax> | |
| 588 <default/> | |
| 589 <context>http</context> | |
| 590 <context>server</context> | |
| 591 <context>location</context> | |
| 592 | |
| 593 <para> | |
| 594 By default, | |
| 595 nginx does not pass the header fields <header>Status</header> and | |
| 596 <header>X-Accel-...</header> from the response of an SCGI | |
| 597 server to a client. | |
| 598 The <literal>scgi_hide_header</literal> directive sets additional fields | |
| 599 that will not be passed. | |
| 600 If, on the contrary, the passing of fields needs to be permitted, | |
| 601 the <link id="scgi_pass_header"/> directive can be used. | |
| 602 </para> | |
| 603 | |
| 604 </directive> | |
| 605 | |
| 606 | |
| 607 <directive name="scgi_ignore_client_abort"> | |
| 608 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 609 <default>off</default> | |
| 610 <context>http</context> | |
| 611 <context>server</context> | |
| 612 <context>location</context> | |
| 613 | |
| 614 <para> | |
| 615 Determines whether the connection with an SCGI server should be | |
| 616 closed when a client closes the connection without waiting | |
| 617 for a response. | |
| 618 </para> | |
| 619 | |
| 620 </directive> | |
| 621 | |
| 622 | |
| 623 <directive name="scgi_ignore_headers"> | |
| 624 <syntax><value>field</value> ...</syntax> | |
| 625 <default/> | |
| 626 <context>http</context> | |
| 627 <context>server</context> | |
| 628 <context>location</context> | |
| 629 | |
| 630 <para> | |
| 631 Disables processing of certain response header fields from the SCGI server. | |
| 632 The following fields can be ignored: <header>X-Accel-Redirect</header>, | |
| 633 <header>X-Accel-Expires</header>, <header>X-Accel-Limit-Rate</header> (1.1.6), | |
| 634 <header>X-Accel-Buffering</header> (1.1.6), | |
| 635 <header>X-Accel-Charset</header> (1.1.6), <header>Expires</header>, | |
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636 <header>Cache-Control</header>, <header>Set-Cookie</header> (0.8.44), |
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637 and <header>Vary</header> (1.7.7). |
| 1180 | 638 </para> |
| 639 | |
| 640 <para> | |
| 641 If not disabled, processing of these header fields has the following | |
| 642 effect: | |
| 643 <list type="bullet" compact="no"> | |
| 644 | |
| 645 <listitem> | |
| 646 <header>X-Accel-Expires</header>, <header>Expires</header>, | |
|
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647 <header>Cache-Control</header>, <header>Set-Cookie</header>, |
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648 and <header>Vary</header> |
| 1180 | 649 set the parameters of response <link id="scgi_cache_valid">caching</link>; |
| 650 </listitem> | |
| 651 | |
| 652 <listitem> | |
| 653 <header>X-Accel-Redirect</header> performs an | |
| 654 <link doc="ngx_http_core_module.xml" id="internal">internal | |
| 655 redirect</link> to the specified URI; | |
| 656 </listitem> | |
| 657 | |
| 658 <listitem> | |
| 659 <header>X-Accel-Limit-Rate</header> sets the | |
| 660 <link doc="ngx_http_core_module.xml" id="limit_rate">rate | |
| 661 limit</link> for transmission of a response to a client; | |
| 662 </listitem> | |
| 663 | |
| 664 <listitem> | |
| 665 <header>X-Accel-Buffering</header> enables or disables | |
| 666 <link id="scgi_buffering">buffering</link> of a response; | |
| 667 </listitem> | |
| 668 | |
| 669 <listitem> | |
| 670 <header>X-Accel-Charset</header> sets the desired | |
| 671 <link doc="ngx_http_charset_module.xml" id="charset"/> | |
| 672 of a response. | |
| 673 </listitem> | |
| 674 | |
| 675 </list> | |
| 676 </para> | |
| 677 | |
| 678 </directive> | |
| 679 | |
| 680 | |
| 681 <directive name="scgi_intercept_errors"> | |
| 682 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 683 <default>off</default> | |
| 684 <context>http</context> | |
| 685 <context>server</context> | |
| 686 <context>location</context> | |
| 687 | |
| 688 <para> | |
| 689 Determines whether an SCGI server responses with codes greater than or equal | |
| 690 to 300 should be passed to a client or be redirected to nginx for processing | |
| 691 with the <link doc="ngx_http_core_module.xml" id="error_page"/> directive. | |
| 692 </para> | |
| 693 | |
| 694 </directive> | |
| 695 | |
| 696 | |
|
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697 <directive name="scgi_limit_rate"> |
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698 <syntax><value>rate</value></syntax> |
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699 <default>0</default> |
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700 <context>http</context> |
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701 <context>server</context> |
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702 <context>location</context> |
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703 <appeared-in>1.7.7</appeared-in> |
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704 |
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705 <para> |
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706 Limits the speed of reading the response from the SCGI server. |
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707 The <value>rate</value> is specified in bytes per second. |
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708 The zero value disables rate limiting. |
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709 The limit is set per a request, and so if nginx simultaneously opens |
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710 two connections to the SCGI server, |
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711 the overall rate will be twice as much as the specified limit. |
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712 The limitation works only if |
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713 <link id="scgi_buffering">buffering</link> of responses from the SCGI |
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714 server is enabled. |
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715 </para> |
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716 |
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717 </directive> |
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718 |
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719 |
| 1180 | 720 <directive name="scgi_max_temp_file_size"> |
| 721 <syntax><value>size</value></syntax> | |
| 722 <default>1024m</default> | |
| 723 <context>http</context> | |
| 724 <context>server</context> | |
| 725 <context>location</context> | |
| 726 | |
| 727 <para> | |
| 728 When <link id="scgi_buffering">buffering</link> of responses from the SCGI | |
| 729 server is enabled, and the whole response does not fit into the buffers | |
| 730 set by the <link id="scgi_buffer_size"/> and <link id="scgi_buffers"/> | |
| 731 directives, a part of the response can be saved to a temporary file. | |
| 732 This directive sets the maximum <value>size</value> of the temporary file. | |
| 733 The size of data written to the temporary file at a time is set | |
| 734 by the <link id="scgi_temp_file_write_size"/> directive. | |
| 735 </para> | |
| 736 | |
| 737 <para> | |
| 738 The zero value disables buffering of responses to temporary files. | |
| 739 </para> | |
| 740 | |
|
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741 <para> |
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742 <note> |
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743 This restriction does not apply to responses |
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744 that will be <link id="scgi_cache">cached</link> |
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745 or <link id="scgi_store">stored</link> on disk. |
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746 </note> |
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747 </para> |
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748 |
| 1180 | 749 </directive> |
| 750 | |
| 751 | |
| 752 <directive name="scgi_next_upstream"> | |
| 753 <syntax> | |
| 754 <literal>error</literal> | | |
| 755 <literal>timeout</literal> | | |
| 756 <literal>invalid_header</literal> | | |
| 757 <literal>http_500</literal> | | |
| 758 <literal>http_503</literal> | | |
| 759 <literal>http_403</literal> | | |
| 760 <literal>http_404</literal> | | |
| 761 <literal>off</literal> | |
| 762 ...</syntax> | |
| 763 <default>error timeout</default> | |
| 764 <context>http</context> | |
| 765 <context>server</context> | |
| 766 <context>location</context> | |
| 767 | |
| 768 <para> | |
| 769 Specifies in which cases a request should be passed to the next server: | |
| 770 <list type="tag"> | |
| 771 | |
| 772 <tag-name><literal>error</literal></tag-name> | |
| 773 <tag-desc>an error occurred while establishing a connection with the | |
| 774 server, passing a request to it, or reading the response header;</tag-desc> | |
| 775 | |
| 776 <tag-name><literal>timeout</literal></tag-name> | |
| 777 <tag-desc>a timeout has occurred while establishing a connection with the | |
| 778 server, passing a request to it, or reading the response header;</tag-desc> | |
| 779 | |
| 780 <tag-name><literal>invalid_header</literal></tag-name> | |
| 781 <tag-desc>a server returned an empty or invalid response;</tag-desc> | |
| 782 | |
| 783 <tag-name><literal>http_500</literal></tag-name> | |
| 784 <tag-desc>a server returned a response with the code 500;</tag-desc> | |
| 785 | |
| 786 <tag-name><literal>http_503</literal></tag-name> | |
| 787 <tag-desc>a server returned a response with the code 503;</tag-desc> | |
| 788 | |
| 789 <tag-name><literal>http_403</literal></tag-name> | |
| 790 <tag-desc>a server returned a response with the code 403;</tag-desc> | |
| 791 | |
| 792 <tag-name><literal>http_404</literal></tag-name> | |
| 793 <tag-desc>a server returned a response with the code 404;</tag-desc> | |
| 794 | |
| 795 <tag-name><literal>off</literal></tag-name> | |
| 796 <tag-desc>disables passing a request to the next server.</tag-desc> | |
| 797 | |
| 798 </list> | |
| 799 </para> | |
| 800 | |
| 801 <para> | |
| 802 One should bear in mind that passing a request to the next server is | |
| 803 only possible if nothing has been sent to a client yet. | |
| 804 That is, if an error or timeout occurs in the middle of the | |
| 805 transferring of a response, fixing this is impossible. | |
| 806 </para> | |
| 807 | |
| 808 <para> | |
|
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809 The directive also defines what is considered an |
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810 <link doc="ngx_http_upstream_module.xml" id="max_fails">unsuccessful |
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811 attempt</link> of communication with a server. |
| 1180 | 812 The cases of <literal>error</literal>, <literal>timeout</literal> and |
| 813 <literal>invalid_header</literal> are always considered unsuccessful attempts, | |
| 814 even if they are not specified in the directive. | |
| 815 The cases of <literal>http_500</literal> and <literal>http_503</literal> are | |
| 816 considered unsuccessful attempts only if they are specified in the directive. | |
| 817 The cases of <literal>http_403</literal> and <literal>http_404</literal> | |
| 818 are never considered unsuccessful attempts. | |
| 819 </para> | |
| 820 | |
|
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821 <para> |
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822 Passing a request to the next server can be limited by |
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823 <link id="scgi_next_upstream_tries">the number of tries</link> |
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824 and by <link id="scgi_next_upstream_timeout">time</link>. |
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825 </para> |
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826 |
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827 </directive> |
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828 |
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829 |
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830 <directive name="scgi_next_upstream_timeout"> |
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831 <syntax><value>time</value></syntax> |
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832 <default>0</default> |
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833 <context>http</context> |
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834 <context>server</context> |
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835 <context>location</context> |
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836 <appeared-in>1.7.5</appeared-in> |
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837 |
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838 <para> |
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839 Limits the time allowed to pass a request to the |
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840 <link id="scgi_next_upstream">next server</link>. |
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841 The <literal>0</literal> value turns off this limitation. |
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842 </para> |
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843 |
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844 </directive> |
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845 |
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846 |
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847 <directive name="scgi_next_upstream_tries"> |
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848 <syntax><value>number</value></syntax> |
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849 <default>0</default> |
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850 <context>http</context> |
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851 <context>server</context> |
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852 <context>location</context> |
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853 <appeared-in>1.7.5</appeared-in> |
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854 |
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855 <para> |
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856 Limits the number of possible tries for passing a request to the |
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857 <link id="scgi_next_upstream">next server</link>. |
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858 The <literal>0</literal> value turns off this limitation. |
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859 </para> |
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860 |
| 1180 | 861 </directive> |
| 862 | |
| 863 | |
| 864 <directive name="scgi_no_cache"> | |
| 865 <syntax><value>string</value> ...</syntax> | |
| 866 <default/> | |
| 867 <context>http</context> | |
| 868 <context>server</context> | |
| 869 <context>location</context> | |
| 870 | |
| 871 <para> | |
| 872 Defines conditions under which the response will not be saved to a cache. | |
| 873 If at least one value of the string parameters is not empty and is not | |
| 874 equal to “0” then the response will not be saved: | |
| 875 <example> | |
| 876 scgi_no_cache $cookie_nocache $arg_nocache$arg_comment; | |
| 877 scgi_no_cache $http_pragma $http_authorization; | |
| 878 </example> | |
| 879 Can be used along with the <link id="scgi_cache_bypass"/> directive. | |
| 880 </para> | |
| 881 | |
| 882 </directive> | |
| 883 | |
| 884 | |
| 885 <directive name="scgi_param"> | |
| 886 <syntax> | |
| 887 <value>parameter</value> <value>value</value> | |
| 888 [<literal>if_not_empty</literal>]</syntax> | |
| 889 <default/> | |
| 890 <context>http</context> | |
| 891 <context>server</context> | |
| 892 <context>location</context> | |
| 893 | |
| 894 <para> | |
| 895 Sets a <value>parameter</value> that should be passed to the SCGI server. | |
| 896 The <value>value</value> can contain text, variables, and their combination. | |
| 897 These directives are inherited from the previous level if and | |
| 898 only if there are no | |
| 899 <literal>scgi_param</literal> | |
| 900 directives defined on the current level. | |
| 901 </para> | |
| 902 | |
| 903 <para> | |
| 904 Standard | |
| 905 <link url="http://tools.ietf.org/html/rfc3875#section-4.1">CGI | |
| 906 environment variables</link> | |
| 907 should be provided as SCGI headers, see the <path>scgi_params</path> file | |
| 908 provided in the distribution: | |
| 909 <example> | |
| 910 location / { | |
| 911 include scgi_params; | |
| 912 ... | |
| 913 } | |
| 914 </example> | |
| 915 </para> | |
| 916 | |
|
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917 <para> |
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918 If a directive is specified with <literal>if_not_empty</literal> (1.1.11) then |
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919 such a parameter will not be passed to the server until its value is not empty: |
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920 <example> |
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921 scgi_param HTTPS $https if_not_empty; |
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922 </example> |
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923 </para> |
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924 |
| 1180 | 925 </directive> |
| 926 | |
| 927 | |
| 928 <directive name="scgi_pass"> | |
| 929 <syntax><value>address</value></syntax> | |
| 930 <default/> | |
| 931 <context>location</context> | |
| 932 <context>if in location</context> | |
| 933 | |
| 934 <para> | |
| 935 Sets the address of an SCGI server. | |
| 936 The address can be specified as a domain name or IP address, | |
| 937 and an optional port: | |
| 938 <example> | |
| 939 scgi_pass localhost:9000; | |
| 940 </example> | |
| 941 or as a UNIX-domain socket path: | |
| 942 <example> | |
| 943 scgi_pass unix:/tmp/scgi.socket; | |
| 944 </example> | |
| 945 </para> | |
| 946 | |
| 947 <para> | |
| 948 If a domain name resolves to several addresses, all of them will be | |
| 949 used in a round-robin fashion. | |
| 950 In addition, an address can be specified as a | |
| 951 <link doc="ngx_http_upstream_module.xml">server group</link>. | |
| 952 </para> | |
| 953 | |
| 954 </directive> | |
| 955 | |
| 956 | |
| 957 <directive name="scgi_pass_header"> | |
| 958 <syntax><value>field</value></syntax> | |
| 959 <default/> | |
| 960 <context>http</context> | |
| 961 <context>server</context> | |
| 962 <context>location</context> | |
| 963 | |
| 964 <para> | |
| 965 Permits passing <link id="scgi_hide_header">otherwise disabled</link> header | |
| 966 fields from an SCGI server to a client. | |
| 967 </para> | |
| 968 | |
| 969 </directive> | |
| 970 | |
| 971 | |
| 972 <directive name="scgi_read_timeout"> | |
| 973 <syntax><value>time</value></syntax> | |
| 974 <default>60s</default> | |
| 975 <context>http</context> | |
| 976 <context>server</context> | |
| 977 <context>location</context> | |
| 978 | |
| 979 <para> | |
| 980 Defines a timeout for reading a response from the SCGI server. | |
| 981 The timeout is set only between two successive read operations, | |
| 982 not for the transmission of the whole response. | |
| 983 If the SCGI server does not transmit anything within this time, | |
| 984 the connection is closed. | |
| 985 </para> | |
| 986 | |
| 987 </directive> | |
| 988 | |
| 989 | |
| 990 <directive name="scgi_pass_request_body"> | |
| 991 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 992 <default>on</default> | |
| 993 <context>http</context> | |
| 994 <context>server</context> | |
| 995 <context>location</context> | |
| 996 | |
| 997 <para> | |
| 998 Indicates whether the original request body is passed | |
| 999 to the SCGI server. | |
| 1000 See also the <link id="scgi_pass_request_headers"/> directive. | |
| 1001 </para> | |
| 1002 | |
| 1003 </directive> | |
| 1004 | |
| 1005 | |
| 1006 <directive name="scgi_pass_request_headers"> | |
| 1007 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 1008 <default>on</default> | |
| 1009 <context>http</context> | |
| 1010 <context>server</context> | |
| 1011 <context>location</context> | |
| 1012 | |
| 1013 <para> | |
| 1014 Indicates whether the header fields of the original request are passed | |
| 1015 to the SCGI server. | |
| 1016 See also the <link id="scgi_pass_request_body"/> directive. | |
| 1017 </para> | |
| 1018 | |
| 1019 </directive> | |
| 1020 | |
| 1021 | |
| 1022 <directive name="scgi_send_timeout"> | |
| 1023 <syntax><value>time</value></syntax> | |
| 1024 <default>60s</default> | |
| 1025 <context>http</context> | |
| 1026 <context>server</context> | |
| 1027 <context>location</context> | |
| 1028 | |
| 1029 <para> | |
| 1030 Sets a timeout for transmitting a request to the SCGI server. | |
| 1031 The timeout is set only between two successive write operations, | |
| 1032 not for the transmission of the whole request. | |
| 1033 If the SCGI server does not receive anything within this time, | |
| 1034 the connection is closed. | |
| 1035 </para> | |
| 1036 | |
| 1037 </directive> | |
| 1038 | |
| 1039 | |
| 1040 <directive name="scgi_store"> | |
| 1041 <syntax> | |
| 1042 <literal>on</literal> | | |
| 1043 <literal>off</literal> | | |
| 1044 <value>string</value></syntax> | |
| 1045 <default>off</default> | |
| 1046 <context>http</context> | |
| 1047 <context>server</context> | |
| 1048 <context>location</context> | |
| 1049 | |
| 1050 <para> | |
| 1051 Enables saving of files to a disk. | |
| 1052 The <literal>on</literal> parameter saves files with paths | |
| 1053 corresponding to the directives | |
| 1054 <link doc="ngx_http_core_module.xml" id="alias"/> or | |
| 1055 <link doc="ngx_http_core_module.xml" id="root"/>. | |
| 1056 The <literal>off</literal> parameter disables saving of files. | |
| 1057 In addition, the file name can be set explicitly using the | |
| 1058 <value>string</value> with variables: | |
| 1059 <example> | |
| 1060 scgi_store /data/www$original_uri; | |
| 1061 </example> | |
| 1062 </para> | |
| 1063 | |
| 1064 <para> | |
| 1065 The modification time of files is set according to the received | |
| 1066 <header>Last-Modified</header> response header field. | |
| 1067 The response is first written to a temporary file, | |
| 1068 and then the file is renamed. | |
| 1069 Starting from version 0.8.9, temporary files and the persistent store | |
| 1070 can be put on different file systems. | |
| 1071 However, be aware that in this case a file is copied | |
| 1072 across two file systems instead of the cheap renaming operation. | |
| 1073 It is thus recommended that for any given location both saved files and a | |
| 1074 directory holding temporary files, set by the <link id="scgi_temp_path"/> | |
| 1075 directive, are put on the same file system. | |
| 1076 </para> | |
| 1077 | |
| 1078 <para> | |
| 1079 This directive can be used to create local copies of static unchangeable | |
| 1080 files, e.g.: | |
| 1081 <example> | |
| 1082 location /images/ { | |
|
1184
55857cbf562d
Fixed alignment issues after mechanical conversion from fastcgi.
Ruslan Ermilov <ru@nginx.com>
parents:
1182
diff
changeset
|
1083 root /data/www; |
|
55857cbf562d
Fixed alignment issues after mechanical conversion from fastcgi.
Ruslan Ermilov <ru@nginx.com>
parents:
1182
diff
changeset
|
1084 error_page 404 = /fetch$uri; |
| 1180 | 1085 } |
| 1086 | |
| 1087 location /fetch/ { | |
| 1088 internal; | |
| 1089 | |
| 1090 scgi_pass backend:9000; | |
| 1091 ... | |
| 1092 | |
| 1093 scgi_store on; | |
| 1094 scgi_store_access user:rw group:rw all:r; | |
| 1095 scgi_temp_path /data/temp; | |
| 1096 | |
|
1184
55857cbf562d
Fixed alignment issues after mechanical conversion from fastcgi.
Ruslan Ermilov <ru@nginx.com>
parents:
1182
diff
changeset
|
1097 alias /data/www/; |
| 1180 | 1098 } |
| 1099 </example> | |
| 1100 </para> | |
| 1101 | |
| 1102 </directive> | |
| 1103 | |
| 1104 | |
| 1105 <directive name="scgi_store_access"> | |
| 1106 <syntax><value>users</value>:<value>permissions</value> ...</syntax> | |
| 1107 <default>user:rw</default> | |
| 1108 <context>http</context> | |
| 1109 <context>server</context> | |
| 1110 <context>location</context> | |
| 1111 | |
| 1112 <para> | |
| 1113 Sets access permissions for newly created files and directories, e.g.: | |
| 1114 <example> | |
| 1115 scgi_store_access user:rw group:rw all:r; | |
| 1116 </example> | |
| 1117 </para> | |
| 1118 | |
| 1119 <para> | |
| 1120 If any <literal>group</literal> or <literal>all</literal> access permissions | |
| 1121 are specified then <literal>user</literal> permissions may be omitted: | |
| 1122 <example> | |
| 1123 scgi_store_access group:rw all:r; | |
| 1124 </example> | |
| 1125 </para> | |
| 1126 | |
| 1127 </directive> | |
| 1128 | |
| 1129 | |
| 1130 <directive name="scgi_temp_file_write_size"> | |
| 1131 <syntax><value>size</value></syntax> | |
| 1132 <default>8k|16k</default> | |
| 1133 <context>http</context> | |
| 1134 <context>server</context> | |
| 1135 <context>location</context> | |
| 1136 | |
| 1137 <para> | |
| 1138 Limits the <value>size</value> of data written to a temporary file | |
| 1139 at a time, when buffering of responses from the SCGI server | |
| 1140 to temporary files is enabled. | |
| 1141 By default, <value>size</value> is limited by two buffers set by the | |
| 1142 <link id="scgi_buffer_size"/> and <link id="scgi_buffers"/> directives. | |
| 1143 The maximum size of a temporary file is set by the | |
| 1144 <link id="scgi_max_temp_file_size"/> directive. | |
| 1145 </para> | |
| 1146 | |
| 1147 </directive> | |
| 1148 | |
| 1149 | |
| 1150 <directive name="scgi_temp_path"> | |
| 1151 <syntax> | |
| 1152 <value>path</value> | |
| 1153 [<value>level1</value> | |
| 1154 [<value>level2</value> | |
| 1155 [<value>level3</value>]]]</syntax> | |
| 1156 <default>scgi_temp</default> | |
| 1157 <context>http</context> | |
| 1158 <context>server</context> | |
| 1159 <context>location</context> | |
| 1160 | |
| 1161 <para> | |
| 1162 Defines a directory for storing temporary files | |
| 1163 with data received from SCGI servers. | |
| 1164 Up to three-level subdirectory hierarchy can be used underneath the specified | |
| 1165 directory. | |
| 1166 For example, in the following configuration | |
| 1167 <example> | |
| 1168 scgi_temp_path /spool/nginx/scgi_temp 1 2; | |
| 1169 </example> | |
| 1170 a temporary file might look like this: | |
| 1171 <example> | |
| 1172 /spool/nginx/scgi_temp/<emphasis>7</emphasis>/<emphasis>45</emphasis>/00000123<emphasis>457</emphasis> | |
| 1173 </example> | |
| 1174 </para> | |
| 1175 | |
| 1176 </directive> | |
| 1177 | |
| 1178 </section> | |
| 1179 | |
| 1180 </module> |