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annotate xml/en/docs/http/ngx_http_scgi_module.xml @ 1379:91f5c089f4ca
Documented fastcgi_cache_lock_age and look-alikes.
| author | Ruslan Ermilov <ru@nginx.com> |
|---|---|
| date | Fri, 19 Dec 2014 12:26:10 +0300 |
| parents | 25db29c8875e |
| children | 94cac978bda3 |
| 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="13"> |
| 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 | |
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236 <directive name="scgi_cache_lock_age"> |
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237 <syntax><value>time</value></syntax> |
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238 <default>5s</default> |
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239 <context>http</context> |
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240 <context>server</context> |
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241 <context>location</context> |
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242 <appeared-in>1.7.8</appeared-in> |
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243 |
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244 <para> |
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245 If the last request passed to the SCGI server |
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246 for populating a new cache element |
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247 has not completed for the specified <value>time</value>, |
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248 one more request may be passed to the SCGI server. |
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249 </para> |
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250 |
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251 </directive> |
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252 |
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253 |
| 1180 | 254 <directive name="scgi_cache_lock_timeout"> |
| 255 <syntax><value>time</value></syntax> | |
| 256 <default>5s</default> | |
| 257 <context>http</context> | |
| 258 <context>server</context> | |
| 259 <context>location</context> | |
| 260 <appeared-in>1.1.12</appeared-in> | |
| 261 | |
| 262 <para> | |
| 263 Sets a timeout for <link id="scgi_cache_lock"/>. | |
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264 When the <value>time</value> expires, |
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265 the request will be passed to the SCGI server, |
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266 however, the response will not be cached. |
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267 <note> |
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268 Before 1.7.8, the response could be cached. |
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269 </note> |
| 1180 | 270 </para> |
| 271 | |
| 272 </directive> | |
| 273 | |
| 274 | |
| 275 <directive name="scgi_cache_methods"> | |
| 276 <syntax> | |
| 277 <literal>GET</literal> | | |
| 278 <literal>HEAD</literal> | | |
| 279 <literal>POST</literal> | |
| 280 ...</syntax> | |
| 281 <default>GET HEAD</default> | |
| 282 <context>http</context> | |
| 283 <context>server</context> | |
| 284 <context>location</context> | |
| 285 | |
| 286 <para> | |
| 287 If the client request method is listed in this directive then | |
| 288 the response will be cached. | |
| 289 “<literal>GET</literal>” and “<literal>HEAD</literal>” methods are always | |
| 290 added to the list, though it is recommended to specify them explicitly. | |
| 291 See also the <link id="scgi_no_cache"/> directive. | |
| 292 </para> | |
| 293 | |
| 294 </directive> | |
| 295 | |
| 296 | |
| 297 <directive name="scgi_cache_min_uses"> | |
| 298 <syntax><value>number</value></syntax> | |
| 299 <default>1</default> | |
| 300 <context>http</context> | |
| 301 <context>server</context> | |
| 302 <context>location</context> | |
| 303 | |
| 304 <para> | |
| 305 Sets the <value>number</value> of requests after which the response | |
| 306 will be cached. | |
| 307 </para> | |
| 308 | |
| 309 </directive> | |
| 310 | |
| 311 | |
| 312 <directive name="scgi_cache_path"> | |
| 313 <syntax> | |
| 314 <value>path</value> | |
| 315 [<literal>levels</literal>=<value>levels</value>] | |
| 316 <literal>keys_zone</literal>=<value>name</value>:<value>size</value> | |
| 317 [<literal>inactive</literal>=<value>time</value>] | |
| 318 [<literal>max_size</literal>=<value>size</value>] | |
| 319 [<literal>loader_files</literal>=<value>number</value>] | |
| 320 [<literal>loader_sleep</literal>=<value>time</value>] | |
| 321 [<literal>loader_threshold</literal>=<value>time</value>]</syntax> | |
| 322 <default/> | |
| 323 <context>http</context> | |
| 324 | |
| 325 <para> | |
| 326 Sets the path and other parameters of a cache. | |
| 327 Cache data are stored in files. | |
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328 The file name in a cache is a result of |
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329 applying the MD5 function to the |
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330 <link id="scgi_cache_key">cache key</link>. |
| 1180 | 331 The <literal>levels</literal> parameter defines hierarchy levels of a cache. |
| 332 For example, in the following configuration | |
| 333 <example> | |
| 334 scgi_cache_path /data/nginx/cache levels=1:2 keys_zone=one:10m; | |
| 335 </example> | |
| 336 file names in a cache will look like this: | |
| 337 <example> | |
| 338 /data/nginx/cache/<emphasis>c</emphasis>/<emphasis>29</emphasis>/b7f54b2df7773722d382f4809d650<emphasis>29c</emphasis> | |
| 339 </example> | |
| 340 </para> | |
| 341 | |
| 342 <para> | |
| 343 A cached response is first written to a temporary file, | |
| 344 and then the file is renamed. | |
| 345 Starting from version 0.8.9, temporary files and the cache can be put on | |
| 346 different file systems. | |
| 347 However, be aware that in this case a file is copied | |
| 348 across two file systems instead of the cheap renaming operation. | |
| 349 It is thus recommended that for any given location both cache and a directory | |
| 350 holding temporary files, set by the <link id="scgi_temp_path"/> directive, | |
| 351 are put on the same file system. | |
| 352 </para> | |
| 353 | |
| 354 <para> | |
| 355 In addition, all active keys and information about data are stored | |
| 356 in a shared memory zone, whose <value>name</value> and <value>size</value> | |
| 357 are configured by the <literal>keys_zone</literal> parameter. | |
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358 One megabyte zone can store about 8 thousand keys. |
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359 </para> |
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360 |
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361 <para> |
| 1180 | 362 Cached data that are not accessed during the time specified by the |
| 363 <literal>inactive</literal> parameter get removed from the cache | |
| 364 regardless of their freshness. | |
| 365 By default, <literal>inactive</literal> is set to 10 minutes. | |
| 366 </para> | |
| 367 | |
| 368 <para> | |
| 369 The special “cache manager” process monitors the maximum cache size set | |
| 370 by the <literal>max_size</literal> parameter. | |
| 371 When this size is exceeded, it removes the least recently used data. | |
| 372 </para> | |
| 373 | |
| 374 <para> | |
| 375 A minute after the start the special “cache loader” process is activated. | |
| 376 It loads information about previously cached data stored on file system | |
| 377 into a cache zone. | |
| 378 The loading is done in iterations. | |
| 379 During one iteration no more than <literal>loader_files</literal> items | |
| 380 are loaded (by default, 100). | |
| 381 Besides, the duration of one iteration is limited by the | |
| 382 <literal>loader_threshold</literal> parameter (by default, 200 milliseconds). | |
| 383 Between iterations, a pause configured by the <literal>loader_sleep</literal> | |
| 384 parameter (by default, 50 milliseconds) is made. | |
| 385 </para> | |
| 386 | |
| 387 </directive> | |
| 388 | |
| 389 | |
| 390 <directive name="scgi_cache_purge"> | |
| 391 <syntax>string ...</syntax> | |
| 392 <default/> | |
| 393 <context>http</context> | |
| 394 <context>server</context> | |
| 395 <context>location</context> | |
| 396 <appeared-in>1.5.7</appeared-in> | |
| 397 | |
| 398 <para> | |
| 399 Defines conditions under which the request will be considered a cache | |
| 400 purge request. | |
| 401 If at least one value of the string parameters is not empty and is not equal | |
| 402 to “0” then the cache entry with a corresponding | |
| 403 <link id="scgi_cache_key">cache key</link> is removed. | |
| 404 The result of successful operation is indicated by returning | |
| 405 the <http-status code="204" text="No Content"/> response. | |
| 406 </para> | |
| 407 | |
| 408 <para> | |
| 409 If the <link id="scgi_cache_key">cache key</link> of a purge request ends | |
| 410 with an asterisk (“<literal>*</literal>”), all cache entries matching the | |
| 411 wildcard key will be removed from the cache. | |
| 412 </para> | |
| 413 | |
| 414 <para> | |
| 415 Example configuration: | |
| 416 <example> | |
| 417 scgi_cache_path /data/nginx/cache keys_zone=cache_zone:10m; | |
| 418 | |
| 419 map $request_method $purge_method { | |
| 420 PURGE 1; | |
| 421 default 0; | |
| 422 } | |
| 423 | |
| 424 server { | |
| 425 ... | |
| 426 location / { | |
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427 scgi_pass backend; |
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428 scgi_cache cache_zone; |
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429 scgi_cache_key $uri; |
| 1180 | 430 scgi_cache_purge $purge_method; |
| 431 } | |
| 432 } | |
| 433 </example> | |
| 434 <note> | |
| 435 This functionality is available as part of our | |
| 436 <commercial_version>commercial subscription</commercial_version>. | |
| 437 </note> | |
| 438 </para> | |
| 439 | |
| 440 </directive> | |
| 441 | |
| 442 | |
| 443 <directive name="scgi_cache_revalidate"> | |
| 444 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 445 <default>off</default> | |
| 446 <context>http</context> | |
| 447 <context>server</context> | |
| 448 <context>location</context> | |
| 449 <appeared-in>1.5.7</appeared-in> | |
| 450 | |
| 451 <para> | |
| 452 Enables revalidation of expired cache items using conditional requests with | |
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453 the <header>If-Modified-Since</header> and <header>If-None-Match</header> |
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454 header fields. |
| 1180 | 455 </para> |
| 456 | |
| 457 </directive> | |
| 458 | |
| 459 | |
| 460 <directive name="scgi_cache_use_stale"> | |
| 461 <syntax> | |
| 462 <literal>error</literal> | | |
| 463 <literal>timeout</literal> | | |
| 464 <literal>invalid_header</literal> | | |
| 465 <literal>updating</literal> | | |
| 466 <literal>http_500</literal> | | |
| 467 <literal>http_503</literal> | | |
| 468 <literal>http_403</literal> | | |
| 469 <literal>http_404</literal> | | |
| 470 <literal>off</literal> | |
| 471 ...</syntax> | |
| 472 <default>off</default> | |
| 473 <context>http</context> | |
| 474 <context>server</context> | |
| 475 <context>location</context> | |
| 476 | |
| 477 <para> | |
| 478 Determines in which cases a stale cached response can be used | |
| 479 when an error occurs during communication with the SCGI server. | |
| 480 The directive’s parameters match the parameters of the | |
| 481 <link id="scgi_next_upstream"/> directive. | |
| 482 </para> | |
| 483 | |
| 484 <para> | |
| 485 Additionally, the <literal>updating</literal> parameter permits | |
| 486 using a stale cached response if it is currently being updated. | |
| 487 This allows minimizing the number of accesses to SCGI servers | |
| 488 when updating cached data. | |
| 489 </para> | |
| 490 | |
| 491 <para> | |
| 492 To minimize the number of accesses to SCGI servers when | |
| 493 populating a new cache element, the <link id="scgi_cache_lock"/> | |
| 494 directive can be used. | |
| 495 </para> | |
| 496 | |
| 497 </directive> | |
| 498 | |
| 499 | |
| 500 <directive name="scgi_cache_valid"> | |
| 501 <syntax>[<value>code</value> ...] <value>time</value></syntax> | |
| 502 <default/> | |
| 503 <context>http</context> | |
| 504 <context>server</context> | |
| 505 <context>location</context> | |
| 506 | |
| 507 <para> | |
| 508 Sets caching time for different response codes. | |
| 509 For example, the following directives | |
| 510 <example> | |
| 511 scgi_cache_valid 200 302 10m; | |
| 512 scgi_cache_valid 404 1m; | |
| 513 </example> | |
| 514 set 10 minutes of caching for responses with codes 200 and 302 | |
| 515 and 1 minute for responses with code 404. | |
| 516 </para> | |
| 517 | |
| 518 <para> | |
| 519 If only caching <value>time</value> is specified | |
| 520 <example> | |
| 521 scgi_cache_valid 5m; | |
| 522 </example> | |
| 523 then only 200, 301, and 302 responses are cached. | |
| 524 </para> | |
| 525 | |
| 526 <para> | |
| 527 In addition, the <literal>any</literal> parameter can be specified | |
| 528 to cache any responses: | |
| 529 <example> | |
| 530 scgi_cache_valid 200 302 10m; | |
| 531 scgi_cache_valid 301 1h; | |
| 532 scgi_cache_valid any 1m; | |
| 533 </example> | |
| 534 </para> | |
| 535 | |
| 536 <para> | |
| 537 Parameters of caching can also be set directly | |
| 538 in the response header. | |
| 539 This has higher priority than setting of caching time using the directive. | |
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540 <list type="bullet" compact="no"> |
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541 |
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542 <listitem> |
| 1180 | 543 The <header>X-Accel-Expires</header> header field sets caching time of a |
| 544 response in seconds. | |
| 545 The zero value disables caching for a response. | |
| 546 If the value starts with the <literal>@</literal> prefix, it sets an absolute | |
| 547 time in seconds since Epoch, up to which the response may be cached. | |
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548 </listitem> |
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549 |
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550 <listitem> |
| 1180 | 551 If the header does not include the <header>X-Accel-Expires</header> field, |
| 552 parameters of caching may be set in the header fields | |
| 553 <header>Expires</header> or <header>Cache-Control</header>. | |
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554 </listitem> |
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555 |
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556 <listitem> |
| 1180 | 557 If the header includes the <header>Set-Cookie</header> field, such a |
| 558 response will not be cached. | |
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559 </listitem> |
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560 |
|
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561 <listitem> |
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562 If the header includes the <header>Vary</header> field |
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563 with the special value “<literal>*</literal>”, such a |
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564 response will not be cached (1.7.7). |
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565 If the header includes the <header>Vary</header> field |
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566 with another value, such a response will be cached |
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567 taking into account the corresponding request header fields (1.7.7). |
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568 </listitem> |
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569 |
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570 </list> |
| 1180 | 571 Processing of one or more of these response header fields can be disabled |
| 572 using the <link id="scgi_ignore_headers"/> directive. | |
| 573 </para> | |
| 574 | |
| 575 </directive> | |
| 576 | |
| 577 | |
| 578 <directive name="scgi_connect_timeout"> | |
| 579 <syntax><value>time</value></syntax> | |
| 580 <default>60s</default> | |
| 581 <context>http</context> | |
| 582 <context>server</context> | |
| 583 <context>location</context> | |
| 584 | |
| 585 <para> | |
| 586 Defines a timeout for establishing a connection with an SCGI server. | |
| 587 It should be noted that this timeout cannot usually exceed 75 seconds. | |
| 588 </para> | |
| 589 | |
| 590 </directive> | |
| 591 | |
| 592 | |
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593 <directive name="scgi_force_ranges"> |
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594 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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595 <default>off</default> |
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596 <context>http</context> |
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597 <context>server</context> |
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598 <context>location</context> |
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599 <appeared-in>1.7.7</appeared-in> |
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600 |
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601 <para> |
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602 Enables byte-range support |
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603 for both cached and uncached responses from the SCGI server |
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604 regardless of the <header>Accept-Ranges</header> field in these responses. |
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605 </para> |
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606 |
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607 </directive> |
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608 |
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609 |
| 1180 | 610 <directive name="scgi_hide_header"> |
| 611 <syntax><value>field</value></syntax> | |
| 612 <default/> | |
| 613 <context>http</context> | |
| 614 <context>server</context> | |
| 615 <context>location</context> | |
| 616 | |
| 617 <para> | |
| 618 By default, | |
| 619 nginx does not pass the header fields <header>Status</header> and | |
| 620 <header>X-Accel-...</header> from the response of an SCGI | |
| 621 server to a client. | |
| 622 The <literal>scgi_hide_header</literal> directive sets additional fields | |
| 623 that will not be passed. | |
| 624 If, on the contrary, the passing of fields needs to be permitted, | |
| 625 the <link id="scgi_pass_header"/> directive can be used. | |
| 626 </para> | |
| 627 | |
| 628 </directive> | |
| 629 | |
| 630 | |
| 631 <directive name="scgi_ignore_client_abort"> | |
| 632 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 633 <default>off</default> | |
| 634 <context>http</context> | |
| 635 <context>server</context> | |
| 636 <context>location</context> | |
| 637 | |
| 638 <para> | |
| 639 Determines whether the connection with an SCGI server should be | |
| 640 closed when a client closes the connection without waiting | |
| 641 for a response. | |
| 642 </para> | |
| 643 | |
| 644 </directive> | |
| 645 | |
| 646 | |
| 647 <directive name="scgi_ignore_headers"> | |
| 648 <syntax><value>field</value> ...</syntax> | |
| 649 <default/> | |
| 650 <context>http</context> | |
| 651 <context>server</context> | |
| 652 <context>location</context> | |
| 653 | |
| 654 <para> | |
| 655 Disables processing of certain response header fields from the SCGI server. | |
| 656 The following fields can be ignored: <header>X-Accel-Redirect</header>, | |
| 657 <header>X-Accel-Expires</header>, <header>X-Accel-Limit-Rate</header> (1.1.6), | |
| 658 <header>X-Accel-Buffering</header> (1.1.6), | |
| 659 <header>X-Accel-Charset</header> (1.1.6), <header>Expires</header>, | |
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660 <header>Cache-Control</header>, <header>Set-Cookie</header> (0.8.44), |
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661 and <header>Vary</header> (1.7.7). |
| 1180 | 662 </para> |
| 663 | |
| 664 <para> | |
| 665 If not disabled, processing of these header fields has the following | |
| 666 effect: | |
| 667 <list type="bullet" compact="no"> | |
| 668 | |
| 669 <listitem> | |
| 670 <header>X-Accel-Expires</header>, <header>Expires</header>, | |
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671 <header>Cache-Control</header>, <header>Set-Cookie</header>, |
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672 and <header>Vary</header> |
| 1180 | 673 set the parameters of response <link id="scgi_cache_valid">caching</link>; |
| 674 </listitem> | |
| 675 | |
| 676 <listitem> | |
| 677 <header>X-Accel-Redirect</header> performs an | |
| 678 <link doc="ngx_http_core_module.xml" id="internal">internal | |
| 679 redirect</link> to the specified URI; | |
| 680 </listitem> | |
| 681 | |
| 682 <listitem> | |
| 683 <header>X-Accel-Limit-Rate</header> sets the | |
| 684 <link doc="ngx_http_core_module.xml" id="limit_rate">rate | |
| 685 limit</link> for transmission of a response to a client; | |
| 686 </listitem> | |
| 687 | |
| 688 <listitem> | |
| 689 <header>X-Accel-Buffering</header> enables or disables | |
| 690 <link id="scgi_buffering">buffering</link> of a response; | |
| 691 </listitem> | |
| 692 | |
| 693 <listitem> | |
| 694 <header>X-Accel-Charset</header> sets the desired | |
| 695 <link doc="ngx_http_charset_module.xml" id="charset"/> | |
| 696 of a response. | |
| 697 </listitem> | |
| 698 | |
| 699 </list> | |
| 700 </para> | |
| 701 | |
| 702 </directive> | |
| 703 | |
| 704 | |
| 705 <directive name="scgi_intercept_errors"> | |
| 706 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 707 <default>off</default> | |
| 708 <context>http</context> | |
| 709 <context>server</context> | |
| 710 <context>location</context> | |
| 711 | |
| 712 <para> | |
| 713 Determines whether an SCGI server responses with codes greater than or equal | |
| 714 to 300 should be passed to a client or be redirected to nginx for processing | |
| 715 with the <link doc="ngx_http_core_module.xml" id="error_page"/> directive. | |
| 716 </para> | |
| 717 | |
| 718 </directive> | |
| 719 | |
| 720 | |
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721 <directive name="scgi_limit_rate"> |
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722 <syntax><value>rate</value></syntax> |
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723 <default>0</default> |
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724 <context>http</context> |
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725 <context>server</context> |
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726 <context>location</context> |
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727 <appeared-in>1.7.7</appeared-in> |
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728 |
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729 <para> |
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730 Limits the speed of reading the response from the SCGI server. |
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731 The <value>rate</value> is specified in bytes per second. |
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732 The zero value disables rate limiting. |
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733 The limit is set per a request, and so if nginx simultaneously opens |
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734 two connections to the SCGI server, |
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735 the overall rate will be twice as much as the specified limit. |
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736 The limitation works only if |
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737 <link id="scgi_buffering">buffering</link> of responses from the SCGI |
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738 server is enabled. |
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739 </para> |
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|
740 |
|
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|
741 </directive> |
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|
742 |
|
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|
743 |
| 1180 | 744 <directive name="scgi_max_temp_file_size"> |
| 745 <syntax><value>size</value></syntax> | |
| 746 <default>1024m</default> | |
| 747 <context>http</context> | |
| 748 <context>server</context> | |
| 749 <context>location</context> | |
| 750 | |
| 751 <para> | |
| 752 When <link id="scgi_buffering">buffering</link> of responses from the SCGI | |
| 753 server is enabled, and the whole response does not fit into the buffers | |
| 754 set by the <link id="scgi_buffer_size"/> and <link id="scgi_buffers"/> | |
| 755 directives, a part of the response can be saved to a temporary file. | |
| 756 This directive sets the maximum <value>size</value> of the temporary file. | |
| 757 The size of data written to the temporary file at a time is set | |
| 758 by the <link id="scgi_temp_file_write_size"/> directive. | |
| 759 </para> | |
| 760 | |
| 761 <para> | |
| 762 The zero value disables buffering of responses to temporary files. | |
| 763 </para> | |
| 764 | |
|
1352
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|
765 <para> |
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|
766 <note> |
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767 This restriction does not apply to responses |
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|
768 that will be <link id="scgi_cache">cached</link> |
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|
769 or <link id="scgi_store">stored</link> on disk. |
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|
770 </note> |
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|
771 </para> |
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|
772 |
| 1180 | 773 </directive> |
| 774 | |
| 775 | |
| 776 <directive name="scgi_next_upstream"> | |
| 777 <syntax> | |
| 778 <literal>error</literal> | | |
| 779 <literal>timeout</literal> | | |
| 780 <literal>invalid_header</literal> | | |
| 781 <literal>http_500</literal> | | |
| 782 <literal>http_503</literal> | | |
| 783 <literal>http_403</literal> | | |
| 784 <literal>http_404</literal> | | |
| 785 <literal>off</literal> | |
| 786 ...</syntax> | |
| 787 <default>error timeout</default> | |
| 788 <context>http</context> | |
| 789 <context>server</context> | |
| 790 <context>location</context> | |
| 791 | |
| 792 <para> | |
| 793 Specifies in which cases a request should be passed to the next server: | |
| 794 <list type="tag"> | |
| 795 | |
| 796 <tag-name><literal>error</literal></tag-name> | |
| 797 <tag-desc>an error occurred while establishing a connection with the | |
| 798 server, passing a request to it, or reading the response header;</tag-desc> | |
| 799 | |
| 800 <tag-name><literal>timeout</literal></tag-name> | |
| 801 <tag-desc>a timeout has occurred while establishing a connection with the | |
| 802 server, passing a request to it, or reading the response header;</tag-desc> | |
| 803 | |
| 804 <tag-name><literal>invalid_header</literal></tag-name> | |
| 805 <tag-desc>a server returned an empty or invalid response;</tag-desc> | |
| 806 | |
| 807 <tag-name><literal>http_500</literal></tag-name> | |
| 808 <tag-desc>a server returned a response with the code 500;</tag-desc> | |
| 809 | |
| 810 <tag-name><literal>http_503</literal></tag-name> | |
| 811 <tag-desc>a server returned a response with the code 503;</tag-desc> | |
| 812 | |
| 813 <tag-name><literal>http_403</literal></tag-name> | |
| 814 <tag-desc>a server returned a response with the code 403;</tag-desc> | |
| 815 | |
| 816 <tag-name><literal>http_404</literal></tag-name> | |
| 817 <tag-desc>a server returned a response with the code 404;</tag-desc> | |
| 818 | |
| 819 <tag-name><literal>off</literal></tag-name> | |
| 820 <tag-desc>disables passing a request to the next server.</tag-desc> | |
| 821 | |
| 822 </list> | |
| 823 </para> | |
| 824 | |
| 825 <para> | |
| 826 One should bear in mind that passing a request to the next server is | |
| 827 only possible if nothing has been sent to a client yet. | |
| 828 That is, if an error or timeout occurs in the middle of the | |
| 829 transferring of a response, fixing this is impossible. | |
| 830 </para> | |
| 831 | |
| 832 <para> | |
|
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833 The directive also defines what is considered an |
|
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834 <link doc="ngx_http_upstream_module.xml" id="max_fails">unsuccessful |
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|
835 attempt</link> of communication with a server. |
| 1180 | 836 The cases of <literal>error</literal>, <literal>timeout</literal> and |
| 837 <literal>invalid_header</literal> are always considered unsuccessful attempts, | |
| 838 even if they are not specified in the directive. | |
| 839 The cases of <literal>http_500</literal> and <literal>http_503</literal> are | |
| 840 considered unsuccessful attempts only if they are specified in the directive. | |
| 841 The cases of <literal>http_403</literal> and <literal>http_404</literal> | |
| 842 are never considered unsuccessful attempts. | |
| 843 </para> | |
| 844 | |
|
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845 <para> |
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846 Passing a request to the next server can be limited by |
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847 <link id="scgi_next_upstream_tries">the number of tries</link> |
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848 and by <link id="scgi_next_upstream_timeout">time</link>. |
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849 </para> |
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|
850 |
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|
851 </directive> |
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|
852 |
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|
853 |
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|
854 <directive name="scgi_next_upstream_timeout"> |
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855 <syntax><value>time</value></syntax> |
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856 <default>0</default> |
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857 <context>http</context> |
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858 <context>server</context> |
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|
859 <context>location</context> |
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860 <appeared-in>1.7.5</appeared-in> |
|
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|
861 |
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|
862 <para> |
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|
863 Limits the time allowed to pass a request to the |
|
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|
864 <link id="scgi_next_upstream">next server</link>. |
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|
865 The <literal>0</literal> value turns off this limitation. |
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866 </para> |
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867 |
|
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|
868 </directive> |
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|
869 |
|
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|
870 |
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871 <directive name="scgi_next_upstream_tries"> |
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872 <syntax><value>number</value></syntax> |
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873 <default>0</default> |
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874 <context>http</context> |
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|
875 <context>server</context> |
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876 <context>location</context> |
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|
877 <appeared-in>1.7.5</appeared-in> |
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|
878 |
|
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|
879 <para> |
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|
880 Limits the number of possible tries for passing a request to the |
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|
881 <link id="scgi_next_upstream">next server</link>. |
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882 The <literal>0</literal> value turns off this limitation. |
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883 </para> |
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|
884 |
| 1180 | 885 </directive> |
| 886 | |
| 887 | |
| 888 <directive name="scgi_no_cache"> | |
| 889 <syntax><value>string</value> ...</syntax> | |
| 890 <default/> | |
| 891 <context>http</context> | |
| 892 <context>server</context> | |
| 893 <context>location</context> | |
| 894 | |
| 895 <para> | |
| 896 Defines conditions under which the response will not be saved to a cache. | |
| 897 If at least one value of the string parameters is not empty and is not | |
| 898 equal to “0” then the response will not be saved: | |
| 899 <example> | |
| 900 scgi_no_cache $cookie_nocache $arg_nocache$arg_comment; | |
| 901 scgi_no_cache $http_pragma $http_authorization; | |
| 902 </example> | |
| 903 Can be used along with the <link id="scgi_cache_bypass"/> directive. | |
| 904 </para> | |
| 905 | |
| 906 </directive> | |
| 907 | |
| 908 | |
| 909 <directive name="scgi_param"> | |
| 910 <syntax> | |
| 911 <value>parameter</value> <value>value</value> | |
| 912 [<literal>if_not_empty</literal>]</syntax> | |
| 913 <default/> | |
| 914 <context>http</context> | |
| 915 <context>server</context> | |
| 916 <context>location</context> | |
| 917 | |
| 918 <para> | |
| 919 Sets a <value>parameter</value> that should be passed to the SCGI server. | |
| 920 The <value>value</value> can contain text, variables, and their combination. | |
| 921 These directives are inherited from the previous level if and | |
| 922 only if there are no | |
| 923 <literal>scgi_param</literal> | |
| 924 directives defined on the current level. | |
| 925 </para> | |
| 926 | |
| 927 <para> | |
| 928 Standard | |
| 929 <link url="http://tools.ietf.org/html/rfc3875#section-4.1">CGI | |
| 930 environment variables</link> | |
| 931 should be provided as SCGI headers, see the <path>scgi_params</path> file | |
| 932 provided in the distribution: | |
| 933 <example> | |
| 934 location / { | |
| 935 include scgi_params; | |
| 936 ... | |
| 937 } | |
| 938 </example> | |
| 939 </para> | |
| 940 | |
|
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941 <para> |
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942 If a directive is specified with <literal>if_not_empty</literal> (1.1.11) then |
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|
943 such a parameter will not be passed to the server until its value is not empty: |
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944 <example> |
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945 scgi_param HTTPS $https if_not_empty; |
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946 </example> |
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947 </para> |
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948 |
| 1180 | 949 </directive> |
| 950 | |
| 951 | |
| 952 <directive name="scgi_pass"> | |
| 953 <syntax><value>address</value></syntax> | |
| 954 <default/> | |
| 955 <context>location</context> | |
| 956 <context>if in location</context> | |
| 957 | |
| 958 <para> | |
| 959 Sets the address of an SCGI server. | |
| 960 The address can be specified as a domain name or IP address, | |
| 961 and an optional port: | |
| 962 <example> | |
| 963 scgi_pass localhost:9000; | |
| 964 </example> | |
| 965 or as a UNIX-domain socket path: | |
| 966 <example> | |
| 967 scgi_pass unix:/tmp/scgi.socket; | |
| 968 </example> | |
| 969 </para> | |
| 970 | |
| 971 <para> | |
| 972 If a domain name resolves to several addresses, all of them will be | |
| 973 used in a round-robin fashion. | |
| 974 In addition, an address can be specified as a | |
| 975 <link doc="ngx_http_upstream_module.xml">server group</link>. | |
| 976 </para> | |
| 977 | |
| 978 </directive> | |
| 979 | |
| 980 | |
| 981 <directive name="scgi_pass_header"> | |
| 982 <syntax><value>field</value></syntax> | |
| 983 <default/> | |
| 984 <context>http</context> | |
| 985 <context>server</context> | |
| 986 <context>location</context> | |
| 987 | |
| 988 <para> | |
| 989 Permits passing <link id="scgi_hide_header">otherwise disabled</link> header | |
| 990 fields from an SCGI server to a client. | |
| 991 </para> | |
| 992 | |
| 993 </directive> | |
| 994 | |
| 995 | |
| 996 <directive name="scgi_read_timeout"> | |
| 997 <syntax><value>time</value></syntax> | |
| 998 <default>60s</default> | |
| 999 <context>http</context> | |
| 1000 <context>server</context> | |
| 1001 <context>location</context> | |
| 1002 | |
| 1003 <para> | |
| 1004 Defines a timeout for reading a response from the SCGI server. | |
| 1005 The timeout is set only between two successive read operations, | |
| 1006 not for the transmission of the whole response. | |
| 1007 If the SCGI server does not transmit anything within this time, | |
| 1008 the connection is closed. | |
| 1009 </para> | |
| 1010 | |
| 1011 </directive> | |
| 1012 | |
| 1013 | |
| 1014 <directive name="scgi_pass_request_body"> | |
| 1015 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 1016 <default>on</default> | |
| 1017 <context>http</context> | |
| 1018 <context>server</context> | |
| 1019 <context>location</context> | |
| 1020 | |
| 1021 <para> | |
| 1022 Indicates whether the original request body is passed | |
| 1023 to the SCGI server. | |
| 1024 See also the <link id="scgi_pass_request_headers"/> directive. | |
| 1025 </para> | |
| 1026 | |
| 1027 </directive> | |
| 1028 | |
| 1029 | |
| 1030 <directive name="scgi_pass_request_headers"> | |
| 1031 <syntax><literal>on</literal> | <literal>off</literal></syntax> | |
| 1032 <default>on</default> | |
| 1033 <context>http</context> | |
| 1034 <context>server</context> | |
| 1035 <context>location</context> | |
| 1036 | |
| 1037 <para> | |
| 1038 Indicates whether the header fields of the original request are passed | |
| 1039 to the SCGI server. | |
| 1040 See also the <link id="scgi_pass_request_body"/> directive. | |
| 1041 </para> | |
| 1042 | |
| 1043 </directive> | |
| 1044 | |
| 1045 | |
| 1046 <directive name="scgi_send_timeout"> | |
| 1047 <syntax><value>time</value></syntax> | |
| 1048 <default>60s</default> | |
| 1049 <context>http</context> | |
| 1050 <context>server</context> | |
| 1051 <context>location</context> | |
| 1052 | |
| 1053 <para> | |
| 1054 Sets a timeout for transmitting a request to the SCGI server. | |
| 1055 The timeout is set only between two successive write operations, | |
| 1056 not for the transmission of the whole request. | |
| 1057 If the SCGI server does not receive anything within this time, | |
| 1058 the connection is closed. | |
| 1059 </para> | |
| 1060 | |
| 1061 </directive> | |
| 1062 | |
| 1063 | |
| 1064 <directive name="scgi_store"> | |
| 1065 <syntax> | |
| 1066 <literal>on</literal> | | |
| 1067 <literal>off</literal> | | |
| 1068 <value>string</value></syntax> | |
| 1069 <default>off</default> | |
| 1070 <context>http</context> | |
| 1071 <context>server</context> | |
| 1072 <context>location</context> | |
| 1073 | |
| 1074 <para> | |
| 1075 Enables saving of files to a disk. | |
| 1076 The <literal>on</literal> parameter saves files with paths | |
| 1077 corresponding to the directives | |
| 1078 <link doc="ngx_http_core_module.xml" id="alias"/> or | |
| 1079 <link doc="ngx_http_core_module.xml" id="root"/>. | |
| 1080 The <literal>off</literal> parameter disables saving of files. | |
| 1081 In addition, the file name can be set explicitly using the | |
| 1082 <value>string</value> with variables: | |
| 1083 <example> | |
| 1084 scgi_store /data/www$original_uri; | |
| 1085 </example> | |
| 1086 </para> | |
| 1087 | |
| 1088 <para> | |
| 1089 The modification time of files is set according to the received | |
| 1090 <header>Last-Modified</header> response header field. | |
| 1091 The response is first written to a temporary file, | |
| 1092 and then the file is renamed. | |
| 1093 Starting from version 0.8.9, temporary files and the persistent store | |
| 1094 can be put on different file systems. | |
| 1095 However, be aware that in this case a file is copied | |
| 1096 across two file systems instead of the cheap renaming operation. | |
| 1097 It is thus recommended that for any given location both saved files and a | |
| 1098 directory holding temporary files, set by the <link id="scgi_temp_path"/> | |
| 1099 directive, are put on the same file system. | |
| 1100 </para> | |
| 1101 | |
| 1102 <para> | |
| 1103 This directive can be used to create local copies of static unchangeable | |
| 1104 files, e.g.: | |
| 1105 <example> | |
| 1106 location /images/ { | |
|
1184
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1107 root /data/www; |
|
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parents:
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|
1108 error_page 404 = /fetch$uri; |
| 1180 | 1109 } |
| 1110 | |
| 1111 location /fetch/ { | |
| 1112 internal; | |
| 1113 | |
| 1114 scgi_pass backend:9000; | |
| 1115 ... | |
| 1116 | |
| 1117 scgi_store on; | |
| 1118 scgi_store_access user:rw group:rw all:r; | |
| 1119 scgi_temp_path /data/temp; | |
| 1120 | |
|
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parents:
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changeset
|
1121 alias /data/www/; |
| 1180 | 1122 } |
| 1123 </example> | |
| 1124 </para> | |
| 1125 | |
| 1126 </directive> | |
| 1127 | |
| 1128 | |
| 1129 <directive name="scgi_store_access"> | |
| 1130 <syntax><value>users</value>:<value>permissions</value> ...</syntax> | |
| 1131 <default>user:rw</default> | |
| 1132 <context>http</context> | |
| 1133 <context>server</context> | |
| 1134 <context>location</context> | |
| 1135 | |
| 1136 <para> | |
| 1137 Sets access permissions for newly created files and directories, e.g.: | |
| 1138 <example> | |
| 1139 scgi_store_access user:rw group:rw all:r; | |
| 1140 </example> | |
| 1141 </para> | |
| 1142 | |
| 1143 <para> | |
| 1144 If any <literal>group</literal> or <literal>all</literal> access permissions | |
| 1145 are specified then <literal>user</literal> permissions may be omitted: | |
| 1146 <example> | |
| 1147 scgi_store_access group:rw all:r; | |
| 1148 </example> | |
| 1149 </para> | |
| 1150 | |
| 1151 </directive> | |
| 1152 | |
| 1153 | |
| 1154 <directive name="scgi_temp_file_write_size"> | |
| 1155 <syntax><value>size</value></syntax> | |
| 1156 <default>8k|16k</default> | |
| 1157 <context>http</context> | |
| 1158 <context>server</context> | |
| 1159 <context>location</context> | |
| 1160 | |
| 1161 <para> | |
| 1162 Limits the <value>size</value> of data written to a temporary file | |
| 1163 at a time, when buffering of responses from the SCGI server | |
| 1164 to temporary files is enabled. | |
| 1165 By default, <value>size</value> is limited by two buffers set by the | |
| 1166 <link id="scgi_buffer_size"/> and <link id="scgi_buffers"/> directives. | |
| 1167 The maximum size of a temporary file is set by the | |
| 1168 <link id="scgi_max_temp_file_size"/> directive. | |
| 1169 </para> | |
| 1170 | |
| 1171 </directive> | |
| 1172 | |
| 1173 | |
| 1174 <directive name="scgi_temp_path"> | |
| 1175 <syntax> | |
| 1176 <value>path</value> | |
| 1177 [<value>level1</value> | |
| 1178 [<value>level2</value> | |
| 1179 [<value>level3</value>]]]</syntax> | |
| 1180 <default>scgi_temp</default> | |
| 1181 <context>http</context> | |
| 1182 <context>server</context> | |
| 1183 <context>location</context> | |
| 1184 | |
| 1185 <para> | |
| 1186 Defines a directory for storing temporary files | |
| 1187 with data received from SCGI servers. | |
| 1188 Up to three-level subdirectory hierarchy can be used underneath the specified | |
| 1189 directory. | |
| 1190 For example, in the following configuration | |
| 1191 <example> | |
| 1192 scgi_temp_path /spool/nginx/scgi_temp 1 2; | |
| 1193 </example> | |
| 1194 a temporary file might look like this: | |
| 1195 <example> | |
| 1196 /spool/nginx/scgi_temp/<emphasis>7</emphasis>/<emphasis>45</emphasis>/00000123<emphasis>457</emphasis> | |
| 1197 </example> | |
| 1198 </para> | |
| 1199 | |
| 1200 </directive> | |
| 1201 | |
| 1202 </section> | |
| 1203 | |
| 1204 </module> |