{"id":57,"date":"2011-05-27T10:12:16","date_gmt":"2011-05-27T02:12:16","guid":{"rendered":"https:\/\/www.sulabs.net\/?p=57"},"modified":"2017-01-09T10:34:46","modified_gmt":"2017-01-09T02:34:46","slug":"%e6%ad%a3%e7%a1%ae%e4%bd%bf%e7%94%a8etag%e5%92%8cexpires%e6%a0%87%e8%af%86%e5%a4%84%e7%90%86%ef%bc%8c%e5%8f%af%e4%bb%a5%e4%bd%bf%e5%be%97%e9%a1%b5%e9%9d%a2%e6%9b%b4%e5%8a%a0%e6%9c%89%e6%95%88%e8%a2%ab","status":"publish","type":"post","link":"https:\/\/www.sulabs.net\/?p=57","title":{"rendered":"\u6b63\u786e\u4f7f\u7528Etag\u548cExpires\u6807\u8bc6\u5904\u7406\uff0c\u53ef\u4ee5\u4f7f\u5f97\u9875\u9762\u66f4\u52a0\u6709\u6548\u88abCache\u3002"},"content":{"rendered":"

\u5728\u5ba2\u6237\u7aef\u901a\u8fc7\u6d4f\u89c8\u5668\u53d1\u51fa\u7b2c\u4e00\u6b21\u8bf7\u6c42\u67d0\u4e00\u4e2aURL\u65f6\uff0c\u6839\u636e HTTP \u534f\u8bae\u7684\u89c4\u5b9a\uff0c\u6d4f\u89c8\u5668\u4f1a\u5411\u670d\u52a1\u5668\u4f20\u9001\u62a5\u5934(Http Request Header)\uff0c\u670d\u52a1\u5668\u7aef\u54cd\u5e94\u540c\u65f6\u8bb0\u5f55\u76f8\u5173\u5c5e\u6027\u6807\u8bb0(Http Reponse Header)\uff0c\u670d\u52a1\u5668\u7aef\u7684\u8fd4\u56de\u72b6\u6001\u4f1a\u662f200\uff0c\u683c\u5f0f\u7c7b\u4f3c\u5982\u4e0b\uff1a<\/p>\n

HTTP\/1.1 200 OK
\nDate: Tue, 03 Mar 2009 04:58:40 GMT
\nContent-Type: image\/jpeg
\nContent-Length: 83185
\nLast-Modified: Tue, 24 Feb 2009 08:01:04 GMT
\nCache-Control: max-age=2592000<\/p>\n

Expires: Thu, 02 Apr 2009 05:14:08 GMT
\nEtag: \u201c5d8c72a5edda8d6a:3239\u2033
\n\u5ba2\u6237\u7aef\u7b2c\u4e8c\u6b21\u8bf7\u6c42\u6b64URL\u65f6\uff0c\u6839\u636e HTTP \u534f\u8bae\u7684\u89c4\u5b9a\uff0c\u6d4f\u89c8\u5668\u4f1a\u5411\u670d\u52a1\u5668\u4f20\u9001\u62a5\u5934(Http Request Header)\uff0c\u670d\u52a1\u5668\u7aef\u54cd\u5e94\u5e76\u8bb0\u5f55\u76f8\u5173\u8bb0\u5f55\u5c5e\u6027\u6807\u8bb0\u6587\u4ef6\u6ca1\u6709\u53d1\u751f\u6539\u52a8,\u670d\u52a1\u5668\u7aef\u8fd4\u56de304\uff0c\u76f4\u63a5\u4ece\u7f13\u5b58\u4e2d\u8bfb\u53d6\uff1a<\/p>\n

HTTP\/1.x 304 Not Modified
\nDate: Tue, 03 Mar 2009 05:03:56 GMT
\nContent-Type: image\/jpeg
\nContent-Length: 83185
\nLast-Modified: Tue, 24 Feb 2009 08:01:04 GMT
\nCache-Control: max-age=2592000
\nExpires: Thu, 02 Apr 2009 05:14:08 GMT
\nEtag: \u201c5d8c72a5edda8d6a:3239\u2033<\/p>\n

\u5176\u4e2dLast-Modified\u3001Expires\u548cEtag\u662f\u6807\u8bb0\u9875\u9762\u7f13\u5b58\u6807\u8bc6<\/p>\n

\u4e00\u3001Last-Modified\u3001Expires\u548cEtag\u76f8\u5173\u5de5\u4f5c\u539f\u7406
\n1\u3001Last-Modified
\n\u5728\u6d4f\u89c8\u5668\u7b2c\u4e00\u6b21\u8bf7\u6c42\u67d0\u4e00\u4e2aURL\u65f6\uff0c\u670d\u52a1\u5668\u7aef\u7684\u8fd4\u56de\u72b6\u6001\u4f1a\u662f200\uff0c\u5185\u5bb9\u662f\u4f60\u8bf7\u6c42\u7684\u8d44\u6e90\uff0c\u540c\u65f6\u6709\u4e00\u4e2aLast-Modified\u7684\u5c5e\u6027\u6807\u8bb0(Http Reponse Header)\u6b64\u6587\u4ef6\u5728\u670d\u52a1\u671f\u7aef\u6700\u540e\u88ab\u4fee\u6539\u7684\u65f6\u95f4\uff0c\u683c\u5f0f\u7c7b\u4f3c\u8fd9\u6837\uff1a
\nLast-Modified: Tue, 24 Feb 2009 08:01:04 GMT
\n\u5ba2\u6237\u7aef\u7b2c\u4e8c\u6b21\u8bf7\u6c42\u6b64URL\u65f6\uff0c\u6839\u636e HTTP \u534f\u8bae\u7684\u89c4\u5b9a\uff0c\u6d4f\u89c8\u5668\u4f1a\u5411\u670d\u52a1\u5668\u4f20\u9001 If-Modified-Since \u62a5\u5934(Http Request Header)\uff0c\u8be2\u95ee\u8be5\u65f6\u95f4\u4e4b\u540e\u6587\u4ef6\u662f\u5426\u6709\u88ab\u4fee\u6539\u8fc7\uff1a
\nIf-Modified-Since: Tue, 24 Feb 2009 08:01:04 GMT
\n\u5982\u679c\u670d\u52a1\u5668\u7aef\u7684\u8d44\u6e90\u6ca1\u6709\u53d8\u5316\uff0c\u5219\u81ea\u52a8\u8fd4\u56de HTTP 304 \uff08NotChanged.\uff09\u72b6\u6001\u7801\uff0c\u5185\u5bb9\u4e3a\u7a7a\uff0c\u8fd9\u6837\u5c31\u8282\u7701\u4e86\u4f20\u8f93\u6570\u636e\u91cf\u3002\u5f53\u670d\u52a1\u5668\u7aef\u4ee3\u7801\u53d1\u751f\u6539\u53d8\u6216\u8005\u91cd\u542f\u670d\u52a1\u5668\u65f6\uff0c\u5219\u91cd\u65b0\u53d1\u51fa\u8d44\u6e90\uff0c\u8fd4\u56de\u548c\u7b2c\u4e00\u6b21\u8bf7\u6c42\u65f6\u7c7b\u4f3c\u3002\u4ece\u800c\u4fdd\u8bc1\u4e0d\u5411\u5ba2\u6237\u7aef\u91cd\u590d\u53d1\u51fa\u8d44\u6e90\uff0c\u4e5f\u4fdd\u8bc1\u5f53\u670d\u52a1\u5668\u6709\u53d8\u5316\u65f6\uff0c\u5ba2\u6237\u7aef\u80fd\u591f\u5f97\u5230\u6700\u65b0\u7684\u8d44\u6e90\u3002
\n\u6ce8\uff1a\u5982\u679cIf-Modified-Since\u7684\u65f6\u95f4\u6bd4\u670d\u52a1\u5668\u5f53\u524d\u65f6\u95f4(\u5f53\u524d\u7684\u8bf7\u6c42\u65f6\u95f4request_time)\u8fd8\u665a\uff0c\u4f1a\u8ba4\u4e3a\u662f\u4e2a\u975e\u6cd5\u8bf7\u6c42<\/p>\n

2\u3001Etag\u5de5\u4f5c\u539f\u7406
\nHTTP \u534f\u8bae\u89c4\u683c\u8bf4\u660e\u5b9a\u4e49ETag\u4e3a\u201c\u88ab\u8bf7\u6c42\u53d8\u91cf\u7684\u5b9e\u4f53\u6807\u8bb0\u201d \uff08\u53c2\u89c114.19\uff09\u3002\u7b80\u5355\u70b9\u5373\u670d\u52a1\u5668\u54cd\u5e94\u65f6\u7ed9\u8bf7\u6c42URL\u6807\u8bb0\uff0c\u5e76\u5728HTTP\u54cd\u5e94\u5934\u4e2d\u5c06\u5176\u4f20\u9001\u5230\u5ba2\u6237\u7aef\uff0c\u7c7b\u4f3c\u670d\u52a1\u5668\u7aef\u8fd4\u56de\u7684\u683c\u5f0f\uff1a
\nEtag: \u201c5d8c72a5edda8d6a:3239\u2033
\n\u5ba2\u6237\u7aef\u7684\u67e5\u8be2\u66f4\u65b0\u683c\u5f0f\u662f\u8fd9\u6837\u7684\uff1a
\nIf-None-Match: \u201c5d8c72a5edda8d6a:3239\u2033
\n\u5982\u679cETag\u6ca1\u6539\u53d8\uff0c\u5219\u8fd4\u56de\u72b6\u6001304\u3002
\n\u5373:\u5728\u5ba2\u6237\u7aef\u53d1\u51fa\u8bf7\u6c42\u540e\uff0cHttp Reponse Header\u4e2d\u5305\u542b Etag: \u201c5d8c72a5edda8d6a:3239\u2033
\n\u6807\u8bc6\uff0c\u7b49\u4e8e\u544a\u8bc9Client\u7aef\uff0c\u4f60\u62ff\u5230\u7684\u8fd9\u4e2a\u7684\u8d44\u6e90\u6709\u8868\u793aID\uff1a5d8c72a5edda8d6a:3239\u3002\u5f53\u4e0b\u6b21\u9700\u8981\u53d1Request\u7d22\u8981\u540c\u4e00\u4e2a URI\u7684\u65f6\u5019\uff0c\u6d4f\u89c8\u5668\u540c\u65f6\u53d1\u51fa\u4e00\u4e2aIf-None-Match\u62a5\u5934( Http RequestHeader)\u6b64\u65f6\u5305\u5934\u4e2d\u4fe1\u606f\u5305\u542b\u4e0a\u6b21\u8bbf\u95ee\u5f97\u5230\u7684Etag: \u201c5d8c72a5edda8d6a:3239\u2033\u6807\u8bc6\u3002
\nIf-None-Match: \u201c5d8c72a5edda8d6a:3239\u201c
\n,\u8fd9\u6837\uff0cClient\u7aef\u7b49\u4e8eCache\u4e86\u4e24\u4efd\uff0c\u670d\u52a1\u5668\u7aef\u5c31\u4f1a\u6bd4\u5bf92\u8005\u7684etag\u3002\u5982\u679cIf-None-Match\u4e3aFalse\uff0c\u4e0d\u8fd4\u56de200\uff0c\u8fd4\u56de304 (Not Modified) Response\u3002<\/p>\n

3\u3001Expires
\n\u7ed9\u51fa\u7684\u65e5\u671f\/\u65f6\u95f4\u540e\uff0c\u88ab\u54cd\u5e94\u8ba4\u4e3a\u662f\u8fc7\u65f6\u3002\u5982Expires: Thu, 02 Apr 2009 05:14:08 GMT
\n\u9700\u548cLast-Modified\u7ed3\u5408\u4f7f\u7528\u3002\u7528\u4e8e\u63a7\u5236\u8bf7\u6c42\u6587\u4ef6\u7684\u6709\u6548\u65f6\u95f4\uff0c\u5f53\u8bf7\u6c42\u6570\u636e\u5728\u6709\u6548\u671f\u5185\u65f6\u5ba2\u6237\u7aef\u6d4f\u89c8\u5668\u4ece\u7f13\u5b58\u8bf7\u6c42\u6570\u636e\u800c\u4e0d\u662f\u670d\u52a1\u5668\u7aef. \u5f53\u7f13\u5b58\u4e2d\u6570\u636e\u5931\u6548\u6216\u8fc7\u671f\uff0c\u624d\u51b3\u5b9a\u4ece\u670d\u52a1\u5668\u66f4\u65b0\u6570\u636e\u3002<\/p>\n

4\u3001Last-Modified\u548cExpires
\nLast-Modified\u6807\u8bc6\u80fd\u591f\u8282\u7701\u4e00\u70b9\u5e26\u5bbd\uff0c\u4f46\u662f\u8fd8\u662f\u9003\u4e0d\u6389\u53d1\u4e00\u4e2aHTTP\u8bf7\u6c42\u51fa\u53bb\uff0c\u800c\u4e14\u8981\u548cExpires\u4e00\u8d77\u7528\u3002\u800cExpires\u6807\u8bc6\u5374\u4f7f\u5f97\u6d4f\u89c8\u5668\u5e72\u8106\u8fdeHTTP\u8bf7\u6c42\u90fd\u4e0d\u7528\u53d1\uff0c\u6bd4\u5982\u5f53\u7528\u6237F5\u6216\u8005\u70b9\u51fbRefresh\u6309\u94ae\u7684\u65f6\u5019\u5c31\u7b97\u5bf9\u4e8e\u6709Expires\u7684URI\uff0c\u4e00\u6837\u4e5f\u4f1a\u53d1\u4e00\u4e2aHTTP\u8bf7\u6c42\u51fa\u53bb\uff0c\u6240\u4ee5\uff0cLast-Modified\u8fd8\u662f\u8981\u7528\u7684\uff0c\u800c \u4e14\u8981\u548cExpires\u4e00\u8d77\u7528\u3002<\/p>\n

5\u3001Etag\u548cExpires
\n\u5982\u679c\u670d\u52a1\u5668\u7aef\u540c\u65f6\u8bbe\u7f6e\u4e86Etag\u548cExpires\u65f6\uff0cEtag\u539f\u7406\u540c\u6837\uff0c\u5373\u4e0eLast-Modified\/Etag\u5bf9\u5e94\u7684HttpRequest Header:If-Modified-Since\u548cIf-None-Match\u3002\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd9\u4e24\u4e2aHeader\u7684\u503c\u548cWebServer\u53d1\u51fa\u7684 Last-Modified,Etag\u503c\u5b8c\u5168\u4e00\u6837\uff1b\u5728\u5b8c\u5168\u5339\u914dIf-Modified-Since\u548cIf-None-Match\u5373\u68c0\u67e5\u5b8c\u4fee\u6539\u65f6\u95f4\u548c Etag\u4e4b\u540e\uff0c\u670d\u52a1\u5668\u624d\u80fd\u8fd4\u56de304.<\/p>\n

6\u3001Last-Modified\u548cEtag
\nLast-Modified \u548cETags\u8bf7\u6c42\u7684http\u62a5\u5934\u4e00\u8d77\u4f7f\u7528\uff0c\u670d\u52a1\u5668\u9996\u5148\u4ea7\u751f Last-Modified\/Etag\u6807\u8bb0\uff0c\u670d\u52a1\u5668\u53ef\u5728\u7a0d\u540e\u4f7f\u7528\u5b83\u6765\u5224\u65ad\u9875\u9762\u662f\u5426\u5df2\u7ecf\u88ab\u4fee\u6539\uff0c\u6765\u51b3\u5b9a\u6587\u4ef6\u662f\u5426\u7ee7\u7eed\u7f13\u5b58
\n\u8fc7\u7a0b\u5982\u4e0b:
\n1. \u5ba2\u6237\u7aef\u8bf7\u6c42\u4e00\u4e2a\u9875\u9762\uff08A\uff09\u3002
\n2. \u670d\u52a1\u5668\u8fd4\u56de\u9875\u9762A\uff0c\u5e76\u5728\u7ed9A\u52a0\u4e0a\u4e00\u4e2aLast-Modified\/ETag\u3002
\n3. \u5ba2\u6237\u7aef\u5c55\u73b0\u8be5\u9875\u9762\uff0c\u5e76\u5c06\u9875\u9762\u8fde\u540cLast-Modified\/ETag\u4e00\u8d77\u7f13\u5b58\u3002
\n4. \u5ba2\u6237\u518d\u6b21\u8bf7\u6c42\u9875\u9762A\uff0c\u5e76\u5c06\u4e0a\u6b21\u8bf7\u6c42\u65f6\u670d\u52a1\u5668\u8fd4\u56de\u7684Last-Modified\/ETag\u4e00\u8d77\u4f20\u9012\u7ed9\u670d\u52a1\u5668\u3002
\n5. \u670d\u52a1\u5668\u68c0\u67e5\u8be5Last-Modified\u6216ETag\uff0c\u5e76\u5224\u65ad\u51fa\u8be5\u9875\u9762\u81ea\u4e0a\u6b21\u5ba2\u6237\u7aef\u8bf7\u6c42\u4e4b\u540e\u8fd8\u672a\u88ab\u4fee\u6539\uff0c\u76f4\u63a5\u8fd4\u56de\u54cd\u5e94304\u548c\u4e00\u4e2a\u7a7a\u7684\u54cd\u5e94\u4f53\u3002
\n\u6ce8\uff1a
\n1\u3001Last-Modified\u548cEtag\u5934\u90fd\u662f\u7531Web Server\u53d1\u51fa\u7684Http Reponse Header\uff0cWeb Server\u5e94\u8be5\u540c\u65f6\u652f\u6301\u8fd9\u4e24\u79cd\u5934\u3002
\n2\u3001Web Server\u53d1\u9001\u5b8cLast-Modified\/Etag\u5934\u7ed9\u5ba2\u6237\u7aef\u540e\uff0c\u5ba2\u6237\u7aef\u4f1a\u7f13\u5b58\u8fd9\u4e9b\u5934\uff1b
\n3\u3001\u5ba2\u6237\u7aef\u518d\u6b21\u53d1\u8d77\u76f8\u540c\u9875\u9762\u7684\u8bf7\u6c42\u65f6\uff0c\u5c06\u5206\u522b\u53d1\u9001\u4e0eLast-Modified\/Etag\u5bf9\u5e94\u7684Http RequestHeader:If-Modified-Since\u548cIf-None-Match\u3002\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd9\u4e24\u4e2aHeader\u7684\u503c\u548c WebServer\u53d1\u51fa\u7684Last-Modified,Etag\u503c\u5b8c\u5168\u4e00\u6837\uff1b
\n4\u3001\u901a\u8fc7\u4e0a\u8ff0\u503c\u5230\u670d\u52a1\u5668\u7aef\u68c0\u67e5\uff0c\u5224\u65ad\u6587\u4ef6\u662f\u5426\u7ee7\u7eed\u7f13\u5b58\uff1b<\/p>\n

\u4e8c\u3001Apache\u3001Lighttpd\u548cNginx\u4e2d\u9488\u914d\u7f6eEtag\u548cExpires\uff0c\u6709\u6548\u7f13\u5b58\u7eaf\u9759\u6001\u5982css\/js\/pic\/\u9875\u9762\/\u6d41\u5a92\u4f53\u7b49\u6587\u4ef6\u3002
\nA\u3001Expires
\nA.1\u3001Apache Etag
\n\u4f7f\u7528Apache\u7684mod_expires \u6a21\u5757\u6765\u8bbe\u7f6e\uff0c\u8fd9\u5305\u62ec\u63a7\u5236\u5e94\u7b54\u65f6\u7684Expires\u5934\u5185\u5bb9\u548cCache-Control\u5934\u7684max-age\u6307\u4ee4<\/p>\n

ExpiresActive On
\nExpiresByType image\/gif \u201caccess plus 1 month\u201d
\nExpiresByType image\/jpg \u201caccess plus 1 month\u201d
\nExpiresByType image\/jpeg \u201caccess plus 1 month\u201d
\nExpiresByType image\/x-icon \u201caccess plus 1 month\u201d
\nExpiresByType image\/bmp \u201caccess plus 1 month\u201d
\nExpiresByType image\/png \u201caccess plus 1 month\u201d
\nExpiresByType text\/html \u201caccess plus 30 minutes\u201d
\nExpiresByType text\/css\u00a0 \u201caccess plus 30 minutes\u201d
\nExpiresByType text\/txt\u00a0 \u201caccess plus 30 minutes\u201d
\nExpiresByType text\/js\u00a0\u00a0 \u201daccess plus 30 minutes\u201d
\nExpiresByType application\/x-javascript\u00a0\u00a0 \u201daccess plus 30 minutes\u201d
\nExpiresByType application\/x-shockwave-flash\u00a0\u00a0\u00a0\u00a0 \u201daccess plus 30 minutes\u201d
\n\u6216
\n<ifmodule mod_expires.c>
\n<filesmatch \u201c\\.(jpg|gif|png|css|js)$\u201d>
\nExpiresActive on
\nExpiresDefault \u201caccess plus 1 year\u201d
\n<\/filesmatch>
\n<\/ifmodule><\/p>\n

\u5f53\u8bbe\u7f6e\u4e86expires\u540e\uff0c\u4f1a\u81ea\u52a8\u8f93\u51faCache-Control \u7684max-age \u4fe1\u606f
\n\u5177\u4f53\u5173\u4e8e Expires \u8be6\u7ec6\u5185\u5bb9\u53ef\u4ee5\u67e5\u770bApache\u5b98\u65b9\u6587\u6863\u3002
\n\u5728\u8fd9\u4e2a\u65f6\u95f4\u6bb5\u91cc\uff0c\u8be5\u6587\u4ef6\u7684\u8bf7\u6c42\u90fd\u5c06\u76f4\u63a5\u901a\u8fc7\u7f13\u5b58\u670d\u52a1\u5668\u83b7\u53d6\uff0c
\n\u5f53\u7136\u5982\u679c\u9700\u8981\u5ffd\u7565\u6d4f\u89c8\u5668\u7684\u5237\u65b0\u8bf7\u6c42\uff08F5)\uff0c\u7f13\u5b58\u670d\u52a1\u5668squid\u8fd8\u9700\u8981\u4f7f\u7528 refresh_pattern \u9009\u9879\u6765\u5ffd\u7565\u8be5\u8bf7\u6c42<\/p>\n

refresh_pattern -i \\.gif$ 1440 100% 28800 ignore-reload
\nrefresh_pattern -i \\.jpg$ 1440 100% 28800 ignore-reload
\nrefresh_pattern -i \\.jpeg$ 1440 100% 28800 ignore-reload
\nrefresh_pattern -i \\.png$ 1440 100% 28800 ignore-reload
\nrefresh_pattern -i \\.bmp$ 1440 100% 28800 ignore-reload
\nrefresh_pattern -i \\.htm$ 60 100% 100 ignore-reload
\nrefresh_pattern -i \\.html$ 1440 50% 28800 ignore-reload
\nrefresh_pattern -i \\.xml$ 1440 50% 28800 ignore-reload
\nrefresh_pattern -i \\.txt$ 1440 50% 28800 ignore-reload
\nrefresh_pattern -i \\.css$ 1440 50% 28800 reload-into-ims
\nrefresh_pattern -i \\.js$ 60 50% 100 reload-into-ims
\nrefresh_pattern . 10 50% 60<\/p>\n

\u6709\u5173Squid\u4e2dExpires\u7684\u8bf4\u660e\uff0c\u8bf7\u53c2\u8003Squid\u5b98\u65b9\u4e2drefresh_pattern\u4ecb\u7ecd\u3002<\/p>\n

A.2\u3001Lighttpd Expires
\n\u548cApache\u4e00\u6837Lighttpd\u8bbe\u7f6eexpire\u4e5f\u8981\u5148\u67e5\u770b\u662f\u5426\u652f\u6301\u4e86mod_expire\u6a21\u5757\uff0c
\n\u4e0b\u9762\u7684\u8bbe\u7f6e\u662f\u8ba9URI\u4e2d\u6240\u6709images\u76ee\u5f55\u4e0b\u7684\u6587\u4ef61\u5c0f\u65f6\u540e\u8fc7\u671f\uff1b<\/p>\n

expire.url = ( \u201c\/images\/\u201d => \u201caccess 1 hours\u201d )<\/p>\n

\u4e0b\u9762\u662f\u8ba9\u4f5c\u7528\u4e8eimages\u76ee\u5f55\u53ca\u5176\u5b50\u76ee\u5f55\u7684\u6587\u4ef6\uff1b<\/p>\n

$HTTP[\"url\"] =~ \u201c^\/images\/\u201d {
\nexpire.url = ( \u201c\u201d => \u201caccess 1 hours\u201d )
\n}<\/p>\n

\u4e5f\u53ef\u4ee5\u6307\u5b9a\u6587\u4ef6\u7684\u7c7b\u578b\uff1b<\/p>\n

$HTTP[\"url\"] =~ \u201c\\.(jpg|gif|png|css|js)$\u201d {
\nexpire.url = ( \u201c\u201d => \u201caccess 1 hours\u201d )
\n}<\/p>\n

\u5177\u4f53\u53c2\u8003Lighttpd\u5b98\u65b9Expires\u89e3\u91ca<\/p>\n

A.3\u3001Nginx\u4e2dExpires<\/p>\n

location ~ .*\\.(gif|jpg|jpeg|png|bmp|swf)$
\n{
\nexpires 30d;
\n}
\nlocation ~ .*\\.(js|css)?$
\n{
\nexpires 1h;
\n}<\/p>\n

\u8fd9\u7c7b\u6587\u4ef6\u5e76\u4e0d\u5e38\u4fee\u6539\uff0c\u901a\u8fc7 expires \u6307\u4ee4\u6765\u63a7\u5236\u5176\u5728\u6d4f\u89c8\u5668\u7684\u7f13\u5b58\uff0c\u4ee5\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u8bf7\u6c42\u3002 expires \u6307\u4ee4\u53ef\u4ee5\u63a7\u5236 HTTP \u5e94\u7b54\u4e2d\u7684\u201c Expires \u201d\u548c\u201c Cache-Control \u201d\u7684\u5934\u6807\uff08\u8d77\u5230\u63a7\u5236\u9875\u9762\u7f13\u5b58\u7684\u4f5c\u7528\uff09\u3002\u5176\u4ed6\u8bf7\u53c2\u8003Nginx\u4e2dExpires<\/p>\n

B.1\u3001Apache\u4e2dEtag\u8bbe\u7f6e
\n\u5728Apache\u4e2d\u8bbe\u7f6eEtag\u7684\u652f\u6301\u6bd4\u8f83\u7b80\u5355\uff0c\u53ea\u7528\u5728\u542b\u6709\u9759\u6001\u6587\u4ef6\u7684\u76ee\u5f55\u4e2d\u5efa\u7acb\u4e00\u4e2a\u6587\u4ef6.htaccess, \u91cc\u9762\u52a0\u5165\uff1a<\/p>\n

FileETag MTime Size<\/p>\n

\u8fd9\u6837\u5c31\u884c\u4e86\uff0c\u8be6\u7ec6\u7684\u53ef\u4ee5\u53c2\u8003Apache\u7684FileEtag\u6587\u6863\u9875<\/p>\n

B.2\u3001Lighttpd Etag
\n\u5728Lighttpd\u4e2d\u8bbe\u7f6eEtag\u652f\u6301\uff1a
\netag.use-inode: \u662f\u5426\u4f7f\u7528inode\u4f5c\u4e3aEtag
\netag.use-mtime: \u662f\u5426\u4f7f\u7528\u6587\u4ef6\u4fee\u6539\u65f6\u95f4\u4f5c\u4e3aEtag
\netag.use-size: \u662f\u5426\u4f7f\u7528\u6587\u4ef6\u5927\u5c0f\u4f5c\u4e3aEtag
\nstatic-file.etags: \u662f\u5426\u542f\u7528Etag\u7684\u529f\u80fd
\n\u7b2c\u56db\u4e2a\u53c2\u6570\u80af\u5b9a\u662f\u8981enable\u7684\uff0c \u524d\u9762\u4e09\u4e2a\u5c31\u770b\u5b9e\u9645\u7684\u9700\u8981\u6765\u9009\u5427\uff0c\u63a8\u8350\u4f7f\u7528\u4fee\u6539\u65f6\u95f4<\/p>\n

B.3\u3001 Nginx Etag
\nNginx\u4e2d\u9ed8\u8ba4\u6ca1\u6709\u6dfb\u52a0\u5bf9Etag\u6807\u8bc6.Igor Sysoev\u7684\u89c2\u70b9\u201d\u5728\u5bf9\u9759\u6001\u6587\u4ef6\u5904\u7406\u4e0a\u770b\u4e0d\u51fa\u5982\u4f55Etag\u597d\u4e8eLast-Modified\u6807\u8bc6\u3002\u201d
\nNote:
\nYes, it\u2019s addition,and it\u2019s easy to add, however, I do not see howETag is better than Last-Modified for static files. -Igor Sysoev
\nA nice short description is here:<\/p>\n

http:\/\/www.mnot.net\/cache_docs\/#WORK<\/a><\/p>\n

It looks to me that it makes some caches out there to cache theresponse from the origin server more reliable as in rfc2616(ftp:\/\/ftp.rfc-editor.org\/in-notes\/rfc2616.txt)<\/a> is written.
\n3.11 Entity Tags 13.3.2 Entity Tag Cache Validators 14.19 ETag
\n\u5f53\u7136\u4e5f\u6709\u7b2c\u4e09\u65b9nginx-static-etags \u6a21\u5757\u4e86\uff0c\u8bf7\u53c2\u8003<\/p>\n

http:\/\/mikewest.org\/2008\/11\/generating-etags-for-static-content-using-nginx<\/a><\/p>\n

\u4e09\u3001\u5bf9\u4e8e\u975e\u5b9e\u65f6\u4ea4\u4e92\u52a8\u6001\u9875\u9762\u4e2dExpires\u548cEtag\u5904\u7406
\n\u5bf9\u6570\u636e\u66f4\u65b0\u5e76\u4e0d\u9891\u7e41\u3001\u5982tag\u5206\u7c7b\u5f52\u6863\u7b49\u7b49\uff0c\u53ef\u4ee5\u8003\u8651\u5bf9\u5176cache\u3002\u7b80\u5355\u70b9\u5c31\u662f\u5728\u975e\u5b9e\u65f6\u4ea4\u4e92\u7684\u52a8\u6001\u7a0b\u5e8f\u4e2d\u8f93\u51faexpires\u548cetag\u6807\u8bc6\uff0c\u8ba9\u5176\u7f13\u5b58\u3002\u4f46\u9700\u8981\u6ce8\u610f\u5173\u95edsession\uff0c\u9632\u6b62http response\u65f6http header\u5305\u542bsession id\u6807\u8bc6\uff1b
\n3.1\u3001Expires
\n\u5982expires.php<\/p>\n

<?php
\nheader(\u2019Cache-Control: max-age=86400,must-revalidate\u2019);
\nheader(\u2019Last-Modified: \u2018 .gmdate(\u2019D, d M Y H:i:s\u2019) . \u2018 GMT\u2019 );
\nheader(\u201dExpires: \u201d .gmdate (\u2019D, d M Y H:i:s\u2019, time() + \u201886400\u2032 ). \u2018 GMT\u2019);
\n?><\/p>\n

\u4ee5\u4e0a\u4fe1\u606f\u8868\u793a\u8be5\u6587\u4ef6\u81ea\u8bf7\u6c42\u540e24\u5c0f\u65f6\u540e\u8fc7\u671f\u3002
\n\u5176\u4ed6\u9700\u8981\u5904\u7406\u7684\u52a8\u6001\u9875\u9762\u76f4\u63a5\u8c03\u7528\u5373\u53ef\u3002
\n3.2\u3001Etag
\n\u6839\u636eHttp\u8fd4\u56de\u72b6\u6001\u6765\u5904\u7406\u3002\u5f53\u8fd4\u56de304\u76f4\u63a5\u4ece\u7f13\u5b58\u4e2d\u8bfb\u53d6
\n\u5982etag.php<\/p>\n

<?php
\ncache();
\necho date(\u201dY-m-d H:i:s\u201d);
\nfunction cache()
\n{
\n$etag = \u201chttp:\/\/longrujun.name\u201d;<\/a>
\nif ($_SERVER[\u2018HTTP_IF_NONE_MATCH\u2019] == $etag)
\n{
\nheader(\u2019Etag:\u2019.$etag,true,304);
\nexit;
\n}
\nelse header(\u2019Etag:\u2019.$etag);
\n}
\n?><\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728\u5ba2\u6237\u7aef\u901a\u8fc7\u6d4f\u89c8\u5668\u53d1\u51fa\u7b2c\u4e00\u6b21\u8bf7\u6c42\u67d0\u4e00\u4e2aURL\u65f6\uff0c\u6839\u636e HTTP \u534f\u8bae\u7684\u89c4\u5b9a\uff0c\u6d4f\u89c8 …<\/p>\n

\u7ee7\u7eed\u9605\u8bfb »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[12,13],"class_list":["post-57","post","type-post","status-publish","format-standard","hentry","category-lamp","tag-etag","tag-expires"],"_links":{"self":[{"href":"https:\/\/www.sulabs.net\/index.php?rest_route=\/wp\/v2\/posts\/57","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sulabs.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sulabs.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sulabs.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sulabs.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=57"}],"version-history":[{"count":4,"href":"https:\/\/www.sulabs.net\/index.php?rest_route=\/wp\/v2\/posts\/57\/revisions"}],"predecessor-version":[{"id":90,"href":"https:\/\/www.sulabs.net\/index.php?rest_route=\/wp\/v2\/posts\/57\/revisions\/90"}],"wp:attachment":[{"href":"https:\/\/www.sulabs.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=57"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sulabs.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=57"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sulabs.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=57"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}