{"id":6534,"date":"2016-08-12T13:31:13","date_gmt":"2016-08-12T05:31:13","guid":{"rendered":"http:\/\/itmax.cn\/?p=6534"},"modified":"2016-08-12T13:31:13","modified_gmt":"2016-08-12T05:31:13","slug":"%e6%b5%8f%e8%a7%88%e5%99%a8-http-%e5%8d%8f%e8%ae%ae%e7%bc%93%e5%ad%98%e6%9c%ba%e5%88%b6%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=6534","title":{"rendered":"\u6d4f\u89c8\u5668 HTTP \u534f\u8bae\u7f13\u5b58\u673a\u5236\u8be6\u89e3"},"content":{"rendered":"

\u6700\u5728\u4f18\u5316\u670d\u52a1\u548c\u524d\u7aef\u7f13\u5b58\u5904\u7406\u4e0a\uff0c\u7ecf\u540c\u4e8b\u63a8\u8350\u4f7f\u7528\u4e86<\/span> etag<\/span>\uff0c\u540c\u65f6\u4e5f\u6df1\u5165\u4e86\u89e3\u4e86\u4e00\u4e0bHTTP \u534f\u8bae\u7f13\u5b58\u673a\u5236<\/span><\/p>\n

\u67e5\u4e86\u4e00\u4e9b\u8d44\u6599\u6574\u7406\u51fa\u6765\u4ee5\u5907\u5fd8\u3002<\/span><\/o:p><\/span><\/p>\n

1<\/span><\/strong>\u3001\u7f13\u5b58\u7684\u5206\u7c7b<\/span><\/strong><\/o:p><\/span><\/strong><\/p>\n

\u7f13\u5b58\u5206\u4e3a\u670d\u52a1\u7aef\u4fa7\uff08<\/span>server
\nside<\/span>\uff0c\u6bd4\u5982<\/span> Nginx<\/span>\u3001<\/span>Apache<\/span>\uff09\u548c\u5ba2\u6237\u7aef\u4fa7\uff08<\/span>client side<\/span>\uff0c\u6bd4\u5982<\/span> web browser<\/span>\uff09\u3002<\/span><\/o:p><\/span><\/p>\n

\u670d\u52a1\u7aef\u7f13\u5b58\u53c8\u5206\u4e3a<\/span> <\/span>\u4ee3\u7406\u670d\u52a1\u5668\u7f13\u5b58<\/span> <\/span>\u548c<\/span> <\/span>\u53cd\u5411\u4ee3\u7406\u670d\u52a1\u5668\u7f13\u5b58\uff08\u4e5f\u53eb\u7f51\u5173\u7f13\u5b58\uff0c\u6bd4\u5982<\/span> Nginx<\/span>\u53cd\u5411\u4ee3\u7406\u3001<\/span>Squid<\/span>\u7b49\uff09\uff0c\u5176\u5b9e\u5e7f\u6cdb\u4f7f\u7528\u7684<\/span> CDN <\/span>\u4e5f\u662f\u4e00\u79cd\u670d\u52a1\u7aef\u7f13\u5b58\uff0c\u76ee\u7684\u90fd\u662f\u8ba9\u7528\u6237\u7684\u8bf7\u6c42\u8d70<\/span>\u201d<\/span>\u6377\u5f84<\/span>\u201c<\/span>\uff0c\u5e76\u4e14\u90fd\u662f\u7f13\u5b58\u56fe\u7247\u3001\u6587\u4ef6\u7b49\u9759\u6001\u8d44\u6e90\u3002<\/span><\/o:p><\/span><\/p>\n

\u5ba2\u6237\u7aef\u4fa7\u7f13\u5b58\u4e00\u822c\u6307\u7684\u662f\u6d4f\u89c8\u5668\u7f13\u5b58\uff0c\u76ee\u7684\u5c31\u662f\u52a0\u901f\u5404\u79cd\u9759\u6001\u8d44\u6e90\u7684\u8bbf\u95ee\uff0c\u60f3\u60f3\u73b0\u5728\u7684\u5927\u578b\u7f51\u7ad9\uff0c\u968f\u4fbf\u4e00\u4e2a\u9875\u9762\u90fd\u662f\u4e00\u4e24\u767e\u4e2a\u8bf7\u6c42\uff0c\u6bcf\u5929<\/span> pv <\/span>\u90fd\u662f\u4ebf\u7ea7\u522b\uff0c\u5982\u679c\u6ca1\u6709\u7f13\u5b58\uff0c\u7528\u6237\u4f53\u9a8c\u4f1a\u6025\u5267\u4e0b\u964d\u3001\u540c\u65f6\u670d\u52a1\u5668\u538b\u529b\u548c\u7f51\u7edc\u5e26\u5bbd\u90fd\u9762\u4e34\u4e25\u91cd\u7684\u8003\u9a8c\u3002<\/span><\/o:p><\/span><\/p>\n

\"http:\/\/static.oschina.net\/uploads\/space\/2015\/0119\/013637_Rw3f_568818.jpg\"<\/span>

<\/o:p><\/span><\/p>\n

2<\/span><\/strong>\u3001\u6d4f\u89c8\u5668\u7f13\u5b58\u673a\u5236\u8be6\u89e3<\/span><\/strong><\/o:p><\/span><\/strong><\/p>\n

\u6d4f\u89c8\u5668\u7f13\u5b58\u63a7\u5236\u673a\u5236\u6709\u4e24\u79cd\uff1a<\/span>HTML
\nMeta<\/span>\u6807\u7b7e<\/span>vs. HTTP<\/span>\u5934\u4fe1\u606f<\/span><\/o:p><\/span><\/p>\n

2.1 HTML Meta<\/span><\/strong>\u6807\u7b7e\u63a7\u5236\u7f13\u5b58<\/span><\/strong><\/o:p><\/span><\/strong><\/p>\n

\u6d4f\u89c8\u5668\u7f13\u5b58\u673a\u5236\uff0c\u5176\u5b9e\u4e3b\u8981\u5c31\u662f<\/span>HTTP<\/span>\u534f\u8bae\u5b9a\u4e49\u7684\u7f13\u5b58\u673a\u5236\uff08\u5982\uff1a<\/span>Expires<\/span>\uff1b<\/span>Cache-control<\/span>\u7b49\uff09\u3002\u4f46\u662f\u4e5f\u6709\u975e<\/span>HTTP<\/span>\u534f\u8bae\u5b9a\u4e49\u7684\u7f13\u5b58\u673a\u5236\uff0c\u5982\u4f7f\u7528<\/span>HTML Meta <\/span>\u6807\u7b7e\uff0c<\/span>Web<\/span>\u5f00\u53d1\u8005\u53ef\u4ee5\u5728<\/span>HTML<\/span>\u9875\u9762\u7684<\/span><head><\/span>\u8282\u70b9\u4e2d\u52a0\u5165<\/span><meta><\/span>\u6807\u7b7e\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/span><\/o:p><\/span><\/p>\n

<<\/span>META<\/span> <\/span>HTTP-EQUIV<\/span>=<\/span>"Pragma"<\/span> <\/span>CONTENT<\/span>=<\/span>"no-cache"<\/span>><\/span><\/o:p><\/span><\/p>\n

\u4e0a\u8ff0\u4ee3\u7801\u7684\u4f5c\u7528\u662f\u544a\u8bc9\u6d4f\u89c8\u5668\u5f53\u524d\u9875\u9762\u4e0d\u88ab\u7f13\u5b58\uff0c\u6bcf\u6b21\u8bbf\u95ee\u90fd\u9700\u8981\u53bb\u670d\u52a1\u5668\u62c9\u53d6\u3002\u4f7f\u7528\u4e0a\u5f88\u7b80\u5355\uff0c\u4f46\u53ea\u6709\u90e8\u5206\u6d4f\u89c8\u5668\u53ef\u4ee5\u652f\u6301\uff0c\u800c\u4e14\u6240\u6709\u7f13\u5b58\u4ee3\u7406\u670d\u52a1\u5668\u90fd\u4e0d\u652f\u6301\uff0c\u56e0\u4e3a\u4ee3\u7406\u4e0d\u89e3\u6790<\/span>HTML<\/span>\u5185\u5bb9\u672c\u8eab\u3002\u800c\u5e7f\u6cdb\u5e94\u7528\u7684\u8fd8\u662f<\/span> HTTP<\/span>\u5934\u4fe1\u606f<\/span> <\/span>\u6765\u63a7\u5236\u7f13\u5b58\uff0c<\/span>\u4e0b\u9762\u6211\u4e3b\u8981\u4ecb\u7ecdHTTP<\/span>\u534f\u8bae\u5b9a\u4e49\u7684\u7f13\u5b58\u673a\u5236\u3002<\/span><\/o:p><\/span><\/p>\n

2.2 HTTP<\/span><\/strong>\u5934\u4fe1\u606f\u63a7\u5236\u7f13\u5b58<\/span><\/strong><\/o:p><\/span><\/strong><\/p>\n

2.2.1 <\/span><\/strong>\u6d4f\u89c8\u5668\u8bf7\u6c42\u6d41\u7a0b<\/span><\/strong><\/o:p><\/span><\/strong><\/p>\n

\u00b7        <\/span><\/span>\u6d4f\u89c8\u5668\u7b2c\u4e00\u6b21\u8bf7\u6c42\u6d41\u7a0b\u56fe\uff1a<\/span><\/o:p><\/span><\/p>\n

\"http:\/\/static.oschina.net\/uploads\/space\/2015\/0119\/015343_psx2_568818.png\"<\/span><\/o:p><\/span><\/p>\n

\u00b7        <\/span><\/span>\u6d4f\u89c8\u5668\u518d\u6b21\u8bf7\u6c42\u65f6\uff1a<\/span><\/o:p><\/span><\/p>\n

\"http:\/\/static.oschina.net\/uploads\/space\/2015\/0119\/015353_P04w_568818.png\"<\/span><\/o:p><\/span><\/p>\n

2.2.2 <\/span><\/strong>\u51e0\u4e2a\u91cd\u8981\u6982\u5ff5\u89e3\u91ca<\/span><\/strong><\/o:p><\/span><\/strong><\/p>\n

\u00b7        <\/span><\/span>Expires<\/span>\u7b56\u7565<\/span>\uff1aExpires<\/span>\u662fWeb<\/span>\u670d\u52a1\u5668\u54cd\u5e94\u6d88\u606f\u5934\u5b57\u6bb5\uff0c\u5728\u54cd\u5e94http<\/span>\u8bf7\u6c42\u65f6\u544a\u8bc9\u6d4f\u89c8\u5668\u5728\u8fc7\u671f\u65f6\u95f4\u524d\u6d4f\u89c8\u5668\u53ef\u4ee5\u76f4\u63a5\u4ece\u6d4f\u89c8\u5668\u7f13\u5b58\u53d6\u6570\u636e\uff0c\u800c\u65e0\u9700\u518d\u6b21\u8bf7\u6c42\u3002\u4e0d\u8fc7Expires <\/span>\u662fHTTP 1.0<\/span>\u7684\u4e1c\u897f\uff0c\u73b0\u5728\u9ed8\u8ba4\u6d4f\u89c8\u5668\u5747\u9ed8\u8ba4\u4f7f\u7528HTTP 1.1<\/span>\uff0c\u6240\u4ee5\u5b83\u7684\u4f5c\u7528\u57fa\u672c\u5ffd\u7565\u3002Expires <\/span>\u7684\u4e00\u4e2a\u7f3a\u70b9\u5c31\u662f\uff0c\u8fd4\u56de\u7684\u5230\u671f\u65f6\u95f4\u662f\u670d\u52a1\u5668\u7aef\u7684\u65f6\u95f4\uff0c\u8fd9\u6837\u5b58\u5728\u4e00\u4e2a\u95ee\u9898\uff0c\u5982\u679c\u5ba2\u6237\u7aef\u7684\u65f6\u95f4\u4e0e\u670d\u52a1\u5668\u7684\u65f6\u95f4\u76f8\u5dee\u5f88\u5927\uff08\u6bd4\u5982\u65f6\u949f\u4e0d\u540c\u6b65\uff0c\u6216\u8005\u8de8\u65f6\u533a\uff09\uff0c\u90a3\u4e48\u8bef\u5dee\u5c31\u5f88\u5927\uff0c\u6240\u4ee5\u5728HTTP 1.1<\/span>\u7248\u5f00\u59cb\uff0c\u4f7f\u7528Cache-Control: max-age=<\/span>\u79d2\u66ff\u4ee3\u3002<\/span><\/o:p><\/span><\/p>\n

\u00b7        <\/span><\/span>Cache-control<\/span>\u7b56\u7565\uff08\u91cd\u70b9\u5173\u6ce8\uff09<\/span>\uff1aCache-Control<\/span>\u4e0eExpires<\/span>\u7684\u4f5c\u7528\u4e00\u81f4\uff0c\u90fd\u662f\u6307\u660e\u5f53\u524d\u8d44\u6e90\u7684\u6709\u6548\u671f\uff0c\u63a7\u5236\u6d4f\u89c8\u5668\u662f\u5426\u76f4\u63a5\u4ece\u6d4f\u89c8\u5668\u7f13\u5b58\u53d6\u6570\u636e\u8fd8\u662f\u91cd\u65b0\u53d1\u8bf7\u6c42\u5230\u670d\u52a1\u5668\u53d6\u6570\u636e\u3002\u53ea\u4e0d\u8fc7Cache-Control<\/span>\u7684\u9009\u62e9\u66f4\u591a\uff0c\u8bbe\u7f6e\u66f4\u7ec6\u81f4\uff0c\u5982\u679c\u540c\u65f6\u8bbe\u7f6e\u7684\u8bdd\uff0c\u5176\u4f18\u5148\u7ea7\u9ad8\u4e8eExpires<\/span>\u3002<\/span><\/o:p><\/span><\/p>\n

\u503c\u53ef\u4ee5\u662fpublic<\/span>\u3001private<\/span>\u3001no-<\/span><\/span>cache<\/span>\u3001<\/span>no<\/span>– <\/span>store<\/span>\u3001<\/span>no<\/span>-transform<\/span>\u3001must-revalidate<\/span>\u3001proxy-revalidate<\/span>\u3001<\/span>max<\/span>-age<\/o:p><\/span><\/p>\n

\u5404\u4e2a\u6d88\u606f\u4e2d\u7684\u6307\u4ee4\u542b\u4e49\u5982\u4e0b\uff1a<\/o:p><\/span><\/span><\/p>\n

Public<\/span>\u6307\u793a\u54cd\u5e94\u53ef\u88ab\u4efb\u4f55\u7f13\u5b58\u533a\u7f13\u5b58\u3002<\/o:p><\/span><\/span><\/p>\n

Private<\/span>\u6307\u793a\u5bf9\u4e8e\u5355\u4e2a\u7528\u6237\u7684\u6574\u4e2a\u6216\u90e8\u5206\u54cd\u5e94\u6d88\u606f\uff0c\u4e0d\u80fd\u88ab\u5171\u4eab\u7f13\u5b58\u5904\u7406\u3002\u8fd9\u5141\u8bb8\u670d\u52a1\u5668\u4ec5\u4ec5\u63cf\u8ff0\u5f53\u7528\u6237\u7684\u90e8\u5206\u54cd\u5e94\u6d88\u606f\uff0c\u6b64\u54cd\u5e94\u6d88\u606f\u5bf9\u4e8e\u5176\u4ed6\u7528\u6237\u7684\u8bf7\u6c42\u65e0\u6548\u3002<\/o:p><\/span><\/span><\/p>\n

no<\/span>–<\/span>cache<\/span>\u6307\u793a\u8bf7\u6c42\u6216\u54cd\u5e94\u6d88\u606f\u4e0d\u80fd\u7f13\u5b58\uff0c\u8be5\u9009\u9879\u5e76\u4e0d\u662f\u8bf4\u53ef\u4ee5\u8bbe\u7f6e\u201d<\/span>\u4e0d\u7f13\u5b58\u201c<\/span>\uff0c\u5bb9\u6613\u671b\u6587\u751f\u4e49~<\/o:p><\/span><\/span><\/p>\n

no<\/span>–<\/span>store<\/span>\u7528\u4e8e\u9632\u6b62\u91cd\u8981\u7684\u4fe1\u606f\u88ab\u65e0\u610f\u7684\u53d1\u5e03\u3002\u5728\u8bf7\u6c42\u6d88\u606f\u4e2d\u53d1\u9001\u5c06\u4f7f\u5f97\u8bf7\u6c42\u548c\u54cd\u5e94\u6d88\u606f\u90fd\u4e0d\u4f7f\u7528\u7f13\u5b58\uff0c\u5b8c\u5168\u4e0d\u5b58\u4e0b\u4f86\u3002<\/o:p><\/span><\/span><\/p>\n

max<\/span>-age<\/span>\u6307\u793a\u5ba2\u6237\u673a\u53ef\u4ee5\u63a5\u6536\u751f\u5b58\u671f\u4e0d\u5927\u4e8e\u6307\u5b9a\u65f6\u95f4\uff08\u4ee5\u79d2\u4e3a\u5355\u4f4d\uff09\u7684\u54cd\u5e94\u3002<\/o:p><\/span><\/span><\/p>\n

min<\/span>–<\/span>fresh<\/span>\u6307\u793a\u5ba2\u6237\u673a\u53ef\u4ee5\u63a5\u6536\u54cd\u5e94\u65f6\u95f4\u5c0f\u4e8e\u5f53\u524d\u65f6\u95f4\u52a0\u4e0a\u6307\u5b9a\u65f6\u95f4\u7684\u54cd\u5e94\u3002<\/o:p><\/span><\/span><\/p>\n

max<\/span>-stale<\/span>\u6307\u793a\u5ba2\u6237\u673a\u53ef\u4ee5\u63a5\u6536\u8d85\u51fa\u8d85\u65f6\u671f\u95f4\u7684\u54cd\u5e94\u6d88\u606f\u3002\u5982\u679c\u6307\u5b9a<\/span>max<\/span>-stale<\/span>\u6d88\u606f\u7684\u503c\uff0c\u90a3\u4e48\u5ba2\u6237\u673a\u53ef\u4ee5\u63a5\u6536\u8d85\u51fa\u8d85\u65f6\u671f\u6307\u5b9a\u503c\u4e4b\u5185\u7684\u54cd\u5e94\u6d88\u606f\u3002<\/span><\/o:p><\/span><\/p>\n

\u00b7        <\/span><\/span>Last-Modified\/If-Modified-Since<\/span>\uff1a<\/span>Last-Modified\/If-Modified-Since<\/span>\u8981\u914d\u5408<\/span>Cache-Control<\/span>\u4f7f\u7528\u3002<\/span><\/o:p><\/span><\/p>\n

Last-Modified<\/span>\uff1a\u6807\u793a\u8fd9\u4e2a\u54cd\u5e94\u8d44\u6e90\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\u3002web<\/span>\u670d\u52a1\u5668\u5728\u54cd\u5e94\u8bf7\u6c42\u65f6\uff0c\u544a\u8bc9\u6d4f\u89c8\u5668\u8d44\u6e90\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\u3002<\/o:p><\/span><\/span><\/p>\n

If-Modified-Since<\/span>\uff1a\u5f53\u8d44\u6e90\u8fc7\u671f\u65f6\uff08\u4f7f\u7528<\/span>Cache<\/span>-Control<\/span>\u6807\u8bc6\u7684<\/span>max<\/span>-age<\/span>\uff09\uff0c\u53d1\u73b0\u8d44\u6e90\u5177\u6709<\/span>Last<\/span>-Modified<\/span>\u58f0\u660e\uff0c\u5219\u518d\u6b21\u5411web<\/span>\u670d\u52a1\u5668\u8bf7\u6c42\u65f6\u5e26\u4e0a\u5934 <\/span><\/span>If<\/span>-Modified-Since<\/span>\uff0c\u8868\u793a\u8bf7\u6c42\u65f6\u95f4\u3002web<\/span>\u670d\u52a1\u5668\u6536\u5230\u8bf7\u6c42\u540e\u53d1\u73b0\u6709\u5934<\/span>If<\/span>-Modified-Since <\/span>\u5219\u4e0e\u88ab\u8bf7\u6c42\u8d44\u6e90\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\u8fdb\u884c\u6bd4\u5bf9\u3002\u82e5\u6700\u540e\u4fee\u6539\u65f6\u95f4\u8f83\u65b0\uff0c\u8bf4\u660e\u8d44\u6e90\u53c8\u88ab\u6539\u52a8\u8fc7\uff0c\u5219\u54cd\u5e94\u6574\u7247\u8d44\u6e90\u5185\u5bb9\uff08\u5199\u5728\u54cd\u5e94\u6d88\u606f\u5305\u4f53\u5185\uff09\uff0c<\/span>HTTP<\/span> <\/span>200<\/span>\uff1b\u82e5\u6700\u540e\u4fee\u6539\u65f6\u95f4\u8f83\u65e7\uff0c\u8bf4\u660e\u8d44\u6e90\u65e0\u65b0\u4fee\u6539\uff0c\u5219\u54cd\u5e94<\/span>HTTP<\/span> <\/span>304<\/span> (<\/span>\u65e0\u9700\u5305\u4f53\uff0c\u8282\u7701\u6d4f\u89c8)<\/span>\uff0c\u544a\u77e5\u6d4f\u89c8\u5668\u7ee7\u7eed\u4f7f\u7528\u6240\u4fdd\u5b58\u7684<\/span>cache<\/span>\u3002<\/span><\/o:p><\/span><\/p>\n

\u00b7        <\/span><\/span>Etag\/If-None-Match<\/span>\uff1a<\/span>Etag\/If-None-Match<\/span>\u4e5f\u8981\u914d\u5408<\/span>Cache-Control<\/span>\u4f7f\u7528\u3002<\/span><\/o:p><\/span><\/p>\n

Etag<\/span>\uff1aweb<\/span>\u670d\u52a1\u5668\u54cd\u5e94\u8bf7\u6c42\u65f6\uff0c\u544a\u8bc9\u6d4f\u89c8\u5668\u5f53\u524d\u8d44\u6e90\u5728\u670d\u52a1\u5668\u7684\u552f\u4e00\u6807\u8bc6\uff08\u751f\u6210\u89c4\u5219\u7531\u670d\u52a1\u5668\u51b3\u5b9a\uff09\u3002Apache<\/span>\u4e2d\uff0cETag<\/span>\u7684\u503c\uff0c\u9ed8\u8ba4\u662f\u5bf9\u6587\u4ef6\u7684\u7d22\u5f15\u8282\uff08INode<\/span>\uff09\uff0c\u5927\u5c0f\uff08Size<\/span>\uff09\u548c\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff08MTime<\/span>\uff09\u8fdb\u884cHash<\/span>\u540e\u5f97\u5230\u7684\u3002<\/o:p><\/span><\/span><\/p>\n

If-None-Match<\/span>\uff1a\u5f53\u8d44\u6e90\u8fc7\u671f\u65f6\uff08\u4f7f\u7528<\/span>Cache<\/span>-Control<\/span>\u6807\u8bc6\u7684<\/span>max<\/span>-age<\/span>\uff09\uff0c\u53d1\u73b0\u8d44\u6e90\u5177\u6709Etage<\/span>\u58f0\u660e\uff0c\u5219\u518d\u6b21\u5411web<\/span>\u670d\u52a1\u5668\u8bf7\u6c42\u65f6\u5e26\u4e0a\u5934<\/span>If<\/span>–<\/span>None<\/span>–<\/span>Match<\/span> <\/span>\uff08Etag<\/span>\u7684\u503c\uff09\u3002web<\/span>\u670d\u52a1\u5668\u6536\u5230\u8bf7\u6c42\u540e\u53d1\u73b0\u6709\u5934<\/span>If<\/span>–<\/span>None<\/span>–<\/span>Match<\/span> <\/span>\u5219\u4e0e\u88ab\u8bf7\u6c42\u8d44\u6e90\u7684\u76f8\u5e94\u6821\u9a8c\u4e32\u8fdb\u884c\u6bd4\u5bf9\uff0c\u51b3\u5b9a\u8fd4\u56de<\/span>200<\/span>\u6216<\/span>304<\/span>\u3002<\/span><\/o:p><\/span><\/p>\n

\u00b7        <\/span><\/span>\u65e2\u751f<\/span>Last-Modified<\/span>\u4f55\u751f<\/span>Etag<\/span>\uff1f<\/span>\u4f60\u53ef\u80fd\u4f1a\u89c9\u5f97\u4f7f\u7528<\/span>Last-Modified<\/span>\u5df2\u7ecf\u8db3\u4ee5\u8ba9\u6d4f\u89c8\u5668\u77e5\u9053\u672c\u5730\u7684\u7f13\u5b58\u526f\u672c\u662f\u5426\u8db3\u591f\u65b0\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981<\/span>Etag<\/span>\uff08\u5b9e\u4f53\u6807\u8bc6\uff09\u5462\uff1f<\/span>HTTP1.1<\/span>\u4e2d<\/span>Etag<\/span>\u7684\u51fa\u73b0\u4e3b\u8981\u662f\u4e3a\u4e86\u89e3\u51b3\u51e0\u4e2a<\/span>Last-Modified<\/span>\u6bd4\u8f83\u96be\u89e3\u51b3\u7684\u95ee\u9898\uff1a<\/span><\/o:p><\/span><\/p>\n

Last-Modified<\/span>\u6807\u6ce8\u7684\u6700\u540e\u4fee\u6539\u53ea\u80fd\u7cbe\u786e\u5230\u79d2\u7ea7\uff0c\u5982\u679c\u67d0\u4e9b\u6587\u4ef6\u57281<\/span>\u79d2\u949f\u4ee5\u5185\uff0c\u88ab\u4fee\u6539\u591a\u6b21\u7684\u8bdd\uff0c\u5b83\u5c06\u4e0d\u80fd\u51c6\u786e\u6807\u6ce8\u6587\u4ef6\u7684\u4fee\u6539\u65f6\u95f4<\/o:p><\/span><\/span><\/p>\n

\u5982\u679c\u67d0\u4e9b\u6587\u4ef6\u4f1a\u88ab\u5b9a\u671f\u751f\u6210\uff0c\u5f53\u6709\u65f6\u5185\u5bb9\u5e76\u6ca1\u6709\u4efb\u4f55\u53d8\u5316\uff0c\u4f46Last-Modified<\/span>\u5374\u6539\u53d8\u4e86\uff0c\u5bfc\u81f4\u6587\u4ef6\u6ca1\u6cd5\u4f7f\u7528\u7f13\u5b58<\/o:p><\/span><\/span><\/p>\n

\u6709\u53ef\u80fd\u5b58\u5728\u670d\u52a1\u5668\u6ca1\u6709\u51c6\u786e\u83b7\u53d6\u6587\u4ef6\u4fee\u6539\u65f6\u95f4\uff0c\u6216\u8005\u4e0e\u4ee3\u7406\u670d\u52a1\u5668\u65f6\u95f4\u4e0d\u4e00\u81f4\u7b49\u60c5\u5f62<\/span><\/o:p><\/span><\/p>\n

Etag<\/span>\u662f\u670d\u52a1\u5668\u81ea\u52a8\u751f\u6210\u6216\u8005\u7531\u5f00\u53d1\u8005\u751f\u6210\u7684\u5bf9\u5e94\u8d44\u6e90\u5728\u670d\u52a1\u5668\u7aef\u7684\u552f\u4e00\u6807\u8bc6\u7b26\uff0c\u80fd\u591f\u66f4\u52a0\u51c6\u786e\u7684\u63a7\u5236\u7f13\u5b58\u3002<\/span>Last-Modified<\/span>\u4e0e<\/span>ETag<\/span>\u4e00\u8d77\u4f7f\u7528\u65f6\uff0c\u670d\u52a1\u5668\u4f1a\u4f18\u5148\u9a8c\u8bc1<\/span>ETag<\/span>\u3002<\/span><\/o:p><\/span><\/p>\n

\u00b7        <\/span><\/span>yahoo<\/span>\u7684Yslow<\/span>\u6cd5\u5219\u4e2d\u5219\u63d0\u793a\u8c28\u614e\u8bbe\u7f6eEtag<\/span><\/span>\uff1a\u9700\u8981\u6ce8\u610f\u7684\u662f\u5206\u5e03\u5f0f\u7cfb\u7edf\u91cc\u591a\u53f0\u673a\u5668\u95f4\u6587\u4ef6\u7684last-modified<\/span>\u5fc5\u987b\u4fdd\u6301\u4e00\u81f4\uff0c\u4ee5\u514d\u8d1f\u8f7d\u5747\u8861\u5230\u4e0d\u540c\u673a\u5668\u5bfc\u81f4\u6bd4\u5bf9\u5931\u8d25\uff0cYahoo<\/span>\u5efa\u8bae\u5206\u5e03\u5f0f\u7cfb\u7edf\u5c3d\u91cf\u5173\u95ed\u6389Etag(<\/span>\u6bcf\u53f0\u673a\u5668\u751f\u6210\u7684etag<\/span>\u90fd\u4f1a\u4e0d\u4e00\u6837\uff0c\u56e0\u4e3a\u9664\u4e86 last-modified<\/span>\u3001inode <\/span>\u4e5f\u5f88\u96be\u4fdd\u6301\u4e00\u81f4)<\/span>\u3002<\/span><\/o:p><\/span><\/p>\n

\u00b7        <\/span><\/span>Pragma<\/span>\u884c\u662f\u4e3a\u4e86\u517c\u5bb9HTTP1.0<\/span>\uff0c\u4f5c\u7528\u4e0eCache-Control:
\nno-cache<\/span>\u662f\u4e00\u6837\u7684\u3002<\/span><\/o:p><\/span><\/p>\n

\u00b7        <\/span><\/span>\u6700\u540e\u603b\u7ed3\u4e0b\u51e0\u79cd\u72b6\u6001\u7801\u7684\u533a\u522b<\/span>\uff1a<\/span><\/o:p><\/span><\/p>\n

\"http:\/\/static.oschina.net\/uploads\/space\/2015\/0119\/021903_6FjX_568818.jpg\"<\/span>

<\/o:p><\/span><\/p>\n

3<\/span><\/strong>\u3001\u7528\u6237\u884c\u4e3a\u4e0e\u7f13\u5b58<\/span><\/strong><\/o:p><\/span><\/strong><\/p>\n

\u6d4f\u89c8\u5668\u7f13\u5b58\u884c\u4e3a\u8fd8\u6709\u7528\u6237\u7684\u884c\u4e3a\u6709\u5173\uff0c\u5982\u679c\u5927\u5bb6\u5bf9<\/span> <\/span>\u5f3a\u5236\u5237\u65b0\uff08<\/span>Ctrl +
\nF5<\/span>\uff09<\/span> <\/span>\u8fd8\u6709\u5370\u8c61\u7684\u8bdd\u5e94\u8be5\u80fd\u7acb\u523b\u660e\u767d\u6211\u7684\u610f\u601d<\/span>~<\/o:p><\/span><\/p>\n\n\n\n\n\n\n\n\n\n
\n

\u7528\u6237\u64cd\u4f5c<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

Expires\/Cache-Control<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

Last-Modified\/Etag<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u5730\u5740\u680f\u56de\u8f66<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u6709\u6548<\/span><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u6709\u6548<\/span><\/o:p><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u9875\u9762\u94fe\u63a5\u8df3\u8f6c<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u6709\u6548<\/span><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u6709\u6548<\/span><\/o:p><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u65b0\u5f00\u7a97\u53e3<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u6709\u6548<\/span><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u6709\u6548<\/span><\/o:p><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u524d\u8fdb\u3001\u540e\u9000<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u6709\u6548<\/span><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u6709\u6548<\/span><\/o:p><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

F5\/<\/span><\/strong>\u6309\u94ae<\/span><\/strong>\u5237\u65b0<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u65e0\u6548<\/span><\/strong>(BR<\/span><\/strong>\u91cd\u7f6e<\/span><\/strong>max-age=0)<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u6709\u6548<\/span><\/o:p><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Ctrl+F5<\/span><\/strong>\u5237\u65b0<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u65e0\u6548\uff08\u91cd\u7f6e<\/span><\/strong>CC=no-cache<\/span><\/strong>\uff09<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n

\n

\u65e0\u6548\uff08\u8bf7\u6c42\u5934\u4e22\u5f03\u8be5\u9009\u9879\uff09<\/span><\/strong><\/o:p><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5177\u4f53\u8bf7\u53c2\u8003\u6587\u672b<\/span> Refer
\n[6]<\/o:p><\/span><\/p>\n

4<\/span><\/strong>\u3001<\/span><\/strong>Refer<\/span><\/strong>\uff1a<\/span><\/strong><\/o:p><\/span><\/strong><\/p>\n

[1] <\/span>\u6d4f\u89c8\u5668\u7f13\u5b58\u673a\u5236<\/span><\/o:p><\/span><\/p>\n

http:\/\/www.cnblogs.com\/skynet\/archive\/2012\/11\/28\/2792503.html<\/span><\/a><\/o:p><\/span><\/p>\n

[2] Web <\/span>\u5f00\u53d1\u4eba\u5458\u9700\u77e5\u7684<\/span> Web <\/span>\u7f13\u5b58\u77e5\u8bc6<\/span><\/o:p><\/span><\/p>\n

http:\/\/www.oschina.net\/news\/41397\/web-cache-knowledge<\/span><\/a><\/o:p><\/span><\/p>\n

[3] <\/span>\u6d4f\u89c8\u5668\u7f13\u5b58\u8be6\u89e3<\/span>:expires,cache-control,last-modified,etag<\/span>\u8be6\u7ec6\u8bf4\u660e<\/span><\/o:p><\/span><\/p>\n

http:\/\/blog.csdn.net\/eroswang\/article\/details\/8302191<\/span><\/a><\/o:p><\/span><\/p>\n

[4] <\/span>\u5728\u6d4f\u89c8\u5668\u5730\u5740\u680f\u6309\u56de\u8f66\u3001<\/span>F5<\/span>\u3001<\/span>Ctrl+F5<\/span>\u5237\u65b0\u7f51\u9875\u7684\u533a\u522b<\/span><\/o:p><\/span><\/p>\n

http:\/\/cloudbbs.org\/forum.php?mod=viewthread&tid=15790<\/span><\/a><\/o:p><\/span><\/p>\n

http:\/\/blog.csdn.net\/yui\/article\/details\/6584401<\/span><\/a><\/o:p><\/span><\/p>\n

[5] Cache Control <\/span>\u8207<\/span> ETag<\/span><\/o:p><\/span><\/p>\n

https:\/\/blog.othree.net\/log\/2012\/12\/22\/cache-control-and-etag\/<\/span><\/a><\/o:p><\/span><\/p>\n

[6] <\/span>\u7f13\u5b58\u7684\u6545\u4e8b<\/span><\/o:p><\/span><\/p>\n

http:\/\/segmentfault.com\/blog\/animabear\/1190000000375344<\/span><\/a><\/o:p><\/span><\/p>\n

[7] Google<\/span>\u7684<\/span>PageSpeed<\/span>\u7f51\u7ad9\u4f18\u5316\u7406\u8bba\u4e2d\u63d0\u5230\u4f7f\u7528<\/span>Etag<\/span>\u53ef\u4ee5\u51cf\u5c11\u670d\u52a1\u5668\u8d1f\u62c5<\/span><\/o:p><\/span><\/p>\n

https:\/\/developers.google.com\/speed\/docs\/pss\/AddEtags<\/span><\/a><\/span><\/o:p><\/span><\/p>\n

[8] yahoo<\/span>\u7684<\/span>Yslow<\/span>\u6cd5\u5219\u4e2d\u5219\u63d0\u793a\u8c28\u614e\u8bbe\u7f6e<\/span>Etag<\/span><\/o:p><\/span><\/p>\n

http:\/\/developer.yahoo.com\/performance\/rules.html#etags<\/span><\/a><\/span><\/o:p><\/span><\/p>\n

[9] H5 <\/span>\u7f13\u5b58\u673a\u5236\u6d45\u6790<\/span> <\/span>\u79fb\u52a8\u7aef<\/span> Web <\/span>\u52a0\u8f7d\u6027\u80fd\u4f18\u5316<\/span><\/o:p><\/span><\/p>\n

http:\/\/segmentfault.com\/a\/1190000004132566<\/span><\/a><\/o:p><\/span><\/p>\n

[10] <\/span>\u7f51\u9875\u6027\u80fd\uff1a<\/span> <\/span>\u7f13\u5b58\u6548\u7387\u5b9e\u8df5<\/span><\/o:p><\/span><\/p>\n

http:\/\/www.w3ctech.com\/topic\/1648<\/span><\/a><\/o:p><\/span><\/p>\n

[11] <\/span>\u900f\u8fc7\u6d4f\u89c8\u5668\u770b<\/span>HTTP<\/span>\u7f13\u5b58<\/span><\/o:p><\/span><\/p>\n

http:\/\/www.cnblogs.com\/skylar\/p\/browser-http-caching.html<\/span><\/a><\/o:p><\/span><\/p>\n

[12] <\/span>\u6d4f\u89c8\u5668\u7f13\u5b58\u77e5\u8bc6\u5c0f\u7ed3\u53ca\u5e94\u7528<\/span><\/o:p><\/span><\/p>\n

http:\/\/web.jobbole.com\/84888\/<\/span><\/a><\/o:p><\/span><\/p>\n

[13] <\/span>\u5927\u516c\u53f8\u91cc\u600e\u6837\u5f00\u53d1\u548c\u90e8\u7f72\u524d\u7aef\u4ee3\u7801\uff1f<\/span><\/o:p><\/span><\/p>\n

http:\/\/zhihu.com\/question\/20790576\/answer\/32602154?utm_campaign=webshare&utm_source=weibo&utm_medium=zhihu<\/span><\/a><\/o:p><\/span><\/p>\n

[14] <\/span>\u6d4f\u89c8\u5668\u7f13\u5b58\u673a\u5236\u8be6\u89e3<\/span><\/o:p><\/span><\/p>\n

https:\/\/mangguo.org\/browser-cache-mechanism-detailed\/<\/span><\/a><\/o:p><\/span><\/p>\n

\u00a9 <\/span>\u8457\u4f5c\u6743\u5f52\u4f5c\u8005\u6240\u6709<\/span><\/o:p><\/span><\/p>\n

 <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

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