\u5728\u5229\u7528httpwatch\u8fdb\u884c\u6293\u5305\u5206\u6790\u65f6\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u770b\u5230200\u3001301\u3001304\u8fd9\u51e0\u4e2a\u72b6\u6001\u7801\u3002\u5177\u672c\u4e09\u8005\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f<\/p>\n
200\u8868\u793a\u6b63\u5e380k\uff0c\u8fd9\u4e2a\u662f\u5730\u7403\u4eba\u90fd\u77e5\u9053\u7684\u4e86\u3002<\/p>\n
301 Moved Permanently \u8868\u793a\u5ba2\u6237\u8bf7\u6c42\u7684\u6587\u6863\u5728\u5176\u4ed6\u5730\u65b9\uff0c\u65b0\u7684URL\u5728Location\u5934\u4e2d\u7ed9\u51fa\uff0c\u6d4f\u89c8\u5668\u5e94\u8be5\u81ea\u52a8\u5730\u8bbf\u95ee\u65b0\u7684URL\u3002<\/p>\n
304 Not Modified\uff1a\u5ba2\u6237\u7aef\u6709\u7f13\u51b2\u7684\u6587\u4ef6\u5e76\u53d1\u51fa\u4e86\u4e00\u4e2a\u6761\u4ef6\u6027\u7684\u8bf7\u6c42\uff08\u4e00\u822c\u662f\u63d0\u4f9bIf-Modified-Since\u5934\u8868\u793a\u5ba2\u6237\u53ea\u60f3\u6bd4\u6307\u5b9a\u65e5\u671f\u66f4\u65b0\u7684\u6587\u6863\uff09\u3002\u670d\u52a1\u5668\u544a\u8bc9\u5ba2\u6237\uff0c\u539f\u6765\u7f13\u51b2\u7684\u6587\u6863\u8fd8\u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528\u3002<\/p>\n
\u5982\u679c\u5ba2\u6237\u7aef\u5728\u8bf7\u6c42\u4e00\u4e2a\u6587\u4ef6\u7684\u65f6\u5019\uff0c\u53d1\u73b0\u81ea\u5df1\u7f13\u5b58\u7684\u6587\u4ef6\u6709 Last Modified \uff0c\u90a3\u4e48\u5728\u8bf7\u6c42\u4e2d\u4f1a\u5305\u542b If Modified Since \uff0c\u8fd9\u4e2a\u65f6\u95f4\u5c31\u662f\u7f13\u5b58\u6587\u4ef6\u7684 Last Modified \u3002\u56e0\u6b64\uff0c\u5982\u679c\u8bf7\u6c42\u4e2d\u5305\u542b If Modified Since\uff0c\u5c31\u8bf4\u660e\u5df2\u7ecf\u6709\u7f13\u5b58\u5728\u5ba2\u6237\u7aef\u3002\u53ea\u8981\u5224\u65ad\u8fd9\u4e2a\u65f6\u95f4\u548c\u5f53\u524d\u8bf7\u6c42\u7684\u6587\u4ef6\u7684\u4fee\u6539\u65f6\u95f4\u5c31\u53ef\u4ee5\u786e\u5b9a\u662f\u8fd4\u56de 304 \u8fd8\u662f 200 \u3002\u5bf9\u4e8e\u9759\u6001\u6587\u4ef6\uff0c\u4f8b\u5982\uff1aCSS\u3001\u56fe\u7247\uff0c\u670d\u52a1\u5668\u4f1a\u81ea\u52a8\u5b8c\u6210 Last Modified \u548c If Modified Since \u7684\u6bd4\u8f83\uff0c\u5b8c\u6210\u7f13\u5b58\u6216\u8005\u66f4\u65b0\u3002\u4f46\u662f\u5bf9\u4e8e\u52a8\u6001\u9875\u9762\uff0c\u5c31\u662f\u52a8\u6001\u4ea7\u751f\u7684\u9875\u9762\uff0c\u5f80\u5f80\u6ca1\u6709\u5305\u542b Last Modified \u4fe1\u606f\uff0c\u8fd9\u6837\u6d4f\u89c8\u5668\u3001\u7f51\u5173\u7b49\u90fd\u4e0d\u4f1a\u505a\u7f13\u5b58\uff0c\u4e5f\u5c31\u662f\u5728\u6bcf\u6b21\u8bf7\u6c42\u7684\u65f6\u5019\u90fd\u5b8c\u6210\u4e00\u4e2a 200 \u7684\u8bf7\u6c42\u3002<\/p>\n
\u4e00\u822c\u7684\u5927\u7684\u7ad9\u70b9\u7684\u56fe\u7247\u670d\u52a1\u5668\u90fd\u6709\u5b9e\u73b0HTTP 304 \u7f13\u5b58\u529f\u80fd\u3002<\/p>\n
\u8fd9\u4e2a 304 \u72b6\u6001\u4e00\u822c\u4e3b\u8981\u5728\u7528\u6237\u5237\u65b0\u9875\u9762(F5\u952e)\u7684\u65f6\u5019\u89e6\u53d1\uff0c\u5f53\u7528\u6237\u5728\u5237\u65b0\u9875\u9762\u7684\u65f6\u5019\uff0c\u56e0\u4e3a\u539f\u6765\u7684\u9875\u9762\u91cc\u7684\u5f88\u591a\u56fe\u7247\u5df2\u7ecf\u7f13\u5b58\u8fc7\uff0c\u5ba2\u6237\u7aef\u7684\u6d4f\u89c8\u5668\u5df2\u7ecf\u8bb0\u5f55\u4e86\u56fe\u7247\u7684\u6700\u540e\u66f4\u65b0\u65f6\u95f4(Last Mod)\uff0c\u6240\u4ee5\u5728\u7528\u6237\u5237\u65b0\u9875\u9762\u7684\u65f6\u5019\uff0c\u4f1a\u5411\u670d\u52a1\u5668\u63d0\u4ea4\u4e00\u4e2a\u5b57\u6bb5\uff1aIf-Modified-Since: Wed, 08 Sep 2010 21:35:06 GMT<\/p>\n
\u8fd9\u4e2a\u65f6\u5019\uff0c\u670d\u52a1\u5668\u7aef\u7684\u7a0b\u5e8f\u5148\u53d6\u5f97\u8fd9\u4e2a\u5b57\u6bb5\u7684\u503c\uff0c\u7136\u540e\u4e0e\u670d\u52a1\u5668\u4e0a\u7684\u56fe\u7247\u6700\u540e\u4fee\u6539\u65f6\u95f4\u5bf9\u6bd4\uff0c\u5982\u679c\u76f8\u540c\uff0c\u5c31\u76f4\u63a5\u8fd4\u56de 304 Not Modified \uff0c\u7136\u540e\u505c\u6b62\u3002\u8fd9\u6837\u5c31\u4e0d\u7528\u628a\u56fe\u7247\u91cd\u65b0\u4f20\u8f93\u5230\u5ba2\u6237\u7aef\uff0c\u8fbe\u5230\u8282\u7701\u5e26\u5bbd\u7684\u76ee\u7684\u3002<\/p>\n
\u5173\u4e8e Cache-Control: max-age=\u79d2 \u548c Expires<\/p>\n
Expires = \u65f6\u95f4\uff0cHTTP 1.0 \u7248\u672c\uff0c\u7f13\u5b58\u7684\u8f7d\u6b62\u65f6\u95f4\uff0c\u5141\u8bb8\u5ba2\u6237\u7aef\u5728\u8fd9\u4e2a\u65f6\u95f4\u4e4b\u524d\u4e0d\u53bb\u68c0\u67e5\uff08\u53d1\u8bf7\u6c42\uff09
\nmax-age = \u79d2\uff0cHTTP 1.1\u7248\u672c\uff0c\u8d44\u6e90\u5728\u672c\u5730\u7f13\u5b58\u591a\u5c11\u79d2\u3002
\n\u5982\u679cmax-age\u548cExpires\u540c\u65f6\u5b58\u5728\uff0c\u5219\u88abCache-Control\u7684max-age\u8986\u76d6\u3002<\/p>\n
Expires \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\uff0c\u90a3\u4e48\u8bef\u5dee\u5c31\u5f88\u5927\uff0c\u6240\u4ee5\u5728HTTP 1.1\u7248\u5f00\u59cb\uff0c\u4f7f\u7528Cache-Control: max-age=\u79d2\u66ff\u4ee3\u3002<\/p>\n
<\/p>\n
\u6240\u6709\u72b6\u6001\u7801\u6c47\u603b\uff1a<\/p>\n
1xx\uff08\u4e34\u65f6\u54cd\u5e94\uff09
\n\u8868\u793a\u4e34\u65f6\u54cd\u5e94\u5e76\u9700\u8981\u8bf7\u6c42\u8005\u7ee7\u7eed\u6267\u884c\u64cd\u4f5c\u7684\u72b6\u6001\u4ee3\u7801\u3002<\/p>\n
\u4ee3\u7801 \u8bf4\u660e
\n100 \uff08\u7ee7\u7eed\uff09 \u8bf7\u6c42\u8005\u5e94\u5f53\u7ee7\u7eed\u63d0\u51fa\u8bf7\u6c42\u3002 \u670d\u52a1\u5668\u8fd4\u56de\u6b64\u4ee3\u7801\u8868\u793a\u5df2\u6536\u5230\u8bf7\u6c42\u7684\u7b2c\u4e00\u90e8\u5206\uff0c\u6b63\u5728\u7b49\u5f85\u5176\u4f59\u90e8\u5206\u3002
\n101 \uff08\u5207\u6362\u534f\u8bae\uff09 \u8bf7\u6c42\u8005\u5df2\u8981\u6c42\u670d\u52a1\u5668\u5207\u6362\u534f\u8bae\uff0c\u670d\u52a1\u5668\u5df2\u786e\u8ba4\u5e76\u51c6\u5907\u5207\u6362\u3002<\/p>\n
2xx \uff08\u6210\u529f\uff09
\n\u8868\u793a\u6210\u529f\u5904\u7406\u4e86\u8bf7\u6c42\u7684\u72b6\u6001\u4ee3\u7801\u3002
\n\u4ee3\u7801 \u8bf4\u660e
\n200 \uff08\u6210\u529f\uff09 \u670d\u52a1\u5668\u5df2\u6210\u529f\u5904\u7406\u4e86\u8bf7\u6c42\u3002 \u901a\u5e38\uff0c\u8fd9\u8868\u793a\u670d\u52a1\u5668\u63d0\u4f9b\u4e86\u8bf7\u6c42\u7684\u7f51\u9875\u3002
\n201 \uff08\u5df2\u521b\u5efa\uff09 \u8bf7\u6c42\u6210\u529f\u5e76\u4e14\u670d\u52a1\u5668\u521b\u5efa\u4e86\u65b0\u7684\u8d44\u6e90\u3002
\n202 \uff08\u5df2\u63a5\u53d7\uff09 \u670d\u52a1\u5668\u5df2\u63a5\u53d7\u8bf7\u6c42\uff0c\u4f46\u5c1a\u672a\u5904\u7406\u3002
\n203 \uff08\u975e\u6388\u6743\u4fe1\u606f\uff09 \u670d\u52a1\u5668\u5df2\u6210\u529f\u5904\u7406\u4e86\u8bf7\u6c42\uff0c\u4f46\u8fd4\u56de\u7684\u4fe1\u606f\u53ef\u80fd\u6765\u81ea\u53e6\u4e00\u6765\u6e90\u3002
\n204 \uff08\u65e0\u5185\u5bb9\uff09 \u670d\u52a1\u5668\u6210\u529f\u5904\u7406\u4e86\u8bf7\u6c42\uff0c\u4f46\u6ca1\u6709\u8fd4\u56de\u4efb\u4f55\u5185\u5bb9\u3002
\n205 \uff08\u91cd\u7f6e\u5185\u5bb9\uff09 \u670d\u52a1\u5668\u6210\u529f\u5904\u7406\u4e86\u8bf7\u6c42\uff0c\u4f46\u6ca1\u6709\u8fd4\u56de\u4efb\u4f55\u5185\u5bb9\u3002
\n206 \uff08\u90e8\u5206\u5185\u5bb9\uff09 \u670d\u52a1\u5668\u6210\u529f\u5904\u7406\u4e86\u90e8\u5206 GET \u8bf7\u6c42\u3002<\/p>\n
3xx \uff08\u91cd\u5b9a\u5411\uff09
\n\u8868\u793a\u8981\u5b8c\u6210\u8bf7\u6c42\uff0c\u9700\u8981\u8fdb\u4e00\u6b65\u64cd\u4f5c\u3002 \u901a\u5e38\uff0c\u8fd9\u4e9b\u72b6\u6001\u4ee3\u7801\u7528\u6765\u91cd\u5b9a\u5411\u3002<\/p>\n
\u4ee3\u7801 \u8bf4\u660e
\n300 \uff08\u591a\u79cd\u9009\u62e9\uff09 \u9488\u5bf9\u8bf7\u6c42\uff0c\u670d\u52a1\u5668\u53ef\u6267\u884c\u591a\u79cd\u64cd\u4f5c\u3002 \u670d\u52a1\u5668\u53ef\u6839\u636e\u8bf7\u6c42\u8005 (user agent) \u9009\u62e9\u4e00\u9879\u64cd\u4f5c\uff0c\u6216\u63d0\u4f9b\u64cd\u4f5c\u5217\u8868\u4f9b\u8bf7\u6c42\u8005\u9009\u62e9\u3002
\n301 \uff08\u6c38\u4e45\u79fb\u52a8\uff09 \u8bf7\u6c42\u7684\u7f51\u9875\u5df2\u6c38\u4e45\u79fb\u52a8\u5230\u65b0\u4f4d\u7f6e\u3002 \u670d\u52a1\u5668\u8fd4\u56de\u6b64\u54cd\u5e94\uff08\u5bf9 GET \u6216 HEAD \u8bf7\u6c42\u7684\u54cd\u5e94\uff09\u65f6\uff0c\u4f1a\u81ea\u52a8\u5c06\u8bf7\u6c42\u8005\u8f6c\u5230\u65b0\u4f4d\u7f6e\u3002
\n302 \uff08\u4e34\u65f6\u79fb\u52a8\uff09 \u670d\u52a1\u5668\u76ee\u524d\u4ece\u4e0d\u540c\u4f4d\u7f6e\u7684\u7f51\u9875\u54cd\u5e94\u8bf7\u6c42\uff0c\u4f46\u8bf7\u6c42\u8005\u5e94\u7ee7\u7eed\u4f7f\u7528\u539f\u6709\u4f4d\u7f6e\u6765\u8fdb\u884c\u4ee5\u540e\u7684\u8bf7\u6c42\u3002
\n303 \uff08\u67e5\u770b\u5176\u4ed6\u4f4d\u7f6e\uff09 \u8bf7\u6c42\u8005\u5e94\u5f53\u5bf9\u4e0d\u540c\u7684\u4f4d\u7f6e\u4f7f\u7528\u5355\u72ec\u7684 GET \u8bf7\u6c42\u6765\u68c0\u7d22\u54cd\u5e94\u65f6\uff0c\u670d\u52a1\u5668\u8fd4\u56de\u6b64\u4ee3\u7801\u3002
\n304 \uff08\u672a\u4fee\u6539\uff09 \u81ea\u4ece\u4e0a\u6b21\u8bf7\u6c42\u540e\uff0c\u8bf7\u6c42\u7684\u7f51\u9875\u672a\u4fee\u6539\u8fc7\u3002 \u670d\u52a1\u5668\u8fd4\u56de\u6b64\u54cd\u5e94\u65f6\uff0c\u4e0d\u4f1a\u8fd4\u56de\u7f51\u9875\u5185\u5bb9\u3002
\n305 \uff08\u4f7f\u7528\u4ee3\u7406\uff09 \u8bf7\u6c42\u8005\u53ea\u80fd\u4f7f\u7528\u4ee3\u7406\u8bbf\u95ee\u8bf7\u6c42\u7684\u7f51\u9875\u3002 \u5982\u679c\u670d\u52a1\u5668\u8fd4\u56de\u6b64\u54cd\u5e94\uff0c\u8fd8\u8868\u793a\u8bf7\u6c42\u8005\u5e94\u4f7f\u7528\u4ee3\u7406\u3002
\n307 \uff08\u4e34\u65f6\u91cd\u5b9a\u5411\uff09 \u670d\u52a1\u5668\u76ee\u524d\u4ece\u4e0d\u540c\u4f4d\u7f6e\u7684\u7f51\u9875\u54cd\u5e94\u8bf7\u6c42\uff0c\u4f46\u8bf7\u6c42\u8005\u5e94\u7ee7\u7eed\u4f7f\u7528\u539f\u6709\u4f4d\u7f6e\u6765\u8fdb\u884c\u4ee5\u540e\u7684\u8bf7\u6c42\u3002<\/p>\n
4xx\uff08\u8bf7\u6c42\u9519\u8bef\uff09
\n\u8fd9\u4e9b\u72b6\u6001\u4ee3\u7801\u8868\u793a\u8bf7\u6c42\u53ef\u80fd\u51fa\u9519\uff0c\u59a8\u788d\u4e86\u670d\u52a1\u5668\u7684\u5904\u7406\u3002<\/p>\n
\u4ee3\u7801 \u8bf4\u660e
\n400 \uff08\u9519\u8bef\u8bf7\u6c42\uff09 \u670d\u52a1\u5668\u4e0d\u7406\u89e3\u8bf7\u6c42\u7684\u8bed\u6cd5\u3002
\n401 \uff08\u672a\u6388\u6743\uff09 \u8bf7\u6c42\u8981\u6c42\u8eab\u4efd\u9a8c\u8bc1\u3002 \u5bf9\u4e8e\u9700\u8981\u767b\u5f55\u7684\u7f51\u9875\uff0c\u670d\u52a1\u5668\u53ef\u80fd\u8fd4\u56de\u6b64\u54cd\u5e94\u3002
\n403 \uff08\u7981\u6b62\uff09 \u670d\u52a1\u5668\u62d2\u7edd\u8bf7\u6c42\u3002
\n404 \uff08\u672a\u627e\u5230\uff09 \u670d\u52a1\u5668\u627e\u4e0d\u5230\u8bf7\u6c42\u7684\u7f51\u9875\u3002
\n405 \uff08\u65b9\u6cd5\u7981\u7528\uff09 \u7981\u7528\u8bf7\u6c42\u4e2d\u6307\u5b9a\u7684\u65b9\u6cd5\u3002
\n406 \uff08\u4e0d\u63a5\u53d7\uff09 \u65e0\u6cd5\u4f7f\u7528\u8bf7\u6c42\u7684\u5185\u5bb9\u7279\u6027\u54cd\u5e94\u8bf7\u6c42\u7684\u7f51\u9875\u3002
\n407 \uff08\u9700\u8981\u4ee3\u7406\u6388\u6743\uff09 \u6b64\u72b6\u6001\u4ee3\u7801\u4e0e 401\uff08\u672a\u6388\u6743\uff09\u7c7b\u4f3c\uff0c\u4f46\u6307\u5b9a\u8bf7\u6c42\u8005\u5e94\u5f53\u6388\u6743\u4f7f\u7528\u4ee3\u7406\u3002
\n408 \uff08\u8bf7\u6c42\u8d85\u65f6\uff09 \u670d\u52a1\u5668\u7b49\u5019\u8bf7\u6c42\u65f6\u53d1\u751f\u8d85\u65f6\u3002
\n409 \uff08\u51b2\u7a81\uff09 \u670d\u52a1\u5668\u5728\u5b8c\u6210\u8bf7\u6c42\u65f6\u53d1\u751f\u51b2\u7a81\u3002 \u670d\u52a1\u5668\u5fc5\u987b\u5728\u54cd\u5e94\u4e2d\u5305\u542b\u6709\u5173\u51b2\u7a81\u7684\u4fe1\u606f\u3002
\n410 \uff08\u5df2\u5220\u9664\uff09 \u5982\u679c\u8bf7\u6c42\u7684\u8d44\u6e90\u5df2\u6c38\u4e45\u5220\u9664\uff0c\u670d\u52a1\u5668\u5c31\u4f1a\u8fd4\u56de\u6b64\u54cd\u5e94\u3002
\n411 \uff08\u9700\u8981\u6709\u6548\u957f\u5ea6\uff09 \u670d\u52a1\u5668\u4e0d\u63a5\u53d7\u4e0d\u542b\u6709\u6548\u5185\u5bb9\u957f\u5ea6\u6807\u5934\u5b57\u6bb5\u7684\u8bf7\u6c42\u3002
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