{"id":353,"date":"2018-08-13T23:33:04","date_gmt":"2018-08-13T15:33:04","guid":{"rendered":"https:\/\/www.myway5.com\/?p=353"},"modified":"2023-07-05T21:47:15","modified_gmt":"2023-07-05T13:47:15","slug":"http-cache-control","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2018\/08\/13\/http-cache-control\/","title":{"rendered":"HTTP\u534f\u8bae\u4e2d\u7684\u7f13\u5b58\u63a7\u5236"},"content":{"rendered":"<h2>\u4e00\u3001\u603b\u89c8<\/h2>\n<p>HTTP\u534f\u8bae\u4e2d\u6709\u4ee5\u4e0b\u7684\u5934\u90e8\u5b57\u6bb5\u548c\u7f13\u5b58\u76f8\u5173\uff08\u5f88\u591a\u5185\u5bb9\u90fd\u662f\u590d\u5236\u7684MDN\u7684\u6587\u6863\uff09<\/p>\n<table>\n<thead>\n<tr>\n<th>\u5b57\u6bb5\u540d<\/th>\n<th>\u8bf7\u6c42\u5934\u5305\u542b<\/th>\n<th>\u54cd\u5e94\u5934\u5305\u542b<\/th>\n<th>\u542b\u4e49<\/th>\n<th>\u51fa\u73b0\u7684\u534f\u8bae\u7248\u672c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Cache-Control<\/td>\n<td>\u662f<\/td>\n<td>\u662f<\/td>\n<td>\u662f\u5426\u7f13\u5b58\u3001\u7f13\u5b58\u65f6\u95f4\u3001\u7f13\u5b58\u9a8c\u8bc1\u7b49<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>Pragma<\/td>\n<td>\u662f<\/td>\n<td>\u662f<\/td>\n<td>\u53ea\u6709\u4e00\u79cd\u7528\u6cd5\uff1aPragma: no-cache\u3002\u5728\u54cd\u5e94\u5934\u4e2d\u6ca1\u6709\u89c4\u5b9a<\/td>\n<td>HTTP\/1.0<\/td>\n<\/tr>\n<tr>\n<td>Vary<\/td>\n<td>\u5426<\/td>\n<td>\u662f<\/td>\n<td>\u5b83\u51b3\u5b9a\u4e86\u5bf9\u4e8e\u672a\u6765\u7684\u4e00\u4e2a\u8bf7\u6c42\u5934\uff0c\u5e94\u8be5\u7528\u4e00\u4e2a\u7f13\u5b58\u7684\u56de\u590d(response)\u8fd8\u662f\u5411\u6e90\u670d\u52a1\u5668\u8bf7\u6c42\u4e00\u4e2a\u65b0\u7684\u56de\u590d<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>If-Match<\/td>\n<td>\u662f<\/td>\n<td>\u5426<\/td>\n<td>\u5728\u8bf7\u6c42\u65b9\u6cd5\u4e3a GET \u548c HEAD \u7684\u60c5\u51b5\u4e0b\uff0c\u670d\u52a1\u5668\u4ec5\u5728\u8bf7\u6c42\u7684\u8d44\u6e90\u6ee1\u8db3\u6b64\u9996\u90e8\u5217\u51fa\u7684 ETag \u4e4b\u4e00\u65f6\u624d\u4f1a\u8fd4\u56de\u8d44\u6e90\u3002\u800c\u5bf9\u4e8e PUT \u6216\u5176\u4ed6\u975e\u5b89\u5168\u65b9\u6cd5\u6765\u8bf4\uff0c\u53ea\u6709\u5728\u6ee1\u8db3\u6761\u4ef6\u7684\u60c5\u51b5\u4e0b\u624d\u53ef\u4ee5\u5c06\u8d44\u6e90\u4e0a\u4f20<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>If-None-Match<\/td>\n<td>\u662f<\/td>\n<td>\u5426<\/td>\n<td>\u5bf9\u4e8e GET \u548c HEAD \u8bf7\u6c42\u65b9\u6cd5\u6765\u8bf4\uff0c\u5f53\u4e14\u4ec5\u5f53\u670d\u52a1\u5668\u4e0a\u6ca1\u6709\u4efb\u4f55\u8d44\u6e90\u7684 ETag \u5c5e\u6027\u503c\u4e0e\u8fd9\u4e2a\u9996\u90e8\u4e2d\u5217\u51fa\u7684\u76f8\u5339\u914d\u7684\u65f6\u5019\uff0c\u670d\u52a1\u5668\u7aef\u4f1a\u624d\u8fd4\u56de\u6240\u8bf7\u6c42\u7684\u8d44\u6e90\uff0c\u54cd\u5e94\u7801\u4e3a  200  \u3002\u5bf9\u4e8e\u5176\u4ed6\u65b9\u6cd5\u6765\u8bf4\uff0c\u5f53\u4e14\u4ec5\u5f53\u6700\u7ec8\u786e\u8ba4\u6ca1\u6709\u5df2\u5b58\u5728\u7684\u8d44\u6e90\u7684  ETag \u5c5e\u6027\u503c\u4e0e\u8fd9\u4e2a\u9996\u90e8\u4e2d\u6240\u5217\u51fa\u7684\u76f8\u5339\u914d\u7684\u65f6\u5019\uff0c\u624d\u4f1a\u5bf9\u8bf7\u6c42\u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406\u3002<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>If-Modified-Since<\/td>\n<td>\u662f<\/td>\n<td>\u5426<\/td>\n<td>\u670d\u52a1\u5668\u53ea\u5728\u6240\u8bf7\u6c42\u7684\u8d44\u6e90\u5728\u7ed9\u5b9a\u7684\u65e5\u671f\u65f6\u95f4\u4e4b\u540e\u5bf9\u5185\u5bb9\u8fdb\u884c\u8fc7\u4fee\u6539\u7684\u60c5\u51b5\u4e0b\u624d\u4f1a\u5c06\u8d44\u6e90\u8fd4\u56de\uff0c\u72b6\u6001\u7801\u4e3a200\u3002\u5982\u679c\u8bf7\u6c42\u7684\u8d44\u6e90\u4ece\u90a3\u65f6\u8d77\u672a\u7ecf\u4fee\u6539\uff0c\u90a3\u4e48\u8fd4\u56de\u4e00\u4e2a\u4e0d\u5e26\u6709\u6d88\u606f\u4e3b\u4f53\u7684304\u54cd\u5e94\uff0c\u800c\u5728 Last-Modified \u9996\u90e8\u4e2d\u4f1a\u5e26\u6709\u4e0a\u6b21\u4fee\u6539\u65f6\u95f4\u3002\u4e0d\u540c\u4e8eIf-Unmodified-Since, If-Modified-Since \u53ea\u53ef\u4ee5\u7528\u5728 GET \u6216 HEAD \u8bf7\u6c42\u4e2d\u3002<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>If-Unmodified-Since<\/td>\n<td>\u662f<\/td>\n<td>\u5426<\/td>\n<td>\u53ea\u6709\u5f53\u8d44\u6e90\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u4e4b\u540e\u6ca1\u6709\u8fdb\u884c\u8fc7\u4fee\u6539\u7684\u60c5\u51b5\u4e0b\uff0c\u670d\u52a1\u5668\u624d\u4f1a\u8fd4\u56de\u8bf7\u6c42\u7684\u8d44\u6e90\uff0c\u6216\u662f\u63a5\u53d7 POST \u6216\u5176\u4ed6 non-safe \u65b9\u6cd5\u7684\u8bf7\u6c42\u3002\u5982\u679c\u6240\u8bf7\u6c42\u7684\u8d44\u6e90\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u4e4b\u540e\u53d1\u751f\u4e86\u4fee\u6539\uff0c\u90a3\u4e48\u4f1a\u8fd4\u56de 412 (Precondition Failed) \u9519\u8bef\u3002<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>ETag<\/td>\n<td>\u5426<\/td>\n<td>\u662f<\/td>\n<td>TagHTTP\u54cd\u5e94\u5934\u662f\u8d44\u6e90\u7684\u7279\u5b9a\u7248\u672c\u7684\u6807\u8bc6\u7b26\u3002\u8fd9\u53ef\u4ee5\u8ba9\u7f13\u5b58\u66f4\u9ad8\u6548\uff0c\u5e76\u8282\u7701\u5e26\u5bbd\uff0c\u56e0\u4e3a\u5982\u679c\u5185\u5bb9\u6ca1\u6709\u6539\u53d8\uff0cWeb\u670d\u52a1\u5668\u4e0d\u9700\u8981\u53d1\u9001\u5b8c\u6574\u7684\u54cd\u5e94\u3002\u800c\u5982\u679c\u5185\u5bb9\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u4f7f\u7528ETag\u6709\u52a9\u4e8e\u9632\u6b62\u8d44\u6e90\u7684\u540c\u65f6\u66f4\u65b0\u76f8\u4e92\u8986\u76d6\uff08\u201c\u7a7a\u4e2d\u78b0\u649e\u201d\uff09<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>Expires<\/td>\n<td>\u5426<\/td>\n<td>\u662f<\/td>\n<td>Expires \u54cd\u5e94\u5934\u5305\u542b\u65e5\u671f\/\u65f6\u95f4\uff0c \u5373\u5728\u6b64\u65f6\u5019\u4e4b\u540e\uff0c\u54cd\u5e94\u8fc7\u671f<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>Last-Modified<\/td>\n<td>\u5426<\/td>\n<td>\u662f<\/td>\n<td>\u5305\u542b\u6e90\u5934\u670d\u52a1\u5668\u8ba4\u5b9a\u7684\u8d44\u6e90\u505a\u51fa\u4fee\u6539\u7684\u65e5\u671f\u53ca\u65f6\u95f4\u3002 \u5b83\u901a\u5e38\u88ab\u7528\u4f5c\u4e00\u4e2a\u9a8c\u8bc1\u5668\u6765\u5224\u65ad\u63a5\u6536\u5230\u7684\u6216\u8005\u5b58\u50a8\u7684\u8d44\u6e90\u662f\u5426\u5f7c\u6b64\u4e00\u81f4\u3002\u7531\u4e8e\u7cbe\u786e\u5ea6\u6bd4  ETag \u8981\u4f4e\uff0c\u6240\u4ee5\u8fd9\u662f\u4e00\u4e2a\u5907\u7528\u673a\u5236\u3002\u5305\u542b\u6709  If-Modified-Since \u6216 If-Unmodified-Since \u9996\u90e8\u7684\u6761\u4ef6\u8bf7\u6c42\u4f1a\u4f7f\u7528\u8fd9\u4e2a\u5b57\u6bb5\u3002<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>Date<\/td>\n<td>\u662f<\/td>\n<td>\u662f<\/td>\n<td>\u6d88\u606f\u751f\u6210\u7684\u65f6\u95f4<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<tr>\n<td>If-Range<\/td>\n<td>\u662f<\/td>\n<td>\u5426<\/td>\n<td>If-Range HTTP \u8bf7\u6c42\u5934\u5b57\u6bb5\u7528\u6765\u4f7f\u5f97 Range \u5934\u5b57\u6bb5\u5728\u4e00\u5b9a\u6761\u4ef6\u4e0b\u8d77\u4f5c\u7528\uff1a\u5f53\u5b57\u6bb5\u503c\u4e2d\u7684\u6761\u4ef6\u5f97\u5230\u6ee1\u8db3\u65f6\uff0cRange \u5934\u5b57\u6bb5\u624d\u4f1a\u8d77\u4f5c\u7528\uff0c\u540c\u65f6\u670d\u52a1\u5668\u56de\u590d206 \u90e8\u5206\u5185\u5bb9\u72b6\u6001\u7801\uff0c\u4ee5\u53caRange \u5934\u5b57\u6bb5\u8bf7\u6c42\u7684\u76f8\u5e94\u90e8\u5206\uff1b\u5982\u679c\u5b57\u6bb5\u503c\u4e2d\u7684\u6761\u4ef6\u6ca1\u6709\u5f97\u5230\u6ee1\u8db3\uff0c\u670d\u52a1\u5668\u5c06\u4f1a\u8fd4\u56de 200 OK \u72b6\u6001\u7801\uff0c\u5e76\u8fd4\u56de\u5b8c\u6574\u7684\u8bf7\u6c42\u8d44\u6e90\u3002<\/td>\n<td>HTTP\/1.1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u4e8c\u3001\u8be6\u7ec6\u8bf4\u660e<\/h2>\n<p>\u4e00\u773c\u770b\u4e0a\u53bb\uff0c\u7f13\u5b58\u76f8\u5173\u7684\u5b57\u6bb5\u786e\u5b9e\u6709\u5f88\u591a\u3002\u4f46\u662f\u5b9e\u9645\u4e0a\uff0c\u7a0d\u5fae\u7406\u4e00\u7406\u601d\u8def\u5373\u53ef\u3002<\/p>\n<p>\u4e0a\u9762\u6240\u6709\u7684\u5b57\u6bb5\u90fd\u5728\u56f4\u7ed5\u77403\u4e2a\u70b9\uff1a<\/p>\n<ul>\n<li>1.\u662f\u5426\u8981\u7f13\u5b58<\/li>\n<li>2.\u7f13\u5b58\u591a\u4e45<\/li>\n<li>3.\u7f13\u5b58\u662f\u5426\u6709\u6548<\/li>\n<\/ul>\n<h3>2.1 \u662f\u5426\u8981\u7f13\u5b58<\/h3>\n<p>\u4e00\u4e2aHTTP\u7684\u5ba2\u6237\u7aef\uff08\u5305\u62ec\u6d4f\u89c8\u5668\uff0c\u4ee5\u53caCDN\u7b49\u7f13\u5b58\u4ee3\u7406\uff09\u5982\u4f55\u77e5\u9053\u5f53\u524d\u7684\u8bf7\u6c42\u662f\u5426\u8981\u7f13\u5b58\u5462\uff1f<\/p>\n<p>\u5728<code>Cache-Control<\/code>\u4e2d\uff0c\u6709\u4e0b\u5217\u53d6\u503c\u6765\u51b3\u5b9a\u662f\u5426\u7f13\u5b58\uff1a<\/p>\n<pre><code>public:\u8868\u660e\u54cd\u5e94\u53ef\u4ee5\u88ab\u4efb\u4f55\u5bf9\u8c61\uff08\u5305\u62ec\uff1a\u53d1\u9001\u8bf7\u6c42\u7684\u5ba2\u6237\u7aef\uff0c\u4ee3\u7406\u670d\u52a1\u5668\uff0c\u7b49\u7b49\uff09\u7f13\u5b58\u3002\nprivate:\u8868\u660e\u54cd\u5e94\u53ea\u80fd\u88ab\u5355\u4e2a\u7528\u6237\u7f13\u5b58\uff0c\u4e0d\u80fd\u4f5c\u4e3a\u5171\u4eab\u7f13\u5b58\uff08\u5373\u4ee3\u7406\u670d\u52a1\u5668\u4e0d\u80fd\u7f13\u5b58\u5b83\uff09,\u53ef\u4ee5\u7f13\u5b58\u54cd\u5e94\u5185\u5bb9\u3002\nno-store:\u7f13\u5b58\u4e0d\u5e94\u5b58\u50a8\u6709\u5173\u5ba2\u6237\u7aef\u8bf7\u6c42\u6216\u670d\u52a1\u5668\u54cd\u5e94\u7684\u4efb\u4f55\u5185\u5bb9\u3002\n<\/code><\/pre>\n<h3>2.2 \u7f13\u5b58\u591a\u4e45<\/h3>\n<p>\u6e90\u670d\u52a1\u5668\u4e0a\u7684\u5185\u5bb9\u53ef\u80fd\u968f\u65f6\u53d1\u751f\u53d8\u5316\uff0c\u90a3\u4e48\u5982\u4f55\u77e5\u9053\u4ec0\u4e48\u65f6\u5019\u53bb\u68c0\u67e5\u7f13\u5b58\u662f\u5426\u66f4\u65b0\u4e86\u5462\uff1fHTTP\u534f\u8bae\u4e2d\u6709\u4ee5\u4e0b\u5b57\u6bb5\u89c4\u5b9a\u4e86\u4e00\u4e2a\u7f13\u5b58\u7684\u6709\u6548\u671f\u3002<\/p>\n<p><strong>Cache-Control<\/strong><\/p>\n<pre><code>max-age={seconds}\uff1a\u8bbe\u7f6e\u7f13\u5b58\u5b58\u50a8\u7684\u6700\u5927\u5468\u671f\uff0c\u8d85\u8fc7\u8fd9\u4e2a\u65f6\u95f4\u7f13\u5b58\u88ab\u8ba4\u4e3a\u8fc7\u671f(\u5355\u4f4d\u79d2)\u3002\u4e0eExpires\u76f8\u53cd\uff0c\u65f6\u95f4\u662f\u76f8\u5bf9\u4e8e\u8bf7\u6c42\u7684\u65f6\u95f4\u3002\ns-maxage={seconds}\uff1a\u8986\u76d6max-age \u6216\u8005 Expires \u5934\uff0c\u4f46\u662f\u4ec5\u9002\u7528\u4e8e\u5171\u4eab\u7f13\u5b58(\u6bd4\u5982\u5404\u4e2a\u4ee3\u7406)\uff0c\u5e76\u4e14\u79c1\u6709\u7f13\u5b58\u4e2d\u5b83\u88ab\u5ffd\u7565\u3002\nmax-stale[={seconds}]\uff1a\u8868\u660e\u5ba2\u6237\u7aef\u613f\u610f\u63a5\u6536\u4e00\u4e2a\u5df2\u7ecf\u8fc7\u671f\u7684\u8d44\u6e90\u3002 \u53ef\u9009\u7684\u8bbe\u7f6e\u4e00\u4e2a\u65f6\u95f4(\u5355\u4f4d\u79d2)\uff0c\u8868\u793a\u54cd\u5e94\u4e0d\u80fd\u8d85\u8fc7\u7684\u8fc7\u65f6\u65f6\u95f4\u3002\nmin-fresh={seconds}\uff1a\u8868\u793a\u5ba2\u6237\u7aef\u5e0c\u671b\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u5185\u83b7\u53d6\u6700\u65b0\u7684\u54cd\u5e94\u3002\n<\/code><\/pre>\n<p><strong>Expire<\/strong><\/p>\n<pre><code>Expires: {http-date}: \u8868\u793a\u5728http-date\u4e4b\u540e\uff0c\u8fd9\u4e2a\u7f13\u5b58\u5c31\u8fc7\u671f\u4e86\u3002\u5982\u679chttp-date\u662f\u4e00\u4e2a\u65e0\u6548\u7684\u65f6\u95f4\u503c\uff0c\u5219\u4ee3\u8868\u5df2\u8fc7\u671f\u3002\u5982\u679c\u5728Cache-Control\u54cd\u5e94\u5934\u8bbe\u7f6e\u4e86 \"max-age\" \u6216\u8005 \"s-max-age\" \u6307\u4ee4\uff0c\u90a3\u4e48 Expires \u5934\u4f1a\u88ab\u5ffd\u7565\u3002\n<\/code><\/pre>\n<p><strong>Date\u548cLast-Modified<\/strong><\/p>\n<pre><code>\u5982\u679c\u5728`Cache-Control`\u548c`Expire`\u90fd\u6ca1\u6709\u8fd4\u56de\u7684\u60c5\u51b5\u4e0b\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7`Date`\u5934\u548c`Last-Modified`\u5934\u53bb\u8ba1\u7b97\u7f13\u5b58\u7684\u6709\u6548\u671f\u3002\u7f13\u5b58\u7684\u5bff\u547d\u5c31\u7b49\u4e8e\u5934\u91cc\u9762Date\u7684\u503c\u51cf\u53bbLast-Modified\u7684\u503c\u9664\u4ee510\u3002\n<\/code><\/pre>\n<h3>2.3 \u7f13\u5b58\u662f\u5426\u6709\u6548<\/h3>\n<p>\u6e90\u670d\u52a1\u5668\u4e0a\u7684\u5185\u5bb9\u53ef\u80fd\u968f\u65f6\u53d1\u751f\u53d8\u5316, \u90a3\u4e48HTTP\u5ba2\u6237\u7aef\u5982\u679c\u77e5\u9053\u81ea\u5df1\u7f13\u5b58\u7684\u5185\u5bb9\u662f\u5426\u6709\u6548\u5462\uff1f\u8fd9\u91cc\u8981\u5206\u51e0\u79cd\u60c5\u51b5\uff1a<\/p>\n<ul>\n<li>\u670d\u52a1\u5668\u7684\u54cd\u5e94\u4e2d\u6709<code>Cache-Control:must-revalidate<\/code>\u5934\uff1a\u5f53\u524d\u7f13\u5b58\u5728\u6709\u6548\u65f6\u95f4\u5185\uff0c\u6b64\u65f6\u7f13\u5b58\u9ed8\u8ba4\u5c31\u662f\u6709\u6548\u7684\u3002\u5f53\u524d\u7f13\u5b58\u8fc7\u4e86\u6709\u6548\u65f6\u95f4\uff0c\u5219\u4f1a\u5411\u670d\u52a1\u5668\u9a8c\u8bc1\u7f13\u5b58\u662f\u5426\u8fc7\u671f\u3002\u5982\u679c\u670d\u52a1\u8fd4\u56de304\uff0c\u5219\u4ee3\u8868\u7f13\u5b58\u6ca1\u6709\u8fc7\u671f\u3002<\/li>\n<li>\u670d\u52a1\u5668\u7684\u54cd\u5e94\u4e2d\u6709<code>Cache-Control: no-cache<\/code>\u6216<code>Pragma:no-cache<\/code>\u5934\uff1a\u5219\u8868\u793a\u6bcf\u4e00\u6b21\u90fd\u8981\u4ece\u670d\u52a1\u5668\u9a8c\u8bc1\u7f13\u5b58\u662f\u5426\u8fc7\u671f\u3002no-cache\u7684\u4f18\u5148\u7ea7\u662f\u8981\u5927\u4e8ePragma\u7684<\/li>\n<\/ul>\n<p>\u6ce8\uff1ano-cache\u548cmust-revalidate\u7684\u533a\u522b<\/p>\n<blockquote><p>\n  \u5728RFC7234\u4e2d\u8bf4\u5230\uff1a<\/p>\n<p>  &#8220;must-revalidate&#8221; \u54cd\u5e94\u5934\u6307\u4ee4\u8868\u793a\u4e00\u65e6\u8be5\u54cd\u5e94\u8fc7\u671f\uff0c\u8fd9\u4e2a\u7f13\u5b58\u5728\u5411\u6e90\u670d\u52a1\u5668\u6210\u529f\u9a8c\u8bc1\u4e4b\u524d\u7981\u6b62\u4f7f\u7528\u3002\u5728\u4efb\u4f55\u60c5\u51b5\u4e0b\uff0c\u4e00\u4e2a\u7f13\u5b58\u90fd\u5fc5\u987b\u9075\u5faa&#8221;must-revalidate&#8221;\u6307\u4ee4\uff1b\u7279\u6b8a\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u6e90\u670d\u52a1\u5668\u65e0\u6cd5\u8fde\u63a5\uff0c\u5fc5\u987b\u751f\u6210504(Getway Timeout)\u54cd\u5e94\u3002<\/p>\n<p>  &#8220;no-cache&#8221;\u54cd\u5e94\u5934\u6307\u4ee4\u8868\u793a\u7f13\u5b58\u5728\u5411\u6e90\u670d\u52a1\u5668\u6210\u529f\u9a8c\u8bc1\u4e4b\u524d\u7981\u6b62\u4f7f\u7528\uff08\u6ce8\uff1a\u4e0d\u8bba\u7f13\u5b58\u662f\u5426\u8fc7\u671f\uff09\u3002\u5982\u679c&#8221;no-cache&#8221;\u6307\u4ee4\u6307\u660e\u4e86\u4e00\u6216\u591a\u4e2a\u5b57\u6bb5\uff0c\u7f13\u5b58\u53ef\u4ee5\u88ab\u7528\u6765\u54cd\u5e94\u4e4b\u540e\u7684\u8bf7\u6c42\u3002\u4f46\u662f\uff0c\u5728\u6ca1\u6709\u548c\u6e90\u670d\u52a1\u5668\u8fdb\u884c\u9a8c\u8bc1\u7684\u60c5\u51b5\u4e0b\uff0c\u4efb\u4f55&#8221;no-cache&#8221;\u4e2d\u5217\u51fa\u7684\u5b57\u6bb5\u90fd\u7981\u6b62\u5728\u4e4b\u540e\u7684\u54cd\u5e94\u4e2d\u88ab\u53d1\u9001\u3002\u8fd9\u4f7f\u5f97\u6e90\u670d\u52a1\u5668\u53ef\u4ee5\u963b\u6b62\u67d0\u4e9b\u5b57\u6bb5\u88ab\u91cd\u590d\u4f7f\u7528\uff0c\u4f46\u662f\u4ecd\u7136\u53ef\u4ee5\u7f13\u5b58\u54cd\u5e94\u7684\u5176\u4ed6\u90e8\u5206\u3002<\/p>\n<p>  &#8220;no-cache&#8221;\u4e2d\u7684\u5b57\u6bb5\u4e0d\u4ec5\u4ec5\u9650\u4e8ehttp1.1\u534f\u8bae\u4e2d\u5217\u4e3e\u51fa\u6765\u7684\u5b57\u6bb5\u3002\u5b57\u6bb5\u540d\u662f\u5927\u5c0f\u5199\u4e0d\u654f\u611f\u7684\u3002\u4f7f\u7528\u53cc\u5f15\u53f7\u5305\u56f4\u3002<\/p>\n<p>  \u56e0\u6b64\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u5728\u67d0\u4e9b\u65f6\u5019max-age=0;must-revalidate \u53ef\u4ee5\u7b49\u540c\u4e8e no-cache\u3002\n<\/p><\/blockquote>\n<p>\u90a3\u4e48\u8fd9\u4e2a\u9a8c\u8bc1\u673a\u5236\u662f\u4ec0\u4e48\u6837\u7684\uff1f\u4e5f\u5206\u51e0\u79cd\u60c5\u51b5<\/p>\n<ul>\n<li>\u6839\u636e\u6587\u4ef6\u6307\u7eb9<code>ETag<\/code>\uff1a\u5728\u670d\u52a1\u5668\u8fd4\u56de\u4e86\u4e00\u4e2a\u6587\u4ef6\u7684<code>ETag<\/code>\u7684\u60c5\u51b5\u4e0b\uff0cHTTP\u5ba2\u6237\u7aef\u53ef\u4ee5\u6839\u636e<code>If-None-Match<\/code>\u6216<code>If-Match<\/code>\u6765\u5411\u670d\u52a1\u5668\u9a8c\u8bc1\u5f53\u524d\u7f13\u5b58\u662f\u5426\u8fc7\u671f\u3002<\/li>\n<li>\u6839\u636e\u6587\u4ef6\u4fee\u6539\u65f6\u95f4\uff1a\u5728\u670d\u52a1\u5668\u8fd4\u56de\u4e86<code>Last-Modified<\/code>\u7684\u60c5\u51b5\u4e0b\uff0cHTTP\u5ba2\u6237\u7aef\u53ef\u4ee5\u6839\u636e<code>If-Unmodified-Since<\/code>\u6216<code>If-Modified-Since<\/code>\u6765\u5411\u670d\u52a1\u5668\u9a8c\u8bc1\u5f53\u524d\u7f13\u5b58\u662f\u5426\u8fc7\u671f\u3002<\/li>\n<li>\u4e00\u4e2a\u6bd4\u8f83\u7279\u6b8a\u7684<code>If-Range<\/code>\uff1a<code>If-Range<\/code>\u901a\u5e38\u51fa\u73b0\u5728\u5206\u6bb5\u8bf7\u6c42\u5f53\u4e2d\uff0c\u7528\u6765\u5206\u6bb5\u8bf7\u6c42\u7684\u8d44\u6e90\u4e3b\u4f53\u662f\u5426\u53d1\u751f\u4e86\u53d8\u5316\u3002\u5b83\u7684\u503c\u65e2\u53ef\u4ee5\u662fetag\uff0c\u4e5f\u53ef\u4ee5\u662fGMT\u65f6\u95f4\u6233\u3002<\/li>\n<\/ul>\n<p>\u6ce8\uff1a\u56e0\u4e3aLast-Modified\u7cbe\u786e\u5230\u79d2\uff0c\u5728\u7cbe\u786e\u5ea6\u4e0a\u6bd4ETag\u4f4e\uff0c\u6240\u4ee5\u5e94\u8be5\u4ee5ETag\u4e3a\u4e3b\u3002<\/p>\n<p>2.4 \u5173\u4e8evary\u5b57\u6bb5<\/p>\n<p>\u4e0a\u9762\u8bf4\u4e86\u4e09\u4e2a\u70b9\uff0c\u4f46\u662f\u6ca1\u6709\u6d89\u53ca\u5230vary\u5b57\u6bb5\u3002vary\u548c\u7f13\u5b58\u5e76\u4e0d\u662f\u76f4\u63a5\u76f8\u5173\u7684\u3002\u53d6\u4e00\u6bb5MDN\u7684\u8bf4\u660e\uff1a<\/p>\n<blockquote><p>\n  Vary \u662f\u4e00\u4e2aHTTP\u54cd\u5e94\u5934\u90e8\u4fe1\u606f\uff0c\u5b83\u51b3\u5b9a\u4e86\u5bf9\u4e8e\u672a\u6765\u7684\u4e00\u4e2a\u8bf7\u6c42\u5934\uff0c\u5e94\u8be5\u7528\u4e00\u4e2a\u7f13\u5b58\u7684\u56de\u590d(response)\u8fd8\u662f\u5411\u6e90\u670d\u52a1\u5668\u8bf7\u6c42\u4e00\u4e2a\u65b0\u7684\u56de\u590d\u3002\u5b83\u88ab\u670d\u52a1\u5668\u7528\u6765\u8868\u660e\u5728 content negotiation algorithm\uff08\u5185\u5bb9\u534f\u5546\u7b97\u6cd5\uff09\u4e2d\u9009\u62e9\u4e00\u4e2a\u8d44\u6e90\u4ee3\u8868\u7684\u65f6\u5019\u5e94\u8be5\u4f7f\u7528\u54ea\u4e9b\u5934\u90e8\u4fe1\u606f\uff08headers\uff09.<\/p>\n<p>  \u5728\u54cd\u5e94\u72b6\u6001\u7801\u4e3a 304 Not Modified  \u7684\u54cd\u5e94\u4e2d\uff0c\u4e5f\u8981\u8bbe\u7f6e Vary \u9996\u90e8\uff0c\u800c\u4e14\u8981\u4e0e\u76f8\u5e94\u7684 200 OK \u54cd\u5e94\u8bbe\u7f6e\u5f97\u4e00\u6a21\u4e00\u6837\u3002\n<\/p><\/blockquote>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5982\u679c\u670d\u52a1\u5668\u8fd4\u56de\u7684\u7f51\u9875\u662f\u5206\u624b\u673a\u7248\u548c\u7535\u8111\u7248\u7684\uff0c\u4e00\u822c\u6211\u4eec\u4f1a\u6839\u636euser-agent\u6765\u5224\u65ad\u6d4f\u89c8\u5668\u662f\u624b\u673a\u6d4f\u89c8\u5668\u8fd8\u662f\u7535\u8111\u4e0a\u7684\u6d4f\u89c8\u5668\u3002\u5047\u8bbe\u6709\u4e00\u4e2a\u4e2d\u95f4\u4ee3\u7406\u7684\u8bf7\u6c42\uff1a<\/p>\n<pre><code class=\"line-numbers\">\u624b\u673a\u7528\u62371\u8bf7\u6c42index.html----------&gt;\u4e2d\u95f4\u4ee3\u7406------------&gt;\u6e90\u670d\u52a1\u5668\n\u7535\u8111\u7528\u62371\u8bf7\u6c42index.html----------&gt;\u4e2d\u95f4\u4ee3\u7406------------&gt;\u6e90\u670d\u52a1\u5668\n<\/code><\/pre>\n<p>\u5728\u7535\u8111\u7528\u62371\u8bf7\u6c42index.html\u65f6\uff0c\u4e2d\u95f4\u4ee3\u7406\u4f1a\u5411\u539f\u670d\u52a1\u5668\u8bf7\u6c42\u8fd8\u662f\u76f4\u63a5\u4f7f\u7528\u672c\u5730\u7f13\u5b58\u7684\u526f\u672c\u5462\uff1f<\/p>\n<p>\u5982\u679c\u539f\u670d\u52a1\u5668\u5728\u7b2c\u4e00\u6b21\u8bf7\u6c42\u65f6\u54cd\u5e94\u5934\u4e2d\u6709<code>vary:user-agent<\/code>\u5219\u4f1a\u91cd\u65b0\u8bf7\u6c42\u3002\u56e0\u4e3a\u4e24\u6b21\u8bf7\u6c42\u7684user-agent\u662f\u4e0d\u540c\u7684\uff0c\u56e0\u6b64\u7f13\u5b58\u4e0d\u80fd\u88ab\u91cd\u590d\u4f7f\u7528\u3002\u4f46\u662f\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u5219\u4f7f\u7528\u672c\u5730\u7f13\u5b58\u4f5c\u4e3a\u54cd\u5e94\u3002<\/p>\n<hr \/>\n<h2>\u53c2\u8003\u6587\u6863<\/h2>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"http:\/\/imweb.io\/topic\/5795dcb6fb312541492eda8c\">HTTP\u7f13\u5b58\u63a7\u5236\u5c0f\u7ed3<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/imququ.com\/post\/vary-header-in-http.html\">HTTP \u534f\u8bae\u4e2d Vary \u7684\u4e00\u4e9b\u7814\u7a76<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"http:\/\/www.cnblogs.com\/chyingp\/p\/no-cache-vs-must-revalidate.html\">http:\/\/www.cnblogs.com\/chyingp\/p\/no-cache-vs-must-revalidate.html<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developers.google.com\/web\/fundamentals\/performance\/optimizing-content-efficiency\/http-caching?hl=zh-cn\">HTTP\u7f13\u5b58<\/a><\/p>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Caching_FAQ\">HTTP Caching | MDN<\/a><\/p>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/Cache-Control\">Cache-Control | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/Pragma\">Pragma | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/Vary\">Vary | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/If-Match\">If-Match | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/If-None-Match\">If-None-Match | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/If-Modified-Since\">If-Modified-Since | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/If-Unmodified-Since\">If-Unmodified-Since | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/ETag\">ETag | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/Expires\">Expires | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/Last-Modified\">Last-Modified | MDN<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/HTTP\/Headers\/If-Range\">If-Range | MDN<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u603b\u89c8 HTTP\u534f\u8bae\u4e2d\u6709\u4ee5\u4e0b\u7684\u5934\u90e8\u5b57\u6bb5\u548c\u7f13\u5b58\u76f8\u5173\uff08\u5f88\u591a\u5185\u5bb9\u90fd\u662f\u590d\u5236\u7684MDN\u7684\u6587\u6863\uff09 \u5b57\u6bb5\u540d \u8bf7\u6c42\u5934\u5305\u542b \u54cd\u5e94 &hellip; <a href=\"https:\/\/www.myway5.com\/index.php\/2018\/08\/13\/http-cache-control\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">HTTP\u534f\u8bae\u4e2d\u7684\u7f13\u5b58\u63a7\u5236<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[60],"tags":[64,65],"class_list":["post-353","post","type-post","status-publish","format-standard","hentry","category-protocal","tag-http","tag-65"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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