{"id":1075,"date":"2015-05-14T11:15:01","date_gmt":"2015-05-14T03:15:01","guid":{"rendered":"http:\/\/zerobox.org\/notes\/?p=1075"},"modified":"2016-06-02T19:36:20","modified_gmt":"2016-06-02T11:36:20","slug":"http2-%e6%96%b0%e7%89%b9%e6%80%a7%e6%b5%85%e6%9e%90","status":"publish","type":"post","link":"http:\/\/zerobox.org\/notes\/1075.html","title":{"rendered":"HTTP\/2 \u65b0\u7279\u6027\u6d45\u6790"},"content":{"rendered":"<h3 id=\"http2--spdy2\">HTTP\/2 \u6e90\u81ea SPDY\/2<\/h3>\n<p>SPDY \u7cfb\u5217\u534f\u8bae\u7531\u8c37\u6b4c\u5f00\u53d1\uff0c\u4e8e 2009 \u5e74\u516c\u5f00\u3002\u5b83\u7684\u8bbe\u8ba1\u76ee\u6807\u662f\u964d\u4f4e 50% \u7684\u9875\u9762\u52a0\u8f7d\u65f6\u95f4\u3002\u5f53\u4e0b\u5f88\u591a\u8457\u540d\u7684\u4e92\u8054\u7f51\u516c\u53f8\uff0c\u4f8b\u5982\u767e\u5ea6\u3001\u6dd8\u5b9d\u3001UPYUN \u90fd\u5728\u81ea\u5df1\u7684\u7f51\u7ad9\u6216 APP \u4e2d\u91c7\u7528\u4e86 SPDY \u7cfb\u5217\u534f\u8bae\uff08\u5f53\u524d\u6700\u65b0\u7248\u672c\u662f SPDY\/3.1\uff09\uff0c\u56e0\u4e3a\u5b83\u5bf9\u6027\u80fd\u7684\u63d0\u5347\u662f\u663e\u800c\u6613\u89c1\u7684\u3002\u4e3b\u6d41\u7684\u6d4f\u89c8\u5668\uff08\u8c37\u6b4c\u3001\u706b\u72d0\u3001Opera\uff09\u4e5f\u90fd\u65e9\u5df2\u7ecf\u652f\u6301 SPDY\uff0c\u5b83\u5df2\u7ecf\u6210\u4e3a\u4e86\u5de5\u4e1a\u6807\u51c6\uff0cHTTP Working-Group \u6700\u7ec8\u51b3\u5b9a\u4ee5 SPDY\/2 \u4e3a\u57fa\u7840\uff0c\u5f00\u53d1 HTTP\/2\u3002<\/p>\n<p>\u4f46\u662f\uff0cHTTP\/2 \u8ddf SPDY \u4ecd\u6709\u4e0d\u540c\u7684\u5730\u65b9\uff0c\u4e3b\u8981\u662f\u4ee5\u4e0b\u4e24\u70b9\uff1a<\/p>\n<ol>\n<li>HTTP\/2 \u652f\u6301\u660e\u6587 HTTP \u4f20\u8f93\uff0c\u800c SPDY \u5f3a\u5236\u4f7f\u7528 HTTPS<\/li>\n<li>HTTP\/2 \u6d88\u606f\u5934\u7684\u538b\u7f29\u7b97\u6cd5\u91c7\u7528 HPACK\uff0c\u800c\u975e SPDY \u91c7\u7528\u7684 DELEFT<\/li>\n<\/ol>\n<h3 id=\"http2-\">HTTP\/2 \u7684\u4f18\u52bf<\/h3>\n<p>\u76f8\u6bd4 HTTP\/1.x\uff0cHTTP\/2 \u5728\u5e95\u5c42\u4f20\u8f93\u505a\u4e86\u5f88\u5927\u7684\u6539\u52a8\u548c\u4f18\u5316\uff1a<\/p>\n<ol>\n<li>HTTP\/2 \u91c7\u7528\u4e8c\u8fdb\u5236\u683c\u5f0f\u4f20\u8f93\u6570\u636e\uff0c\u800c\u975e HTTP\/1.x \u7684\u6587\u672c\u683c\u5f0f\u3002\u4e8c\u8fdb\u5236\u683c\u5f0f\u5728\u534f\u8bae\u7684\u89e3\u6790\u548c\u4f18\u5316\u6269\u5c55\u4e0a\u5e26\u6765\u66f4\u591a\u7684\u4f18\u52bf\u548c\u53ef\u80fd\u3002<\/li>\n<li>HTTP\/2 \u5bf9\u6d88\u606f\u5934\u91c7\u7528 HPACK \u8fdb\u884c\u538b\u7f29\u4f20\u8f93\uff0c\u80fd\u591f\u8282\u7701\u6d88\u606f\u5934\u5360\u7528\u7684\u7f51\u7edc\u7684\u6d41\u91cf\u3002\u800c HTTP\/1.x \u6bcf\u6b21\u8bf7\u6c42\uff0c\u90fd\u4f1a\u643a\u5e26\u5927\u91cf\u5197\u4f59\u5934\u4fe1\u606f\uff0c\u6d6a\u8d39\u4e86\u5f88\u591a\u5e26\u5bbd\u8d44\u6e90\u3002\u5934\u538b\u7f29\u80fd\u591f\u5f88\u597d\u7684\u89e3\u51b3\u8be5\u95ee\u9898\u3002<\/li>\n<li>\u591a\u8def\u590d\u7528\uff0c\u76f4\u767d\u7684\u8bf4\u5c31\u662f\u6240\u6709\u7684\u8bf7\u6c42\u90fd\u662f\u901a\u8fc7\u4e00\u4e2a TCP \u8fde\u63a5\u5e76\u53d1\u5b8c\u6210\u3002HTTP\/1.x \u867d\u7136\u901a\u8fc7 pipeline\u4e5f\u80fd\u5e76\u53d1\u8bf7\u6c42\uff0c\u4f46\u662f\u591a\u4e2a\u8bf7\u6c42\u4e4b\u95f4\u7684\u54cd\u5e94\u4f1a\u88ab\u963b\u585e\u7684\uff0c\u6240\u4ee5 pipeline \u81f3\u4eca\u4e5f\u6ca1\u6709\u88ab\u666e\u53ca\u5e94\u7528\uff0c\u800c HTTP\/2 \u505a\u5230\u4e86\u771f\u6b63\u7684\u5e76\u53d1\u8bf7\u6c42\u3002\u540c\u65f6\uff0c\u6d41\u8fd8\u652f\u6301\u4f18\u5148\u7ea7\u548c\u6d41\u91cf\u63a7\u5236\u3002<\/li>\n<li>Server Push\uff1a\u670d\u52a1\u7aef\u80fd\u591f\u66f4\u5feb\u7684\u628a\u8d44\u6e90\u63a8\u9001\u7ed9\u5ba2\u6237\u7aef\u3002\u4f8b\u5982\u670d\u52a1\u7aef\u53ef\u4ee5\u4e3b\u52a8\u628a JS \u548c CSS \u6587\u4ef6\u63a8\u9001\u7ed9\u5ba2\u6237\u7aef\uff0c\u800c\u4e0d\u9700\u8981\u5ba2\u6237\u7aef\u89e3\u6790 HTML \u518d\u53d1\u9001\u8fd9\u4e9b\u8bf7\u6c42\u3002\u5f53\u5ba2\u6237\u7aef\u9700\u8981\u7684\u65f6\u5019\uff0c\u5b83\u5df2\u7ecf\u5728\u5ba2\u6237\u7aef\u4e86\u3002<\/li>\n<\/ol>\n<p>HTTP\/2 \u4e3b\u8981\u662f HTTP\/1.x \u5728\u5e95\u5c42\u4f20\u8f93\u673a\u5236\u4e0a\u7684\u5b8c\u5168\u91cd\u6784\uff0cHTTP\/2 \u662f\u57fa\u672c\u517c\u5bb9 HTTP\/1.x \u7684\u8bed\u4e49\u7684(\u8be6\u7ec6\u517c\u5bb9\u6027\u8bf4\u660e\u8bf7\u6233\u8fd9\u91cc)\u3002<code>Content-Type<\/code> \u4ecd\u7136\u662f <code>Content-Type<\/code>\uff0c\u53ea\u4e0d\u8fc7\u5b83\u4e0d\u518d\u662f\u6587\u672c\u4f20\u8f93\u4e86\u3002\u90a3\u4e48 HTTP\/2 \u7684\u8fd9\u4e9b\u65b0\u7279\u6027\u53c8\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u5462\uff1f<\/p>\n<h3 id=\"http2---frame\">HTTP\/2 \u7684\u57fa\u77f3 \uff0d Frame<\/h3>\n<p>Frame \u662f HTTP\/2 \u4e8c\u8fdb\u5236\u683c\u5f0f\u7684\u57fa\u7840\uff0c\u57fa\u672c\u53ef\u4ee5\u628a\u5b83\u7406\u89e3\u4e3a\u5b83 TCP \u91cc\u9762\u7684\u6570\u636e\u5305\u4e00\u6837\u3002HTTP\/2 \u4e4b\u6240\u4ee5\u80fd\u591f\u6709\u5982\u6b64\u591a\u7684\u65b0\u7279\u6027\uff0c\u6b63\u662f\u56e0\u4e3a\u5e95\u5c42\u6570\u636e\u683c\u5f0f\u7684\u6539\u53d8\u3002 Frame \u7684\u57fa\u672c\u683c\u5f0f\u5982\u4e0b\uff08\u56fe\u4e2d\u7684\u6570\u5b57\u8868\u793a\u6240\u5360\u4f4d\u6570\uff0c\u5185\u5bb9\u6458\u81ea http2-draft-17\uff09:<\/p>\n<pre><code>+-----------------------------------------------+\r\n|                 Length (24)                   |\r\n+---------------+---------------+---------------+\r\n|   Type (8)    |   Flags (8)   |\r\n+-+-------------+---------------+-------------------+\r\n|R|                 Stream Identifier (31)          |\r\n+=+=================================================+\r\n|                   Frame Payload (0...)        ...\r\n+---------------------------------------------------+\r\n<\/code><\/pre>\n<p><strong>Length<\/strong>: \u8868\u793a Frame Payload \u90e8\u5206\u7684\u957f\u5ea6\uff0c\u53e6\u5916 Frame Header \u7684\u957f\u5ea6\u662f\u56fa\u5b9a\u7684 9 \u5b57\u8282\uff08Length + Type + Flags + R + Stream Identifier = 72 bit\uff09\u3002<\/p>\n<p><strong>Type<\/strong>: \u533a\u5206\u8fd9\u4e2a Frame Payload \u5b58\u50a8\u7684\u6570\u636e\u662f\u5c5e\u4e8e HTTP Header \u8fd8\u662f HTTP Body\uff1b\u53e6\u5916 HTTP\/2 \u65b0\u5b9a\u4e49\u4e86\u4e00\u4e9b\u5176\u4ed6\u7684 Frame Type\uff0c\u4f8b\u5982\uff0c\u8fd9\u4e2a\u5b57\u6bb5\u4e3a 0 \u65f6\uff0c\u8868\u793a DATA \u7c7b\u578b\uff08\u5373 HTTP\/1.x \u91cc\u7684 Body \u90e8\u5206\u6570\u636e\uff09<\/p>\n<p><strong>Flags<\/strong>: \u5171 8 \u4f4d\uff0c \u6bcf\u4f4d\u90fd\u8d77\u6807\u8bb0\u4f5c\u7528\u3002\u6bcf\u79cd\u4e0d\u540c\u7684 Frame Type \u90fd\u6709\u4e0d\u540c\u7684 Frame Flags\u3002\u4f8b\u5982\u53d1\u9001\u6700\u540e\u4e00\u4e2a DATA \u7c7b\u578b\u7684 Frame \u65f6\uff0c\u5c31\u4f1a\u5c06 Flags \u6700\u540e\u4e00\u4f4d\u8bbe\u7f6e 1\uff08<code>flags &amp;= 0x01<\/code>\uff09\uff0c\u8868\u793a END_STREAM\uff0c\u8bf4\u660e\u8fd9\u4e2a Frame \u662f\u6d41\u7684\u6700\u540e\u4e00\u4e2a\u6570\u636e\u5305\u3002<\/p>\n<p><strong>R<\/strong>: \u4fdd\u7559\u4f4d\u3002<\/p>\n<p><strong>Stream Identifier<\/strong>: \u6d41 ID\uff0c\u5f53\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u5efa\u7acb TCP \u94fe\u63a5\u65f6\uff0c\u5c31\u4f1a\u5148\u53d1\u9001\u4e00\u4e2a Stream ID = 0 \u7684\u6d41\uff0c\u7528\u6765\u505a\u4e9b\u521d\u59cb\u5316\u5de5\u4f5c\u3002\u4e4b\u540e\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u4ece 1 \u5f00\u59cb\u53d1\u9001\u8bf7\u6c42\/\u54cd\u5e94\u3002<\/p>\n<p>Frame \u7531 Frame Header \u548c Frame Payload \u4e24\u90e8\u5206\u7ec4\u6210\u3002\u4e0d\u8bba\u662f\u539f\u6765\u7684 HTTP Header \u8fd8\u662f HTTP Body\uff0c\u5728 HTTP\/2 \u4e2d\uff0c\u90fd\u5c06\u8fd9\u4e9b\u6570\u636e\u5b58\u50a8\u5230 Frame Payload\uff0c\u7ec4\u6210\u4e00\u4e2a\u4e2a Frame\uff0c\u518d\u53d1\u9001\u54cd\u5e94\/\u8bf7\u6c42\u3002\u901a\u8fc7 Frame Header \u4e2d\u7684 Type \u533a\u5206\u8fd9\u4e2a Frame \u7684\u7c7b\u578b\u3002\u7531\u6b64\u53ef\u89c1\u8bed\u4e49\u5e76\u6ca1\u6709\u592a\u5927\u53d8\u5316\uff0c\u800c\u662f\u6570\u636e\u7684\u683c\u5f0f\u53d8\u6210\u4e8c\u8fdb\u5236\u7684 Frame\u3002\u4e8c\u8005\u7684\u8f6c\u6362\u548c\u5173\u7cfb\u5982\u4e0b\u56fe:<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/zerobox.org\/notes\/wp-content\/uploads\/2015\/05\/3cb89a9f5f04e9cbbd2416b1d187b835.png\" alt=\"HTTP\/1.x \u6570\u636e\u8f6c\u6362\u4e3a HTTP\/2\" \/><\/p>\n<p>\u56fe\u7247\u5f15\u7528\u81ea\u8fd9\u91cc<\/p>\n<h3 id=\"http2--hpackhttphttp2githubiohttp2-speccompressionhtml\">\u4e3a HTTP\/2 \u5934\u538b\u7f29\u4e13\u95e8\u8bbe\u8ba1\u7684 HPACK<\/h3>\n<p>\u5982\u679c\u6211\u4eec\u7ea6\u5b9a\u5c06\u5e38\u7528\u7684\u8bf7\u6c42\u6bd4\u5982 <code>GET \/index.html<\/code> \u7528\u4e00\u4e2a 1 \u6765\u8868\u793a\uff0c<code>POST \/index.html<\/code> \u7528 2 \u6765\u8868\u793a\u3002\u90a3\u4e48\u662f\u4e0d\u662f\u53ef\u4ee5\u8282\u7701\u5f88\u591a\u5b57\u8282\uff1f<\/p>\n<p>\u4e3a HTTP\/2 \u7684\u4e13\u95e8\u91cf\u8eab\u6253\u9020\u7684 HPACK \u4fbf\u662f\u7c7b\u4f3c\u8fd9\u6837\u7684\u601d\u8def\u5ef6\u4f38\u3002\u5b83\u4f7f\u7528\u4e00\u4efd\u7d22\u5f15\u8868\u6765\u5b9a\u4e49\u5e38\u7528\u7684 HTTP Header\u3002\u628a\u5e38\u7528\u7684 HTTP Header \u5b58\u653e\u5728\u8868\u91cc\u3002\u8bf7\u6c42\u7684\u65f6\u5019\u4fbf\u53ea\u9700\u8981\u53d1\u9001\u5728\u8868\u91cc\u7684\u7d22\u5f15\u4f4d\u7f6e\u5373\u53ef\u3002\u4f8b\u5982<code>:method=GET<\/code> \u4f7f\u7528\u7d22\u5f15\u503c 2 \u8868\u793a\uff0c<code>:path=\/index.html<\/code> \u4f7f\u7528\u7d22\u5f15\u503c 5 \u8868\u793a\uff08\u5b8c\u6574\u7684\u5217\u8868\u53c2\u8003\uff1aHPACK Static Table\uff09\u3002\u53ea\u8981\u7ed9\u670d\u52a1\u7aef\u53d1\u9001\u4e00\u4e2a Frame\uff0c\u8be5 Frame \u7684 Payload \u90e8\u5206\u5b58\u50a8 <code>0x8285<\/code>\uff0cFrame \u7684 Type \u8bbe\u7f6e\u4e3a Header \u7c7b\u578b\uff0c\u4fbf\u53ef\u8868\u793a\u8fd9\u4e2a Frame \u5c5e\u4e8e HTTP Header\uff0c\u8bf7\u6c42\u7684\u5185\u5bb9\u662f\uff1a<\/p>\n<pre><code>GET \/index.html\r\n<\/code><\/pre>\n<p>\u4e3a\u4ec0\u4e48\u662f <code>0x8285<\/code>\uff0c\u800c\u4e0d\u662f <code>0x0205<\/code>\uff1f \u8fd9\u662f\u56e0\u4e3a\u9ad8\u4f4d\u8bbe\u7f6e\u4e3a 1 \u8868\u793a\u8fd9\u4e2a\u5b57\u8282\u662f\u4e00\u4e2a\u5b8c\u5168\u7d22\u5f15\u503c\uff08key \u548c value \u90fd\u5728\u7d22\u5f15\u4e2d\uff09\u3002\u7c7b\u4f3c\u7684\uff0c\u901a\u8fc7\u9ad8\u4f4d\u7684\u6807\u5fd7\u4f4d\u53ef\u4ee5\u533a\u5206\u51fa\u8fd9\u4e2a\u5b57\u8282\u662f\u5c5e\u4e8e\u4e00\u4e2a\u5b8c\u5168\u7d22\u5f15\u503c\uff0c\u8fd8\u662f\u4ec5\u7d22\u5f15\u4e86 key\uff0c\u8fd8\u662f key \u548c value \u90fd\u6ca1\u6709\u7d22\u5f15\u3002\u56e0\u4e3a\u7d22\u5f15\u8868\u7684\u5927\u5c0f\u7684\u662f\u6709\u9650\u7684\uff0c\u5b83\u4ec5\u4fdd\u5b58\u4e86\u4e00\u4e9b\u5e38\u7528\u7684 HTTP Header\uff0c\u540c\u65f6\u6bcf\u6b21\u8bf7\u6c42\u8fd8\u53ef\u4ee5\u5728\u8868\u7684\u672b\u5c3e\u52a8\u6001\u8ffd\u52a0\u65b0\u7684 HTTP Header \u7f13\u5b58\u3002\u52a8\u6001\u90e8\u5206\u79f0\u4e4b\u4e3a Dynamic Table\u3002Static Table \u548c Dynamic Table \u5728\u4e00\u8d77\u7ec4\u5408\u6210\u4e86\u7d22\u5f15\u8868\uff1a<\/p>\n<pre><code>&lt;----------  Index Address Space ----------&gt;\r\n&lt;-- Static  Table --&gt;  &lt;-- Dynamic Table --&gt;\r\n+---+-----------+---+  +---+-----------+---+\r\n| 1 |    ...    | s |  |s+1|    ...    |s+k|\r\n+---+-----------+---+  +---+-----------+---+\r\n                       ^                   |\r\n                       |                   V\r\n                 Insertion Point      Dropping Point\r\n<\/code><\/pre>\n<p>HPACK \u4e0d\u4ec5\u4ec5\u901a\u8fc7\u7d22\u5f15\u952e\u503c\u5bf9\u6765\u964d\u4f4e\u6570\u636e\u91cf\uff0c\u540c\u65f6\u8fd8\u4f1a\u5c06\u5b57\u7b26\u4e32\u8fdb\u884c\u970d\u592b\u66fc\u7f16\u7801\u6765\u538b\u7f29\u5b57\u7b26\u4e32\u5927\u5c0f\u3002<\/p>\n<p>\u4ee5\u5e38\u7528\u7684 <code>User-Agent<\/code> \u4e3a\u4f8b\uff0c\u5b83\u5728\u9759\u6001\u8868\u4e2d\u7684\u7d22\u5f15\u503c\u662f 58\uff0c\u5b83\u7684\u503c\u662f\u4e0d\u5b58\u5728\u8868\u4e2d\u7684\uff0c\u56e0\u4e3a\u5b83\u7684\u503c\u662f\u591a\u53d8\u7684\u3002\u7b2c\u4e00\u6b21\u8bf7\u6c42\u7684\u65f6\u5019\u5b83\u7684 key \u7528 58 \u8868\u793a\uff0c\u8868\u793a\u8fd9\u662f\u4e00\u4e2a <code>User-Agent<\/code> \uff0c\u5b83\u7684\u503c\u90e8\u5206\u4f1a\u8fdb\u884c\u970d\u592b\u66fc\u7f16\u7801\uff08\u5982\u679c\u7f16\u7801\u540e\u7684\u5b57\u7b26\u4e32\u53d8\u66f4\u957f\u4e86\uff0c\u5219\u4e0d\u91c7\u7528\u970d\u592b\u66fc\u7f16\u7801\uff09\u3002\u670d\u52a1\u7aef\u6536\u5230\u8bf7\u6c42\u540e\uff0c\u4f1a\u5c06\u8fd9\u4e2a <code>User-Agent<\/code> \u6dfb\u52a0\u5230 Dynamic Table \u7f13\u5b58\u8d77\u6765\uff0c\u5206\u914d\u4e00\u4e2a\u65b0\u7684\u7d22\u5f15\u503c\u3002\u5ba2\u6237\u7aef\u4e0b\u4e00\u6b21\u8bf7\u6c42\u65f6\uff0c\u5047\u8bbe\u4e0a\u6b21\u8bf7\u6c42<code>User-Agent<\/code>\u7684\u5728\u8868\u4e2d\u7684\u7d22\u5f15\u4f4d\u7f6e\u662f 62\uff0c \u6b64\u65f6\u53ea\u9700\u8981\u53d1\u9001 <code>0xBE<\/code>\uff08\u540c\u6837\u7684\uff0c\u9ad8\u4f4d\u7f6e 1\uff09\uff0c\u4fbf\u53ef\u4ee5\u4ee3\u8868\uff1a <code>User-Agent: Mozilla\/5.0 (Windows NT 6.1; WOW64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/33.0.1750.146 Safari\/537.36<\/code>\u3002\u5176\u8fc7\u7a0b\u5982\u4e0b\u56fe\u6240\u793a:<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/zerobox.org\/notes\/wp-content\/uploads\/2015\/05\/935664e42d43fdfcc4ed367ae8053aac.png\" alt=\"HPACK \u539f\u7406\u56fe\" \/><\/p>\n<p>\u56fe\u7247\u5f15\u7528\u81ea\u8fd9\u91cc<\/p>\n<p>\u6700\u7ec8\uff0c\u76f8\u540c\u7684 Header \u53ea\u9700\u8981\u53d1\u9001\u7d22\u5f15\u503c\uff0c\u65b0\u7684 Header \u4f1a\u91cd\u65b0\u52a0\u5165 Dynamic Table\u3002<\/p>\n<h3 id=\"multipexing-\">Multipexing \u591a\u8def\u590d\u7528<\/h3>\n<p>\u6bcf\u4e2a Frame Header \u90fd\u6709\u4e00\u4e2a Stream ID \u5c31\u662f\u88ab\u7528\u4e8e\u5b9e\u73b0\u8be5\u7279\u6027\u3002\u6bcf\u6b21\u8bf7\u6c42\/\u54cd\u5e94\u4f7f\u7528\u4e0d\u540c\u7684 Stream ID\u3002\u5c31\u50cf\u540c\u4e00\u4e2a TCP \u94fe\u63a5\u4e0a\u7684\u6570\u636e\u5305\u901a\u8fc7 <code>IP:PORT<\/code>\u6765\u533a\u5206\u51fa\u6570\u636e\u5305\u53bb\u5f80\u54ea\u91cc\u4e00\u6837\u3002\u901a\u8fc7 Stream ID \u6807\u8bc6\uff0c\u6240\u6709\u7684\u8bf7\u6c42\u548c\u54cd\u5e94\u90fd\u53ef\u4ee5\u6b22\u5feb\u7684\u540c\u65f6\u8dd1\u5728\u4e00\u6761 TCP \u94fe\u63a5\u4e0a\u4e86\u3002 \u4e0b\u56fe\u662f http \u548c spdy(http2 \u7684\u6a21\u578b\u548c spdy \u662f\u7c7b\u4f3c\u7684) \u7684\u5e76\u53d1\u6a21\u578b\u5bf9\u6bd4\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/zerobox.org\/notes\/wp-content\/uploads\/2015\/05\/2ffcd986bb97b1051e47a874f006eb97.png\" alt=\"http\u5e76\u53d1\u6a21\u578b\" \/><\/p>\n<p>\u5f53\u6d41\u5e76\u53d1\u65f6\uff0c\u5c31\u4f1a\u6d89\u53ca\u5230\u6d41\u7684\u4f18\u5148\u7ea7\u548c\u4f9d\u8d56\u3002\u4f18\u5148\u7ea7\u9ad8\u7684\u6d41\u4f1a\u88ab\u4f18\u5148\u53d1\u9001\u3002\u56fe\u7247\u8bf7\u6c42\u7684\u4f18\u5148\u7ea7\u8981\u4f4e\u4e8e CSS \u548c SCRIPT\uff0c\u8fd9\u4e2a\u8bbe\u8ba1\u53ef\u4ee5\u786e\u4fdd\u91cd\u8981\u7684\u4e1c\u897f\u53ef\u4ee5\u88ab\u4f18\u5148\u52a0\u8f7d\u5b8c\u3002<\/p>\n<h3 id=\"server-push\">Server Push<\/h3>\n<p>\u5f53\u670d\u52a1\u7aef\u9700\u8981\u4e3b\u52a8\u63a8\u9001\u67d0\u4e2a\u8d44\u6e90\u65f6\uff0c\u4fbf\u4f1a\u53d1\u9001\u4e00\u4e2a Frame Type \u4e3a PUSH_PROMISE \u7684 Frame\uff0c\u91cc\u9762\u5e26\u4e86 PUSH \u9700\u8981\u65b0\u5efa\u7684 Stream ID\u3002\u610f\u601d\u662f\u544a\u8bc9\u5ba2\u6237\u7aef\uff1a\u63a5\u4e0b\u6765\u6211\u8981\u7528\u8fd9\u4e2a ID \u5411\u4f60\u53d1\u9001\u4e1c\u897f\uff0c\u5ba2\u6237\u7aef\u51c6\u5907\u597d\u63a5\u7740\u3002\u5ba2\u6237\u7aef\u89e3\u6790 Frame \u65f6\uff0c\u53d1\u73b0\u5b83\u662f\u4e00\u4e2a PUSH_PROMISE \u7c7b\u578b\uff0c\u4fbf\u4f1a\u51c6\u5907\u63a5\u6536\u670d\u52a1\u7aef\u8981\u63a8\u9001\u7684\u6d41\u3002<\/p>\n<p><strong>\u7ed3\u675f\u8bed<\/strong><\/p>\n<p>\u672c\u6587\u7b80\u5316\u4e86\u5f88\u591a HTTP\/2 \u534f\u8bae\u4e2d\u7684\u5177\u4f53\u7ec6\u8282\uff0c\u53ea\u63cf\u8ff0\u4e86 HTTP\/2 \u4e2d\u4e3b\u8981\u7279\u6027\u5b9e\u73b0\u7684\u57fa\u672c\u8fc7\u7a0b\u3002<\/p>\n<p>\u5982\u679c\u4f60\u60f3\u5b9e\u73b0\u4e00\u4e2a\u652f\u6301 HTTP\/2 \u7684\u670d\u52a1\u5668\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u79fb\u6b65 HTTP\/2 \u5b98\u7f51 \u505a\u66f4\u591a\u4e86\u89e3\uff0c\u5b83\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4efd\u5df2\u7ecf\u5b9e\u73b0 HTTP\/2 \u7684\u9879\u76ee\u5217\u8868\uff1ahttps:\/\/github.com\/http2\/http2-spec\/wiki\/Implementations \u3002<\/p>\n<p>\u53e6\u5916\uff0c\u5173\u4e8e HTTP\/2 \u6027\u80fd\u5982\u4f55\uff0c\u53ef\u4ee5\u53c2\u8003\u5b98\u65b9\u5c0f\u7ec4\u7ed9\u51fa\u7684\u4f8b\u5b50\uff1ahttps:\/\/http2.akamai.com\/demo\u3002<\/p>\n<p>UPYUN \u5728\u4e0d\u4e45\u7684\u5c06\u6765\u4e5f\u4f1a\u52a0\u5165\u5bf9 HTTP\/2 \u534f\u8bae\u652f\u6301\uff0c\u4e3a\u7528\u6237\u63d0\u4f9b\u66f4\u597d\u66f4\u5feb\u7684\u4e91\u52a0\u901f\u670d\u52a1\u3002<\/p>\n<h3 id=\"section\">\u5ef6\u4f38\u9605\u8bfb:<\/h3>\n<ul>\n<li>HTTP\/2 gitbook<\/li>\n<li>\u300aHigh Performance Browser Networking\u300b<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>\u6765\u6e90:http:\/\/io.upyun.com\/2015\/05\/13\/http2\/<\/p>\n","protected":false},"excerpt":{"rendered":"<p>HTTP\/2 \u6e90\u81ea SPDY\/2 SPDY \u7cfb\u5217\u534f\u8bae\u7531\u8c37\u6b4c\u5f00\u53d1\uff0c\u4e8e 2009 \u5e74 &hellip;<\/p>\n<p class=\"read-more\"><a href=\"http:\/\/zerobox.org\/notes\/1075.html\">\u7ee7\u7eed\u9605\u8bfb &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":1076,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[38],"class_list":["post-1075","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-http"],"views":347,"_links":{"self":[{"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/posts\/1075","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/comments?post=1075"}],"version-history":[{"count":0,"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/posts\/1075\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/media\/1076"}],"wp:attachment":[{"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/media?parent=1075"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/categories?post=1075"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/zerobox.org\/notes\/wp-json\/wp\/v2\/tags?post=1075"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}