2016-08-17 97 views
1

我想了解HTTP/2協議壓縮數據字段的方式。我沒有在rfc中找到算法。我知道它是一個二進制協議。 我正在尋找一種方法將二進制協議返回到人類可讀的內容。我認爲這是gzip就像寫在頭上,但它不是任何人有一個來源,我可以尋找二進制協議refernce?HTTP/2數據壓縮

Frame 55: 151 bytes on wire (1208 bits), 151 bytes captured (1208 bits) on interface 0 
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst:00:00:00_00:00:00 (00:00:00:00:00:00) 
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1 
Transmission Control Protocol, Src Port: 443 (443), Dst Port: 55300 (55300), Seq: 1087, Ack: 1078, Len: 85 
Secure Sockets Layer 
HyperText Transfer Protocol 2 
Stream: HEADERS, Stream ID: 13, Length 47 
    Length: 47 
    Type: HEADERS (1) 
    Flags: 0x04 
    0... .... .... .... .... .... .... .... = Reserved: 0x00000000 
    .000 0000 0000 0000 0000 0000 0000 1101 = Stream Identifier: 13 
    [Pad Length: 0] 
    Header Block Fragment: 8854012a5a839bd9ab5f87497ca589d34d1f5c0333333861... 
    [Header Length: 177] 
    [Header Count: 6] 
    Header: :status: 200 
    Header: access-control-allow-origin: * 
    Header: content-encoding: gzip 
    Header: content-type: text/html 
    Header: content-length: 338 
    Header: date: Wed, 17 Aug 2016 15:14:25 GMT 
    Padding: <MISSING> 

    Frame 56: 442 bytes on wire (3536 bits), 442 bytes captured (3536 bits) on interface 0 
    Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00) 
    Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1 
    Transmission Control Protocol, Src Port: 443 (443), Dst Port: 55300 (55300), Seq: 1172, Ack: 1078, Len: 376 
    Secure Sockets Layer 
    HyperText Transfer Protocol 2 
     Stream: DATA, Stream ID: 13, Length 338 
      Length: 338 
      Type: DATA (0) 
      Flags: 0x01 
      0... .... .... .... .... .... .... .... = Reserved: 0x00000000 
      .000 0000 0000 0000 0000 0000 0000 1101 = Stream Identifier: 13 
      [Pad Length: 0] 
      Data: 1f8b080000096e8800ff9cd2416b1b311005e0b3ffc5eb9e... 
      Padding: <MISSING> 
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HTTP/2不會添加數據有效負載的新壓縮,而是添加標頭。你顯然在RFC中看起來不夠努力(或者只是搜索「壓縮」):https://tools.ietf.org/html/rfc7540#ref-COMPRESSION鏈接到HPACK文檔。 –

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我知道標題壓縮是如何工作的,我對這一行感興趣Data:1f8b080000096e8800ff9cd2416b1b311005e0b3ffc5eb9e ...並且這不在標題中,所以hpack不在那裏使用,它不是gzip它是某種二進制格式,我想知道它是如何工作的 – dneyer

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'1f8b08'是gzip壓縮的初始字節,所以它是gzip。此外,響應標頭還說'content-encoding:gzip',所以DATA框架包含了gzip的響應主體。 – sbordet

回答

4
一個

HTTP/2響應的響應體被壓縮(或不),正是因爲它的工作原理與HTTP/1相同的方式:在響應所述請求和Content-Encoding:Accept-Encoding:。 HTTP/2沒有對身體進行壓縮,只是在HTTP/1中根本沒有壓縮的頭文件。

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確實。有一個數據壓縮提案,[但它被刪除](https://github.com/http2/http2-spec/commit/d5a8faeaa605bdff7b96287d72913b4b742104cf)。 – GreenReaper