The SPDY Book (for jay muratore) by Chris Strom

Author:Chris Strom [Strom, Chris]
Language: eng
Format: epub

6.2.2. Server Response (SYN_REPLY)

The server response packet looks very much like the request. A SYN_REPLY is primarily distinguished from the initiating SYN_STREAM by the Type value, which is 0x02 for a SYN_REPLY.

+----------------------------------+ 80 02 00 02 |1| Version | Type | +----------------------------------+ 00 00 00 a4 | Flags (8) | Length (24 bits) | +----------------------------------+ 00 00 00 01 |X| Stream-ID (31bits) | +----------------------------------+ 00 00 78 bb | Unused | | df a2 51 b2 +---------------- | 62 e0 64 e0 | Name/value header block | 42 c4 10 03 | ... | 57 76 6a 6a ...

The SYN_REPLY retains the stream ID of the SYN_STREAM that initiated the connection. Aside from that, the SYN_REPLY is very similar to the SYN_STREAM to which it is responding.

The decompressed contents of the name/value block, should be familiar to anyone that has ever viewed an HTTP response:

\u0000 \t \u0000 \n connection \u0000 \n keep-alive \u0000 \u000e content-length \u0000 \u0003 698 \u0000 \r cache-control \u0000 \u0011 public, max-age=0 \u0000 \r last-modified \u0000 \u001d Sat, 14 May 2011 02:36:14 GMT \u0000 \u0004 etag \u0000 \u0013 "698-1305340574000" \u0000 \f content-type \u0000 \u0018 text/html; charset=UTF-8 \u0000 \r accept-ranges \u0000 \u0005 bytes \u0000 \u0006 status \u0000 \u0006 200 OK \u0000 \u0007 version \u0000\bHTTP/1.1

But no data has been sent yet! This is just a handshake with some optional headers describing the reply itself (none of the to-be-pushed resources).

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