9. 用Rust手把手编写一个wmproxy(代理，内网穿透等), HTTP2改造篇之HPACK示例, 了解http2头信息如何处理

项目 ++wmproxy++

github: https://github.com/tickbh/wmproxy

关于HPACK相关数据的示例

长度编码的示例，用5位的前缀示例

将10进行编码，10小于2^5-1，故

   0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| X | X | X | 0 | 1 | 0 | 1 | 0 |   10 stored on 5 bits
+---+---+---+---+---+---+---+---+

将1337进行编码

1337大于2^5-1，故前5位填充

   0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| X | X | X | 1 | 1 | 1 | 1 | 1 |  31
+---+---+---+---+---+---+---+---+

1337 - 31 = 1306，大于128，故需要二次填充，用1306 mod 128 = 21，首位填充1，故8位填充为，当前偏移值为7

   0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| 1 | 0 | 0 | 1 | 1 | 0 | 1 | 0 |  26
+---+---+---+---+---+---+---+---+

对1301-21=1280，1280 / 128 = 10， 10 < 128，故已经完成，首位填0

   0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 |  10
+---+---+---+---+---+---+---+---+

最终的填充值：

   0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| X | X | X | 1 | 1 | 1 | 1 | 1 |  Prefix = 31, I = 1306
| 1 | 0 | 0 | 1 | 1 | 0 | 1 | 0 |  1306>=128, encode(154), I=1306/128
| 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 |  10<128, encode(10), done
+---+---+---+---+---+---+---+---+

头部编码示例

在静态列表中索引

以下待索引的值

 :method: GET

十六进制表示值82，二进制表示10000010，表示取静态表2的值，查表为(:method, GET)

不在列表中，但请求索引，未使用HUFFMAN

以下示例

 custom-key: custom-header

十六进制表示

 400a 6375 7374 6f6d 2d6b 6579 0d63 7573 | @.custom-key.cus
746f 6d2d 6865 6164 6572                | tom-header

解码过程

 40                                      | == 01开头请求索引 ==
0a                                      |   name (长度 10)
6375 7374 6f6d 2d6b 6579                | custom-key
0d                                      |   value (长度 13)
6375 7374 6f6d 2d68 6561 6465 72        | custom-header
                                        | -> custom-key:
                                        |   custom-header

动态表 (解码之后):

[ 1] (占用 55) custom-key: custom-header
占用长度: 10+13+32=55

名字在列表中，但不索引，未使用HUFFMAN

以下示例

 :path: /sample/path

十六进制表示

 040c 2f73 616d 706c 652f 7061 7468      | ../sample/path

解码过程

 04                                      | == 0000开头，请求不索引 ==
                                        |   name从索引取 (idx = 4)
                                        |   值为:path
0c                                      |   value (长度12)
2f73 616d 706c 652f 7061 7468           | /sample/path
                                        | -> :path: /sample/path

永不索引，未使用HUFFMAN

以下示例

 password: secret

十六进制表示

 1008 7061 7373 776f 7264 0673 6563 7265 | ..password.secre
74                                      | t

解码过程

 10                                      | == 0001开头不索引 ==
08                                      |   name (长度8)
7061 7373 776f 7264                     | password
06                                      |   value (长度6)
7365 6372 6574                          | secret
                                        | -> password: secret

完整的请求示例，不使用HUFFMAN

以下几个示例将连接请求，后续的会用到前面的动态列表

第一次请求. 示例如下

 :method: GET
:scheme: http
:path: /
:authority: www.example.com

十六进制表示

 8286 8441 0f77 7777 2e65 7861 6d70 6c65 | ...A.www.example
2e63 6f6d                               | .com

解码过程

  
82                                      | == Indexed - 静态表 ==
                                        |   idx = 2
                                        | -> :method: GET
86                                      | == Indexed - 静态表 ==
                                        |   idx = 6
                                        | -> :scheme: http
84                                      | == Indexed - 静态表 ==
                                        |   idx = 4
                                        | -> :path: /
41                                      | == 01开头请求索引 indexed ==
                                        |   Indexed name (idx = 1)
                                        |     :authority
0f                                      |   Literal value (长度15)
7777 772e 6578 616d 706c 652e 636f 6d   | www.example.com
                                        | -> :authority: 
                                        |   www.example.com

动态列表 (解码后):

[ 1->62] (s = 57) :authority: www.example.com
列表长度: 57

第二次请求. 示例如下，新加了cache-control字段，其它和第一次一样

 :method: GET
:scheme: http
:path: /
:authority: www.example.com
cache-control: no-cache

十六进制表示

 8286 84be 5808 6e6f 2d63 6163 6865      | ....X.no-cache

解码过程

 82                                      | == Indexed - 静态表 ==
                                        |   idx = 2
                                        | -> :method: GET
86                                      | == Indexed - 静态表 ==
                                        |   idx = 6
                                        | -> :scheme: http
84                                      | == Indexed - 静态表 ==
                                        |   idx = 4
                                        | -> :path: /
be                                      | == Indexed - 动态表，索引值62及以上的为动态表 ==
                                        |   idx = 62
                                        | -> :authority:
                                        |   www.example.com
58                                      | == Literal indexed ==
                                        |   Indexed name (idx = 24)
                                        |     cache-control
08                                      |   Literal value (8)
6e6f 2d63 6163 6865                     | no-cache
                                        | -> cache-control: no-cache

动态列表 (解码后):

[ 1->62] (s = 53) cache-control: no-cache
[ 2->63] (s = 57) :authority: www.example.com
总长度: 110

第三次请求. 示例如下

 :method: GET
:scheme: https
:path: /index.html
:authority: www.example.com
custom-key: custom-value

十六进制表示

 8287 85bf 400a 6375 7374 6f6d 2d6b 6579 | ....@.custom-key
0c63 7573 746f 6d2d 7661 6c75 65        | .custom-value

解码过程

 82                                      | == Indexed - 静态表 ==
                                        |   idx = 2
                                        | -> :method: GET
87                                      | == Indexed - 静态表 ==
                                        |   idx = 7
                                        | -> :scheme: https
85                                      | == Indexed - 静态表 ==
                                        |   idx = 5
                                        | -> :path: /index.html
bf                                      | == Indexed - 动态表 ==
                                        |   idx = 63
                                        | -> :authority:
                                        |   www.example.com
40                                      | == Literal indexed ==
0a                                      |   Literal name (长度10)
6375 7374 6f6d 2d6b 6579                | custom-key
0c                                      |   Literal value (长度12)
6375 7374 6f6d 2d76 616c 7565           | custom-value
                                        | -> custom-key:
                                        |   custom-value

动态列表 (解码后):

[ 1->62] (s = 54) custom-key: custom-value
[ 2->63] (s = 53) cache-control: no-cache
[ 3->64] (s = 57) :authority: www.example.com
总长度: 164

完整的请求示例（和上述例子一模一样，但是使用HUFFMAN)

以下几个示例将连接请求，后续的会用到前面的动态列表

第一次请求. 示例如下

 :method: GET
:scheme: http
:path: /
:authority: www.example.com

十六进制表示

 8286 8441 8cf1 e3c2 e5f2 3a6b a0ab 90f4 | ...A......:k....
ff                                      | .

比之前少了3字节

解码过程

 82                                      | == Indexed - 静态表 ==
                                        |   idx = 2
                                        | -> :method: GET
86                                      | == Indexed - 静态表 ==
                                        |   idx = 6
                                        | -> :scheme: http
84                                      | == Indexed - 静态表 ==
                                        |   idx = 4
                                        | -> :path: /
41                                      | == Literal indexed ==
                                        |   Indexed name (idx = 1)
                                        |     :authority
8c                                      |   Literal value (长度12)
                                        |     Huffman encoded:
f1e3 c2e5 f23a 6ba0 ab90 f4ff           | .....:k.....
                                        |     Decoded:
                                        | www.example.com
                                        | -> :authority:
                                        |   www.example.com

动态列表 (解码后):

 [  1->62] (s =  57) :authority: www.example.com
      列表长度:  57

第二次请求. 示例如下，新加了cache-control字段，其它和第一次一样

 :method: GET
:scheme: http
:path: /
:authority: www.example.com
cache-control: no-cache

十六进制表示

 8286 84be 5886 a8eb 1064 9cbf           | ....X....d..

比之前少了2字节

解码过程

 82                                      | == Indexed - 静态表 ==
                                        |   idx = 2
                                        | -> :method: GET
86                                      | == Indexed - 静态表 ==
                                        |   idx = 6
                                        | -> :scheme: http
84                                      | == Indexed - 静态表 ==
                                        |   idx = 4
                                        | -> :path: /
be                                      | == Indexed - 动态表 ==
                                        |   idx = 62
                                        | -> :authority:
                                        |   www.example.com
58                                      | == Literal indexed ==
                                        |   Indexed name (idx = 24)
                                        |     cache-control
86                                      |   Literal value (长度6)
                                        |     Huffman encoded:
a8eb 1064 9cbf                          | ...d..
                                        |     Decoded:
                                        | no-cache
                                        | -> cache-control: no-cache

动态列表 (解码后):

 [  1->62] (s =  53) cache-control: no-cache
[  2->63] (s =  57) :authority: www.example.com
      列表长度: 110

第三次请求. 示例如下

 :method: GET
:scheme: https
:path: /index.html
:authority: www.example.com
custom-key: custom-value

十六进制表示

 8287 85bf 4088 25a8 49e9 5ba9 7d7f 8925 | ....@.%.I.[.}..%
a849 e95b b8e8 b4bf                     | .I.[....

比之前少了5字节

解码过程

 82                                      | == Indexed - 静态表 ==
                                        |   idx = 2
                                        | -> :method: GET
87                                      | == Indexed - 静态表 ==
                                        |   idx = 7
                                        | -> :scheme: https
85                                      | == Indexed - 静态表 ==
                                        |   idx = 5
                                        | -> :path: /index.html
bf                                      | == Indexed - 动态表 ==
                                        |   idx = 63
                                        | -> :authority:
                                        |   www.example.com
40                                      | == Literal indexed ==
88                                      |   Literal name (长度8)
                                        |     Huffman encoded:
25a8 49e9 5ba9 7d7f                     | %.I.[.}.
                                        |     Decoded:
                                        | custom-key
89                                      |   Literal value (长度9)
                                        |     Huffman encoded:
25a8 49e9 5bb8 e8b4 bf                  | %.I.[....
                                        |     Decoded:
                                        | custom-value
                                        | -> custom-key:
                                        |   custom-value

动态列表 (解码后):

 [  1->62] (s =  54) custom-key: custom-value
[  2->63] (s =  53) cache-control: no-cache
[  3->64] (s =  57) :authority: www.example.com
      总长度: 164

HUFFMAN编码在于首次如果数据较大的时候优势会更加明显，如果数据较小，或者在后续的时候与普通编码命中索引时基本一致。

完整的返回示例(HUFFMAN)

HUFFMAN与普通的差别在于字符串编解码时的差别，这里只介绍一种，并且设置SETTINGS_HEADER_TABLE_SIZE为256

以下几个示例将连接请求，后续的会用到前面的动态列表

第一次返回. 示例如下

 :status: 302
cache-control: private
date: Mon, 21 Oct 2013 20:13:21 GMT
location: https://www.example.com

十六进制表示

 4882 6402 5885 aec3 771a 4b61 96d0 7abe | H.d.X...w.Ka..z.
9410 54d4 44a8 2005 9504 0b81 66e0 82a6 | ..T.D. .....f...
2d1b ff6e 919d 29ad 1718 63c7 8f0b 97c8 | -..n..)...c.....
e9ae 82ae 43d3                          | ....C.

解码过程

  
48                                      | == Literal indexed ==
                                        |   Indexed name (idx = 8)
                                        |     :status
82                                      |   Literal value (长度2)
                                        |     Huffman encoded:
6402                                    | d.
                                        |     Decoded:
                                        | 302
                                        | -> :status: 302
58                                      | == Literal indexed ==
                                        |   Indexed name (idx = 24)
                                        |     cache-control
85                                      |   Literal value (长度5)
                                        |     Huffman encoded:
aec3 771a 4b                            | ..w.K
                                        |     Decoded:
                                        | private
                                        | -> cache-control: private
61                                      | == Literal indexed ==
                                        |   Indexed name (idx = 33)
                                        |     date
96                                      |   Literal value (长度22)
                                        |     Huffman encoded:
d07a be94 1054 d444 a820 0595 040b 8166 | .z...T.D. .....f
e082 a62d 1bff                          | ...-..
                                        |     Decoded:
                                        | Mon, 21 Oct 2013 20:13:21
                                        | GMT
                                        | -> date: Mon, 21 Oct 2013
                                        |   20:13:21 GMT
6e                                      | == Literal indexed ==
                                        |   Indexed name (idx = 46)
                                        |     location
91                                      |   Literal value (长度17)
                                        |     Huffman encoded:
9d29 ad17 1863 c78f 0b97 c8e9 ae82 ae43 | .)...c.........C
d3                                      | .
                                        |     Decoded:
                                        | https://www.example.com
                                        | -> location:
                                        |   https://www.example.com

动态列表 (解码后):

 [  1->62] (s =  63) location: https://www.example.com
[  2->63] (s =  65) date: Mon, 21 Oct 2013 20:13:21 GMT
[  3->64] (s =  52) cache-control: private
[  4->65] (s =  42) :status: 302
      Table size: 222

第二次请求. 示例如下，只是状态码发生了变更

 :status: 307
cache-control: private
date: Mon, 21 Oct 2013 20:13:21 GMT
location: https://www.example.com

十六进制表示

 4883 640e ffc1 c0bf                     | H.d.....

解码过程

  
48                                      | == Literal indexed ==
                                        |   Indexed name (idx = 8)
                                        |     :status
83                                      |   Literal value (长度3)
                                        |     Huffman encoded:
640e ff                                 | d..
                                        |     Decoded:
                                        | 307
                                        | - evict: :status: 302
                                        | -> :status: 307
c1                                      | == Indexed - Add ==
                                        |   idx = 65
                                        | -> cache-control: private
c0                                      | == Indexed - Add ==
                                        |   idx = 64
                                        | -> date: Mon, 21 Oct 2013
                                        |   20:13:21 GMT
bf                                      | == Indexed - Add ==
                                        |   idx = 63
                                        | -> location:
                                        |   https://www.example.com

动态列表 (解码后):

 [  1->62] (s =  42) :status: 307
[  2->63] (s =  63) location: https://www.example.com
[  3->64] (s =  65) date: Mon, 21 Oct 2013 20:13:21 GMT
[  4->65] (s =  52) cache-control: private
      Table size: 222

由于(:status, 302)的长度为42，且42+222=264>256，所以舍弃最大值

第三次请求. 示例如下

 :status: 200
cache-control: private
date: Mon, 21 Oct 2013 20:13:22 GMT
location: https://www.example.com
content-encoding: gzip
set-cookie: foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU; max-age=3600; version=1

十六进制表示

 88c1 6196 d07a be94 1054 d444 a820 0595 | ..a..z...T.D. ..
040b 8166 e084 a62d 1bff c05a 839b d9ab | ...f...-...Z....
77ad 94e7 821d d7f2 e6c7 b335 dfdf cd5b | w..........5...[
3960 d5af 2708 7f36 72c1 ab27 0fb5 291f | 9`..'..6r..'..).
9587 3160 65c0 03ed 4ee5 b106 3d50 07   | ..1`e...N...=P.

比之前少了5字节

解码过程

  
88                                      | == Indexed - 静态表 ==
                                        |   idx = 8
                                        | -> :status: 200
c1                                      | == Indexed - 动态表 ==
                                        |   idx = 65
                                        | -> cache-control: private
61                                      | == Literal indexed ==
                                        |   Indexed name (idx = 33)
                                        |     date
96                                      |   Literal value (长度22)
                                        |     Huffman encoded:
d07a be94 1054 d444 a820 0595 040b 8166 | .z...T.D. .....f
e084 a62d 1bff                          | ...-..
                                        |     Decoded:
                                        | Mon, 21 Oct 2013 20:13:22
                                        | GMT
                                        | - evict: cache-control:
                                        |   private
                                        | -> date: Mon, 21 Oct 2013 
                                        |   20:13:22 GMT
c0                                      | == Indexed - Add ==
                                        |   idx = 64
                                        | -> location:
                                        |   https://www.example.com
5a                                      | == Literal indexed ==
                                        |   Indexed name (idx = 26)
                                        |     content-encoding
83                                      |   Literal value (长度3)
                                        |     Huffman encoded:
9bd9 ab                                 | ...
                                        |     Decoded:
                                        | gzip
                                        | - evict: date: Mon, 21 Oct
                                        |    2013 20:13:21 GMT
                                        | -> content-encoding: gzip
77                                      | == Literal indexed ==
                                        |   Indexed name (idx = 55)
                                        |     set-cookie
ad                                      |   Literal value (长度45)
                                        |     Huffman encoded:
94e7 821d d7f2 e6c7 b335 dfdf cd5b 3960 | .........5...[9`
d5af 2708 7f36 72c1 ab27 0fb5 291f 9587 | ..'..6r..'..)...
3160 65c0 03ed 4ee5 b106 3d50 07        | 1`e...N...=P.
                                        |     Decoded:
                                        | foo=ASDJKHQKBZXOQWEOPIUAXQ
                                        | WEOIU; max-age=3600; versi
                                        | on=1
                                        | - evict: location:
                                        |   https://www.example.com
                                        | - evict: :status: 307
                                        | -> set-cookie: foo=ASDJKHQ
                                        |   KBZXOQWEOPIUAXQWEOIU; ma
                                        |   x-age=3600; version=1

动态列表 (解码后):

 [  1->62] (s =  98) set-cookie: foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU;
                 max-age=3600; version=1
[  2->63] (s =  52) content-encoding: gzip
[  3->64] (s =  65) date: Mon, 21 Oct 2013 20:13:22 GMT
总长度: 215

动态列表保留着一个最大的缓存大小值，每一个键值对的计算为name的字节数+value的字节数+32为确定的大小值。超出大小部分则丢弃不缓存，默认大小为4096。

总结

HPACK管理着HTTP2的头部的协议部分，有着高压缩比和重复请求的高复用性，双方编码解码需要各自维持一份动态表，动态根据处理数据来动态拓展，保证双方维持的表一模一样。从而保证ID索引不会乱。Huffman编码把头里面需要用到字符串的数据进行进一步的压缩，相对来说整个过程复杂度比HTTP1高很多，但相对的对使用者完全透明，在不影响其使用的情况下提高传输效率，并减少带宽的使用量。

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原文地址：https://www.cnblogs.com/luojiawaf/p/17750621.html

	0 1 2 3 4 5 6 7
	+---+---+---+---+---+---+---+---+
	\| X \| X \| X \| 0 \| 1 \| 0 \| 1 \| 0 \| 10 stored on 5 bits
	+---+---+---+---+---+---+---+---+

	0 1 2 3 4 5 6 7
	+---+---+---+---+---+---+---+---+
	\| X \| X \| X \| 1 \| 1 \| 1 \| 1 \| 1 \| 31
	+---+---+---+---+---+---+---+---+

	0 1 2 3 4 5 6 7
	+---+---+---+---+---+---+---+---+
	\| 1 \| 0 \| 0 \| 1 \| 1 \| 0 \| 1 \| 0 \| 26
	+---+---+---+---+---+---+---+---+

	0 1 2 3 4 5 6 7
	+---+---+---+---+---+---+---+---+
	\| 0 \| 0 \| 0 \| 0 \| 1 \| 0 \| 1 \| 0 \| 10
	+---+---+---+---+---+---+---+---+

	0 1 2 3 4 5 6 7
	+---+---+---+---+---+---+---+---+
	\| X \| X \| X \| 1 \| 1 \| 1 \| 1 \| 1 \| Prefix = 31, I = 1306
	\| 1 \| 0 \| 0 \| 1 \| 1 \| 0 \| 1 \| 0 \| 1306>=128, encode(154), I=1306/128
	\| 0 \| 0 \| 0 \| 0 \| 1 \| 0 \| 1 \| 0 \| 10<128, encode(10), done
	+---+---+---+---+---+---+---+---+

	400a 6375 7374 6f6d 2d6b 6579 0d63 7573 \| @.custom-key.cus
	746f 6d2d 6865 6164 6572 \| tom-header

	40 \| == 01开头请求索引 ==
	0a \| name (长度 10)
	6375 7374 6f6d 2d6b 6579 \| custom-key
	0d \| value (长度 13)
	6375 7374 6f6d 2d68 6561 6465 72 \| custom-header
	\| -> custom-key:
	\| custom-header

	04 \| == 0000开头，请求不索引 ==
	\| name从索引取 (idx = 4)
	\| 值为:path
	0c \| value (长度12)
	2f73 616d 706c 652f 7061 7468 \| /sample/path
	\| -> :path: /sample/path

	1008 7061 7373 776f 7264 0673 6563 7265 \| ..password.secre
	74 \| t

	10 \| == 0001开头不索引 ==
	08 \| name (长度8)
	7061 7373 776f 7264 \| password
	06 \| value (长度6)
	7365 6372 6574 \| secret
	\| -> password: secret

	:method: GET
	:scheme: http
	:path: /
	:authority: www.example.com

	8286 8441 0f77 7777 2e65 7861 6d70 6c65 \| ...A.www.example
	2e63 6f6d \| .com


	82 \| == Indexed - 静态表 ==
	\| idx = 2
	\| -> :method: GET
	86 \| == Indexed - 静态表 ==
	\| idx = 6
	\| -> :scheme: http
	84 \| == Indexed - 静态表 ==
	\| idx = 4
	\| -> :path: /
	41 \| == 01开头请求索引 indexed ==
	\| Indexed name (idx = 1)
	\| :authority
	0f \| Literal value (长度15)
	7777 772e 6578 616d 706c 652e 636f 6d \| www.example.com
	\| -> :authority:
	\| www.example.com

	:method: GET
	:scheme: https
	:path: /index.html
	:authority: www.example.com
	custom-key: custom-value

	8287 85bf 400a 6375 7374 6f6d 2d6b 6579 \| ....@.custom-key
	0c63 7573 746f 6d2d 7661 6c75 65 \| .custom-value

	8286 8441 8cf1 e3c2 e5f2 3a6b a0ab 90f4 \| ...A......:k....
	ff \| .

	[ 1->62] (s = 57) :authority: www.example.com
	列表长度: 57

	[ 1->62] (s = 53) cache-control: no-cache
	[ 2->63] (s = 57) :authority: www.example.com
	列表长度: 110

	8287 85bf 4088 25a8 49e9 5ba9 7d7f 8925 \| ....@.%.I.[.}..%
	a849 e95b b8e8 b4bf \| .I.[....

	[ 1->62] (s = 54) custom-key: custom-value
	[ 2->63] (s = 53) cache-control: no-cache
	[ 3->64] (s = 57) :authority: www.example.com
	总长度: 164

	:status: 302
	cache-control: private
	date: Mon, 21 Oct 2013 20:13:21 GMT
	location: https://www.example.com

	4882 6402 5885 aec3 771a 4b61 96d0 7abe \| H.d.X...w.Ka..z.
	9410 54d4 44a8 2005 9504 0b81 66e0 82a6 \| ..T.D. .....f...
	2d1b ff6e 919d 29ad 1718 63c7 8f0b 97c8 \| -..n..)...c.....
	e9ae 82ae 43d3 \| ....C.


	48 \| == Literal indexed ==
	\| Indexed name (idx = 8)
	\| :status
	82 \| Literal value (长度2)
	\| Huffman encoded:
	6402 \| d.
	\| Decoded:
	\| 302
	\| -> :status: 302
	58 \| == Literal indexed ==
	\| Indexed name (idx = 24)
	\| cache-control
	85 \| Literal value (长度5)
	\| Huffman encoded:
	aec3 771a 4b \| ..w.K
	\| Decoded:
	\| private
	\| -> cache-control: private
	61 \| == Literal indexed ==
	\| Indexed name (idx = 33)
	\| date
	96 \| Literal value (长度22)
	\| Huffman encoded:
	d07a be94 1054 d444 a820 0595 040b 8166 \| .z...T.D. .....f
	e082 a62d 1bff \| ...-..
	\| Decoded:
	\| Mon, 21 Oct 2013 20:13:21
	\| GMT
	\| -> date: Mon, 21 Oct 2013
	\| 20:13:21 GMT
	6e \| == Literal indexed ==
	\| Indexed name (idx = 46)
	\| location
	91 \| Literal value (长度17)
	\| Huffman encoded:
	9d29 ad17 1863 c78f 0b97 c8e9 ae82 ae43 \| .)...c.........C
	d3 \| .
	\| Decoded:
	\| https://www.example.com
	\| -> location:
	\| https://www.example.com

	[ 1->62] (s = 63) location: https://www.example.com
	[ 2->63] (s = 65) date: Mon, 21 Oct 2013 20:13:21 GMT
	[ 3->64] (s = 52) cache-control: private
	[ 4->65] (s = 42) :status: 302
	Table size: 222

	:status: 307
	cache-control: private
	date: Mon, 21 Oct 2013 20:13:21 GMT
	location: https://www.example.com

	[ 1->62] (s = 42) :status: 307
	[ 2->63] (s = 63) location: https://www.example.com
	[ 3->64] (s = 65) date: Mon, 21 Oct 2013 20:13:21 GMT
	[ 4->65] (s = 52) cache-control: private
	Table size: 222

	:status: 200
	cache-control: private
	date: Mon, 21 Oct 2013 20:13:22 GMT
	location: https://www.example.com
	content-encoding: gzip
	set-cookie: foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU; max-age=3600; version=1

	88c1 6196 d07a be94 1054 d444 a820 0595 \| ..a..z...T.D. ..
	040b 8166 e084 a62d 1bff c05a 839b d9ab \| ...f...-...Z....
	77ad 94e7 821d d7f2 e6c7 b335 dfdf cd5b \| w..........5...[
	3960 d5af 2708 7f36 72c1 ab27 0fb5 291f \| 9`..'..6r..'..).
	9587 3160 65c0 03ed 4ee5 b106 3d50 07 \| ..1`e...N...=P.


	88 \| == Indexed - 静态表 ==
	\| idx = 8
	\| -> :status: 200
	c1 \| == Indexed - 动态表 ==
	\| idx = 65
	\| -> cache-control: private
	61 \| == Literal indexed ==
	\| Indexed name (idx = 33)
	\| date
	96 \| Literal value (长度22)
	\| Huffman encoded:
	d07a be94 1054 d444 a820 0595 040b 8166 \| .z...T.D. .....f
	e084 a62d 1bff \| ...-..
	\| Decoded:
	\| Mon, 21 Oct 2013 20:13:22
	\| GMT
	\| - evict: cache-control:
	\| private
	\| -> date: Mon, 21 Oct 2013
	\| 20:13:22 GMT
	c0 \| == Indexed - Add ==
	\| idx = 64
	\| -> location:
	\| https://www.example.com
	5a \| == Literal indexed ==
	\| Indexed name (idx = 26)
	\| content-encoding
	83 \| Literal value (长度3)
	\| Huffman encoded:
	9bd9 ab \| ...
	\| Decoded:
	\| gzip
	\| - evict: date: Mon, 21 Oct
	\| 2013 20:13:21 GMT
	\| -> content-encoding: gzip
	77 \| == Literal indexed ==
	\| Indexed name (idx = 55)
	\| set-cookie
	ad \| Literal value (长度45)
	\| Huffman encoded:
	94e7 821d d7f2 e6c7 b335 dfdf cd5b 3960 \| .........5...[9`
	d5af 2708 7f36 72c1 ab27 0fb5 291f 9587 \| ..'..6r..'..)...
	3160 65c0 03ed 4ee5 b106 3d50 07 \| 1`e...N...=P.
	\| Decoded:
	\| foo=ASDJKHQKBZXOQWEOPIUAXQ
	\| WEOIU; max-age=3600; versi
	\| on=1
	\| - evict: location:
	\| https://www.example.com
	\| - evict: :status: 307
	\| -> set-cookie: foo=ASDJKHQ
	\| KBZXOQWEOPIUAXQWEOIU; ma
	\| x-age=3600; version=1

	[ 1->62] (s = 98) set-cookie: foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU;
	max-age=3600; version=1
	[ 2->63] (s = 52) content-encoding: gzip
	[ 3->64] (s = 65) date: Mon, 21 Oct 2013 20:13:22 GMT
	总长度: 215