Shadowsocks Improvement Proposal 001

SIP001 - Allow header obfuscating to cheat on QoS.

Recently, QoS of some ISPs becomes unreasonable. A cheap way to solve this problem is header obfuscating, which inserts some fake headers before shadowsocks handshake packets.

For example, before a shadowsocks request, we insert this HTTP GET header:

    POST / HTTP/1.1\r\n
    Host: www.baidu.com:8388\r\n
    User-Agent: curl/7.45.1\r\n
    Accept: */*\r\n
    Content-Type: application/octet-stream\r\n
    Content-Length: 176\r\n
    \r\n

Similarly, we insert this HTTP header before a shadowsocks response.

    HTTP/1.1 200 OK\r\n
    Server: nginx/1.0.2\r\n
    Date: Tue, 13 Dec 2016 13:25:12 GMT\r\n
    Content-Type: application/octet-stream\r\n
    Content-Length: 176\r\n
    Connection: keep-alive\r\n
    Cache-Control: private, no-cache, no-store, proxy-revalidate, no-transform\r\n
    Pragma: no-cache\r\n
    \r\n

With this SIP, we may cheat on most of QoS mechanisms, avoiding QoS related packets dropping or bandwidth limit.

A demonstration can be found here: https://github.com/shadowsocks/shadowsocks-libev/tree/obfs

Any suggestion is welcome.