Chrome-Data-Compression-Proxy-Standalone-Python

A Python wrapper of Chrome DCP.

Inspired by datacompressionproxy(https://code.google.com/p/datacompressionproxy/), and Sogou proxy(http://xiaoxia.org/2011/11/14/update-sogou-proxy-program-with-https-support/).

Details of Chrome DCP:

https://developer.chrome.com/multidevice/data-compression

https://support.google.com/chrome/answer/3517349?hl=en

Known Limits

• DOES NOT WORK WITH HTTPS: Google does not pass HTTPS traffic with DCP. The only way to do that is do a MITM by yourself, which is obviously terrible. You can use the PAC file to redirect HTTPS traffic to DIRECT though.
• Only works with Python 2.7.9+: I need SSLContext. Especially when you are using OSX, you need to get the latest Python by yourself. More about it: https://stackoverflow.com/questions/28228214/ssl-module-object-has-no-attribute-sslcontext
• Could be not working with large files.
• Your network admin can FORCE you to use the HTTP version of this proxy, so they can look into your traffic. I am giving an warning if that happens, but this code is NOT tested to make sure it is safe from attacks including but not limited to SSLStrip. Use at your own risk.
• As Google Global Cache can be located in your ISP's data center, you should expect NO PRIVACY of your traffic with this proxy.

Usage

python proxy.py (-p 8080) (-m HTTPS) (-i 127.0.0.1)

-p: Default: 8080
    The port this proxy is listening on.

-m: Default: HTTPS
    The mode, HTTPS or HTTP. If not set, the proxy will try HTTPS, and fall back to HTTP should required.

-i: Default: ''
    The IP address this proxy is listening on.

Requirement

• Python 2.7.9+
• ssl package, as in openssl
• Highly recommended: Proxy SwitchyOmega (https://github.com/FelisCatus/SwitchyOmega) or alternatives.

Author

Beining, http://www.cnbeining.com/ .

The header algorithm comes from datacompressionproxy, https://code.google.com/p/datacompressionproxy/ , License: Apache 2.0. Author: jerzyglowacki, http://www.niute.ch/ .

The main part comes from Sogou Proxy, http://xiaoxia.org/2011/11/14/update-sogou-proxy-program-with-https-support/ . Author: Xiaoxia, http://xiaoxia.org .

License

GPLv2.

This program is provided as is, with absolutely no warranty.

History

0.0.3: Fix PAC problem.

0.0.2: Add PAC file to use with plugins to redirect non-HTTP traffic so you won't feel any lag.

0.0.1: The very start