HTTP/HTTPS proxy in a single python script

• easy to customize
• require no external modules
• support both of IPv4 and IPv6
• support HTTP/1.1 Persistent Connection
• support dynamic certificate generation for HTTPS intercept

This script works on Python 2.7. You need to install OpenSSL to intercept HTTPS connections.

Just run as a script:

$ python proxy2.py

Above command runs the proxy on localhost:8080. Verify it works by typing the below command on another terminal of the same host.

$ http_proxy=localhost:8080 curl http://www.example.com/

proxy2 is made for debugging/testing, so it only accepts connections from localhost.

To use another port, specify the port number as the first argument.

$ python proxy2.py 3128

To intercept HTTPS connections, generate private keys and a private CA certificate:

$ ./setup_https_intercept.sh

Through the proxy, you can access http://proxy2.test/ and install the CA certificate in the browsers.

You can easily customize the proxy and modify the requests/responses or save something to the files. The ProxyRequestHandler class has 3 methods to customize:

• request_handler: called before accessing the upstream server
• response_handler: called before responding to the client
• save_handler: called after responding to the client with the exclusive lock, so you can safely write out to the terminal or the file system

By default, only save_handler is implemented which outputs HTTP(S) headers and some useful data to the standard output.