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This site presents a list of open source HTTP proxies written in java and python, with comparison tables, so that you compare the proxies on a feature by feature basis. Further detail is available on each proxy: click it's name for more info.

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What is a HTTP proxy?

A HTTP proxy acts as an intermediary between a HTTP client (i.e. browser) and HTTP server. It receives all requests from the browser, and relays them (possibly modified) to the server. Likewise, it receives all responses from the server, and relays them (possibly modified) to the client. HTTP Proxies can be used for a wide variety of tasks, including filtering, logging, caching, etc, etc, etc.

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Detailed information about PYTHON proxy: NTLM Authorization Proxy Server
Proxy Name NTLM Authorization Proxy Server
Language and version python version: 1.5.2
HTTP version 1.1
HTTPS Connect yes
Windows NTLM support yes
Last updated YYYY-MM-DD 2008-10-21
Platform Windows
Author Darryl Dixon, who succeeded Dmitry Rozmanov
Home page http://ntlmaps.sourceforge.net/
Primary features Windows NTLM authentication, HTTPS
Features

From the product page

'NTLM Authorization Proxy Server' (APS) is a proxy software that allows you to authenticate via an MS Proxy Server using the proprietary NTLM protocol. Since version 0.9.5 APS has an ability to behave as a standalone proxy server and authenticate http clients at web servers using NTLM method. It can change arbitrary values in your client's request header so that those requests will look like they were created by MS IE. Main features:

  1. supports NTLM authentication via parent proxy server (Error 407 Proxy Authentication Required);
  2. supports NTLM authentication at web servers (Error 401 Access Denied/Unauthorized);
  3. supports translation of NTLM scheme to standard "Basic" authentication scheme;
  4. supports the HTTPS 'CONNECT' method for transparent tunnelling through parent proxy server;
  5. has ability to change arbitrary values in client's request headers;
  6. supports unlimited number of client connections;
  7. supports connections from external hosts;
  8. supports HTTP 1.1 persistent connections;
  9. stores user's credentials in config file or requests password from a console during the start time;
License GPL
Design Architecture Threaded
Notes Of note is that Dmitry has built his own HTTP server/client from the ground up, rather than using the HTTP support in the python standard library.