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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: AdZapper
Proxy Name AdZapper
Language and version python version: 1.5.2
HTTP version 1.1
HTTPS Connect no
Windows NTLM support no
Last updated YYYY-MM-DD 2001-09-02
Platform all
Author Adam Feuer
Home page http://www.zaplet.org/adzapper/
Primary features Elimination of Banner Advertisements. Programmable through XML "zapplets": a wizard is provided. Controllable through a web/browser interface.

From the product page:

adzapper is a filtering proxy that can block ads from being displayed on your web browser. instead of ad banners, you see blank spaces: adzapper transforms the ads into transparent gifs.

The rules that describe what are ads and what are not ads are called "zaplets", and are configurable on a per-website basis. This way, when websites change their ads or their graphic design, it is easy to build and share new zaplets that block the ads.

adzapper is based on Sam Rushing's Medusa, a very fast asynchronous-sockets web-server written in Python. Medusa is single threaded, but this doesn't mean it is slow! in my experience it is one of the fastest, lightest webservers out there.

License Python
Design Architecture Medusa
Notes From the product's About Page: "adzapper was inspired by the Muffin filtering proxy written by Mark Boyns, and additional inspiration and the impetus to start coding was provided by Constantinos Kotsokalis and his CTC filtering proxy".