Language Filters

Proxomitron, the Universal Web Filter, is a filtering web proxy written by Scott R. Lemmon. more...

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This program was originally designed to run under Windows 95, and all further development of the program was ceased in 2003; even so, Proxomitron is still viable and used on modern Windows platforms such as XP and Vista. The program is generally used to block pop-ups and banners, to remove embedded sounds and animation from web pages, to alter or block javascripts, and to modify the appearance and content of web pages.

Overview

Properly configured, Proxomitron intercepts HTTP traffic between the user's browser and web servers. The program is capable of altering web page content by removing or adding text. Additionally, it can add, modify, or delete HTTP message headers, be configured to block connections or redirect requests based on the web page address, and be configured to route connections through a remote proxy. The user can monitor connections and filter activations, if desired.

Program operation is dictated through the use of a configuration file containing specialized filters which can be written, edited, deleted, enabled or disabled by the user via the program's graphical user interface. (Third-party filters can also be imported, or "merged," into the configuration.) The filters utilize a "matching" language similar to the standard regular expressions used in text editing. Additional files, such as "blocklists" and SSL DLLs, can extend filtering capabilities.

Use of the program requires knowledge of the Proxomitron scripting language, as well as some familiarity with at least one of HTTP, HTML, JavaScript, and CSS. The scripting interface was not designed to be user-friendly. Because of these complications, the program can be difficult to customise for novice or non-technical users. A default set of filters is included with the program; advanced filters and filter sets written by experienced users are also available online. (See external links.)

Features

The following items are the basic applications and features of the program.

Filter page content;

Using the scripting language, filters are prepared with editing commands to match and replace text in the downloaded page. Specific pages can be targeted for filtering by matching the page's URL with a specified pattern.

Filter HTTP headers;

Separate filters for incoming and outgoing HTTP headers can be used to modify the values of existing headers, add new headers, or delete headers. One example of such usage would be for cookie management.

Variables;

Read more at Wikipedia.org