ijb-zlib - a compressing HTTP proxy

[Download Win32 .EXE] [Obtaining the source] [Compiling the source] [Configuration] [Licence] [Warranty] [Version History] [Author] [Health Disclaimer]

ijb-zlib is a modified version of the Internet Junkbuster Proxy v2.0.2 which can automatically compress text/html and text/plain documents for clients which support Accept-Encoding: gzip (e.g. Netscape 4.7, Internet Explorer 5, Lynx 2.8.3) to save downstream modem/network bandwidth. It uses the zlib compression library to perform on-the-fly compression of HTML documents.

The Internet Junkbuster source underwent substantial changes for portability: ANSI function prototypes were added, and there is better support for a variety of Win32 compilers, including the LCC compiler.

NOTE

Running ijb-zlib on your PC won't speed up your internet access
ijb-zlib must be running on a remote computer for browsers to obtain any benefit from the compression.
ibj-zlib WILL NOT COMPRESS IMAGES
ijb-zlib will only compress text/html and text/plain documents.
A more recent product like RabbIT proxy (requires Java) will compress images

Download Win32 .EXE

A console-based Win32 .EXE was compiled using the LCC compiler.

Download ijb-zlib-11.exe (114 Kbyte)

Obtaining the source

The source for the zlib compression library should be obtained from http://www.zlib.net/, or download the f2.org copy of zlib version 1.1.3 (165 Kbyte). If you use the LCC compiler under windows, download zlib-Makefile.lcc - a makefile for zlib version 1.1.3 using the LCC compiler.
The source for ijb-zlib is available as ijb-zlib-11.tgz (143 Kbyte). The source is a gzip-ed tar file. To unzip under Unix/Linux systems, type:
tar xzvf ijb-zlib-10.tgz
or
gunzip < ijb-zlib-10.tgz | tar xvf -
if you don't have a nice, clever GNU version of tar. Under windows NT, obtain an archiving program like WinZip and extract the source by right-clicking on the archive and selecting the 'extract' option.

Compiling the source

zlib: The zlib compression library should compile without modification. For non-Unix operating systems, a 'Makefile' should be copied from the appropriate subdirectory (amiga, msdos, nt, os2) and renamed 'Makefile'.
ijb-zlib: After modifying the Makefile for your operating system & compiler (be sure to add include and library paths for zlib source you compiled), the source should compile without modification under the same operating systems as Internet Junkbuster Proxy v2.0.2

Configuration

Refer to the supplied Internet Junkbuster Proxy manual (ijbman.html) and FAQ (ijbfaq.html) set up the proxy. The only additional configuration settings for ijb-zlib are:

auto-compress
- If the auto-compress setting appears in the configuration file, proxied text/html and text/plain documents are automatically compressed if the requesting client has specified Accept-Encoding: gzip.
- If the auto-compress setting is not present in the configuration file, no compression takes place.

If you're not interested in the Internet Junkbuster cookie-filtering capabilities and just want compression, you could try using the following configuration files:

junkbstr.ini
## Enable compression
auto-compress
## Enable all cookies to be passed - cookie file contains the single line: "*"
cookiefile scookie.ini
## Accept requests on port 8000 from any machine, not just localhost
listen-address :8000
## Don't make any changes in request headers.
referer .
from .
user-agent .
scookie.ini
## Accept all cookies
*

Licence:

The Internet Junkbuster Proxy (and ijb-zlib) are covered under the GNU General Public Licence, which basically means everyone can "use, copy and modify the Internet Junkbuster as they wish. Companies can use it for commercial purposes, but they are not permitted to use it in products that they claim as their property without negotiating a separate agreement with [Junkbusters] beforehand."
The zlib compression library is used freely in accordance with the zlib licence.

Warranty:

ijb-zlib is supplied "as-is". No warranty is given, as per the GNU General Public Licence. Use ibj-zlib at your own risk.

Version History:

v1.0 - 4 August 2000 - Initial release, based on Internet Junkbuster Proxy v2.0.2 -- archive of v1.0 source
v1.1 - 13 June 2002 - Made modifications:
- HTTP headers now separated by standards-compliant \r\n instead of \n [Thanks to Craig Carey for pointing this out]
- Bug where compression line had to match 'Accept-Encoding: gzip...' fixed ; will now recognize gzip anywhere in 'Accept-Encoding' field. [Thanks to Jan Willamowius for pointing this out]

Author:

Fred Curtis added the ANSI prototypes and compressing code - everything else is the hard work of the Internet Junkbuster Proxy authors.

Health Disclaimer:

The recommended pronuciation of "ijb-zlib" is "eye jay bee zed lib" (or "zee lib"). Attempting to pronounce "ijb-zlib" directly as written may lead to injury of the tongue or larynx -- although the teenager in the author's household makes a very good approximation of the sound when something surprising happens in "Pacman World" on his Playstation. The phrase "ijb-zlib" may or may not be an expletive in Arabic.

	This page last changed: 5 Mar 2008
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