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ANNOUNCEMENT: Libwww 5.1a Available

From: Henrik Frystyk Nielsen <frystyk@w3.org>
Date: Sat, 22 Mar 1997 18:21:01 -0500
Message-Id: <>
To: www-lib@w3.org

The latest version is available from


This is expected to be the last release of Libwww, since we are now moving
to the Jigsaw code base, written in Java. Java provides a more powerful
platform for experimentation than C, which will accelerate our new protocol
experiments this year.

This is the version that was used for the HTTP performance paper "Network
Performance Effects of HTTP/1.1, CSS1, and PNG" which you can find at


It supports HTTP/1.1 pipelining, smart output buffering and zlib based
decompression and has a complete HTTP/1.1 persistent client cache.

As we show in the paper, this makes HTTP/1.1 outperform HTTP/1.0 in all the
cases that we have tested.

In addition to this we have also done some testing on how HTML
case-canonicalization affects compression. You can find the study at


It shows that lower case HTML tags is better than uppercase and that mixed
casing gives the worst result. You can also find a simple "deflater" tool

Also, we have done some testing on how compression tends to have a good
effect on TCP slow start and delayed acknowledgement. You can find this
note at


As you might have guessed from the URLs above - we keep a performance
overview at


Thanks to Markku Savela for the new SGML parser!


Henrik Frystyk Nielsen, <frystyk@w3.org>
World Wide Web Consortium, MIT/LCS NE43-348
545 Technology Square, Cambridge MA 02139, USA
Received on Saturday, 22 March 1997 18:20:54 UTC

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