404 == broken link?

From: Balachander Krishnamurthy (bala@research.att.com)
Date: Wed, Jul 07 1999

Message-Id: <199907071637.MAA40080@raptor.research.att.com>
To: www-wca@w3.org
Date: Wed, 07 Jul 1999 12:37:05 -0400
From: Balachander Krishnamurthy <bala@research.att.com>
Subject: 404 == broken link?

[thanks for being patient, am exiting the infocom pit and have some time
 to write my thoughts about wca stuff]

Jim Pitkow writes:

>404 == broken link was the heuristic I used to compute the number from the
>AOL traces.  Not perfect, but was % was confirmed by some VT traces as well./

>What rate do you see in the World Net traces

anja did some very recent counts:
   for HTTP/1.0 we get 1 % 404 reponses
   for HTTP/1.1 we get less than 1.5 

however, 404 is not the same as broken link. it is a heuristic that should
be (at least) tested by sending requests from different user-agents/sites
just to make sure that ambient things are not resulting in 404.