Hi all,
The problem:Google pointed out to me that I have a large increase of 404 errors. In short I had software before that created pages (automated) for long tale search terms and feeded them to google. Recently I quit this service and all those pages (about 500000) were deleted. Now google GWM points out about 800000 404 errors.
What I noticed: I had a large amount of 404's before when I changed my website. I fixed it (proper 302) and as soon as all the 404's in GWM were gone I had around 200 visitors a day more.
It seems that a clean site is better positioned.
Anybody any suggestion on how to tell google that all urls starting with www.domain/webdir/ should be deleted from cache?