Recently, a web site that was doing very well (top 3 positions on page 1) in Google on a number of keywords has dropped from the top positions on most keywords (I can't find the site at all now, it's certainly not in the first 5 pages).
Just before this happened, I made the following changes...
I removed the google noarchive tag.
(This was to make google show the cache on its listings)
I added a last-modified header
(The last modified header radomly returns a date between 1 and 60 minutes before the time the page is viewed) - I did this to see if google would show a fresh tag.
I added some headers to stop browsers caching the page. These were as follows:
I also set the Expires header to return a date in the past.
I made those changes on the Friday and on the Monday, the pages wern't ranking highly any more. Google had indexed the home page and the home page cache was showing when I did a search foir my site (using site: in Google)
Because of the drastic drop in ranking, I undid a lot of the changes. The only things still remaining are:
The google noarchive tag
The Cache-control: no-cache header
However, despite the google cache showing the version of the page after these changes, the rankings are still taking a hit.
My toolbar PR is still 3 as it has been for a long time
Does anyone know why my pages might have dropped and how can I get them back to where they were in the rankings?