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For example if a page has its left nav changed, could this appear in the cache but the rest of the page be from the old page - more specifically a single line at the very bottom of the page not be updated?
If google doesnt do this directly is it possible an isp may have served it some kind of mongrel page?
Is it remotely possible that the google cache would reflect only some changes to a web page?
more specifically a single line at the very bottom of the page not be updated?
That's rather odd.
If google doesn't do this directly, is it possible an isp may have served it some kind of mongrel page?
It would be your website hosting company rather than your Internet Service Provider. Are the people hosting your site a reputable bunch? If they're a respectable company, it's unlikely; if they're Billy-Bob and Bubba's free hosting, based on a barge in the Mississippi, then perhaps it's possible.
Hosting company are reliable and they have checked this out for us but can't find anything.
We figured our webserver was infected with something or other, so we did a complete re-install of the server, scanned any files to be re-used etc. After the re-install we changed the left nav on the page. The google cache picked up the left nav but the extra js was still in there.
We checked our web server again but there is 100% no js in the source html. Our web hosts have scanned everything and are 100% sure the server is clean.
Fortunately the page got re-cached overnight, since first posting this, and the snippet of js is no longer there but I am concerned as I don't really understand what is happening.