Hi,
What would be the best way to perform crawling with two different
user-agents so as to compare the pages (requested with the two different
agents) returned by a server and accept/reject the url (for subseqent
parsing/indexing etc.)?
I believe the Google crawler used to do (still does?) something similar to
prevent spam sites presenting one page to the crawler and a completely
different one to a user accessing the url with a conventional browser.
So, I guess my question is, is this best done with a new http fetcher plugin
and if so how might it best be implemented so as not to double the number of
parsing/indexing operations?
-Ed
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