83 messages in org.w3.www-tagRE: whenToUseGet-7 counter-proposal
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Subject:RE: whenToUseGet-7 counter-proposalActions...
From:Joshua Allen (josh@microsoft.com)
Date:Apr 23, 2002 11:20:33 pm
List:org.w3.www-tag

Interesting. My experience is completely different, and I wouldn't refer to that as an arcane bug at all.

Oh, it was arcane allright. It involved a combination of pages with cache-control-private set and JPEGs in those pages having no cache hints, and the images' (lack of) cache hints being erroneously applied to the pages.

And any crawlers I have used are deliberately designed to ignore URIs with querystrings.

See Paul's reference re: Google. I'd seen the same behaviour, but didn't have an example so handy. (Thanks, Paul!)

I wasn't claiming that crawlers *can't* crawl querystrings, but any crawlers I have used require you to deliberately turn this on or specify in a filter which querystrings are "safe". I run a crawler internally at Microsoft which crawls pages with querystrings, in fact. But I deliberately configured it to do so, and only with pages that I know to be "safe". I could show you search results that index URLs with querystrings, but that certainly doesn't mean that I consider *all* URLs with querystrings to be "safe" to GET.

There is no way to guarantee that all URLs will be free of GET side-effects, and it would be misleading to tell people that such a guarantee exists.

(I also would be shocked to hear that Google's implementation is blindly crawling querystrings with no heuristics to determine safeness. Without input from the Google guys, I guess we just have to speculate.)