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Is a url like http://example.com/foo?bar valid?
I'm looking for a link to something official that says one way or the other. A simple yes/no answer or anecdotal evidence won't cut it.
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They're perfectly valid. You could consider them to be the equivalent of the big muscled guy standing silently behind the mob messenger. The guy doesn't have a name and doesn't speak, but his mere presence conveys information.
It is valid: see Wikipedia, RFC 1738 (3.3. HTTP), RFC 3986 (3. Syntax Components).