URL encoded colon resolves in 400 Bad Request

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It seems that ASP.net does not allow colons before the ‘?’ in an URL, even if it is encoded as %3A.

For example, these won’t work

http://foo.org/api/persons/foo:bar
http://foo.org/api/persons/foo%3abar

But this works:
http://foo.org/api/persons?id=foo%3abar

In all examples, we would expect ASP.NET MVC to pass “foo:bar” as an id argument, properly decoded. I just tested this with MVC4 and it seems to work. It is annoying that it doesn’t accept the URL encoding before the question mark though, but I’m sure there is a good reason for it. Probably to keep everything before the question mark a valid URL and any arguments after the question mark.

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