5.1.2 just specifies that it's a RequestURI and does not further define it. I'm not sure if I understand. The one I'm looking at further defines it as: Re

5.1.2 just specifies that it's a RequestURI and does not further define it. I'm not sure if I understand. The one I'm looking at further defines it as: Request-URI = "*" | absoluteURI | abs_path | authority Edit: ah, of which, absoluteURI refers to 3.2.1, which references RFC2396, which includes mailto. Still, doesn't include user:password@domain, though :-P Src: http://www.ietf.org/rfc/rfc2616.txt http://www.ietf.org/rfc/rfc2616.txt