Is the protocol name in URLs case sensitive?

Question

Is hTTp://foo.com the same as Http://foo.COM?

I know that hostnames are not sensitive but path names and query parts are sensitive.

Answer 1

The scheme is case-insensitive: http://tools.ietf.org/html/rfc3986#section-3.1

The hostname is also case-insensitive, since it's DNS.

The rest is case sensitive.