[patrick-immometrica]

Scheme::from_str("HTTP") returns an Other scheme instead of the standard one. The case-insensitive compare from #485 only applies between two Other schemes, so the parsed value is never equal to Scheme::HTTP. It also hashes differently, and as_str() returns "HTTP". Parsing a full Uri already lowercases the scheme, so only the standalone parse is affected:

let s: Scheme = "HTTP".parse().unwrap();
assert_eq!(s.as_str(), "http"); // fails, "HTTP"

parse_exact now matches http/https with eq_ignore_ascii_case. RFC 3986 3.1 says schemes are case-insensitive, and this is the scheme part of #46.

The new test fails on master with

assertion `left == right` failed
  left: "HTTP"
 right: "http"

and passes with the change.