4.4.2. Considering URI Schemes

Applications that use HTTP MUST allow use of the "https" URI scheme and SHOULD NOT allow use of the "http" URI scheme, unless use of the latter is required by operational considerations (e.g., the application is being deployed on a network where TLS is not available).

See [RFC7595] for guidance on minting new URI schemes. Generally, new URI schemes are not necessary for applications using HTTP.