When producing URI/URL strings follow spec and produce lowercase schemes and drop default ports

[joakime]

Jetty version(s)
12.0.6

Jetty Environment
All

Java version/vendor (use: java -version)
Any

OS type/version
Any

Description
The URI spec says that we should accept form of case when we read a scheme, but should produce lowercase schemes.

• https://datatracker.ietf.org/doc/html/rfc3986#section-3.1

The spec also says that the port is optional, and the scheme specific specs for HTTP and websocket says similar things.

URI Specs

• https://datatracker.ietf.org/doc/html/rfc3986#section-3.2
• https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.3

HTTP/HTTPS scheme specific specs

• https://www.rfc-editor.org/rfc/rfc8615.html#section-3
• https://www.rfc-editor.org/rfc/rfc9110.html#name-http-uri-scheme
• https://www.rfc-editor.org/rfc/rfc9110.html#name-https-uri-scheme
• https://www.rfc-editor.org/rfc/rfc9110.html#name-https-normalization-and-com

Websocket scheme specific specs

• https://www.rfc-editor.org/rfc/rfc8307.html
• https://www.rfc-editor.org/rfc/rfc6455.html#section-1.1
• https://www.rfc-editor.org/rfc/rfc6455.html#section-1.7

We should strive to produce proper URIs where we can.