Use request.URL.Host instead when request.Host is empty

[StoneMoe]

As we discussed in Slack, this will add support for HTTP requests with empty request.Host, such as elasticsearch client, which set request URL after a path-only request creation.

Ref: https://the-asf.slack.com/archives/CHQ1L4T54/p1734924623039789

[mrproliu]

Please update the CHANGES.md file.

[mrproliu]

Reference to the slack link: https://the-asf.slack.com/archives/CHQ1L4T54/p1734924623039789

[wu-sheng]

Binary is not allowed. Please remove this unexpected file.

[mrproliu]

@StoneMoe, please fix the CI failure.

[StoneMoe]

@StoneMoe, please fix the CI failure.

It says:

Error: instrument.go:38:9: string `http` has 2 occurrences, make it a constant (goconst)
	return "http"
	       ^

Maybe we should fix it by incresing goconst min-occurrences options? @mrproliu

[mrproliu]

Can you help to check why there say 2 occurrences, If so, we should add a new const here.

[StoneMoe]

Can you help to check why there say 2 occurrences, If so, we should add a new const here.

In test file there is a new "http" string I added.

Considering change goconst option ignore-tests to true instead I think.