If there is a yaml like this:

servers:
- url: /abc

Then Validator must fail. Because schemes are parsed as []string{"/abc"}.

According to the example in the Server URL Format subsection of OpenAPI document, / /v1/reports are also legal URLs.

Although the scheme://host[:port][/path] above is inconsistent, many places that don't require scheme and host validation already use something like /path.

This place may need to be optimized https://github.com/getkin/kin-openapi/blob/v0.74.0/routers/gorillamux/router.go#L38

Additional:

If I don't want to verify the host now, I can change

servers:
- url: /abc

to

servers:
- url: http:///abc

But if I want to not check scheme, there seems to be no way now?