OpenAPI 3 relative server urls are marked as invalid.

[tdextrous]

When using relative server urls in OpenAPI 3.0 like shown:

"servers": [
  {
    "url": "/api/foo"
  }
]

An error is thrown:

TypeError [ERR_INVALID_URL]: Invalid URL: /api/foo

Stack trace points to the error occurring here. It seems that all values in the url field are assumed to be complete urls. Is there some way we can check for a relative url before passing to the URL constructor?

[spasquali-ww]

Using "api-schema-builder": "^2.0.3"

This also fails as INVALID_URL

servers:
  - url: '{protocol}://api.example.com'
    variables:
      protocol:
        enum:
          - http
          - https
        default: https

May be related to swagger-api/swagger-parser#1329