Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
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Description

I am using the typescript-angular generator. In the api.service it generates a basePath using http://localhost when you use a relative path.

protected basePath = 'http://localhost';

openapi-generator version

5.3.1

OpenAPI declaration file content or url

servers:
  - url: '/api'

Steps to reproduce

Set the url in the openapi specification to a relative path, for example /api. When you run the typescript-angular generator now, it will generate the basePath in the api.service as http://localhost/api instead of /api

Related issues/PRs

#2731
#8576

Suggest a fix

Remove the prefixed http://localhost when a relative path is used.