Login through Gitlab returns 500

[vimal7016]

Describe the bug

Login through Gitlab returns 500

Reproducing the bug

Steps to reproduce the behavior:

1. Follow exactly same steps

Server logs

[
  {
    "code": 500,
    "status": "Internal Server Error",
    "reason": "Unable to initialize OpenID Connect Provider: Get \"/.well-known/openid-configuration\": unsupported protocol scheme \"\"",
    "message": "An internal server error occurred, please contact the system administrator"
  }
]

Server configuration

selfservice:
  default_browser_return_url: http://127.0.0.1:4455/
  whitelisted_return_urls:
    - http://127.0.0.1:4455

  methods:
    password:
      enabled: true
    
    oidc:
      enabled: true
      config:
        providers:
          - id: gitlab # this is `<provider-id>` in the Authorization callback URL. DO NOT CHANGE IT ONCE SET!
            provider: gitlab
            client_id: ... # Replace this with the OAuth2 Client ID provided by GitLab
            client_secret: ... # Replace this with the OAuth2 Client Secret provided by GitLab
            mapper_url: file:///etc/config/kratos/oidc.gitlab.jsonnet
            scope:
              - read_user
              - openid
              - profile
              - email

Environment

• Version: v3.7 (quickstart.yml)
• Environment: Docker

[zepatrik]

As a hint for anyone working on this: I suspect the order of operations here:

kratos/selfservice/strategy/oidc/provider_gitlab.go

Lines 37 to 44 in f87c939

	o, err := g.OAuth2(ctx)
	if err != nil {
	return nil, errors.WithStack(herodot.ErrInternalServerError.WithReasonf("%s", err))
	}
	client := o.Client(ctx, exchange)
	u, err := g.endpoint()