The URL to validate
True if the URL is valid, secure, and has the correct path suffix
isValidWellknownUrl('https://am.example.com/.well-known/openid-configuration')
// Returns: true
isValidWellknownUrl('http://localhost:8080/.well-known/openid-configuration')
// Returns: true (localhost allows HTTP)
isValidWellknownUrl('https://am.example.com/am/oauth2/alpha')
// Returns: false (missing /.well-known/openid-configuration path)
isValidWellknownUrl('not-a-url')
// Returns: false
Validates that a well-known URL is properly formatted.
Checks that the URL:
/.well-known/openid-configuration(per OpenID Connect Discovery 1.0)