Accessing external web service with non-constant URL

Hello, all

I am looking in the documentation on accessing external web services, but either I am looking in the wrong place, or the documentatoin is lacking info.

My clients have several web services in the local network (regular services, not DB-based), the have the same interface, but different URL's.

Versions of the DB are 11, 12, and 16.

First of all, I do not see in the specs an option for a non-hardcoded URL. The logic says that this has to be possible, but I cannot find it.

Second, I need to see an example of accessing an XML or JSon based service, I cannot find it in the specs either.

Can anyone point me to a document with examples?

Thank you

Arcady