I guess it's similar to SOAP, it was usually over HTTP but sometimes the alternatives were used (eg. email [1]) [1]: https://www.w3.org/TR/soap12-email/ https:

I guess it's similar to SOAP, it was usually over HTTP but sometimes the alternatives were used (eg. email [1]) [1]: https://www.w3.org/TR/soap12-email/ https://www.w3.org/TR/soap12-email/