REST

With DataFlex you can create RESTful web services as well as consume those web services.

Client side

Consuming REST services was made a lot easier since DataFlex 19.0 when it added native JSON support.

Consume a REST service: See cJsonHttpTransfer and JSON Parsing and Transfer

Server side

Creating REST web services has been made easy since DataFlex 19.1 with the introduction of the cWebHttpHandler handler.

You can create a REST service with earlier DataFlex versions, see here for how-to do so in DataFlex 19.0, but it is probably better to use DataFlex 19.1 in that case.

External references

http://salzlechner.com/dev/2016/03/02/interfacing-dataflex-restful-web-services/

forum post: New REST support

Building RESTful webservices excercise notes (by Mike Peat)

OAuth Restful & Web API integration forum