Hi,
I ask the same question Nov 5, 2014.
Bruce reply with the same link about consume restful Web-service with classic and .Net Powerbuilder mix.
I take another way, i first try MSXML but some Web Services return error that i can't resolve.
I finally created a com dll in C # that gives access to an object to use this kind of Web-services. It's not really complete but that do the job.
This allowed me to reuse code written with old projects written in PB9.