Is it so strange? XML-RPC is simpler ancestor of SOAP. JSON-RPC is a superset of XML-RPC (includes e.g. named parameters), defined over JSON instead of XML. JSO

Is it so strange? XML-RPC is simpler ancestor of SOAP. JSON-RPC is a superset of XML-RPC (includes e.g. named parameters), defined over JSON instead of XML. JSON-RPC doesn't have the wide spread of XML-RPC, though. I don't see much wrong with those, and they do much better than REST, since they already have well-defined way of signaling errors.