How to convert an old SOAP Service to a (more) modern REST-Service So you inherited a legacy app that still runs on asmx or WCF services on DotNet Framework? This is what just hapenned to me. For many the first intention is to just rewrite the whole application. Especially when there are a lot of problems in the codebase. But please, do not give in to that urge. Often there are so many hidden features in the codebase and nobody remembers the features that are needed and implemented.