HttpMaster is a development tool and a test tool for REST web service. This is a universal HTTP tool and it is used to develop web services like testing HTML forms. There are two editions available in the HttpMaster. Professional edition and express edition. The Professional edition is 100 percent compatible with the express edition. HttpMaster is a very easy installation and it supports Microsoft windows also. But, it is not possible to have the professional edition and express edition at the same time. Either any one of the editions of the HttpMaster should be installed.