When using various web service technologies, you have an option to use a WSDL (Web Service Definition Language) that contains meta-data to describe the web service. With CSV Connector, a web service that uses a WSDL follows a message response pattern for sending data and receiving the URL for the output file. When you do NOT use a WSDL, all information within the web service is appended as parameters.

Example request to a .NET service (ASPX) with a WSDL

Example request to PHP service WITHOUT a WSDL