Integration Server 10.3 | Integration Server Administrator's Guide | Content Handlers in Integration Server | How Integration Server Chooses a Content Handler for an HTTP Request
 
How Integration Server Chooses a Content Handler for an HTTP Request
To determine which content handler to use for an incoming HTTP request, Integration Server looks at the Content-Type header field in the request header, and then uses the content handler registered for it. For example, if the request header specifies Content-Type=text/html, Integration Server looks for a content handler that has been registered as the text/html content handler.