After spending time diagnosing the message the clue was, the WCF was getting a request with no content type.

My contract was specifically expecting the request format to be XML using the following attribute

RequestFormat = WebMessageFormat.Xml

Hence added the content type as “application/xml” and things went fine.

The following is an example of Fiddler’s request for a REST POST with composite data type

Type: POST
URL: http://localhost:1510/GalleryService.svc/RestService/GetDataUsingDataContract/
Protocol: HTTP/1.1

Request Header:

User-Agent: Fiddler
Host: localhost:1510
Content-Length: 198
Content-Type: application/xml

Request Body:

<CompositeType xmlns="http://schemas.datacontract.org/2004/07/Net.BinaryBits.Apps.BBGallery.WebService"><BoolValue>true</BoolValue><StringValue>String content</StringValue></CompositeType>

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