Based on my answer to your previous question, I take you are developing WCF REST service. Have you defined properties of
attribute as below. Change
type to POST
if you are using POST
Method = "GET",
RequestFormat = WebMessageFormat.Json,
ResponseFormat = WebMessageFormat.Json,
UriTemplate = "/SampleUrl")]
You may refer my below Tip/Trick on the topic of "Debug WCF REST Service" using Fiddler. (Not an advertisement :))
Debug WCF REST Service.
Above Tip is based on XML data, just use Content-Type: application/json
in "Request Headers" Tab of Fiddler.