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WCF Basic Http Binding - Two server requests per method call

Posted By:      Posted Date: September 03, 2010    Points: 0   Category :WCF
 
We have a service that uses BasicHttpBinding/Transport Security/Windows Authentication and is hosted in IIS. I have created a unit-test application in VSTS and whenever we test a WCF method, Fiddler records two calls. 1st call - No authorization token is sent. The WCF service returns a 401 error - Unauthorized: Access is denied. Http headers as sent in the request given below. POST http://localhost/AccountScreen.svc HTTP/1.1 Content-Type: text/xml; charset=utf-8 SOAPAction: "IAccountScreen/RetrieveAccountDetails" Host: localhost Content-Length: 243 Expect: 100-continue Connection: Keep-Alive 2nd call - Authorization token is sent and the WCF service returns the expected response. POST http://localhost/AccountScreen.svc HTTP/1.1 Content-Type: text/xml; charset=utf-8 SOAPAction: "IAccountScreen/RetrieveAccountDetails" Authorization: Negotiate Host: localhost Content-Length: 243 Expect: 100-continue I am not able to figure out why there are two calls made to the server in the first place and what is the significance of the first call. Any thoughts?


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