cURL returns Empty reply from server

I am using following command but in return I am getting "curl: (52) Empty reply from server". Please see the code and advise what change it requires.

curl -k --user "USERNAME:PASSWORD" --request POST --header "Content-type: text/xml" --header "SOAPAction:http://EXAMPLE.COM/b2b/2014/02/IB2BService/SubmitMessage" --data @actual.xml https://EXAMPLE.COM/B2BGatewayService/B2BGatewayService.svc

Any suggestion is highly appreciable.