title: An HTTP Content-Type header is required for SOAP messaging and none was found
body: <p>maybe you could help me. i am trying to use wcf to transfer a string between client and server. most of the time it is working. but at some clients (one on particular) i received the following error "An HTTP Content-Type header is required for SOAP messaging and none was found". 
  1. is this an error that returns from the server side ?
  2. how can this be fixed ?</p>
  
  <p>Thanks in advance
  G. </p>