Sometimes things don't go OK. If so, there's never a response and a fault; you can't have it both ways. The fault looks just like a body except it says it's a fault. When the fault is a server fault and the server is a Java implementation, most of the time the fault includes an exception stack trace inside. However how well the errors are represented and handled is very implementation specific.

• An error condition is a fault
• The fault is the only thing in the response body
• Type of faults:
  • VersionMismatch
  • MustUnderstand
  • Client
  • Server