Content type of PAOS response is "text/xml" but should be "application/vnd.paos+xml"

Content type of PAOS response is "text/xml" but should be "application/vnd.paos+xml". 
The HTTPPAOS11Encoder sets the type to "text/xml".
This changed overrides the content type in WebSSOProfileECPImpl after the HTTPPAOS11Encoder has done its work. An alternative may be to change the content type directly in HTTPPAOS11Encoder.