TMG 2010: 12156 The HTTP message includes an unsupported header or an unsupported combination of headers.

This issue is occurring with TMG 2010.  

http://support.microsoft.com/kb/935693

HTTP header that begins with a space or with a TAB character

Is there a way to edit this configuration (DROP_CONTINUATION_LINES) in TMG 2010 or is there another fix for this?  I can only find a fix for ISA.