Why is my gateway/reverse proxy forcing Content-Type: text/plain in header?

[Jonathan Gutow <gutow@xxxxxxxxx>]

I have the following very simple gateway set up.  For some reason I  
am getting the field
Content-Type: text/plain
added to the HTTP header.  Thus pages served through the apache  
gateway display the source code rather than displaying as html.

I'm also confused by why the "Header always unset Content-Type"  
doesn't cure my problem.  I thought it should strip out all  
occurrences of "Content-Type". As you can see from the commented out  
lines below, I also tried a simple rewrite rule.  I assume I'm making  
a silly mistake.  Can anybody  help me spot it?

Thanks,
Jonathan
-------proxy part of config file------
#gateway to sage
ProxyRequests Off
ProxyVia Off
ProxyPreserveHost On

<Proxy *>
    Order deny,allow
    Allow from all
</Proxy>

ProxyPass /sage http://127.0.0.1:8000
ProxyPassReverse /sage http://127.0.0.1:8000
Header always unset Content-Type

#RewriteEngine On
#RewriteRule ^/sage(.*)$ http://127.0.0.1:8000$1 [P,T=text/html]
---------------------------

                         Dr. Jonathan H. Gutow
Chemistry Department                                 gutow@xxxxxxxxx
UW-Oshkosh                                           Office:920-424-1326
800 Algoma Boulevard                                 FAX:920-424-2042
Oshkosh, WI 54901
                 http://www.uwosh.edu/faculty_staff/gutow/





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