[MAPSERVER-USERS] Change Content-Type header for GML GetFeatureInfo request on Apache

[mpriour]

I want to rewrite the Content-Type header of the response for a GML format
GetFeatureInfo request.
I need to add "; charset=utf-8" to the default  "application/vnd.ogc.gml"
content-type header.
As reported in Ticket #2583 (http://trac.osgeo.org/mapserver/ticket/2583),
the encoding directive in the xml declaration tag is not enough to get some
browsers to properly parse the xml properly when it contains non- US-ASCII
characters. Since this defect is not scheduled to be fixed until 5.4, I need
some other way to add to or modify the Content-Type so that it can be
properly parsed by browsers.
I am using the CGI version of mapserver on an apache-2.0.61 on 64bit Linux
Slackware from HostGIS

Mapserver directly sets a Content-Type header which is not text/plain or any
other text/* type. Therefore the default content-type, default charset,
mime.type and magic do not have any effect on the Content-Type header
generated by mapserver.
 
Also since the output is from a cgi program with no extension, and mapserver
produces responses with other content-types that I don't want modified, Add
Type & Force don't seem to be valid options. 

I want to ensure that all responses with a Content-Type header of
"application/vnd.ogc.gml" are modified to "application/vnd.ogc.gml;
charset=utf-8" or even "text/xml; charset=utf-8". 
What is the best way to go about this? 
 
Do I need to write a custom ContentFilter or is there some way to set
options in httpd.conf, .htaccess, or other such file that would make this
content-type modification automattically?
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