Re: multiple Content-Encoding:'s

May I suggest that you really want to establish a small set of
"Transfer-Encoding" attribute values, and not a large set of
"Content-Encoding" attribute values, so you should simply rename the
"Content-Encoding" attribute to be 
"Transfer-Encoding"!

Thus you will be naming it to be what it means, 
instead of misleading us all with a false name.

Just say what you mean, and mean what you say.

Voila'...\Stef