- make it take nsIURI as base URI, for IDN support and correct charset handling
- use an octet array instead of string for binary data
- use ACString for the mime type
- improve documentation
r=marco sr=darin
git-svn-id: svn://10.0.0.236/trunk@165326 18797224-902f-48f8-a5cc-f745e15eee43