From: Richard Alimi <ralimi@us.ibm.com>

The following is a patch that disables the addition of the Content-Length
HTTP response header when a chunked response is being sent.

OpenSim/Framework/Servers/BaseHttpServer.cs

@@ -222,6 +222,7 @@ namespace OpenSim.Framework.Servers
 
                     request.InputStream.Close();
                     if (!response.IsContentTypeSet) response.ContentType = requestHandler.ContentType;
+                    if (!response.SendChunked)
                         response.ContentLength64 = buffer.LongLength;
 
                     try