These are the headers I get for the Dropbox file link:

ContentTypeHeader QVariant(QString, "application/xml")
ContentLengthHeader QVariant(, )
LocationHeader QVariant(, )
LastModifiedHeader QVariant(, )
CookieHeader QVariant(, )
SetCookieHeader QVariant(, )
"Server" "dbws"
"Date" "Thu, 04 Nov 2010 09:43:19 GMT"
"Content-Type" "application/xml"
"Connection" "keep-alive"
"x-robots-tag" "noindex,nofollow"
"etag" "87861968n"
"pragma" "public"
"cache-control" "max-age=0"
"Content-Encoding" "gzip"

No redirection...

As a comparison, here are the headers for http://qt.nokia.com/logo.png

ContentTypeHeader QVariant(QString, "image/png")
ContentLengthHeader QVariant(qlonglong, 1478)
LocationHeader QVariant(, )
LastModifiedHeader QVariant(QDateTime, QDateTime("wo 11. aug 09:06:42 2010") )
CookieHeader QVariant(, )
SetCookieHeader QVariant(, )
"Server" "nginx"
"Date" "Thu, 04 Nov 2010 09:46:15 GMT"
"Content-Type" "image/png"
"Connection" "keep-alive"
"Last-Modified" "Wed, 11 Aug 2010 09:06:42 GMT"
"X-Caching-Rule-Id" "downloads"
"X-Cache-Rule" "downloads"
"X-Header-Set-Id" "cache-in-proxy-24-hours"
"Cache-Control" "max-age=43200, s-maxage=43200, public"
"Content-Length" "1478"
"X-Varnish" "1135007819 1133377828"
"Age" "83560"
"Via" "1.1 varnish"

So I guess I'm out of luck!