+- The default keep-alive timeout has been reduced to 5 seconds
+ to work around hangs in clients that treat the proxy like any
+ other host and stop allowing any new connections if the
+ "maximum number of connections per host" is reached.
+- Some webbug URLs that look like they are leading to images
+ are blocked as image instead of empty documents. Doing the latter
+ causes WebKit-based clients to show a "missing image" graphic
+ which may mess up the layout.