On 8/12/05, Carlos Zottmann <carlos.zottmann@xxxxxxxxx> wrote: > Does anyone know a way to block web bugs (0x0 gifs) with squid? Interesting question. Since the function of a web bug is fulfilled when the URL is retrieved from the remote server, and since Squid can't see the GIF's dimensions until after the object is received, I'd say it's technically impossible to effectively block web bugs using Squid, short of composing a regular expression to match all likely tracking bug URLs (watch out for false positives). You could certainly modify Squid (or any caching proxy) to detect when a received image has dimensions below a certain minimum, and react by forcing any _future_ requests for that object to be served from cache regardless of the headers supplied by the server or a cookie or other header requested by the client. This wouldn't help the first time any user triggers a web bug, but would effectively keep private any future requests for that same exact URL. Kevin Kadow
