I've seen the other thread regarding this subject and I must admit this is too technical for me to express an opinion about the situation. I just wanted to mention that today I tested both 'squid-3.1.0.18' and 'squid-3.1.0.18-20100320' in a reverse proxy setup and the client receives '417 Expectation failed' where all the previous 3.1.x worked just fine. In fact I just installed back the .17 version to fix this issue. Regards, Arthur