title: make Squid invisible to 3rd party filters
body: <p>I have my Squid proxy server up and running on CentOS 5.5 with a minimal config and without authentication to bypass internet filtering, it works fine but surprisingly <a href="http://www.whatismyip.com/" rel="nofollow"><code>whatismyip.com</code></a> detects my proxy which is completely a bad idea! it also detects my Squid's version and reveals my real IP address!! :</p>
  
  <pre>
  Your IP Address Is: 91.99.X.X
  Other IPs Detected: 209.54.X.X
  Possible Proxy Detected: 1.1 server.3p3r.com:3128 (squid/2.6.STABLE21)
  </pre>
  
  <p>Where did I go wrong? is there anything I can do to make Squid invisible to these 3rd party filters and proxy detection scripts?</p>
  
  <p>Any resources would be really appreciated, thanks in advance.</p>