For anyone using the Squid proxy server, either on Linux or Windows, these parameters will anonymize enough traffic so that websites you attempt to access will still work (such as ajax-heavy sites like Facebook), but your source IP information will still be concealed.

via off
forwarded_for off

header_access Cache-Control deny all
header_access Forwarded-For deny all
header_access From deny all
header_access Keep-Alive deny all
header_access Link deny all
header_access Pragma deny all
header_access Proxy-Connection deny all
header_access Server deny all
header_access Via deny all
header_access WWW-Authenticate deny all
header_access X-Cache deny all
header_access X-Cache-Lookup deny all
header_access X-Forwarded-For deny all