I am configuring an anonymous proxy. I do not want target websites to know that they are being accessed by a proxy but Squid always adds 'Proxy-Connection: keep-alive' header! I use the following configuration settings: header_access via off header_access x_forwarded_for off header_access X-Cache deny all header_access X-Cache-Lookup deny all header_access Proxy-Connection deny all header_access Keep-Alive deny all Squid version is Version 2.6.STABLE21. Why is 'header_access Proxy-Connection deny all' ignored?