Get the Whitepaper called Web Application Firewall Bypass via Bluecoat Device.
You can download it from the following link: https://packetstormsecurity.com/files/download/156380/WAF_bypass_via_Blueacoat.pdf
Source: https://packetstormsecurity.com/files/156380/Web-Application-Firewall-Bypass-Via-Bluecoat-Device.html