HTTH-818 — HTTP request line must contain a HTTP method
This message indicates that an HTTP request line was received from a client, but the line has an incorrect format. It is missing required method specification. The request is terminated immediately. The proxy expects the client to use the HTTP protocol unless specified otherwise in the SESSION-ACL.
If you see this message in a transparent HTTPS traffic, you may be missing one of the items SIMULATE-CONNECT, SNI-INSP or CLIENT-SSL in the SESSION-ACL.