HAProxy Concepts
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Internal
SSL Support
HAProxy can be configured to terminate the SSL connection or to pass it through the backend server.
SSL Termination
SSL Pass-Through
When HAProxy is configured with SSL pass-through, the backend servers handle the SSL connection, rather than the load balancer. The load balancer will just simply proxy the request off to its backend server. The connection will remain encrypted, and the load balancer cannot see what it contains. The frontend will have to be configured in "tcp" mode.