AWS Classic Load Balancer HTTP终止

Question

AWS a say:

When you use HTTP (layer 7) for both front-end and back-end connections, your load balancer parses the headers in the request and terminates the connection before sending the request to the back-end instances.

What is that supposed to mean? I know I should use Keep-Alive, etc. but this piece of writing is really confusing. If the connection is terminated(and by the way it's TCP, not HTTP level) then a server will have no way to respond to the request.

Answer 1

" terminating the connection" in this context means that the load balancer is the connection endpoint, ie that there is one TCP connection between the client and the load balancer and another one between the load balancer and the server. Terminating the connection does not mean closing it at the TCP level. Instead the connection between client and load balancer is kept open and the payload is forwarded between this connection and the connection(s) between load balancer and server(s).