HTTP is statel-less,so what does it mean by keep-alive?

Question

Keep-Alive: 300
Proxy-Connection: keep-alive

As we know HTTP connection is closed when the request gets responded,so what does it mean by keep-al

Answer 1

The protocol is indeed stateless, but keep-alive indicates that the connection should be kept open between the client and server.

Opening a TCP connection is a relatively heavyweight operation, and keeping that connection open avoids the setup and teardown cost associated with opening a new connection.