Data Transfer Congestion

We can only send the next HTTP Request when we receive the HTTP Response for the previous HTTP Request sent. This may cause Head-of-Line Blocking (队头堵塞) which leads to data transfer congestion

Keep-Alive (持久连接)

Reduce Overhead

For each HTTP Request, we don’t need to initialised another TCP Handshake and both the http request and HTTP Response are sharing the same TCP Connection. This solves the high overhead issue in HTTP 1.0

HTTP 1.1 Pipelining


Response must be received in the order of sending the Request. This is a problem, because we may lose the 1st Request, then the second Response becomes the result for the 1st HTTP Request