HTTP persistent connection
HTTP persistent connection is a connection method introduced in HTTP/1.1 which enables using one connection to send/receive multiple HTTP requests/responses.
Advantages
- less cpu & memory usage (because fewer connections are open simmultaneously)
- enables HTTP pipelining of requests and responses
- reduced network congestion (fewer packets opening TCP connection)
- reduced latency in subsequent requests
- errors can be reported without the penalty of closing the TCP connection