Keep Alive

HTTP Persistent Connections and HttpClient Connection Pool

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HTTP Persistent Connections and HttpClient Connection Pool

Background The HTTP protocol is a stateless protocol, meaning each request is independent of others. Therefore, its initial implementation was to open a TCP socket connection for each HTTP request, which would be closed after the interaction was complete. HTTP is a full-duplex protocol, so establishing and closing connections requires three-way handshakes and four-way handshakes. … Read more

Learning MQTT Protocol: 007 – Keep Alive Mechanism and Corresponding Messages (PINGREQ, PINGRESP)

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Learning MQTT Protocol: 007 - Keep Alive Mechanism and Corresponding Messages (PINGREQ, PINGRESP)

Background Keep alive is part of the variable header in the CONNECT message. We have mentioned that the Broker needs to know whether the Client has disconnected abnormally to send the last will message. In fact, the Client also needs to quickly detect if it has lost the connection to the Broker in order to … Read more