Pipelining and multiplexing, both suffer from head-of-line blocking. But what is head-of-line blocking and how does it impact the performance in HTTP? — Head-of-line blocking or HOL blocking is a generic term in computer science that refers to a performance-limiting phenomenon that occurs when a line of packets is held up by the first packet. It can occur in network devices, transport protocols (for eg, in HTTP pipelining), or distributed systems (for eg…