Notably, HAProxy uses the PROXY protocol to pass the client’s connection information to backend or origin servers so that an application gets all the relevant information. It is powered by an event-driven, non-blocking engine that combines a very fast I/O layer with a priority-based, multi-threaded scheduler which enables it to easily deal with tens of thousands of concurrent connections. It is also a protection against DDoS and service abuse. HAProxy is an HTTP reverse-proxy, a TCP proxy and normalizer, an SSL/TLS terminator/initiator/offloader, a caching proxy, an HTTP compression offloader, a traffic regulator, a content-based switch, a FastCGI gateway, and more. HAProxy ( HAProxy, which stands for High Availability Proxy), a free, open-source, very fast, reliable, and top-notch load balancer and proxying software for TCP and HTTP-based applications, built for high availability.
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