Haproxy is a tool used for service discovery. Its features are :

• it acts as a proxy and is stateful.
• it does stickyness by maintaining a client at the same backend server.
• it serves as a Loadbalancer and does High Availability with 9 LoadBalancing algorithms
  • Round Robin
  • Least
  • First
  • Source
  • URI
  • HDR
  • …
• it facilitates security and the implementation of SSL
• it allows address and port translation to be performed
• it is multi-protocol and facilitates configuration in terms of timeout
• it allows for forwarding
• it includes a monitoring system.
• it allows for service reload
• it allows spof with the keepAlive tool
• it allows for slow start
• it allows you to do stickyness
• it allows you to do url rewriting
• it is used to do service discovery