Why didn't you use HAProxy instead of Nginx for load balancing?

The choice between HAProxy and Nginx for load balancing depends on the specific requirements of the project. HAProxy specializes in TCP/HTTP load balancing and is known for its high performance and advanced load balancing features, such as support for complex distribution algorithms and server health monitoring.

Nginx, in addition to load balancing, is often used as a web server and reverse proxy, allowing multiple functions to be combined into a single component. If the project values ease of configuration, web server integration, and caching, Nginx may be preferable.

For example, if flexible HTTP request routing with static content handling and SSL termination is required, Nginx would be more convenient. If only high-performance TCP load balancing with minimal latency is needed, HAProxy might be better.

Thus, the choice of Nginx over HAProxy could be driven by the need to combine load balancing with a web server, ease of configuration, or existing infrastructure.