What load balancing methods are you familiar with and have used in your projects?

The main load balancing methods I am familiar with and have used:

1. Round Robin — requests are distributed to servers in a cyclic order.
2. Least Connections — requests are sent to the server with the fewest active connections.
3. IP Hash — requests from the same client are always directed to the same server, useful for session persistence.
4. Weighted Load Balancing — servers are assigned weights, and load is distributed proportionally.

In projects, I most often used Round Robin and Least Connections because they are simple and effective for most tasks. For example, in configuring Nginx or HAProxy for HTTP request distribution.