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The heartbeat of SRS is a timer that requests an HTTP URL. We can use this heartbeat to report the necessary information for registering the backend server with the proxy server. ```text SRS(backend) --heartbeat---> Proxy server ``` A proxy server is a specialized load balancer for media servers. It operates at the application level rather than the TCP level. For more information about the proxy server, see issue #4158. Note that we will merge this PR into SRS 5.0+, allowing the use of SRS 5.0+ as the backend server, not limited to SRS 7.0. However, the proxy server is introduced in SRS 7.0. It's also possible to implement a registration service, allowing you to use other media servers as backend servers. For example, if you gather information about an nginx-rtmp server and register it with the proxy server, the proxy will forward RTMP streams to nginx-rtmp. The backend server is not limited to SRS. --------- Co-authored-by: Jacob Su <suzp1984@gmail.com>