Is it possible to run the ffmpeg command as a server?

Instead of running the “ffmpeg” command on every request in my REST API, I want to be able to run it a single time as a server, a separate process or service, and have the REST endpoint call the server over any supported protocol. The endpoint should be able to stream the input and receive the streamed output from the server. Is this possible using the ffmpeg CLI? I can’t find a single resource that covers this use case. If possible to provide the right command configuration. Thank you.