What does phx.server do under the hood?

What mix task phx.server really do under the hood?

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Just starts the application in a regular way, but with extra application env variable (serve_endpoints) which states that the listener must be started


The best way to know it is reading the code.

As you said, phx.server is a mix task. And mix tasks have a pattern on the file structure, they are always placed in lib/mix/tasks/.

For phoenix, the file is phoenix/phx.server.ex at b1efc790680d03baf5afb4896d6ec384a3605da4 · phoenixframework/phoenix · GitHub, check it out.