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Identifying the Blocking Behavior A common pitfall in FastAPI occurs when a synchronous, blocking operation is placed directly inside a coroutine endpoint. This causes the event loop thread to freeze, preventing other requests from being processed until the blocking call finishes. Consider the following minimal reproduction, where a simulated d ...

Blocking and Non-Blocking I/O1. Fundamental ConceptsScenarios Causing BlockageReading from device or network files (e.g., terminal /dev/tty) often leads to blocking, unlike reading regular files which completes in a finite duration.Reading from a terminal without a newline character in the input buffer causes the read call to suspend the callin ...