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When a connection that is consuming a generated response is closed, Flask closes the generator making it raise the special `GeneratorExit` exception when the program tries to yield from it again. Because the `transcode` function was called (returning a generator) before being passed into `set_generated`, the exception was being handled in the wrong order. By passing the `transcode` function to `set_generated` and letting `set_transcode` call it to return a generator while generating the response for the client, the exception properly bubbles up through `transcode` into `set_generated`. This allows both of them to handle it properly by stopping the subproceses and not caching the incomplete response data respectively.