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Document cancel safety #4054

@jorendorff

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@jorendorff

Would you accept a documentation patch describing Hyper's cancellation behavior?

I think Hyper is largely cancel safe:

  • dropping an HTTP/1 request causes the connection to be closed
  • dropping an HTTP/2 request leaves the shared connection in a good state and cancels the unwanted response (using RST_STREAM).
  • otherwise Hyper doesn't really have a bunch of hidden state to screw up
  • well, except the legacy Client support, but actually that's also carefully implemented to do the right thing on cancellation

I don't know about the server side, but that's OK, I can read code. If you're interested.

It doesn't seem like guide material. I was thinking a single # Cancel safety section at the crate level.

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