Thanks for this module - a very useful feature!
I have a couple of use cases for curl/async_http which are possibly off topic (major enhancements), I mention them here so that if any redesign/code sharing happens they are taken into account.

• Sending asynchronous queries without suspending main transaction
  • e.g. for sending logging/notifications where result is not important
  • would run an event_route on response so stats etc. can be updated
• Streaming multiple requests to the same destination
  • Avoid TLS handshake overhead for every request

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