Close http connections immediately on disconnect #115
Merged
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Fixes #114.
This now ensures the http connection is properly closed when disconnecting, before killing the Isolate.
This waits for any requests in progress, since closing the http client while the request is starting causes unpredictable uncaught errors.
It is tricky to cover all cases, but the tests do a fairly good job of checking them. This PR also improves the connection counting in tests, avoiding some sporadic test failures we had previously.