YAMAMOTO Takashi ee1f4fdcdb webclient: Don't call the sink callback if no data is available
This happened frequently for me with Docker Desktop's
/var/run/docker.sock on macOS.
But I believe it can happen on other environments, even with TCP.

Alternatively, this case can be handled by the callback
implementations.  But it's simpler to handle the corner case here.
2021-01-17 18:44:17 -08:00
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