Creates an abstraction over UDP Conn for origin "connection" which can
be useful for future support of complex protocols that may require
changing ports during protocol negotiation (eg. SIP, TFTP)
In addition, it removes a dependency from ingress on connection package.
Go's client defaults to chunked encoding after a 200ms delay if the following cases are true:
* the request body blocks
* the content length is not set (or set to -1)
* the method doesn't usually have a body (GET, HEAD, DELETE, ...)
* there is no transfer-encoding=chunked already set.
So for non websocket requests, if transfer-encoding isn't chunked and content length is 0, we dont set a request body.
ServeControlStream accidentally became non-blocking in the last quic
change causing stream to not be returned until a SIGTERM was received.
This change makes ServeControlStream be non-blocking for QUIC streams.
cthuang
João Oliveirinha
Sudarsan Reddy