Improve message on RemoteProtocolError exception when server disconnects without sending a response
#313
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Refs: encode/httpx#1478
Currently if the server is in a listening state, then disconnects without sending a response, then users will see the following error...
Which really isn't informative as an end-user. We probably would prefer to special case this particular transition as a
ConnectError. It's not quite the same as a networkConnectError, since it occurs in cases where the connection was already established and hanging around, but is closed once it an incoming request is sent.It's not super obvious if we want to treat this case as a
ConnectErroror something else. Here's our existing hierarchy in this area...