Http1 Server tail stage
TailStage capable of decoding requests, obtaining results from
the HttpService, rendering the response and, if possible,
restarting to continue serving requests on the this connection.
Keep-Alive is supported and managed automatically by this stage via the Http1ServerCodec
which examines the http version, and connection, content-length, and transfer-encoding
headers to determine if the connection can be reused for a subsequent dispatch.