Socket handler which is designed to detect a difference in protocol signatures very early on
in the connection to figure out which real handler to route to. This is used for performance
and backwards compatibility reasons to maintain Stetho having just one actual socket
connection despite dumpapp and DevTools now diverging in protocol.
Note this trick is only possible if the protocol requires that the client initiate the
conversation. Otherwise, the server would be expected to say something before we know what
protocol the client is speaking.