private void doBadPreambleHandling(String msg) throws IOException {
    doBadPreambleHandling(msg, new FatalConnectionException(msg));
  }
Has the request header and the request param and optionally encoded data buffer all in this one
array.
<p/>
Will be overridden in tests.
hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/ServerRpcConnection.java