Represents a transport back-channel.
When the JAX-WS runtime finds out that the request {@link Packet} being processed is known not to producea response, it invokes the {@link #close()} methodto indicate that the transport does not need to keep the channel for the response message open.
This allows the transport to close down the communication channel sooner than wainting for {@link PipeHead#process}method to return, thereby improving the overall throughput of the system.
@author Kohsuke Kawaguchi
@author Jitu