Get a read-only byte buffer containing the transport's pending output.
Once the client has finished getting from the output buffer, {@link #outputConsumed()}
must be called.
Successive calls to this method are not guaranteed to return the same object.
Once {@link #outputConsumed()} is called the buffer must not be used.
If the transport's state changes AFTER calling this method, this will not be
reflected in the output buffer.
Get a read-only byte buffer containing the transport's pending output. Once the client has finished getting from the output buffer, {@link #outputConsumed()} must be called.
Successive calls to this method are not guaranteed to return the same object. Once {@link #outputConsumed()} is called the buffer must not be used.
If the transport's state changes AFTER calling this method, this will not be reflected in the output buffer.