Return a copy of the underlying header values as a {@link MessageHeaders} object. <p>This method can be invoked many times, with modifications in between where each new call returns a fresh copy of the current header values. @since 4.1
See Implementation
Return a copy of the underlying header values as a {@link MessageHeaders} object. <p>This method can be invoked many times, with modifications in between where each new call returns a fresh copy of the current header values. @since 4.1