docs: public void debug() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "*** Begin Header Debug ***");
              HeaderElement elem = this.hdrSequence;
              while (null != elem) {
                  Tr.debug(tc, elem.getName() + ": " + elem.getDebugValue());
                  elem = elem.nextSequence;
              }
  
              Tr.debug(tc, "*** End Header Debug ***");
          }
      }