code: @Override
      public void setReasonPhrase(String reason) {
          this.myReason = reason;
          this.myReasonBytes = GenericUtils.getEnglishBytes(reason);
          super.setFirstLineChanged();
          if (TraceComponent.isAnyTracingEnabled() && tc.isEventEnabled()) {
              Tr.event(tc, "setReasonPhrase(String): set to [" + this.myReason + "]");
          }
      }
docs: Set the reason phrase of this response message.
  
  @param reason