docs: @Nonnull
    public final UnifiedResponse setContent (@Nonnull final IHasInputStream aISP)
    {
      ValueEnforcer.notNull (aISP, "InputStreamProvider");
      if (hasContent ())
        logInfo ("Overwriting content with content provider!");
      m_aContentArray = null;
      m_nContentArrayOfs = -1;
      m_nContentArrayLength = -1;
      m_aContentISP = aISP;
      return this;
    }