code: @Nonnull
    public final UnifiedResponse setContentDispositionType (@Nonnull final EContentDispositionType eContentDispositionType)
    {
      ValueEnforcer.notNull (eContentDispositionType, "ContentDispositionType");
  
      m_eContentDispositionType = eContentDispositionType;
      return this;
    }
docs: Set the content disposition type (e.g. for PDF/Excel downloads). The
  default is {@link #DEFAULT_CONTENT_DISPOSITION_TYPE}. This value is only
  used if a content disposition filename is defined.
  
  @param eContentDispositionType
  The content disposition type to be used. May not be
  <code>null</code>.
  @return this
  @see #setContentDispositionFilename(String)