code: @Nonnull
    public FineUploader5Request setEndpoint (@Nonnull final ISimpleURL aRequestEndpoint)
    {
      ValueEnforcer.notNull (aRequestEndpoint, "RequestEndpoint");
      m_aRequestEndpoint = aRequestEndpoint;
      return this;
    }
docs: The endpoint to send upload requests to.
  
  @param aRequestEndpoint
  The new action URL. May not be <code>null</code>.
  @return this