code: @Nonnull
    public FineUploaderBasic setEndpoint (@Nonnull final ISimpleURL aRequestEndpoint)
    {
      m_aRequestEndpoint = ValueEnforcer.notNull (aRequestEndpoint, "RequestEndpoint");
      return this;
    }
docs: The is the endpoint used by both the form and ajax uploader. In the case of
  the form uploader, it is part of the form's action attribute value along with
  all parameters. In the case of the ajax uploader, it is makes up part of the
  URL of the XHR request (again, along with the parameters).
  
  @param aRequestEndpoint
  The new action URL. May not be <code>null</code>.
  @return this