In order to get the 'not_modified' responses you should bypass the Query
mechanism the library provide and have responses from your server call your
own response handler.
To do so add a url parameter to your requests
&tqx=responseHandler:myQueryHandler
and then have code like

function myQueryHandler(response) {
  if (response.isError()) {
    // handle not modified
    // handle other errors
  }
  // handle valid response
}


Note  that you would also have to handle multiple responses in case you are
sending requests to more than one url.


HTH
ChartMan


On Wed, Aug 25, 2010 at 2:18 AM, Joel <[email protected]> wrote:

> How can I work with a 'not_modified' error?
>
> I need the ability to write that to the console log, or show a warning
> icon indicating the widget wasn't updated
> because the data hasn't changed.
>
> this.query.send(this.handleQueryResponse)
>
> the handleQueryResponse method never gets called on a 'not_modified'
> error
> but, is there a public way of accessing the response status message
> before they get passed to handleQueryResponse()
>
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