Google Doc Contradiction: Is "not_modified" an error, or is it a warning?

[Daniel Norton]

The protocol document usually says that the "not_modified" response is an error, but in at least one place, it says it's a warning.

For those who know from direct experience (no assuming, please), which does the Google Chart widget actually expect?

From http://code.google.com/apis/chart/interactive/docs/dev/implementing_data_source.htm

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Optimizing JSON Responses

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• If the data has not changed from the previous request, the data source sends back status=warning, reason=not_modified,sig=old_sig_value.

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[EZChart]

You should use an error (although it will work even if you send it as a warning). The reasoning behind sending an error is that you do not return any data.

We will fix the documentation.

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