What does the result page look like when you request it in a browser, specifically the headers? If the site has a form that you can submit for a normal search request, you may want to look at the source of that form page as well to see what they send along.

It looks like maybe they are doing some sort of detection and incorrectly assuming you re-submitted an old form?

In reply to Re^3: Submitting queries to server by cbrandtbuffalo
in thread Submitting queries to server by Anonymous Monk

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