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Request URL: http://www.minenergia.gov.co/documents/10192/23864799/020317_reporte_coberturas_2016_iii_glp.pdf/0b985f45-52cc-4f4e-97f9-768b84790ae5
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You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.