400 Bad Request

The server could not comply with the request since it is either malformed or otherwise incorrect.

Cannot decode URL parameter keywords: ['kategorie_themen%3AStrahlung%2Bkategorie_themen%3AStoffe%2Bkategorie_themen%3ALuft%2Bkategorie_themen%3AChemikalien-Gesetzgebung%2Bkategorie_themen%3ABoden']