Use the given handler to handle this request. The workflow that is required may vary widely.
@param request current HTTP request
@param response current HTTP response
@param handler handler to use. This object must have previously been passedto the supports method of this interface, which must have returned true.
@throws Exception in case of errors
@return ModelAndView object with the name of the view and the requiredmodel data, or null if the request has been handled directly
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