code: def validate(**vkargs):
      
      depr('Use route wildcard filters instead.')
      def decorator(func):
          @functools.wraps(func)
          def wrapper(*args, **kargs):
              for key, value in vkargs.items():
                  if key not in kargs:
                      abort(403, 'Missing parameter: %s' % key)
                  try:
                      kargs[key] = value(kargs[key])
                  except ValueError:
                      abort(403, 'Wrong parameter format for: %s' % key)
              return func(*args, **kargs)
          return wrapper
      return decorator
docs: Validates and manipulates keyword arguments by user defined callables.
      Handles ValueError and missing arguments by raising HTTPError(403).