code: def wrap_json_body(func=None, *, preserve_raw_body=False):
      
  
      if func is None:
          return functools.partial(
              wrap_json_body,
              preserve_raw_body=preserve_raw_body
          )
  
      @functools.wraps(func)
      def wrapper(request, *args, **kwargs):
          ctype, pdict = parse_header(request.headers.get('Content-Type', ''))
          if preserve_raw_body:
              request.raw_body = request.body
          if ctype == "application/json":
              request.body = json.loads(request.body.decode("utf-8")) if request.body else None
          return func(request, *args, **kwargs)
      return wrapper
docs: A middleware that parses the body of json requests and
      add it to the request under the `body` attribute (replacing
      the previous value). Can preserve the original value in
      a new attribute `raw_body` if you give preserve_raw_body=True.