code: def should_return_304(self) -> bool:
          
          # If client sent If-None-Match, use it, ignore If-Modified-Since
          if self.request.headers.get("If-None-Match"):
              return self.check_etag_header()
  
          # Check the If-Modified-Since, and don't send the result if the
          # content has not been modified
          ims_value = self.request.headers.get("If-Modified-Since")
          if ims_value is not None:
              date_tuple = email.utils.parsedate(ims_value)
              if date_tuple is not None:
                  if_since = datetime.datetime(*date_tuple[:6])
                  assert self.modified is not None
                  if if_since >= self.modified:
                      return True
  
          return False
docs: Returns True if the headers indicate that we should return 304.
  
          .. versionadded:: 3.1