code: def url_for(
          endpoint: str,
          *,
          _anchor: Optional[str]=None,
          _external: Optional[bool]=None,
          _method: Optional[str]=None,
          _scheme: Optional[str]=None,
          **values: Any,
  ) -> str:
      
      app_context = _app_ctx_stack.top
      request_context = _request_ctx_stack.top
  
      if request_context is not None:
          url_adapter = request_context.url_adapter
          if endpoint.startswith('.'):
              if request.blueprint is not None:
                  endpoint = request.blueprint + endpoint
              else:
                  endpoint = endpoint[1:]
          if _external is None:
              _external = False
      elif app_context is not None:
          url_adapter = app_context.url_adapter
          if _external is None:
              _external = True
      else:
          raise RuntimeError('Cannot create a url outside of an application context')
  
      if url_adapter is None:
          raise RuntimeError(
              'Unable to create a url adapter, try setting the the SERVER_NAME config variable.'
          )
      if _scheme is not None and not _external:
          raise ValueError('External must be True for scheme usage')
  
      app_context.app.inject_url_defaults(endpoint, values)
      try:
          url = url_adapter.build(
              endpoint, values, method=_method, scheme=_scheme, external=_external,
          )
      except BuildError as error:
          return app_context.app.handle_url_build_error(error, endpoint, values)
  
      if _anchor is not None:
          quoted_anchor = quote(_anchor)
          url = f"{url}#{quoted_anchor}"
      return url
docs: Return the url for a specific endpoint.
  
      This is most useful in templates and redirects to create a URL
      that can be used in the browser.
  
      Arguments:
          endpoint: The endpoint to build a url for, if prefixed with
              ``.`` it targets endpoint's in the current blueprint.
          _anchor: Additional anchor text to append (i.e. #text).
          _external: Return an absolute url for external (to app) usage.
          _method: The method to consider alongside the endpoint.
          _scheme: A specific scheme to use.
          values: The values to build into the URL, as specified in
              the endpoint rule.