You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: with_retry_after.go
    path of file: ./repos/kubernetes/staging/src/k8s.io/apiserver/pkg/server/filters
    
    the code of the file until where you have to start completion: /*
Copyright 2021 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package filters

import (
	"net/http"
	"strings"
)

var (
	// health probes and metrics scraping are never rejected, w
    
func withRetryAfter(handler http.Handler, isRequestExemptFn isRequestExemptFunc, shouldRespondWithRetryAfterFn shouldRespondWithRetryAfterFunc) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
		params, send := shouldRespondWithRetryAfterFn()
		if !send || isRequestExemptFn(req) {
			handler.ServeHTTP(w, req)
			return
		}

		// If we are here this means it's time to send Retry-After response
		//
		// Copied from net/http2 library
		// "Connection" headers aren't allowed in HTTP/2 (RFC 7540, 8.1.2.2),
		// but respect "Connection" == "close" to mean sending a GOAWAY and tearing
		// down the TCP connection when idle, like we do for HTTP/1.
		if params.TearDownConnection {
			w.Header().Set("Connection", "close")
		}

		// Return a 429 status asking the client to try again after 5 seconds
		w.Header().Set("Retry-After", "5")
		http.Error(w, params.Message, http.StatusTooManyRequests)
	})
}