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: not_go16.go
    path of file: ./repos/go-starter-kit/vendor/golang.org/x/net/http2
    
    the code of the file until where you have to start completion: // Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build !go1.6

package http2

import (
	"crypto/tls"
	"net/http"
	"time"
)

func configureTransport(t1 *http.Transport) (*Transport, error) {
	return nil, errTransportVersion
}

func transportExpectContinueTimeout(t1 *http.Transport) time.Duration {
	return 0

}

// isBadCipher reports whether the cipher is blacklisted by the HTTP/2 spec.
func isBadCipher(cipher uint16) b
    
func isBadCipher(cipher uint16) bool {
	switch cipher {
	case tls.TLS_RSA_WITH_RC4_128_SHA,
		tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
		tls.TLS_RSA_WITH_AES_128_CBC_SHA,
		tls.TLS_RSA_WITH_AES_256_CBC_SHA,
		tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
		tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
		tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
		tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA,
		tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
		tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
		tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:
		// Reject cipher suites from Appendix A.
		// "This list includes those cipher suites that do not
		// offer an ephemeral key exchange and those that are
		// based on the TLS null, stream or block cipher type"
		return true
	default:
		return false
	}
}