type SpdyRoundTripper struct {
	//tlsConfig holds the TLS configuration settings to use when connecting
	//to the remote server.
	tlsConfig *tls.Config

	/* TODO according to http://golang.org/pkg/net/http/#RoundTripper, a RoundTripper
	   must be safe for use by multiple concurrent goroutines. If this is absolutely
	   necessary, we could keep a map from http.Request to net.Conn. In practice,

package http

import (
	"fmt"
	"io"
	"io/fs"
)

// fileTransport implements RoundTripper for the 'file' protocol.
type fileTransport struct {
	fh fileHandler
}

// NewFileTransport returns a new [RoundTripper], serving the provided
// [FileSystem]. The returned RoundTripper ignores the URL host in its
// incoming requests, as well as most other properties of the
// request.
//

	"strings"
	"sync"
	"time"
)

const defaultFlushInterval = time.Duration(100) * time.Millisecond

// Forwarder forwards all incoming HTTP requests to configured transport.
type Forwarder struct {
	RoundTripper http.RoundTripper
	PassHost     bool
	Logger       func(error)
	ErrorHandler func(http.ResponseWriter, *http.Request, error)

	// internal variables
	rewriter *headerRewriter
}

//go:linkname badRoundTrip net/http.(*Transport).RoundTrip
func badRoundTrip(*Transport, *Request) (*Response, error)

// RoundTrip implements the [RoundTripper] interface.
//
// For higher-level HTTP client support (such as handling of cookies
// and redirects), see [Get], [Post], and the [Client] type.
//
// Like the RoundTripper interface, the error types returned
// by RoundTrip are unspecified.
func (t *Transport) RoundTrip(req *Request) (*Response, error) {

	}
}

// CancelRequest is propagated to the Delegate RoundTripper within
// if the wrapped RoundTripper implements this function.
func (c *CommandHeaderRoundTripper) CancelRequest(req *http.Request) {
	type canceler interface {
		CancelRequest(*http.Request)
	}
	// If possible, call "CancelRequest" on the wrapped Delegate RoundTripper.
	if cr, ok := c.Delegate.(canceler); ok {
		cr.CancelRequest(req)
	}

	return makeTransport(config, false)
}

// MakeInsecureTransport creates an insecure RoundTripper for HTTP Transport.
func MakeInsecureTransport(config *KubeletClientConfig) (http.RoundTripper, error) {
	return makeTransport(config, true)
}

// makeTransport creates a RoundTripper for HTTP Transport.
func makeTransport(config *KubeletClientConfig, insecureSkipTLSVerify bool) (http.RoundTripper, error) {

	hopID uint32
	endID uint32
}

type roundTripper struct {
	promise map[transactionID]Promise[*ByteBuffer]
	host    string
	realm   string
}

func (r *roundTripper) OriginHost() string {
	return r.host
}
func (r *roundTripper) OriginRealm() string {
	return r.realm
}

func NewInboundHandler(host string, realm string, productName string) InboundHandler {

//     This indicates that this binary run with the GODEBUG=x509sha1=1 in env
func NewDeprecatedCertificateRoundTripperWrapperConstructor(missingSAN, sha1 *metrics.Counter) func(rt http.RoundTripper) http.RoundTripper {
	return func(rt http.RoundTripper) http.RoundTripper {
		return &x509DeprecatedCertificateMetricsRTWrapper{
			rt: rt,
			checkers: []deprecatedCertificateAttributeChecker{
				NewSANDeprecatedChecker(missingSAN),

}

func newHTTP3TransportGetter(cfg *Config) (httpTransportGetter, func()) {
	newConn := func() *http3.RoundTripper {
		return &http3.RoundTripper{
			TLSClientConfig: cfg.tlsConfig,
			QUICConfig:      &quic.Config{},
		}
	}
	closeFn := func(conn *http3.RoundTripper) func() {
		return func() {
			_ = conn.Close()
		}
	}
	noCloseFn := func() {}

	if cfg.newConnectionPerRequest {

type upgradeRequestRoundTripper struct {
	http.RoundTripper
	upgrader http.RoundTripper
}

var (
	_ UpgradeRequestRoundTripper  = &upgradeRequestRoundTripper{}
	_ utilnet.RoundTripperWrapper = &upgradeRequestRoundTripper{}
)

// WrappedRoundTripper returns the round tripper that a caller would use.
func (rt *upgradeRequestRoundTripper) WrappedRoundTripper() http.RoundTripper {
	return rt.RoundTripper
}