}
  }

  companion object {
    val logger: Logger = Logger.getLogger(Http2Server::class.java.name)

    @JvmStatic
    fun main(args: Array<String>) {
      if (args.size != 1 || args[0].startsWith("-")) {
        println("Usage: Http2Server <base directory>")
        return
      }
      val server =
        Http2Server(
          File(args[0]),
          localhost().sslContext().socketFactory,

	_, ok := err.(interface{ IsHTTP2NoCachedConnError() })
	return ok
}

type http2Server struct {
	NewWriteScheduler func() http2WriteScheduler
}

type http2WriteScheduler any

func http2NewPriorityWriteScheduler(any) http2WriteScheduler { panic(noHTTP2) }

func http2ConfigureServer(s *Server, conf *http2Server) error { panic(noHTTP2) }

var http2ErrNoCachedConn = http2noCachedConnError{}

// opt back in to the original. For example GODEBUG=http2server=0 disables
// HTTP/2 support in the net/http server.
//
// In typical usage, code should declare a Setting as a global
// and then call Value each time the current setting value is needed:
//
//	var http2server = godebug.New("http2server")
//
//	func ServeConn(c net.Conn) {
//		if http2server.Value() == "0" {
//			disallow HTTP/2
//			...
//		}
//		...

	{Name: "gocacheverify", Package: "cmd/go"},
	{Name: "gotypesalias", Package: "go/types", Changed: 23, Old: "0"},
	{Name: "http2client", Package: "net/http"},
	{Name: "http2debug", Package: "net/http", Opaque: true},
	{Name: "http2server", Package: "net/http"},
	{Name: "httplaxcontentlength", Package: "net/http", Changed: 22, Old: "1"},
	{Name: "httpmuxgo121", Package: "net/http", Changed: 22, Old: "1"},
	{Name: "installgoroot", Package: "go/build"},

[Server.TLSNextProto] (for servers) to a non-nil, empty
map. Alternatively, the following GODEBUG settings are
currently supported:

	GODEBUG=http2client=0  # disable HTTP/2 client support
	GODEBUG=http2server=0  # disable HTTP/2 server support
	GODEBUG=http2debug=1   # enable verbose HTTP/2 debug logs
	GODEBUG=http2debug=2   # ... even more verbose, with frame dumps

The environment variable `GODEBUG`
can hold a comma-separated list of these settings.
For example, if a Go program is running in an environment that contains

	GODEBUG=http2client=0,http2server=0

then that Go program will disable the use of HTTP/2 by default in both
the HTTP client and the HTTP server.
It is also possible to set the default `GODEBUG` for a given program
(discussed below).

	}
	wantSym := map[string]bool{
		// Verify these exist: (sanity checking this test)
		"net/http.(*Client).do":           true,
		"net/http.(*Transport).RoundTrip": true,

		// Verify these don't exist:
		"net/http.http2Server":           false,
		"net/http.(*Server).Serve":       false,
		"net/http.(*ServeMux).ServeHTTP": false,
		"net/http.DefaultServeMux":       false,
	}
	for sym, want := range wantSym {

}

var http2sorterPool = sync.Pool{New: func() interface{} { return new(http2sorter) }}

type http2sorter struct {
	v []string // owned by sorter
}

func (s *http2sorter) Len() int { return len(s.v) }

func (s *http2sorter) Swap(i, j int) { s.v[i], s.v[j] = s.v[j], s.v[i] }

func (s *http2sorter) Less(i, j int) bool { return s.v[i] < s.v[j] }

// Keys returns the sorted keys of h.

		package due to a non-default GODEBUG=http2client=... setting.

	/godebug/non-default-behavior/http2server:events
		The number of non-default behaviors executed by the net/http
		package due to a non-default GODEBUG=http2server=... setting.

	/godebug/non-default-behavior/httplaxcontentlength:events
		The number of non-default behaviors executed by the net/http
		package due to a non-default GODEBUG=httplaxcontentlength=...
		setting.

	}
}

var http2server = godebug.New("http2server")

// onceSetNextProtoDefaults configures HTTP/2, if the user hasn't
// configured otherwise. (by setting srv.TLSNextProto non-nil)
// It must only be called via srv.nextProtoOnce (use srv.setupHTTP2_*).
func (srv *Server) onceSetNextProtoDefaults() {
	if omitBundledHTTP2 {
		return
	}
	if http2server.Value() == "0" {