Change import to new golang.org/x/net/websocket.

package main

import (

	"code.google.com/p/go.net/websocket"

	"golang.org/x/net/websocket"

	"flag"

	"fmt"

	"io"

// maximum buffering of messages.

//

// The reason for using this custom implementation instead of

// code.google.com/p/go.net/websocket is that the latter has problems with long

// golang.org/x/net/websocket is that the latter has problems with long

// messages and does not support server subprotocols.

//   "Denial of Service Protection in Go HTTP Servers"

//   https://code.google.com/p/go/issues/detail?id=2093