code review 4607052: os.Error API: don't export os.ErrorString, use os.NewEr...

src/pkg/websocket/client.go

 // Copyright 2009 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.
 
 package websocket
 
 import (
         "bufio"
         "bytes"
         "container/vector"
         "crypto/tls"
         "fmt"
         "http"
         "io"
         "net"
         "os"
         "rand"
         "strings"
 )
 
 type ProtocolError struct {
         ErrorString string
 }
 
-func (err ProtocolError) String() string { return string(err.ErrorString) }
+func (err *ProtocolError) String() string { return string(err.ErrorString) }
 
 var (
         ErrBadScheme            = &ProtocolError{"bad scheme"}
         ErrBadStatus            = &ProtocolError{"bad status"}
         ErrBadUpgrade           = &ProtocolError{"missing or bad upgrade"}
         ErrBadWebSocketOrigin   = &ProtocolError{"missing or bad WebSocket-Origin"}
         ErrBadWebSocketLocation = &ProtocolError{"missing or bad WebSocket-Location"}
         ErrBadWebSocketProtocol = &ProtocolError{"missing or bad WebSocket-Protocol"}
         ErrChallengeResponse    = &ProtocolError{"mismatch challenge/response"}
         secKeyRandomChars       [0x30 - 0x21 + 0x7F - 0x3A]byte
@@ skipping 278 matching lines @@
                 return ErrBadWebSocketOrigin
         }
         if resp.Header.Get("Websocket-Location") != location {
                 return ErrBadWebSocketLocation
         }
         if protocol != "" && resp.Header.Get("Websocket-Protocol") != protocol {
                 return ErrBadWebSocketProtocol
         }
         return
 }