fixed: header case sensivity

server.go

@@ -102,11 +102,11 @@ func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeade
 		return u.returnError(w, r, http.StatusBadRequest, "websocket: version != 13")
 	}
 
-	if !tokenListContainsValue(r.Header, "Connection", "upgrade") {
+	if strings.ToLower(r.Header.Get("Connection")) != "upgrade"
 		return u.returnError(w, r, http.StatusBadRequest, "websocket: connection header != upgrade")
 	}
 
-	if !tokenListContainsValue(r.Header, "Upgrade", "websocket") {
+	if strings.ToLower(r.Header.Get("Upgrade")) != "websocket"
 		return u.returnError(w, r, http.StatusBadRequest, "websocket: upgrade != websocket")
 	}
 

util.go

@@ -9,23 +9,8 @@ import (
 	"crypto/sha1"
 	"encoding/base64"
 	"io"
-	"net/http"
-	"strings"
 )
 
-// tokenListContainsValue returns true if the 1#token header with the given
-// name contains token.
-func tokenListContainsValue(header http.Header, name string, value string) bool {
-	for _, v := range header[name] {
-		for _, s := range strings.Split(v, ",") {
-			if strings.EqualFold(value, strings.TrimSpace(s)) {
-				return true
-			}
-		}
-	}
-	return false
-}
-
 var keyGUID = []byte("258EAFA5-E914-47DA-95CA-C5AB0DC85B11")
 
 func computeAcceptKey(challengeKey string) string {