[Modify] Polish it

websocket-sharp/Server/HttpServer.cs

@@ -1376,18 +1376,9 @@ namespace WebSocketSharp.Server
       if (path.Length == 0)
         throw new ArgumentException ("An empty string.", "path");
 
-      if (path.IndexOf (':') > -1)
-        throw new ArgumentException ("It contains ':'.", "path");
-
       if (path.IndexOf ("..") > -1)
         throw new ArgumentException ("It contains '..'.", "path");
 
-      if (path.IndexOf ("//") > -1)
-        throw new ArgumentException ("It contains '//'.", "path");
-
-      if (path.IndexOf ("\\\\") > -1)
-        throw new ArgumentException ("It contains '\\\\'.", "path");
-
       path = createFilePath (path);
       return File.Exists (path) ? File.ReadAllBytes (path) : null;
     }