--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.net.http/share/classes/jdk/internal/net/http/websocket/StatusCodes.java	Wed Feb 07 21:45:37 2018 +0000
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.internal.net.http.websocket;
+
+/*
+ * Utilities for WebSocket status codes.
+ *
+ *     1. https://tools.ietf.org/html/rfc6455#section-7.4
+ *     2. http://www.iana.org/assignments/websocket/websocket.xhtml#close-code-number
+ */
+final class StatusCodes {
+
+    static final int PROTOCOL_ERROR    = 1002;
+    static final int NO_STATUS_CODE    = 1005;
+    static final int CLOSED_ABNORMALLY = 1006;
+    static final int NOT_CONSISTENT    = 1007;
+
+    private StatusCodes() { }
+
+    static boolean isLegalToSendFromClient(int code) {
+        if (!isLegal(code)) {
+            return false;
+        }
+        // Codes from unreserved range
+        if (code > 4999) {
+            return false;
+        }
+        // Codes below are not allowed to be sent using a WebSocket client API
+        switch (code) {
+            case PROTOCOL_ERROR:
+            case NOT_CONSISTENT:
+            case 1003:
+            case 1009:
+            case 1010:
+            case 1012:  // code sent by servers
+            case 1013:  // code sent by servers
+            case 1014:  // code sent by servers
+                return false;
+            default:
+                return true;
+        }
+    }
+
+    static boolean isLegalToReceiveFromServer(int code) {
+        if (!isLegal(code)) {
+            return false;
+        }
+        return code != 1010;  // code sent by clients
+    }
+
+    private static boolean isLegal(int code) {
+        // 2-byte unsigned integer excluding first 1000 numbers from the range
+        // [0, 999] which are never used
+        if (code < 1000 || code > 65535) {
+            return false;
+        }
+        // Codes from the range below has no known meaning under the WebSocket
+        // specification (i.e. unassigned/undefined)
+        if ((code >= 1016 && code <= 2999) || code == 1004) {
+            return false;
+        }
+        // Codes below cannot appear on the wire. It's always an error either
+        // to send a frame with such a code or to receive one.
+        switch (code) {
+            case NO_STATUS_CODE:
+            case CLOSED_ABNORMALLY:
+            case 1015:
+                return false;
+            default:
+                return true;
+        }
+    }
+}