--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.net.http/share/classes/java/net/http/internal/frame/ErrorFrame.java	Wed Feb 07 14:17:24 2018 +0000
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2015, 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 java.net.http.internal.frame;
+
+public abstract class ErrorFrame extends Http2Frame {
+
+    // error codes
+    public static final int NO_ERROR = 0x0;
+    public static final int PROTOCOL_ERROR = 0x1;
+    public static final int INTERNAL_ERROR = 0x2;
+    public static final int FLOW_CONTROL_ERROR = 0x3;
+    public static final int SETTINGS_TIMEOUT = 0x4;
+    public static final int STREAM_CLOSED = 0x5;
+    public static final int FRAME_SIZE_ERROR = 0x6;
+    public static final int REFUSED_STREAM = 0x7;
+    public static final int CANCEL = 0x8;
+    public static final int COMPRESSION_ERROR = 0x9;
+    public static final int CONNECT_ERROR = 0xa;
+    public static final int ENHANCE_YOUR_CALM = 0xb;
+    public static final int INADEQUATE_SECURITY = 0xc;
+    public static final int HTTP_1_1_REQUIRED = 0xd;
+    static final int LAST_ERROR = 0xd;
+
+    static final String[] errorStrings = {
+        "Not an error",
+        "Protocol error",
+        "Internal error",
+        "Flow control error",
+        "Settings timeout",
+        "Stream is closed",
+        "Frame size error",
+        "Stream not processed",
+        "Stream cancelled",
+        "Compression state not updated",
+        "TCP Connection error on CONNECT",
+        "Processing capacity exceeded",
+        "Negotiated TLS parameters not acceptable",
+        "Use HTTP/1.1 for request"
+    };
+
+    public static String stringForCode(int code) {
+        if (code < 0) {
+            throw new IllegalArgumentException();
+        }
+
+        if (code > LAST_ERROR) {
+            return "Error: " + Integer.toString(code);
+        } else {
+            return errorStrings[code];
+        }
+    }
+
+    int errorCode;
+
+    public ErrorFrame(int streamid, int flags, int errorCode) {
+        super(streamid, flags);
+        this.errorCode = errorCode;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() + " Error: " + stringForCode(errorCode);
+    }
+
+    public int getErrorCode() {
+        return this.errorCode;
+    }
+}