diff -r 38fac6d0521d -r 42208b2f224e src/java.net.http/share/classes/java/net/http/internal/frame/WindowUpdateFrame.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.net.http/share/classes/java/net/http/internal/frame/WindowUpdateFrame.java	Wed Feb 07 14:17:24 2018 +0000
@@ -0,0 +1,62 @@
+/*
+ * 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 class WindowUpdateFrame extends Http2Frame {
+
+    private final int windowUpdate;
+
+    public static final int TYPE = 0x8;
+
+    public WindowUpdateFrame(int streamid, int windowUpdate) {
+        super(streamid, 0);
+        this.windowUpdate = windowUpdate;
+    }
+
+    @Override
+    public int type() {
+        return TYPE;
+    }
+
+    @Override
+    int length() {
+        return 4;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(super.toString())
+          .append(" WindowUpdate: ")
+          .append(windowUpdate);
+        return sb.toString();
+    }
+
+    public int getUpdate() {
+        return this.windowUpdate;
+    }
+
+}