--- /dev/null	2017-10-28 22:49:55.551349757 -0700
+++ new/test/jdk/java/net/httpclient/http2/server/Http2TestExchangeSupplier.java	2017-11-30 04:06:09.853491736 -0800
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2017, 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.
+ *
+ * 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.
+ */
+
+import javax.net.ssl.SSLSession;
+import java.io.InputStream;
+import java.net.URI;
+import jdk.incubator.http.internal.common.HttpHeadersImpl;
+
+/**
+ * A supplier of Http2TestExchanges. If the default Http2TestExchange impl is
+ * not sufficient, then a supplier may be set on an Http2TestServer through its
+ * {@link Http2TestServer#setExchangeSupplier(Http2TestExchangeSupplier)}.
+ *
+ * Useful for testing scenarios where non-standard or specific server behaviour
+ * is required, either direct control over the frames sent, "bad" behaviour, or
+ * something else.
+ */
+public interface Http2TestExchangeSupplier {
+
+    Http2TestExchange get(int streamid,
+                          String method,
+                          HttpHeadersImpl reqheaders,
+                          HttpHeadersImpl rspheaders,
+                          URI uri,
+                          InputStream is,
+                          SSLSession sslSession,
+                          BodyOutputStream os,
+                          Http2TestServerConnection conn,
+                          boolean pushAllowed);
+
+    static Http2TestExchangeSupplier ofDefault() {
+        return Http2TestExchangeImpl::new;
+    }
+}