--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.net.http/share/classes/jdk/internal/net/http/common/ImmutableExtendedSSLSession.java	Wed Feb 14 16:04:18 2018 +0000
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 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.common;
+
+import java.security.Principal;
+import java.util.List;
+import javax.net.ssl.SSLSession;
+import javax.net.ssl.ExtendedSSLSession;
+import javax.net.ssl.SSLSessionContext;
+import javax.net.ssl.SSLPeerUnverifiedException;
+import javax.net.ssl.SNIServerName;
+
+/**
+ * All mutating methods throw UnsupportedOperationException
+ */
+public class ImmutableExtendedSSLSession extends ExtendedSSLSession {
+    private final ExtendedSSLSession delegate;
+
+    ImmutableExtendedSSLSession(ExtendedSSLSession session) {
+        this.delegate = session;
+    }
+
+    public byte[] getId() {
+        return delegate.getId();
+    }
+
+    public SSLSessionContext getSessionContext() {
+        return delegate.getSessionContext();
+    }
+
+    public long getCreationTime() {
+        return delegate.getCreationTime();
+    }
+
+    public long getLastAccessedTime() {
+        return delegate.getLastAccessedTime();
+    }
+
+    public void invalidate() {
+        throw new UnsupportedOperationException("session is not mutable");
+    }
+
+    public boolean isValid() {
+        return delegate.isValid();
+    }
+
+    public void putValue(String name, Object value) {
+        throw new UnsupportedOperationException("session is not mutable");
+    }
+
+    public Object getValue(String name) {
+        return delegate.getValue(name);
+    }
+
+    public void removeValue(String name) {
+        throw new UnsupportedOperationException("session is not mutable");
+    }
+
+    public String [] getValueNames() {
+        return delegate.getValueNames();
+    }
+
+    public java.security.cert.Certificate [] getPeerCertificates()
+            throws SSLPeerUnverifiedException {
+        return delegate.getPeerCertificates();
+    }
+
+    public java.security.cert.Certificate [] getLocalCertificates() {
+        return delegate.getLocalCertificates();
+    }
+
+    @Deprecated
+    public javax.security.cert.X509Certificate [] getPeerCertificateChain()
+            throws SSLPeerUnverifiedException {
+        return delegate.getPeerCertificateChain();
+    }
+
+    public Principal getPeerPrincipal()
+            throws SSLPeerUnverifiedException {
+        return delegate.getPeerPrincipal();
+    }
+
+    public Principal getLocalPrincipal() {
+        return delegate.getLocalPrincipal();
+    }
+
+    public String getCipherSuite() {
+        return delegate.getCipherSuite();
+    }
+
+    public String getProtocol() {
+        return delegate.getProtocol();
+    }
+
+    public String getPeerHost() {
+        return delegate.getPeerHost();
+    }
+
+    public int getPeerPort() {
+        return delegate.getPeerPort();
+    }
+
+    public int getPacketBufferSize() {
+        return delegate.getPacketBufferSize();
+    }
+
+    public int getApplicationBufferSize() {
+        return delegate.getApplicationBufferSize();
+    }
+
+    public String[] getLocalSupportedSignatureAlgorithms() {
+        return delegate.getLocalSupportedSignatureAlgorithms();
+    }
+
+    public String[] getPeerSupportedSignatureAlgorithms() {
+        return delegate.getPeerSupportedSignatureAlgorithms();
+    }
+
+    public List<SNIServerName> getRequestedServerNames()  {
+        return delegate.getRequestedServerNames();
+    }
+
+    public List<byte[]> getStatusResponses() {
+        return delegate.getStatusResponses();
+    }
+}