--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.httpserver/share/classes/sun/net/httpserver/UnmodifiableHeaders.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2005, 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 sun.net.httpserver;
+
+import java.util.*;
+import com.sun.net.httpserver.*;
+
+class UnmodifiableHeaders extends Headers {
+
+        Headers map;
+
+        UnmodifiableHeaders(Headers map) {
+            this.map = map;
+        }
+
+        public int size() {return map.size();}
+
+        public boolean isEmpty() {return map.isEmpty();}
+
+        public boolean containsKey(Object key) {
+            return map.containsKey (key);
+        }
+
+        public boolean containsValue(Object value) {
+            return map.containsValue(value);
+        }
+
+        public List<String> get(Object key) {
+            return map.get(key);
+        }
+
+        public String getFirst (String key) {
+            return map.getFirst(key);
+        }
+
+
+        public List<String> put(String key, List<String> value) {
+            return map.put (key, value);
+        }
+
+        public void add (String key, String value) {
+            throw new UnsupportedOperationException ("unsupported operation");
+        }
+
+        public void set (String key, String value) {
+            throw new UnsupportedOperationException ("unsupported operation");
+        }
+
+        public List<String> remove(Object key) {
+            throw new UnsupportedOperationException ("unsupported operation");
+        }
+
+        public void putAll(Map<? extends String,? extends List<String>> t)  {
+            throw new UnsupportedOperationException ("unsupported operation");
+        }
+
+        public void clear() {
+            throw new UnsupportedOperationException ("unsupported operation");
+        }
+
+        public Set<String> keySet() {
+            return Collections.unmodifiableSet (map.keySet());
+        }
+
+        public Collection<List<String>> values() {
+            return Collections.unmodifiableCollection(map.values());
+        }
+
+        /* TODO check that contents of set are not modifable : security */
+
+        public Set<Map.Entry<String, List<String>>> entrySet() {
+            return Collections.unmodifiableSet (map.entrySet());
+        }
+
+        public boolean equals(Object o) {return map.equals(o);}
+
+        public int hashCode() {return map.hashCode();}
+    }