--- a/src/java.base/share/classes/sun/net/www/MessageHeader.java	Fri Aug 30 13:11:16 2019 +0100
+++ b/src/java.base/share/classes/sun/net/www/MessageHeader.java	Fri Aug 30 15:42:27 2019 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1995, 2019, 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
@@ -311,12 +311,23 @@
         return (k.substring(i+1, len-3).equalsIgnoreCase("HTTP/"));
     }
 
+    /** Prints the key-value pairs represented by this
+        header. Also prints the RFC required blank line
+        at the end. Omits pairs with a null key. Omits
+        colon if key-value pair is the requestline. */
+    public void print(PrintStream p) {
+        // no synchronization: use cloned arrays instead.
+        String[] k; String[] v; int n;
+        synchronized (this) { n = nkeys; k = keys.clone(); v = values.clone(); }
+        print(n, k, v, p);
+    }
+
 
     /** Prints the key-value pairs represented by this
         header. Also prints the RFC required blank line
         at the end. Omits pairs with a null key. Omits
         colon if key-value pair is the requestline. */
-    public synchronized void print(PrintStream p) {
+    private  void print(int nkeys, String[] keys, String[] values, PrintStream p) {
         for (int i = 0; i < nkeys; i++)
             if (keys[i] != null) {
                 StringBuilder sb = new StringBuilder(keys[i]);