diff -r 8e1ed2a15845 -r 4690a2871b44 src/java.net.http/share/classes/jdk/internal/net/http/hpack/StringWriter.java
--- a/src/java.net.http/share/classes/jdk/internal/net/http/hpack/StringWriter.java	Wed May 02 10:47:16 2018 +0200
+++ b/src/java.net.http/share/classes/jdk/internal/net/http/hpack/StringWriter.java	Wed May 02 02:36:17 2018 -0700
@@ -52,7 +52,7 @@
     private static final int DONE           = 4;
 
     private final IntegerWriter intWriter = new IntegerWriter();
-    private final Huffman.Writer huffmanWriter = new Huffman.Writer();
+    private final Huffman.Writer huffmanWriter = new QuickHuffman.Writer();
     private final ISO_8859_1.Writer plainWriter = new ISO_8859_1.Writer();
 
     private int state = NEW;
@@ -76,7 +76,7 @@
             intWriter.configure(end - start, 7, 0b0000_0000);
         } else {
             huffmanWriter.from(input, start, end);
-            intWriter.configure(Huffman.INSTANCE.lengthOf(input, start, end),
+            intWriter.configure(huffmanWriter.lengthOf(input, start, end),
                     7, 0b1000_0000);
         }