diff -r 8e1ed2a15845 -r 4690a2871b44 src/java.net.http/share/classes/jdk/internal/net/http/common/FlowTube.java
--- a/src/java.net.http/share/classes/jdk/internal/net/http/common/FlowTube.java	Wed May 02 10:47:16 2018 +0200
+++ b/src/java.net.http/share/classes/jdk/internal/net/http/common/FlowTube.java	Wed May 02 02:36:17 2018 -0700
@@ -63,6 +63,8 @@
          */
         default void dropSubscription() { }
 
+        default boolean supportsRecycling() { return false; }
+
     }
 
     /**