--- a/src/java.net.http/share/classes/jdk/internal/net/http/common/Utils.java	Wed Jun 13 15:45:27 2018 +0100
+++ b/src/java.net.http/share/classes/jdk/internal/net/http/common/Utils.java	Wed Jun 13 19:11:47 2018 +0100
@@ -59,9 +59,11 @@
 import java.util.List;
 import java.util.Set;
 import java.util.TreeSet;
+import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
 import java.util.concurrent.ExecutionException;
 import java.util.function.BiPredicate;
+import java.util.function.Function;
 import java.util.function.Predicate;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
@@ -180,6 +182,17 @@
                                 .collect(Collectors.toUnmodifiableSet());
     }
 
+    public static <T> CompletableFuture<T> wrapForDebug(Logger logger, String name, CompletableFuture<T> cf) {
+        if (logger.on()) {
+            return cf.handle((r,t) -> {
+                logger.log("%s completed %s", name, t == null ? "successfully" : t );
+                return cf;
+            }).thenCompose(Function.identity());
+        } else {
+            return cf;
+        }
+    }
+
     private static final String WSPACES = " \t\r\n";
     private static final boolean isAllowedForProxy(String name,
                                                    String value,