src/java.httpclient/share/classes/java/net/http/ResponseHeaders.java

@@ -46,11 +46,11 @@
  * The location of "Content-length" is recorded explicitly. Similar approach
  * could be taken for other common headers.
  *
  * This class is not thread-safe
  */
-class ResponseHeaders implements HttpHeaders1 {
+class ResponseHeaders implements HttpHeaders {
 
     static final int DATA_SIZE = 16 * 1024;  // initial space for headers
     static final int NUM_HEADERS = 50; // initial expected max number of headers
 
     final HttpConnection connection;

@@ -366,14 +366,10 @@
             l = populateMapEntry(name);
         }
         return Collections.unmodifiableList(l);
     }
 
-    @Override
-    public void makeUnmodifiable() {
-    }
-
     // Delegates map to HashMap but converts keys to lower case
 
     static class HeaderMap implements Map<String,List<String>> {
         Map<String,List<String>> inner;