arturobernalg commented on code in PR #501:
URL: 
https://github.com/apache/httpcomponents-client/pull/501#discussion_r1394735089


##########
httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/CacheKeyGenerator.java:
##########
@@ -201,6 +209,61 @@ public static List<String> variantNames(final 
MessageHeaders message) {
         return names;
     }
 
+    @Internal
+    public static void normalizeElements(final MessageHeaders message, final 
String headerName, final Consumer<String> consumer) {
+        // User-Agent as a special case due to its grammar
+        if (headerName.equalsIgnoreCase(HttpHeaders.USER_AGENT)) {
+            final Header header = message.getFirstHeader(headerName);
+            if (header != null) {
+                consumer.accept(header.getValue().toLowerCase(Locale.ROOT));
+            }
+        } else {
+            normalizeElements(message.headerIterator(headerName), consumer);
+        }
+    }
+
+    @Internal
+    public static void normalizeElements(final Iterator<Header> iterator, 
final Consumer<String> consumer) {
+        final List<HeaderElement> elements = new ArrayList<>();
+        final Iterator<HeaderElement> it = new 
BasicHeaderElementIterator(iterator);

Review Comment:
   > @arturobernalg Agreed. Corrected. Please take another look.
   
   Perfect. LGTM



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