arturobernalg commented on code in PR #460:
URL: 
https://github.com/apache/httpcomponents-client/pull/460#discussion_r1237701517


##########
httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/CacheKeyGenerator.java:
##########
@@ -94,18 +96,67 @@ public String generateKey(final HttpHost host, final 
HttpRequest request) {
         }
     }
 
-    private String getFullHeaderValue(final Header[] headers) {
-        if (headers == null) {
-            return "";
+    /**
+     * Returns all variant names contained in {@literal VARY} headers of the 
given message.
+     *
+     * @since 5.3
+     */
+    public static List<String> variantNames(final MessageHeaders message) {
+        if (message == null) {
+            return null;
+        }
+        if (!message.containsHeader(HttpHeaders.VARY)) {

Review Comment:
   @ok2c 
   Fair enough. Please inform me when the PR is ready to be merged, or feel 
free to do it yourself , the change-set Looks good to me.



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