fix fabric8io#4201: jetty's bytebuffers may be immediately re-used

httpclient-jetty/src/main/java/io/fabric8/kubernetes/client/jetty/JettyAsyncResponseListener.java

@@ -94,12 +94,20 @@ public void onContent(Response response, LongConsumer demand, ByteBuffer content
       this.demand.complete(demand);
     }
     try {
-      bodyConsumer.consume(process(response, content), this);
+      // we must clone as the buffer can be reused after the call to succeeded
+      bodyConsumer.consume(process(response, clone(content)), this);
       callback.succeeded();
     } catch (Exception e) {
       callback.failed(e);
     }
   }
 
   protected abstract T process(Response response, ByteBuffer content);
+
+  public static ByteBuffer clone(ByteBuffer original) {
+    ByteBuffer clone = ByteBuffer.allocate(original.remaining());
+    clone.put(original);
+    clone.flip();
+    return clone;
+  }
 }

kubernetes-client-api/src/main/java/io/fabric8/kubernetes/client/http/HttpClient.java

@@ -199,6 +199,8 @@ default <T> CompletableFuture<HttpResponse<T>> sendAsync(HttpRequest request, Cl
 
   /**
    * Send a request and consume the bytes of the resulting response body
+   * <p>
+   * HtttpClient implementations will provide ByteBuffers that may be held directly.
    *
    * @param request the HttpRequest to send
    * @param consumer the response body consumer