diff --git a/actions/DisplayAction.php b/actions/DisplayAction.php
index 24bdefe1..93813004 100644
--- a/actions/DisplayAction.php
+++ b/actions/DisplayAction.php
@@ -32,7 +32,7 @@ class DisplayAction implements ActionInterface
                     return new Response('', 304, ['last-modified' => $modificationTimeGMT . 'GMT']);
                 }
             }
-            return $cachedResponse;
+            return $cachedResponse->withHeader('rss-bridge', 'This is a cached response');
         }
 
         if (!$bridgeName) {
diff --git a/bridges/MediapartBlogsBridge.php b/bridges/MediapartBlogsBridge.php
index fa8c3d5f..d1e1c3c9 100644
--- a/bridges/MediapartBlogsBridge.php
+++ b/bridges/MediapartBlogsBridge.php
@@ -35,7 +35,12 @@ class MediapartBlogsBridge extends BridgeAbstract
 
             $item['title'] = $item_title->innertext;
             $item['uri'] = self::BASE_URI . trim($item_title->href);
-            $item['author'] = $element->find('.author .subscriber', 0)->innertext;
+
+            $author = $element->find('.author .subscriber', 0);
+            if ($author) {
+                $item['author'] = $author->innertext;
+            }
+
             $item['content'] = $item_divs[count($item_divs) - 2] . $item_divs[count($item_divs) - 1];
             $item['timestamp'] = strtotime($element->find('.author time', 0)->datetime);
 
diff --git a/lib/FeedItem.php b/lib/FeedItem.php
index bd37f119..fc4549a7 100644
--- a/lib/FeedItem.php
+++ b/lib/FeedItem.php
@@ -178,7 +178,6 @@ class FeedItem
         } else {
             $this->author = $author;
         }
-        return $this;
     }
 
     public function getContent(): ?string
@@ -284,7 +283,6 @@ class FeedItem
         } else {
             $this->misc[$name] = $value;
         }
-        return $this;
     }
 
     public function toArray(): array
diff --git a/lib/http.php b/lib/http.php
index e4f9bf48..39f0c727 100644
--- a/lib/http.php
+++ b/lib/http.php
@@ -331,7 +331,14 @@ final class Response
         return array_pop($header);
     }
 
-    public function withBody(string $body): Response
+    public function withHeader(string $name, string $value): self
+    {
+        $clone = clone $this;
+        $clone->headers[$name] = [$value];
+        return $clone;
+    }
+
+    public function withBody(string $body): self
     {
         $clone = clone $this;
         $clone->body = $body;