diff --git a/src/Output/AbstractOutput.php b/src/Output/AbstractOutput.php
new file mode 100644
index 0000000..ce67652
--- /dev/null
+++ b/src/Output/AbstractOutput.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace StaticMapLite\Output;
+
+abstract class AbstractOutput implements OutputInterface
+{
+    public function sendHeader(): OutputInterface
+    {
+        header('Content-Type: image/png');
+        $expires = 60 * 60 * 24 * 14;
+        header('Pragma: public');
+        header('Cache-Control: maxage=' . $expires);
+        header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $expires) . ' GMT');
+
+        return $this;
+    }
+}
diff --git a/src/Output/CacheOutput.php b/src/Output/CacheOutput.php
index 05ae895..5628f80 100644
--- a/src/Output/CacheOutput.php
+++ b/src/Output/CacheOutput.php
@@ -2,7 +2,7 @@
 
 namespace StaticMapLite\Output;
 
-class CacheOutput implements OutputInterface
+class CacheOutput extends AbstractOutput
 {
     protected $filename;
 
@@ -13,17 +13,6 @@ class CacheOutput implements OutputInterface
         return $this;
     }
 
-    public function sendHeader(): OutputInterface
-    {
-        header('Content-Type: image/png');
-        $expires = 60 * 60 * 24 * 14;
-        header('Pragma: public');
-        header('Cache-Control: maxage=' . $expires);
-        header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $expires) . ' GMT');
-
-        return $this;
-    }
-
     public function sendImage(): void
     {
         echo file_get_contents($this->filename);
diff --git a/src/Output/ImageOutput.php b/src/Output/ImageOutput.php
index 3a86cbb..38243bd 100644
--- a/src/Output/ImageOutput.php
+++ b/src/Output/ImageOutput.php
@@ -2,7 +2,7 @@
 
 namespace StaticMapLite\Output;
 
-class ImageOutput implements OutputInterface
+class ImageOutput extends AbstractOutput
 {
     protected $image;
 
@@ -13,17 +13,6 @@ class ImageOutput implements OutputInterface
         return $this;
     }
 
-    public function sendHeader(): OutputInterface
-    {
-        header('Content-Type: image/png');
-        $expires = 60 * 60 * 24 * 14;
-        header('Pragma: public');
-        header('Cache-Control: maxage=' . $expires);
-        header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $expires) . ' GMT');
-
-        return $this;
-    }
-
     public function sendImage(): bool
     {
         return imagepng($this->image);
diff --git a/src/Output/OutputInterface.php b/src/Output/OutputInterface.php
index 1bbbca6..4b3e16e 100644
--- a/src/Output/OutputInterface.php
+++ b/src/Output/OutputInterface.php
@@ -4,5 +4,6 @@ namespace StaticMapLite\Output;
 
 interface OutputInterface
 {
-
+    public function sendHeader();
+    public function sendImage();
 }