diff --git a/test/cspTest.js b/test/cspTest.js
index a12ef65..507e754 100644
--- a/test/cspTest.js
+++ b/test/cspTest.js
@@ -18,4 +18,11 @@ addLine("window name after set: " + window.name);
 	
 	const hashValue = await testAPI.hash(canvasAPI.fingerprint(window).url);
 	addLine("canvas hash: " + hashValue);
-}());
\ No newline at end of file
+}());
+
+document.getElementById("reloadWith304").addEventListener("click", function(){
+	"use strict";
+	
+	document.cookie = "304=1";
+	location.reload();
+});
\ No newline at end of file
diff --git a/test/cspTest.php b/test/cspTest.php
index f72f7cb..cc8737b 100644
--- a/test/cspTest.php
+++ b/test/cspTest.php
@@ -1,6 +1,12 @@
 <?php
-
-header("Content-Security-Policy: default-src 'none'; img-src 'self'; script-src 'self'; style-src 'self'");
+if (array_key_exists("304", $_COOKIE)){
+	http_response_code(304);
+	setcookie("304", "", time() - 1000);
+	die();
+}
+else {
+	header("Content-Security-Policy: default-src 'none'; img-src 'self'; script-src 'self'; style-src 'self'");
+}
 
 ?>
 <!DOCTYPE html>
@@ -18,11 +24,15 @@ header("Content-Security-Policy: default-src 'none'; img-src 'self'; script-src
 <ul>
 	<li>if the window API protection is active the window name at start is always empty</li>
 	<li>the canvas hash changes upon reload (depending on CanvasBlocker settings - e.g. not in the stealth preset)</li>
+	<li>there is no line saying "THIS SHOULD NOT BE VISIBLE!" when reloading with <a id="reloadWith304" href="">this</a> link</li>
 </ul>
 <h2>Tests</h2>
 <div id="results"></div>
 <script src="testAPI.js"></script>
 <script src="canvasAPI.js"></script>
 <script src="cspTest.js"></script>
+<script>
+	addLine("THIS SHOULD NOT BE VISIBLE!");
+</script>
 </body>
 </html>
\ No newline at end of file
