Add P3P headers to avoid potential issues with IE

app/Core/Http/Response.php

@@ -128,6 +128,18 @@ class Response extends Base
         return $this;
     }
 
+    /**
+     * Add P3P headers for Internet Explorer
+     *
+     * @access public
+     * @return $this
+     */
+    public function withP3P()
+    {
+        $this->withHeader('P3P', 'CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"');
+        return $this;
+    }
+
     /**
      * Set HTTP response body
      *

app/Middleware/BootstrapMiddleware.php

@@ -32,6 +32,7 @@ class BootstrapMiddleware extends BaseMiddleware
     {
         $this->response->withContentSecurityPolicy($this->container['cspRules']);
         $this->response->withSecurityHeaders();
+        $this->response->withP3P();
 
         if (ENABLE_XFRAME) {
             $this->response->withXframe();