--- a/src/Adapter/Assets/AssetUrlGeneratorTrait.php
+++ b/src/Adapter/Assets/AssetUrlGeneratorTrait.php
@@ -49,12 +49,14 @@ trait AssetUrlGeneratorTrait
     protected function getFQDN()
     {
         if (null === $this->fqdn) {
-            if ($this->configuration->get('PS_SSL_ENABLED') && ToolsLegacy::usingSecureMode()) {
-                $this->fqdn = $this->configuration->get('_PS_BASE_URL_SSL_');
-            } else {
+            // EduBox: rely on the current request security, not on PS_SSL_ENABLED.
+            // Behind the reverse proxy every public request is HTTPS.
+            if (ToolsLegacy::usingSecureMode()) {
+                $this->fqdn = $this->configuration->get('_PS_BASE_URL_SSL_') ?: $this->configuration->get('_PS_BASE_URL_');
+            } else {
                 $this->fqdn = $this->configuration->get('_PS_BASE_URL_');
             }
         }
 
         return $this->fqdn;
     }