Qual: Don't attempt HTTPS redirect if already using HTTPS

htdocs/main.inc.php

@@ -225,7 +225,8 @@ if (isset($_SERVER["HTTP_USER_AGENT"]))
 
 
 // Force HTTPS if required ($conf->file->main_force_https is 0/1 or https dolibarr root url)
-if (! empty($conf->file->main_force_https))
+// $_SERVER["HTTPS"] is 'on' when link is https, otherwise $_SERVER["HTTPS"] is empty or 'off'
+if (! empty($conf->file->main_force_https) && (empty($_SERVER["HTTPS"]) || $_SERVER["HTTPS"] != 'on'))
 {
     $newurl='';
     if (is_numeric($conf->file->main_force_https))
@@ -238,23 +239,15 @@ if (! empty($conf->file->main_force_https))
             }
         }
         else	// Check HTTPS environment variable (Apache/mod_ssl only)
-        {
-            // $_SERVER["HTTPS"] is 'on' when link is https, otherwise $_SERVER["HTTPS"] is empty or 'off'
-            if (empty($_SERVER["HTTPS"]) || $_SERVER["HTTPS"] != 'on')		// If link is http
         {
             $newurl=preg_replace('/^http:/i','https:',DOL_MAIN_URL_ROOT).$_SERVER["REQUEST_URI"];
         }
     }
-    }
     else
     {
         // Check HTTPS environment variable (Apache/mod_ssl only)
-        // $_SERVER["HTTPS"] is 'on' when link is https, otherwise $_SERVER["HTTPS"] is empty or 'off'
-        if (empty($_SERVER["HTTPS"]) || $_SERVER["HTTPS"] != 'on')		// If link is http
-        {
         $newurl=$conf->file->main_force_https.$_SERVER["REQUEST_URI"];
     }
-    }
     // Start redirect
     if ($newurl)
     {