 configuring error responses including 403404 pages goal set up your site to respond appropriately to site errors including 403 and 404 page responses what are 403 and 404 responses  when a user visits a web page the web server sends a response code in addition to the page content a normal nonerror response has code 200 if the page does not exist on the site the response code is 404 if the page exists but the user is not authorized to visit the page the response code is 403 the core software provides default responses for both 403 and 404 codes but if you prefer you can create your own pages for each what other errors can occur  under some situations your site can generate error messages these can be due to user errors such as entering invalid values in a form or incorrect configuration php runtime errors or software bugs some errors may result in a white screen of death  a totally blank web page response less drastic errors will generate error messages you can configure what happens when an error message is generated steps if desired create pages to use for 403 and 404 responses note the urls for these pages in the manage administrative menu navigate to configuration   system   basic site settings  in the error pages section enter the url for your 403404 pages starting after the site home page url for example if your site url is https examplecom and your 404 page is https examplecom notfound  you would enter  notfound  click save configuration  you should see a message indicating that the settings were saved in the manage administrative menu navigate to configuration   development   logging and errors  for a production site select none under error messages to display  for a site that is in development select one of the other options so that you are more aware of the errors the site is generating click save configuration  you should see a message indicating that the settings were saved  