This error often occurs when there are bugs in the website or when some specific preconditions set by the server are not met by the client-side.
Here’s how you can attempt to solve the 412 Precondition Failed in Apache:
1. Cache: In many instances, these types of errors might be due to browser cache. Clear your browser cache and cookies and see whether the issue still persists.
1. Refresh: Try reloading the page. The simplest way to do that is by pressing F5 or clicking the reload icon near the address bar.
1. Internet Connection: Address any connectivity issues. A poor connection can cause errors. You may want to disconnect and then reconnect to your WiFi or hardwired ethernet connection.
1. Using HTTP Instead of HTTPS: If your website is not fully secured by an SSL Certificate, then consider using the unsecured HTTP protocol instead of HTTPS. Replace “https” with “http” at the beginning of your URL and try accessing the site again.
1. URL Inspection: Make sure the URL doesn’t contain any typos or errors. Double-check the URL and ensure it is correctly spelled and formatted.
1. Code: If you’re the developer of the site, check the code on your backend server. Are there areas where you’re indicating to the client they should send headers that they may not be sending or even able to send?
1. Check Server Logs and Configuration Files: This might help you pinpoint the source of the error. Mainly, you should verify that your request meets all the conditions put forward by the server.
1. Disabled Plugins: If appropriate, disable any new plugins or updates that have been recently installed in case these are causing the error.
1. Contact Support: If you’re not the website administrator or owner and none of the above solutions work, you should contact the website’s technical support for further help.
If you’re the website admin, you should ensure that all preconditions set in the HTTP headers are achievable for visitors, or contact a programmer or developer if needed.
