521

Web Server Is Down

Unofficial (Cloudflare)
The origin server has rejected connections from Cloudflare

Specification of the HTTP status code 521

work in progress

How to throw a 521 statuscode with PHP?

To throw the HTTP status code 521 on a web page, the PHP function http_response_code can be used. The syntax is as follows: http_response_code(521) (PHP 5 >= 5.4.0, PHP 7, PHP 8)

Test the 521 HTTP status code

In order to be able to display the HTTP status code (in this case 521 Web Server Is Down) and other information on the client side, the development console must be opened with F12. Afterwards you have to navigate to the tab "Network". Now you can open the page, in the network tab you should see the web page (example index.php). This must be selected and then the Herder section must be selected. Here the user will see the following result:

Status code 521 Web Server Is Down
Overview
URL: https://http-statuscode.com/errorCodeExample.php?code=521
Status: 521 Web Server Is Down
Those: Network
IP address: XX.XX.XX.XX
Status code 521 Web Server Is Down

Browser compatibility of the 521 status code

Chrome no data
Edge no data
Firefox no data
Opera no data
Safari no data
Chrome Android no data
Firefox for Android no data
Opera Android no data
Safari on iOS no data
Internet no data
WebView Android no data