GitHub

Fatal error: Uncaught Error: Undefined class constant 'RETRY_HEADER_KEY'

We are using Wordpress + SiteHealth plugin and got an error in one of SiteHealth checks Fatal error: Uncaught Error: Undefined ...
GitHub

Breaking bug: Fatal error: Uncaught Error: Undefined constant "HEADER"

If you happen to get blank screen, and after turning on debug option you will get this error: Fatal error: Uncaught Error ...