Go to https://htmx.org/reference/#events https://htmx.org/reference/#events and find in page 'error'. You will see all the different error events that htmx lets

Go to https://htmx.org/reference/#events https://htmx.org/reference/#events and find in page 'error'. You will see all the different error events that htmx lets you hook into and handle. Don't be fooled by its apparent simplicity. It's very carefully designed.