---
module: [kind=event] http_check
see: http.checkURLAsync To check a URL asynchronously.
---

The @{http_check} event is fired when a URL check finishes.

This event is normally handled inside @{http.checkURL}, but it can still be seen when using @{http.checkURLAsync}.

## Return Values
1. @{string}: The event name.
2. @{string}: The URL requested to be checked.
3. @{boolean}: Whether the check succeeded.
4. @{string|nil}: If the check failed, a reason explaining why the check failed.