For HTTP monitors, Uptime Robot considers them as up or down according to the HTTP statuses returned (or if “no response returns at all”).
If the HTTP status returned is:
- between 200 and 399, it is considered as “up”
- bigger than 399, is considered as “down”
- with an exception:
- equals 401 and no authentication info is defined, it is considered as up
- equals 401 and authentication info is defined, it is considered as down
It is now possible to customize which HTTP statuses are considered as up or down.
This is pretty handy if you plan to monitor a web page which returns HTTP 404 and want it to be detected as “up”, prefer to ignore several erroneous HTTP statuses and more.
The feature is available in the Pro Plan and can be reached from the “Add/Edit Monitor dialogs of HTTP monitors>Advanced Settings>Custom HTTP Statuses tab”.