Free hosting providers have at least one disadvantage,
their uptime not always being what you want it to be.
So what is better than a free hosting provider? Two free hosting providers!
Install a mirror image of your website at a second hosting provider and use this as a failover.
When your website at your current provider goes down, you simply switch your public DNS records to the failover provider.
The challenge now is, how to know the failover is up before switching DNS records?
As your public DNS records are currently not pointing to the failover, you cannot check your website at the failover provider. It might be down also, due to maintenance or your account might be blocked or removed.
Custom Sensor HTTPFailoverSite checks your website at the failover provider, without your DNS records actually pointing there.
In the image below, sensor 1 checks the domain website using the public DNS records.
Sensors 2 and 3 are checking the domain website as if the public DNS records were actually pointing to the providers in case.
FAILOVERSITE
This also provides a nice insight in uptime and response of different providers, as if they were live hosting your website.