waf – Can a firewall appliance block http requests?

Yes. A firewall appliance (or a firewall application) will be able to distinguish between HTTP and HTTPS requests and, in the case of HTTP requests, will be able to view all the data being transmitted (not just the domain and IP). It can then block or modify any data going through.

You can also do this with HTTPS requests if you have a firewall that supports TLS interception, but then you’ll need to install the firewall appliance’s root certificate into your browser for it to trust it.