Cloudflare return 404 when Setting the Security Level of a Configuration Rule to HIGH

Website, Application, Performance Security
1

Hi, I have setup a configuration rule that will set the Security Level to HIGH for user agent containing “Firefox/6”. I get a blank page on Firefox browser when visit my website with user agent “Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/89.0”. It obviously hits the rule. But I expect that it should show Cloudflare’s challenge page.

I use the following command to check HTTP status and it returns 404:
$ curl -ISs -A "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/89.0" https://www.domainxxxx.com/

It’s a bug of Cloudflare?

5

Sorry for my typo mistakes. Here is the correct command I used:
$ curl -ISs -A "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/69.0" https://www.domainxxxx.com/

6

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