Many load balancers and reverse proxies (e.g. Cloudflare) use browser integrity checks, which do not allow regular user agents through. This masks the request as coming from a browser.
To me it doesn't really make sense to have the tracker lie about what it is here. If you're running a load balancer, you should configure it to have a policy you actually want.
Many load balancers and reverse proxies (e.g. Cloudflare) use browser integrity checks, which do not allow regular user agents through. This masks the request as coming from a browser.