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Isn't cloudflare blocking this spam? Because I was managing a WordPress site for a client behind cloudflare and they were still able to spam usi g this technique

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No, the referal spam never hits the website. It instead goes straight to GA.

hbcondo714 is correct, nothing every actually touches your website. Its send with the measurement protocol, which allows you to POST data straight to GA.

https://developers.google.com/analytics/devguides/collection...

This is the detail that the article seemed to miss. Or did I miss it?

Cloudflare does block some spammers, and marks them as "bad browser." But it doesn't catch all types of spam attacks.

https://support.cloudflare.com/hc/en-us/articles/200170086-W...

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