Frequent 400 error


For several weeks, I have had more and more 400 errors on CURL requests from a server, whereas when I do it from my own browser or with POSTMAN, it works!

I tried the CURL_POSTFIELDS but without success. I really feel like it comes from CLOUDFLARE blocking these incoming requests.

Best regards,

You should get the Ray ID from the failed request and view your WAF event log to see what is blocking the requests

Thank you for your answer !

In Security > Event, I have no line.
Do we have to have the Business subscription to have access to the full logs?

We found that it comes from the serialize() function (PHP) which seems to be blocked by Cloudflare.
If we stop to use this function, it works.

It should be at

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