CF return 400 response code

Dear support, on all my PUT request I accepted 400 response code from CF. Requests do not go any further to my server.


We would need more information to help you. What’s the URL or do you have a screenshot of the error?

Typically, a 4XX error is an issue with the client.

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Hi @Wanda @simon.samuel

I experience the same problem with my app which ran many months without problems. In the recent days or something Cloudflare started to reject my http requests with 400 bad request without any further message. The requests are not logged in CF Analytics so I guess it’s not a WAF Problem (I already disabled WAF, etc. - didn’t work).

@Wanda Could you check please, it’s urgent.

<head><title>400 Bad Request</title></head>
<center><h1>400 Bad Request</h1></center>

400 response appears only when body data (json) is set, otherwise the requets goes through.

curl -X POST -H ‘Content-type: application/json’ --data ‘{“text”:“Hello, World!”}’ myhost…

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