Error 520: unknown error with laravel 5.4 login

An attempt is made to make a post request on the page from login and return error 520 after login. And i 'm disabled EncryptCookies and attemp but not work.

Can you confirm if you have reviewed and tried the tips in this Help article?

https://support.cloudflare.com/hc/en-us/articles/200171936-Error-520-Web-server-is-returning-an-unknown-error

Yes, I had already checked.
I have already found the error, with a cookie too large, I have minimized it and I have made it work. Thank you.

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