I got ERR_TOO_MANY_REDIRECTS on subdomain

I solved this error. The problem is I’ve used a mix of upper and lower case characters in my WordPress General setting URLs. To fix this condition, I must use lowercase URLs in my WordPress General setting URLs.
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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)