wp-admin blocking causing http error on uploads

Works on my side. Try disabling your plugins and test again.

Btw. You could use admin_init instead of the init action hook. This way, the snippet will only be executed on admin requests. This way, you can remove the is_admin() check in the function.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)