Error:HTTP/2 Stream closed with error code NGHTTP2_CANCEL

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programming

so since yesterday/today i cannot login on one of my vps's services, and i've got this in my browser on trying to login. i've tried postman and this is the error response (see title) there, in the browser it is: net::ERR_HTTP2_PROTOCOL_ERROR. The method is posting a json object. base stack: latest Debian apache2 php-fpm8.4