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set $origin '*';
    if ($http_origin) {
        set $origin "$http_origin";
    }

    add_header Access-Control-Allow-Origin "$origin";
    add_header Access-Control-Allow-Credentials "true";
    add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
    add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,
    If-Modified-Since,Cache-Control,Content-Type,Authorization,Authori-zation';
    
    if ($request_method = 'OPTIONS') {
        return 204;
    }

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Response to preflight request doesn't pass access control check: The value o