nginx simple apikey

default.conf

server {
    listen       80;
    server_name  localhost;
    location / {
        default_type application/json;

        if ($http_x_api_key = "") {
            return 403 '{"error": "missing api key"}';
        }

        if ($http_x_api_key != "testkey") {
            return 403 '{"error": "invalid api key"}';
        }
        
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }
}