server {
    listen 8080;
    root /var/www/echoIP;

    error_page 403 404 500 501 502 503 504 = /error.html;

    set_real_ip_from 0.0.0.0/0;
    real_ip_header X-Real-IP;

    location = /ua {
        if ($http_user_agent ~* (curl|wget)) {
            return 200 $http_user_agent\n;
        }
        default_type application/json;
        return 200 "{\"ua\":\"$http_user_agent\"}";
    }

    location = / {
        set $query_param ?justip=true&cli=true;
        if ($http_user_agent ~* (curl|wget)) {
            proxy_pass http://127.0.0.1:8080/query$query_param;
        }
        index index.html;
    }

    location = /ip {
        set $query_param ?justip=true;
        if ($http_user_agent ~* (curl|wget)) {
            set $query_param $query_param&cli=true;
        }
        proxy_pass http://127.0.0.1:8080/query$query_param;
    }

    location = /version {
        set $query_param ?version=true;
        if ($http_user_agent ~* (curl|wget)) {
            set $query_param $query_param&cli=true;
        }
        proxy_pass http://127.0.0.1:8080/query$query_param;
    }

    location ~* ^/([^/]+?)$ {
        set $request_ip $1;
        if ($http_user_agent ~* (curl|wget)) {
            proxy_pass http://127.0.0.1:8080/info/$request_ip;
        }
    }

    location ^~ /info {
        set $is_legal 0;
        set $query_param ?cli=false;
        if ($http_user_agent ~* (curl|wget)) {
            set $query_param ?cli=true;
        }
        if ($uri ~* ^/info/?$) {
            set $is_legal 1;
        }
        if ($uri ~* ^/info/([^/]+?)$) {
            set $is_legal 1;
            set $query_param $query_param&ip=$1;
        }
        if ($is_legal = 0) {
            set $query_param $query_param&error=true;
        }
        proxy_pass http://127.0.0.1:8080/query$query_param;
    }

    location = /query {
        include fastcgi_params;
        fastcgi_pass unix:/var/run/php/php7.3-fpm.sock;
        fastcgi_param SCRIPT_FILENAME /var/www/echoIP/backend/queryInfo.php;
    }
}