# prepare for letsencrypt
    # https://community.centminmod.com/posts/17774/
    location ~ /.well-known {
        location ~ /.well-known/acme-challenge/(.*) {
                more_set_headers    "Content-Type: text/plain";
        }
    }

    location ~* \.(3gp|gif|jpg|jpeg|png|ico|wmv|avi|asf|asx|mpg|mpeg|mp4|pls|mp3|mid|wav|swf|flv|exe|zip|tar|rar|gz|tgz|bz2|uha|7z|doc|docx|xls|xlsx|pdf|iso)$ {
        gzip_static off;
        #add_header Pragma public;
        add_header Cache-Control "public, must-revalidate, proxy-revalidate";
        access_log off;
        expires 30d;
        break;
        }

    location ~* \.(js)$ {
        #add_header Pragma public;
        add_header Cache-Control "public, must-revalidate, proxy-revalidate";
        access_log off;
        expires 30d;
        break;
        }

    location ~* \.(css)$ {
        #add_header Pragma public;
        add_header Cache-Control "public, must-revalidate, proxy-revalidate";
        access_log off;
        expires 30d;
        break;
        }

    location ~* \.(html|htm|txt)$ {
        #add_header Pragma public;
        add_header Cache-Control "public, must-revalidate, proxy-revalidate";
        access_log off;
        expires 1d;
        break;
        }