location / {
                proxy_pass      http://10.0.0.34:8080;
        }

        location /externals {
                alias   /var/www/me2di/externals;
        }

        location /public {
                alias   /var/www/me2di/public;
        }

        location /temporary {
                alias   /var/www/me2di/temporary;
        }

=====>

        location / {
                proxy_pass      http://10.0.0.34:8080;
        }

        location /(externals|public|temporary) {
                root   /var/www/me2di;
        }