y HTTP/1.0 service</h2><p>Envoy requires HTTP/1.1 or HTTP/2 traffic for upstream services. For example, when using <a href="https://www.nginx.com/">NGINX</a> for serving traffic behind Envoy, you will need to set the <a href="http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_http_version">proxy_http_version</a> directive in your NGINX config to be “1.1”, since the NGINX default is 1.0</p><p>Example config:</p><pre><code>upstream http_backend {
    server 127.0.0.1:8080;

    keepalive 16;
}