nzipkin/b3-propagation>propagate the B3 trace headers</a>, as well as the Envoy-generated request ID. These headers include:</p><ul><li><code>x-request-id</code></li><li><code>x-b3-traceid</code></li><li><code>x-b3-spanid</code></li><li><code>x-b3-parentspanid</code></li><li><code>x-b3-sampled</code></li><li><code>x-b3-flags</code></li><li><code>b3</code></li></ul><p>If you are using Lightstep, you will also need to forward the following headers:</p><ul><li><code>x-ot-span-context</code></li></ul><p>If you 