 they are not provided by the request.</p></div></div><div class="faq-block faq-block--collapsed" id=istio-copy-headers><div class=faq-block-question><span class=faq-block-question__text>Why can't Istio propagate headers instead of the application?</span><div class=faq-block-question__icon><svg class="icon dropdown-arrow"><use xlink:href="/v1.16/img/icons.svg#dropdown-arrow"/></svg></div></div><div class=faq-block-answer><p>Although an Istio sidecar will process both inbound and outbound requests for an ass