https://blog.plzhans.com/en/categories/develop/Recent content in Develop on plzhans blogHugoenWed, 16 Sep 2026 14:55:00 +0000https://blog.plzhans.com/en/posts/129-sentry-trace-headers-trace-propagation-targets/Wed, 16 Sep 2026 14:55:00 +0000https://blog.plzhans.com/en/posts/129-sentry-trace-headers-trace-propagation-targets/<p><a href="https://blog.plzhans.com/posts/129-sentry-trace-headers-trace-propagation-targets/assets/1_3dd22a0f-7e83-81f2-a997-f8cc7e65a827.jpg" data-pswp-width="1376" data-pswp-height="768" target="_blank" rel="noopener" aria-label="Sentry stepping into the middle of an app&rsquo;s outgoing HTTP request to an external API and injecting the baggage header"> <picture> <source srcset="https://blog.plzhans.com/posts/129-sentry-trace-headers-trace-propagation-targets/assets/1_3dd22a0f-7e83-81f2-a997-f8cc7e65a827_hu_96dbd97b24bd7f9.webp" type="image/webp"> <img src="https://blog.plzhans.com/posts/129-sentry-trace-headers-trace-propagation-targets/assets/1_3dd22a0f-7e83-81f2-a997-f8cc7e65a827_hu_6ea779b396b4ca93.jpg" alt="Sentry stepping into the middle of an app&rsquo;s outgoing HTTP request to an external API and injecting the baggage header" width="1200" height="670" loading="eager" fetchpriority="high"> </picture> </a></p> <h2 id="overview">Overview</h2> <p>Turning Sentry on doesn&rsquo;t just bring error collection with it. Distributed tracing comes on as well, and from that point every outgoing request carries trace headers.</p> <p>There is no such line in your app code. Nothing shows up in the logs either. So when something goes wrong, no amount of reading the code will reveal it.</p>