1 files changed, 13 insertions, 0 deletions
diff --git a/tvix/tracing/src/propagate/reqwest.rs b/tvix/tracing/src/propagate/reqwest.rs
new file mode 100644
index 000000000000..e2afb3e948c7
--- /dev/null
+++ b/tvix/tracing/src/propagate/reqwest.rs
@@ -0,0 +1,13 @@
+use reqwest_tracing::{SpanBackendWithUrl, TracingMiddleware};
+
+/// Returns a new tracing middleware which can be used with reqwest_middleware.
+/// It will then write the `traceparent` in the header on the request and additionally records the
+/// `url` into `http.url`.
+///
+/// If otlp feature is disabled, this will not insert a `traceparent` into the header. It will
+/// basically function as a noop.
+///
+/// `traceparent` => https://www.w3.org/TR/trace-context/#trace-context-http-headers-format
+pub fn tracing_middleware() -> TracingMiddleware<SpanBackendWithUrl> {
+    TracingMiddleware::<SpanBackendWithUrl>::new()
+}