build: echo request id response header

server-rs/apps/api-server/src/response_headers.rs

@@ -0,0 +1,23 @@
+use axum::{
+    extract::Request,
+    http::{header::HeaderName, HeaderValue},
+    middleware::Next,
+    response::Response,
+};
+
+use crate::request_context::{resolve_request_id, X_REQUEST_ID_HEADER};
+
+pub async fn propagate_request_id_header(request: Request, next: Next) -> Response {
+    let request_id = resolve_request_id(&request);
+    let mut response = next.run(request).await;
+
+    if let Some(request_id) = request_id {
+        if let Ok(header_value) = HeaderValue::from_str(&request_id) {
+            response
+                .headers_mut()
+                .insert(HeaderName::from_static(X_REQUEST_ID_HEADER), header_value);
+        }
+    }
+
+    response
+}