how to get value from Span?

[baoyachi]

Span record id, how to get request_id from Current Span ?

• E.g:

async fn send_data() {
+   let span = info_span!("request_id","89c11720-8410-4b41-9ffe-64c8246b13da");
    http_get("url").await;
}

async fn http_get(url:&str) {
+     // how to get request_id from Current Span ?

        Request::get(url)
        .header("content-type", "application/json")
+        .header("request_id", request_id)
        .timeout(Duration::from_secs(30))
        .body(())?
        .send_async()
        .await?;

}