Add dummy inner spans with no parent

src/lib.rs

@@ -142,7 +142,9 @@ where
         }
 
         TracingFuture {
-            future: span.in_scope(|| self.0.call(req)),
+            future: span
+                .in_scope(|| self.0.call(req))
+                .instrument(tracing::trace_span!(parent: None, "Http Request Inner")),
         }
         .instrument(span)
     }
@@ -151,7 +153,7 @@ where
 pin_project_lite::pin_project! {
     pub struct TracingFuture<F> {
         #[pin]
-        future: F,
+        future: Instrumented<F>,
     }
 }
 
@@ -217,6 +219,7 @@ where
 pin_project_lite::pin_project! {
     struct InstrumentedBody<S> {
         span: Option<Span>,
+        dummy_span: Option<Span>,
 
         #[pin]
         body: S,
@@ -228,7 +231,11 @@ where
     S: Stream<Item = Result<Bytes, PayloadError>>,
 {
     fn new(body: S) -> InstrumentedBody<S> {
-        InstrumentedBody { span: None, body }
+        InstrumentedBody {
+            span: None,
+            dummy_span: None,
+            body,
+        }
     }
 }
 
@@ -244,9 +251,14 @@ where
         let span = this
             .span
             .get_or_insert_with(|| tracing::info_span!("HTTP Client Response Body"));
+
+        let dummy_span = this.dummy_span.get_or_insert_with(|| {
+            tracing::trace_span!(parent: None, "HTTP Client Response Body Inner")
+        });
+
         let body = this.body;
 
-        span.in_scope(|| body.poll_next(cx))
+        span.in_scope(|| dummy_span.in_scope(|| body.poll_next(cx)))
     }
 }