diff --git a/src/h1.rs b/src/h1.rs
index f2189e00..5d478f01 100644
--- a/src/h1.rs
+++ b/src/h1.rs
@@ -252,7 +252,7 @@ impl<T, A, H> Http1<T, A, H>
             // check for parse error
             if self.tasks.is_empty() {
                 if self.h2 {
-                    return Ok(Async::Ready(Http1Result::Upgrade))
+                    return Ok(Async::Ready(Http1Result::Switch))
                 }
                 if self.error || self.keepalive_timer.is_none() {
                     return Ok(Async::Ready(Http1Result::Done))
diff --git a/src/task.rs b/src/task.rs
index 0a8a4606..74c2c415 100644
--- a/src/task.rs
+++ b/src/task.rs
@@ -190,12 +190,13 @@ impl Task {
                 }
             }
 
-            // use exiting frames
+            // if task is paused, write buffer probably is full
             if self.state != TaskRunningState::Paused {
+                // process exiting frames
                 while let Some(frame) = self.frames.pop_front() {
                     trace!("IO Frame: {:?}", frame);
                     let res = match frame {
-                        Frame::Message(mut response) => {
+                        Frame::Message(response) => {
                             trace!("Prepare message status={:?}", response.status);
 
                             // run middlewares