diff --git a/src/proto/connection.rs b/src/proto/connection.rs
index 1fb11ac..1d119fe 100644
--- a/src/proto/connection.rs
+++ b/src/proto/connection.rs
@@ -103,6 +103,8 @@ impl<T, P, B> Connection<T, P, B>
                 }
             };
 
+            debug!("recv; frame={:?}", frame);
+
             match frame {
                 Some(Headers(frame)) => {
                     trace!("recv HEADERS; frame={:?}", frame);
diff --git a/src/proto/framed_read.rs b/src/proto/framed_read.rs
index 4151066..4c31d0e 100644
--- a/src/proto/framed_read.rs
+++ b/src/proto/framed_read.rs
@@ -49,7 +49,6 @@ impl<T> FramedRead<T> {
         }
 
         let kind = head.kind();
-        debug!("decoded; kind={:?}", kind);
 
         let frame = match kind {
             Kind::Settings => {
@@ -106,7 +105,6 @@ impl<T> FramedRead<T> {
                 unimplemented!()
             }
         };
-        debug!("decoded; frame={:?}", frame);
 
         Ok(Some(frame))
     }
@@ -128,7 +126,6 @@ impl<T> futures::Stream for FramedRead<T>
 
             trace!("poll; bytes={}B", bytes.len());
             if let Some(frame) = try!(self.decode_frame(bytes)) {
-                debug!("poll; frame={:?}", frame);
                 return Ok(Async::Ready(Some(frame)));
             }
         }
diff --git a/src/proto/framed_write.rs b/src/proto/framed_write.rs
index 1ce765c..4dbedbe 100644
--- a/src/proto/framed_write.rs
+++ b/src/proto/framed_write.rs
@@ -104,7 +104,7 @@ impl<T, B> Sink for FramedWrite<T, B>
             return Ok(AsyncSink::NotReady(item));
         }
 
-        trace!("send; frame={:?}", item);
+        debug!("send; frame={:?}", item);
 
         match item {
             Frame::Data(mut v) => {
diff --git a/src/proto/streams/prioritize.rs b/src/proto/streams/prioritize.rs
index cf836b3..6777eff 100644
--- a/src/proto/streams/prioritize.rs
+++ b/src/proto/streams/prioritize.rs
@@ -16,6 +16,10 @@ pub(super) struct Prioritize<B> {
 
     /// Holds frames that are waiting to be written to the socket
     buffer: Buffer<B>,
+
+    /// Holds the connection task. This signals the connection that there is
+    /// data to flush.
+    conn_task: Option<task::Task>,
 }
 
 impl<B> Prioritize<B>
@@ -28,6 +32,7 @@ impl<B> Prioritize<B>
             flow_control: FlowControl::new(config.init_local_window_sz),
             buffered_data: 0,
             buffer: Buffer::new(),
+            conn_task: None,
         }
     }
 
@@ -71,6 +76,10 @@ impl<B> Prioritize<B>
 
         // Queue the stream
         push_sender(&mut self.pending_send, stream);
+
+        if let Some(ref task) = self.conn_task {
+            task.notify();
+        }
     }
 
     pub fn poll_complete<T>(&mut self,
@@ -79,12 +88,16 @@ impl<B> Prioritize<B>
         -> Poll<(), ConnectionError>
         where T: AsyncWrite,
     {
+        self.conn_task = Some(task::current());
+
+        trace!("poll_complete");
         loop {
             // Ensure codec is ready
             try_ready!(dst.poll_ready());
 
             match self.pop_frame(store) {
                 Some(frame) => {
+                    trace!("writing frame={:?}", frame);
                     // Subtract the data size
                     self.buffered_data -= frame.flow_len();
 
diff --git a/src/proto/streams/send.rs b/src/proto/streams/send.rs
index 32d6fd9..0b2edd0 100644
--- a/src/proto/streams/send.rs
+++ b/src/proto/streams/send.rs
@@ -79,6 +79,7 @@ impl<B> Send<B> where B: Buf {
                         stream: &mut store::Ptr<B>)
         -> Result<(), ConnectionError>
     {
+        trace!("send_headers; frame={:?}", frame);
         // Update the state
         stream.state.send_open(self.init_window_sz, frame.is_end_stream())?;
 
@@ -252,6 +253,26 @@ impl<B> Send<B> where B: Buf {
         Ok(())
     }
 
+    pub fn window_size(&mut self, stream: &mut Stream<B>) -> usize {
+        if let Some(flow) = stream.state.send_flow_control() {
+            // Track the current task
+            stream.send_task = Some(task::current());
+
+            // We are observing the window, so apply the pending updates
+            flow.apply_window_update();
+
+            let mut window = flow.effective_window_size();
+
+            if stream.unadvertised_send_window > window {
+                return 0;
+            }
+
+            return (window - stream.unadvertised_send_window) as usize;
+        }
+
+        0
+    }
+
     pub fn dec_num_streams(&mut self) {
         self.num_streams -= 1;
     }
diff --git a/src/proto/streams/streams.rs b/src/proto/streams/streams.rs
index e203279..bfa6fa0 100644
--- a/src/proto/streams/streams.rs
+++ b/src/proto/streams/streams.rs
@@ -190,40 +190,6 @@ impl<B> Streams<B>
         me.actions.recv.recv_push_promise::<P>(frame, &mut stream)
     }
 
-    pub fn send_headers(&mut self, headers: frame::Headers)
-        -> Result<(), ConnectionError>
-    {
-        unimplemented!();
-        /*
-        let id = frame.stream_id();
-        let mut me = self.inner.lock().unwrap();
-        let me = &mut *me;
-
-        // let (id, state) = me.actions.send.open());
-
-
-        let state = match me.store.entry(id) {
-            Entry::Occupied(e) => e.into_mut(),
-            Entry::Vacant(e) => {
-                let (id, state) = try!(me.actions.send.open());
-                e.insert(state)
-            }
-        };
-
-        if frame.is_trailers() {
-            try!(me.actions.send.send_eos(state));
-        } else {
-            try!(me.actions.send.send_headers(state, frame.is_end_stream()));
-        }
-
-        if state.is_closed() {
-            me.actions.dec_num_streams(id);
-        }
-
-        Ok(())
-        */
-    }
-
     pub fn next_incoming(&mut self) -> Option<StreamRef<B>> {
         let key = {
             let mut me = self.inner.lock().unwrap();
@@ -399,6 +365,15 @@ impl<B> StreamRef<B>
 
         Ok(chunk.into())
     }
+
+    /// Returns the current window size
+    pub fn window_size(&mut self) -> usize {
+        let mut me = self.inner.lock().unwrap();
+        let me = &mut *me;
+
+        let mut stream = me.store.resolve(self.key);
+        me.actions.send.window_size(&mut stream)
+    }
 }
 
 impl<B> Clone for StreamRef<B> {
diff --git a/src/server.rs b/src/server.rs
index f249c96..1fee874 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -26,6 +26,16 @@ pub struct Stream<B: IntoBuf> {
     inner: proto::StreamRef<B::Buf>,
 }
 
+#[derive(Debug)]
+pub struct Send<T> {
+    src: T,
+    dst: Option<Stream<Bytes>>,
+    // Pending data
+    buf: Option<Bytes>,
+    // True when this is the end of the stream
+    eos: bool,
+}
+
 /// Flush a Sink
 struct Flush<T> {
     inner: Option<T>,
@@ -87,6 +97,7 @@ impl<T, B> Server<T, B>
         Handshake { inner: Box::new(handshake) }
     }
 
+    /// Returns `Ready` when the underlying connection has closed.
     pub fn poll_close(&mut self) -> Poll<(), ConnectionError> {
         self.connection.poll()
     }
@@ -141,13 +152,21 @@ impl<T, B> fmt::Debug for Server<T, B>
 // ===== impl Stream =====
 
 impl<B: IntoBuf> Stream<B> {
+    /// Returns the current window size.
+    ///
+    /// This function also registers interest changes. The current task will be
+    /// notified when the window size is *increased*.
+    pub fn window_size(&mut self) -> usize {
+        self.inner.window_size()
+    }
+
     pub fn send_response(&mut self, response: Response<()>, end_of_stream: bool)
         -> Result<(), ConnectionError>
     {
         self.inner.send_response(response, end_of_stream)
     }
 
-    /// Send data
+    /// Send a single data frame
     pub fn send_data(&mut self, data: B, end_of_stream: bool)
         -> Result<(), ConnectionError>
     {
@@ -162,6 +181,67 @@ impl<B: IntoBuf> Stream<B> {
     }
 }
 
+impl Stream<Bytes> {
+    /// Send the body
+    pub fn send<T>(self, src: T, end_of_stream: bool,) -> Send<T>
+        where T: futures::Stream<Item = Bytes, Error = ConnectionError>,
+    {
+        Send {
+            src: src,
+            dst: Some(self),
+            buf: None,
+            eos: end_of_stream,
+        }
+    }
+}
+
+// ===== impl Send =====
+
+impl<T> Future for Send<T>
+    where T: futures::Stream<Item = Bytes, Error = ConnectionError>,
+{
+    type Item = Stream<Bytes>;
+    type Error = ConnectionError;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        use futures::Stream;
+
+        loop {
+            if self.buf.is_none() {
+                self.buf = try_ready!(self.src.poll());
+            }
+
+            match self.buf.take() {
+                Some(mut buf) => {
+                    let cap = self.dst.as_mut().unwrap().window_size();
+
+                    if cap == 0 {
+                        self.buf = Some(buf);
+                        return Ok(Async::NotReady);
+                    } if cap >= buf.len() {
+                        self.dst.as_mut().unwrap().send_data(buf, false)?;
+                    } else {
+                        let chunk = buf.split_to(cap);
+                        self.buf = Some(buf);
+                        self.dst.as_mut().unwrap().send_data(chunk, false)?;
+
+                        return Ok(Async::NotReady);
+                    }
+                }
+                None => {
+                    // TODO: It would be nice to not have to send an extra
+                    // frame...
+                    if self.eos {
+                        self.dst.as_mut().unwrap().send_data(Bytes::new(), true)?;
+                    }
+
+                    return Ok(Async::Ready(self.dst.take().unwrap()));
+                }
+            }
+        }
+    }
+}
+
 // ===== impl Flush =====
 
 impl<T> Flush<T> {