diff --git a/Cargo.toml b/Cargo.toml
index 014f7701b..0133e25b4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -91,7 +91,6 @@ serde_derive = "1.0"
 
 [build-dependencies]
 skeptic = "0.13"
-serde_derive = "1.0"
 version_check = "0.1"
 
 [profile.release]
diff --git a/src/context.rs b/src/context.rs
index c9f770147..f792370f5 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -25,7 +25,7 @@ pub(crate) trait IoContext: 'static {
 
 #[derive(Debug)]
 pub(crate) enum Frame {
-    Message(HttpResponse),
+    Message(Box<HttpResponse>),
     Payload(Option<Binary>),
     Drain(Rc<RefCell<DrainFut>>),
 }
@@ -141,7 +141,7 @@ impl<A, S> HttpContext<A, S> where A: Actor<Context=Self> {
             Body::StreamingContext | Body::UpgradeContext => self.streaming = true,
             _ => (),
         }
-        self.stream.push_back(Frame::Message(resp))
+        self.stream.push_back(Frame::Message(Box::new(resp)))
     }
 
     /// Write payload
diff --git a/src/encoding.rs b/src/encoding.rs
index be44990b7..e4af95929 100644
--- a/src/encoding.rs
+++ b/src/encoding.rs
@@ -125,9 +125,9 @@ impl PayloadWriter for PayloadType {
 }
 
 enum Decoder {
-    Deflate(DeflateDecoder<Writer<BytesMut>>),
-    Gzip(Option<GzDecoder<Wrapper>>),
-    Br(BrotliDecoder<Writer<BytesMut>>),
+    Deflate(Box<DeflateDecoder<Writer<BytesMut>>>),
+    Gzip(Box<Option<GzDecoder<Wrapper>>>),
+    Br(Box<BrotliDecoder<Writer<BytesMut>>>),
     Identity,
 }
 
@@ -158,10 +158,10 @@ impl EncodedPayload {
     pub fn new(inner: PayloadSender, enc: ContentEncoding) -> EncodedPayload {
         let dec = match enc {
             ContentEncoding::Br => Decoder::Br(
-                BrotliDecoder::new(BytesMut::with_capacity(8192).writer())),
+                Box::new(BrotliDecoder::new(BytesMut::with_capacity(8192).writer()))),
             ContentEncoding::Deflate => Decoder::Deflate(
-                DeflateDecoder::new(BytesMut::with_capacity(8192).writer())),
-            ContentEncoding::Gzip => Decoder::Gzip(None),
+                Box::new(DeflateDecoder::new(BytesMut::with_capacity(8192).writer()))),
+            ContentEncoding::Gzip => Decoder::Gzip(Box::new(None)),
             _ => Decoder::Identity,
         };
         EncodedPayload {
@@ -204,13 +204,13 @@ impl PayloadWriter for EncodedPayload {
                 }
                 loop {
                     let len = self.dst.get_ref().len();
-                    let len_buf = decoder.as_mut().unwrap().get_mut().buf.len();
+                    let len_buf = decoder.as_mut().as_mut().unwrap().get_mut().buf.len();
 
                     if len < len_buf * 2 {
                         self.dst.get_mut().reserve(len_buf * 2 - len);
                         unsafe{self.dst.get_mut().set_len(len_buf * 2)};
                     }
-                    match decoder.as_mut().unwrap().read(&mut self.dst.get_mut()) {
+                    match decoder.as_mut().as_mut().unwrap().read(&mut self.dst.get_mut()) {
                         Ok(n) =>  {
                             if n == 0 {
                                 self.inner.feed_eof();
@@ -271,13 +271,13 @@ impl PayloadWriter for EncodedPayload {
                 if decoder.is_none() {
                     let mut buf = BytesMut::new();
                     buf.extend(data);
-                    *decoder = Some(GzDecoder::new(Wrapper{buf: buf}).unwrap());
+                    *(decoder.as_mut()) = Some(GzDecoder::new(Wrapper{buf: buf}).unwrap());
                 } else {
-                    decoder.as_mut().unwrap().get_mut().buf.extend(data);
+                    decoder.as_mut().as_mut().unwrap().get_mut().buf.extend(data);
                 }
 
                 loop {
-                    let len_buf = decoder.as_mut().unwrap().get_mut().buf.len();
+                    let len_buf = decoder.as_mut().as_mut().unwrap().get_mut().buf.len();
                     if len_buf == 0 {
                         return
                     }
@@ -287,7 +287,7 @@ impl PayloadWriter for EncodedPayload {
                         self.dst.get_mut().reserve(len_buf * 2 - len);
                         unsafe{self.dst.get_mut().set_len(len_buf * 2)};
                     }
-                    match decoder.as_mut().unwrap().read(&mut self.dst.get_mut()) {
+                    match decoder.as_mut().as_mut().unwrap().read(&mut self.dst.get_mut()) {
                         Ok(n) =>  {
                             if n == 0 {
                                 return
diff --git a/src/h1writer.rs b/src/h1writer.rs
index 58b6da58c..ec3c6c314 100644
--- a/src/h1writer.rs
+++ b/src/h1writer.rs
@@ -1,8 +1,7 @@
 use std::io;
-use std::fmt::Write;
 use futures::{Async, Poll};
 use tokio_io::AsyncWrite;
-use http::{Version, StatusCode};
+use http::Version;
 use http::header::{HeaderValue, CONNECTION, CONTENT_TYPE, DATE};
 
 use date;
@@ -151,11 +150,17 @@ impl<T: AsyncWrite> Writer for H1Writer<T> {
                 buffer.reserve(100 + msg.headers().len() * AVERAGE_HEADER_SIZE);
             }
 
-            if version == Version::HTTP_11 && msg.status() == StatusCode::OK {
-                buffer.extend(b"HTTP/1.1 200 OK\r\n");
-            } else {
-                let _ = write!(buffer, "{:?} {}\r\n", version, msg.status());
+            match version {
+                Version::HTTP_11 => buffer.extend(b"HTTP/1.1 "),
+                Version::HTTP_2 => buffer.extend(b"HTTP/2.0 "),
+                Version::HTTP_10 => buffer.extend(b"HTTP/1.0 "),
+                Version::HTTP_09 => buffer.extend(b"HTTP/0.9 "),
             }
+            buffer.extend(msg.status().as_u16().to_string().as_bytes());
+            buffer.extend(b" ");
+            buffer.extend(msg.reason().as_bytes());
+            buffer.extend(b"\r\n");
+
             for (key, value) in msg.headers() {
                 let t: &[u8] = key.as_ref();
                 buffer.extend(t);
diff --git a/src/handler.rs b/src/handler.rs
index 5c9ba94a8..f059e81c0 100644
--- a/src/handler.rs
+++ b/src/handler.rs
@@ -50,7 +50,7 @@ impl<F, R, S> Handler<S> for F
 pub struct Reply(ReplyItem);
 
 pub(crate) enum ReplyItem {
-    Message(HttpResponse),
+    Message(Box<HttpResponse>),
     Actor(Box<IoContext>),
     Future(Box<Future<Item=HttpResponse, Error=Error>>),
 }
@@ -76,7 +76,7 @@ impl Reply {
     /// Send response
     #[inline]
     pub fn response<R: Into<HttpResponse>>(response: R) -> Reply {
-        Reply(ReplyItem::Message(response.into()))
+        Reply(ReplyItem::Message(Box::new(response.into())))
     }
 
     #[inline]
@@ -107,14 +107,14 @@ impl FromRequest for HttpResponse {
     type Error = Error;
 
     fn from_request(self, _: HttpRequest) -> Result<Reply, Error> {
-        Ok(Reply(ReplyItem::Message(self)))
+        Ok(Reply(ReplyItem::Message(Box::new(self))))
     }
 }
 
 impl From<HttpResponse> for Reply {
 
     fn from(resp: HttpResponse) -> Reply {
-        Reply(ReplyItem::Message(resp))
+        Reply(ReplyItem::Message(Box::new(resp)))
     }
 }
 
@@ -138,7 +138,7 @@ impl<E: Into<Error>> From<Result<Reply, E>> for Reply {
     fn from(res: Result<Reply, E>) -> Self {
         match res {
             Ok(val) => val,
-            Err(err) => Reply(ReplyItem::Message(err.into().into())),
+            Err(err) => Reply(ReplyItem::Message(Box::new(err.into().into()))),
         }
     }
 }
diff --git a/src/httpcodes.rs b/src/httpcodes.rs
index e2af3ec50..f00a2a5f5 100644
--- a/src/httpcodes.rs
+++ b/src/httpcodes.rs
@@ -166,7 +166,7 @@ mod tests {
     #[test]
     fn test_with_reason() {
         let resp = HTTPOk.response();
-        assert_eq!(resp.reason(), "");
+        assert_eq!(resp.reason(), "OK");
 
         let resp = HTTPBadRequest.with_reason("test");
         assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
diff --git a/src/httpresponse.rs b/src/httpresponse.rs
index ba4cb7b23..3ff4089c7 100644
--- a/src/httpresponse.rs
+++ b/src/httpresponse.rs
@@ -119,7 +119,7 @@ impl HttpResponse {
         if let Some(reason) = self.reason {
             reason
         } else {
-            ""
+            self.status.canonical_reason().unwrap_or("<unknown status code>")
         }
     }
 
diff --git a/src/middlewares/defaultheaders.rs b/src/middlewares/defaultheaders.rs
index a0b772e90..3335847e0 100644
--- a/src/middlewares/defaultheaders.rs
+++ b/src/middlewares/defaultheaders.rs
@@ -37,7 +37,7 @@ impl DefaultHeaders {
 
 impl<S> Middleware<S> for DefaultHeaders {
 
-    fn response(&self, _: &mut HttpRequest<S>, mut resp: HttpResponse) -> Response {
+    fn response(&self, _: &mut HttpRequest<S>, mut resp: Box<HttpResponse>) -> Response {
         for (key, value) in self.0.iter() {
             if !resp.headers().contains_key(key) {
                 resp.headers_mut().insert(key, value.clone());
@@ -97,14 +97,14 @@ mod tests {
         let mut req = HttpRequest::default();
 
         let resp = HttpResponse::Ok().finish().unwrap();
-        let resp = match mw.response(&mut req, resp) {
+        let resp = match mw.response(&mut req, Box::new(resp)) {
             Response::Done(resp) => resp,
             _ => panic!(),
         };
         assert_eq!(resp.headers().get(CONTENT_TYPE).unwrap(), "0001");
 
         let resp = HttpResponse::Ok().header(CONTENT_TYPE, "0002").finish().unwrap();
-        let resp = match mw.response(&mut req, resp) {
+        let resp = match mw.response(&mut req, Box::new(resp)) {
             Response::Done(resp) => resp,
             _ => panic!(),
         };
diff --git a/src/middlewares/mod.rs b/src/middlewares/mod.rs
index b9798c97b..d5d88fc78 100644
--- a/src/middlewares/mod.rs
+++ b/src/middlewares/mod.rs
@@ -21,7 +21,7 @@ pub enum Started {
     Err(Error),
     /// New http response got generated. If middleware generates response
     /// handler execution halts.
-    Response(HttpResponse),
+    Response(Box<HttpResponse>),
     /// Execution completed, runs future to completion.
     Future(Box<Future<Item=Option<HttpResponse>, Error=Error>>),
 }
@@ -31,7 +31,7 @@ pub enum Response {
     /// Moddleware error
     Err(Error),
     /// New http response got generated
-    Done(HttpResponse),
+    Done(Box<HttpResponse>),
     /// Result is a future that resolves to a new http response
     Future(Box<Future<Item=HttpResponse, Error=Error>>),
 }
@@ -56,7 +56,7 @@ pub trait Middleware<S> {
 
     /// Method is called when handler returns response,
     /// but before sending http message to peer.
-    fn response(&self, req: &mut HttpRequest<S>, resp: HttpResponse) -> Response {
+    fn response(&self, req: &mut HttpRequest<S>, resp: Box<HttpResponse>) -> Response {
         Response::Done(resp)
     }
 
diff --git a/src/middlewares/session.rs b/src/middlewares/session.rs
index a807b0c03..d38fb0682 100644
--- a/src/middlewares/session.rs
+++ b/src/middlewares/session.rs
@@ -107,7 +107,7 @@ impl<S: 'static, T: SessionBackend<S>> Middleware<S> for SessionStorage<T, S> {
         Started::Future(Box::new(fut))
     }
 
-    fn response(&self, req: &mut HttpRequest<S>, resp: HttpResponse) -> Response {
+    fn response(&self, req: &mut HttpRequest<S>, resp: Box<HttpResponse>) -> Response {
         if let Some(s_box) = req.extensions().remove::<Arc<SessionImplBox>>() {
             s_box.0.write(resp)
         } else {
@@ -129,7 +129,7 @@ pub trait SessionImpl: 'static {
     fn clear(&mut self);
 
     /// Write session to storage backend.
-    fn write(&self, resp: HttpResponse) -> Response;
+    fn write(&self, resp: Box<HttpResponse>) -> Response;
 }
 
 /// Session's storage backend trait definition.
@@ -155,7 +155,7 @@ impl SessionImpl for DummySessionImpl {
     fn set(&mut self, key: &str, value: String) {}
     fn remove(&mut self, key: &str) {}
     fn clear(&mut self) {}
-    fn write(&self, resp: HttpResponse) -> Response {
+    fn write(&self, resp: Box<HttpResponse>) -> Response {
         Response::Done(resp)
     }
 }
@@ -205,7 +205,7 @@ impl SessionImpl for CookieSession {
         self.state.clear()
     }
 
-    fn write(&self, mut resp: HttpResponse) -> Response {
+    fn write(&self, mut resp: Box<HttpResponse>) -> Response {
         if self.changed {
             let _ = self.inner.set_cookie(&mut resp, &self.state);
         }
diff --git a/src/param.rs b/src/param.rs
index 63c37f13b..b948ac187 100644
--- a/src/param.rs
+++ b/src/param.rs
@@ -20,7 +20,7 @@ pub trait FromParam: Sized {
 ///
 /// If resource path contains variable patterns, `Params` stores this variables.
 #[derive(Debug)]
-pub struct Params<'a>(SmallVec<[(&'a str, &'a str); 4]>);
+pub struct Params<'a>(SmallVec<[(&'a str, &'a str); 3]>);
 
 impl<'a> Default for Params<'a> {
     fn default() -> Params<'a> {
diff --git a/src/pipeline.rs b/src/pipeline.rs
index cea38fa9e..9c7aa60d4 100644
--- a/src/pipeline.rs
+++ b/src/pipeline.rs
@@ -141,7 +141,8 @@ impl<S> Pipeline<S> {
 impl Pipeline<()> {
     pub fn error<R: Into<HttpResponse>>(err: R) -> Box<HttpHandlerTask> {
         Box::new(Pipeline(
-            PipelineInfo::new(HttpRequest::default()), ProcessResponse::init(err.into())))
+            PipelineInfo::new(
+                HttpRequest::default()), ProcessResponse::init(Box::new(err.into()))))
     }
 }
 
@@ -346,15 +347,15 @@ impl<S> StartMiddlewares<S> {
                                     fut: Some(fut)}),
                             Ok(Async::Ready(resp)) => {
                                 if let Some(resp) = resp {
-                                    return RunMiddlewares::init(info, resp);
+                                    return RunMiddlewares::init(info, Box::new(resp));
                                 }
                                 info.count += 1;
                             }
                             Err(err) =>
-                                return ProcessResponse::init(err.into()),
+                                return ProcessResponse::init(Box::new(err.into())),
                         },
                     Started::Err(err) =>
-                        return ProcessResponse::init(err.into()),
+                        return ProcessResponse::init(Box::new(err.into())),
                 }
             }
         }
@@ -369,7 +370,7 @@ impl<S> StartMiddlewares<S> {
                 Ok(Async::Ready(resp)) => {
                     info.count += 1;
                     if let Some(resp) = resp {
-                        return Ok(RunMiddlewares::init(info, resp));
+                        return Ok(RunMiddlewares::init(info, Box::new(resp)));
                     }
                     if info.count == len {
                         let reply = (unsafe{&*self.hnd})(info.req.clone());
@@ -387,13 +388,13 @@ impl<S> StartMiddlewares<S> {
                                     continue 'outer
                                 },
                                 Started::Err(err) =>
-                                    return Ok(ProcessResponse::init(err.into()))
+                                    return Ok(ProcessResponse::init(Box::new(err.into())))
                             }
                         }
                     }
                 }
                 Err(err) =>
-                    return Ok(ProcessResponse::init(err.into()))
+                    return Ok(ProcessResponse::init(Box::new(err.into())))
             }
         }
     }
@@ -441,14 +442,14 @@ impl<S> WaitingResponse<S> {
                         Ok(Async::Ready(None)) => {
                             error!("Unexpected eof");
                             let err: Error = UnexpectedTaskFrame.into();
-                            return Ok(ProcessResponse::init(err.into()))
+                            return Ok(ProcessResponse::init(Box::new(err.into())))
                         },
                         Ok(Async::NotReady) => {
                             self.stream = PipelineResponse::Context(context);
                             return Err(PipelineState::Handler(self))
                         },
                         Err(err) =>
-                            return Ok(ProcessResponse::init(err.into()))
+                            return Ok(ProcessResponse::init(Box::new(err.into())))
                     }
                 }
             },
@@ -459,9 +460,9 @@ impl<S> WaitingResponse<S> {
                         Err(PipelineState::Handler(self))
                     }
                     Ok(Async::Ready(response)) =>
-                        Ok(RunMiddlewares::init(info, response)),
+                        Ok(RunMiddlewares::init(info, Box::new(response))),
                     Err(err) =>
-                        Ok(ProcessResponse::init(err.into())),
+                        Ok(ProcessResponse::init(Box::new(err.into()))),
                 }
             }
             PipelineResponse::None => {
@@ -481,7 +482,7 @@ struct RunMiddlewares<S> {
 
 impl<S> RunMiddlewares<S> {
 
-    fn init(info: &mut PipelineInfo<S>, mut resp: HttpResponse) -> PipelineState<S>
+    fn init(info: &mut PipelineInfo<S>, mut resp: Box<HttpResponse>) -> PipelineState<S>
     {
         if info.count == 0 {
             return ProcessResponse::init(resp);
@@ -493,7 +494,7 @@ impl<S> RunMiddlewares<S> {
             resp = match info.mws[curr].response(info.req_mut(), resp) {
                 Response::Err(err) => {
                     info.count = curr + 1;
-                    return ProcessResponse::init(err.into())
+                    return ProcessResponse::init(Box::new(err.into()))
                 }
                 Response::Done(r) => {
                     curr += 1;
@@ -521,10 +522,10 @@ impl<S> RunMiddlewares<S> {
                     return Ok(PipelineState::RunMiddlewares(self)),
                 Ok(Async::Ready(resp)) => {
                     self.curr += 1;
-                    resp
+                    Box::new(resp)
                 }
                 Err(err) =>
-                    return Ok(ProcessResponse::init(err.into())),
+                    return Ok(ProcessResponse::init(Box::new(err.into()))),
             };
 
             loop {
@@ -533,7 +534,7 @@ impl<S> RunMiddlewares<S> {
                 } else {
                     match info.mws[self.curr].response(info.req_mut(), resp) {
                         Response::Err(err) =>
-                            return Ok(ProcessResponse::init(err.into())),
+                            return Ok(ProcessResponse::init(Box::new(err.into()))),
                         Response::Done(r) => {
                             self.curr += 1;
                             resp = r
@@ -550,7 +551,7 @@ impl<S> RunMiddlewares<S> {
 }
 
 struct ProcessResponse<S> {
-    resp: HttpResponse,
+    resp: Box<HttpResponse>,
     iostate: IOState,
     running: RunningState,
     drain: DrainVec,
@@ -596,6 +597,7 @@ impl IOState {
 }
 
 struct DrainVec(Vec<Rc<RefCell<DrainFut>>>);
+
 impl Drop for DrainVec {
     fn drop(&mut self) {
         for drain in &mut self.0 {
@@ -606,7 +608,7 @@ impl Drop for DrainVec {
 
 impl<S> ProcessResponse<S> {
 
-    fn init(resp: HttpResponse) -> PipelineState<S>
+    fn init(resp: Box<HttpResponse>) -> PipelineState<S>
     {
         PipelineState::Response(
             ProcessResponse{ resp: resp,
@@ -786,14 +788,14 @@ impl<S> ProcessResponse<S> {
 
 /// Middlewares start executor
 struct FinishingMiddlewares<S> {
-    resp: HttpResponse,
+    resp: Box<HttpResponse>,
     fut: Option<Box<Future<Item=(), Error=Error>>>,
     _s: PhantomData<S>,
 }
 
 impl<S> FinishingMiddlewares<S> {
 
-    fn init(info: &mut PipelineInfo<S>, resp: HttpResponse) -> PipelineState<S> {
+    fn init(info: &mut PipelineInfo<S>, resp: Box<HttpResponse>) -> PipelineState<S> {
         if info.count == 0 {
             Completed::init(info)
         } else {
diff --git a/src/server.rs b/src/server.rs
index 5d03d4f9f..3e81e5422 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -267,6 +267,7 @@ impl<H: HttpHandler, U, V> HttpServer<TcpStream, net::SocketAddr, H, U>
                             };
                             let msg = IoStream{
                                 io: socket.into_tcp_stream(), peer: Some(addr), http2: false};
+                            println!("next: {}", next);
                             wrks[next].unbounded_send(msg).expect("worker thread died");
                             next = (next + 1) % wrks.len();
                         }
diff --git a/tests/test_server.rs b/tests/test_server.rs
index b3b58b3b7..65a0a38e1 100644
--- a/tests/test_server.rs
+++ b/tests/test_server.rs
@@ -59,7 +59,7 @@ impl<S> middlewares::Middleware<S> for MiddlewareTest {
         middlewares::Started::Done
     }
 
-    fn response(&self, _: &mut HttpRequest<S>, resp: HttpResponse) -> middlewares::Response {
+    fn response(&self, _: &mut HttpRequest<S>, resp: Box<HttpResponse>) -> middlewares::Response {
         self.response.store(self.response.load(Ordering::Relaxed) + 1, Ordering::Relaxed);
         middlewares::Response::Done(resp)
     }
@@ -85,9 +85,9 @@ fn test_middlewares() {
 
         HttpServer::new(
             move || vec![Application::new()
-                         .middleware(MiddlewareTest{start: act_num1.clone(),
-                                                    response: act_num2.clone(),
-                                                    finish: act_num3.clone()})
+                         .middleware(MiddlewareTest{start: Arc::clone(&act_num1),
+                                                    response: Arc::clone(&act_num2),
+                                                    finish: Arc::clone(&act_num3)})
                          .resource("/", |r| r.method(Method::GET).h(httpcodes::HTTPOk))])
             .serve::<_, ()>("127.0.0.1:58904").unwrap();
         sys.run();