diff --git a/src/pipeline.rs b/src/pipeline.rs
index 85aa744ce..fbaf7399e 100644
--- a/src/pipeline.rs
+++ b/src/pipeline.rs
@@ -480,7 +480,7 @@ impl<S: 'static, H> ProcessResponse<S, H> {
                             },
                             Ok(Async::Ready(Some(chunk))) => {
                                 self.iostate = IOState::Payload(body);
-                                match io.write(chunk.as_ref()) {
+                                match io.write(chunk.into()) {
                                     Err(err) => {
                                         info.error = Some(err.into());
                                         return Ok(FinishingMiddlewares::init(info, self.resp))
@@ -522,7 +522,7 @@ impl<S: 'static, H> ProcessResponse<S, H> {
                                             break 'outter
                                         },
                                         Frame::Chunk(Some(chunk)) => {
-                                            match io.write(chunk.as_ref()) {
+                                            match io.write(chunk) {
                                                 Err(err) => {
                                                     info.error = Some(err.into());
                                                     return Ok(
diff --git a/src/server/h1writer.rs b/src/server/h1writer.rs
index 2a2601c5d..0befa9ad3 100644
--- a/src/server/h1writer.rs
+++ b/src/server/h1writer.rs
@@ -6,7 +6,7 @@ use http::Version;
 use http::header::{HeaderValue, CONNECTION, DATE};
 
 use helpers;
-use body::Body;
+use body::{Body, Binary};
 use helpers::SharedBytes;
 use httprequest::HttpMessage;
 use httpresponse::HttpResponse;
@@ -63,7 +63,7 @@ impl<T: AsyncWrite> H1Writer<T> {
         self.flags.contains(Flags::KEEPALIVE) && !self.flags.contains(Flags::UPGRADE)
     }
 
-    fn write_to_stream(&mut self) -> Result<WriterState, io::Error> {
+    fn write_to_stream(&mut self) -> io::Result<WriterState> {
         let buffer = self.encoder.get_mut();
 
         while !buffer.is_empty() {
@@ -106,9 +106,7 @@ impl<T: AsyncWrite> Writer for H1Writer<T> {
         }
     }
 
-    fn start(&mut self, req: &mut HttpMessage, msg: &mut HttpResponse)
-             -> Result<WriterState, io::Error>
-    {
+    fn start(&mut self, req: &mut HttpMessage, msg: &mut HttpResponse) -> io::Result<WriterState> {
         // prepare task
         self.flags.insert(Flags::STARTED);
         self.encoder = PayloadEncoder::new(self.buffer.clone(), req, msg);
@@ -183,16 +181,16 @@ impl<T: AsyncWrite> Writer for H1Writer<T> {
         Ok(WriterState::Done)
     }
 
-    fn write(&mut self, payload: &[u8]) -> Result<WriterState, io::Error> {
+    fn write(&mut self, payload: Binary) -> io::Result<WriterState> {
         self.written += payload.len() as u64;
         if !self.flags.contains(Flags::DISCONNECTED) {
             if self.flags.contains(Flags::STARTED) {
                 // TODO: add warning, write after EOF
-                self.encoder.write(payload)?;
+                self.encoder.write(payload.as_ref())?;
                 return Ok(WriterState::Done)
             } else {
                 // might be response to EXCEPT
-                self.encoder.get_mut().extend_from_slice(payload)
+                self.encoder.get_mut().extend_from_slice(payload.as_ref())
             }
         }
 
@@ -203,7 +201,7 @@ impl<T: AsyncWrite> Writer for H1Writer<T> {
         }
     }
 
-    fn write_eof(&mut self) -> Result<WriterState, io::Error> {
+    fn write_eof(&mut self) -> io::Result<WriterState> {
         self.encoder.write_eof()?;
 
         if !self.encoder.is_eof() {
diff --git a/src/server/h2writer.rs b/src/server/h2writer.rs
index c016de2e7..1cf1b0b61 100644
--- a/src/server/h2writer.rs
+++ b/src/server/h2writer.rs
@@ -7,7 +7,7 @@ use http::{Version, HttpTryFrom, Response};
 use http::header::{HeaderValue, CONNECTION, TRANSFER_ENCODING, DATE, CONTENT_LENGTH};
 
 use helpers;
-use body::Body;
+use body::{Body, Binary};
 use helpers::SharedBytes;
 use httprequest::HttpMessage;
 use httpresponse::HttpResponse;
@@ -52,7 +52,7 @@ impl H2Writer {
         }
     }
 
-    fn write_to_stream(&mut self) -> Result<WriterState, io::Error> {
+    fn write_to_stream(&mut self) -> io::Result<WriterState> {
         if !self.flags.contains(Flags::STARTED) {
             return Ok(WriterState::Done)
         }
@@ -115,11 +115,7 @@ impl Writer for H2Writer {
         Ok(Async::Ready(()))
     }
 
-    fn start(&mut self, req: &mut HttpMessage, msg: &mut HttpResponse)
-             -> Result<WriterState, io::Error>
-    {
-        // trace!("Prepare response with status: {:?}", msg.status());
-
+    fn start(&mut self, req: &mut HttpMessage, msg: &mut HttpResponse) -> io::Result<WriterState> {
         // prepare response
         self.flags.insert(Flags::STARTED);
         self.encoder = PayloadEncoder::new(self.buffer.clone(), req, msg);
@@ -183,16 +179,16 @@ impl Writer for H2Writer {
         }
     }
 
-    fn write(&mut self, payload: &[u8]) -> Result<WriterState, io::Error> {
+    fn write(&mut self, payload: Binary) -> io::Result<WriterState> {
         self.written = payload.len() as u64;
 
         if !self.flags.contains(Flags::DISCONNECTED) {
             if self.flags.contains(Flags::STARTED) {
                 // TODO: add warning, write after EOF
-                self.encoder.write(payload)?;
+                self.encoder.write(payload.as_ref())?;
             } else {
                 // might be response for EXCEPT
-                self.encoder.get_mut().extend_from_slice(payload)
+                self.encoder.get_mut().extend_from_slice(payload.as_ref())
             }
         }
 
@@ -203,7 +199,7 @@ impl Writer for H2Writer {
         }
     }
 
-    fn write_eof(&mut self) -> Result<WriterState, io::Error> {
+    fn write_eof(&mut self) -> io::Result<WriterState> {
         self.encoder.write_eof()?;
 
         self.flags.insert(Flags::EOF);
diff --git a/src/server/mod.rs b/src/server/mod.rs
index 566712077..44e2c7676 100644
--- a/src/server/mod.rs
+++ b/src/server/mod.rs
@@ -20,6 +20,7 @@ mod utils;
 pub use self::srv::HttpServer;
 pub use self::settings::ServerSettings;
 
+use body::Binary;
 use error::Error;
 use httprequest::{HttpMessage, HttpRequest};
 use httpresponse::HttpResponse;
@@ -96,12 +97,11 @@ pub enum WriterState {
 pub trait Writer {
     fn written(&self) -> u64;
 
-    fn start(&mut self, req: &mut HttpMessage, resp: &mut HttpResponse)
-             -> Result<WriterState, io::Error>;
+    fn start(&mut self, req: &mut HttpMessage, resp: &mut HttpResponse) -> io::Result<WriterState>;
 
-    fn write(&mut self, payload: &[u8]) -> Result<WriterState, io::Error>;
+    fn write(&mut self, payload: Binary) -> io::Result<WriterState>;
 
-    fn write_eof(&mut self) -> Result<WriterState, io::Error>;
+    fn write_eof(&mut self) -> io::Result<WriterState>;
 
     fn flush(&mut self) -> Poll<(), io::Error>;