diff --git a/tonic-macros/src/lib.rs b/tonic-macros/src/lib.rs
index 8ca9580..f648d84 100644
--- a/tonic-macros/src/lib.rs
+++ b/tonic-macros/src/lib.rs
@@ -68,9 +68,9 @@ pub fn server(attr: TokenStream, item: TokenStream) -> TokenStream {
         }
 
         impl _codegen::Service<_codegen::http::Request<()>> for GrpcServer {
-            type Response = tonic::Response<()>;
+            type Response = tonic::Response<tonic::body::BoxAsyncBody>;
             type Error = tonic::error::Never;
-            type Future = greeter::ResponseFuture;
+            type Future = _codegen::ResponseFuture2<Self::Response, Self::Error>;
 
             fn poll_ready(&mut self, _cx: &mut _codegen::Context<'_>) -> _codegen::Poll<Result<(), Self::Error>> {
                 Ok(()).into()
@@ -81,60 +81,35 @@ pub fn server(attr: TokenStream, item: TokenStream) -> TokenStream {
 
                 match request.uri().path() {
                     "/helloworld.Greeter/SayHello" => {
-                        // let kind = greeter::methods::SayHello(self.inner.clone());
-                        // greeter::ResponseFuture { kind: greeter::Kind::SayHello(kind) }
-                        self.inner.stream(request).await?;
+                        let inner = self.inner.clone();
+                        let fut = async move {
+                            let codec = tonic::codec::UnitCodec::default();
+                            let mut grpc = tonic::server::Grpc::new(codec);
+
+                            let response = match grpc.unary_request(request).await {
+                                Ok(request) => inner.#m_ident(request).await,
+                                Err(status) => Err(status),
+                            };
+
+                            let response = grpc.unary_response(response.unwrap())
+                                .await
+                                .map(|b| tonic::body::BoxAsyncBody::new(b));
+                                // .map(|b| tonic::body::BoxBody::map(b))
+
+                            Ok(response)
+                        };
+
+
+                        Box::pin(fut)
+                    },
+
+                    "helloworld.Greeter/SayHelloStream" => {
                         unimplemented!()
                     },
                     _ => unimplemented!("use grpc unimplemented")
                 }
             }
         }
-
-        // TODO: get actual service name
-        pub mod greeter {
-            use tonic::_codegen::*;
-
-            pub struct ResponseFuture {
-                pub kind: Kind,
-            }
-
-            pub enum Kind {
-                SayHello(methods::SayHello),
-            }
-
-            impl Future for ResponseFuture {
-                type Output = Result<tonic::Response<()>, tonic::error::Never>;
-
-                fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Self::Output> {
-                    unimplemented!()
-                }
-            }
-
-            pub mod methods {
-                use tonic::_codegen::*;
-
-                pub struct SayHello(pub std::sync::Arc<super::super::#s>);
-
-                impl Service<tonic::Request<()>> for SayHello {
-                    type Response = tonic::Response<()>;
-                    type Error = tonic::Status;
-                    type Future = ResponseFuture<Self::Response>;
-
-                    fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
-                        Ok(()).into()
-                    }
-
-                    fn call(&mut self, request: tonic::Request<()>) -> Self::Future {
-                        let inner = self.0.clone();
-
-                        Box::pin(async move {
-                            inner.#m_ident(request).await
-                        })
-                    }
-                }
-            }
-        }
     };
 
     original.extend(TokenStream::from(ts));
diff --git a/tonic-macros/tests/server.rs b/tonic-macros/tests/server.rs
index dc743bd..fdf7b26 100644
--- a/tonic-macros/tests/server.rs
+++ b/tonic-macros/tests/server.rs
@@ -32,13 +32,17 @@ impl MyGreeter {
         Ok(Response::new(()))
     }
 
-    pub async fn server_stream(&self, request: Request<()>) -> Result<impl Stream, Status> {
-        unimplemented!()
-    }
+    // pub async fn streaming(&self, request: Request<impl Stream>) -> Result<Response<impl Stream>, Status> {
+    //     unimplemented!()
+    // }
 
-    pub async fn client_stream(&self, request: Request<impl Stream>) -> Result<(), Status> {
-        unimplemented!()
-    }
+    // pub async fn server_stream(&self, request: Request<()>) -> Result<impl Stream, Status> {
+    //     unimplemented!()
+    // }
+
+    // pub async fn client_stream(&self, request: Request<impl Stream>) -> Result<(), Status> {
+    //     unimplemented!()
+    // }
 }
 
 #[tokio::test]
diff --git a/tonic/src/body.rs b/tonic/src/body.rs
index 64b3808..2a2ef06 100644
--- a/tonic/src/body.rs
+++ b/tonic/src/body.rs
@@ -4,10 +4,91 @@ use futures_core::Stream;
 use futures_util::{ready, TryStreamExt};
 use http::HeaderMap;
 use http_body::Body;
+use std::pin::Pin;
 use std::task::{Context, Poll};
 
 pub type BytesBuf = <Bytes as IntoBuf>::Buf;
 
+pub struct BoxBody {
+    inner: Box<dyn Body<Data = BytesBuf, Error = Status> + Send>,
+}
+
+impl BoxBody {
+    /// Create a new `BoxBody` mapping item and error to the default types.
+    pub fn map_from<B>(inner: B) -> Self
+    where
+        B: Body<Data = BytesBuf, Error = Status> + Send + 'static,
+    {
+        BoxBody {
+            inner: Box::new(inner),
+        }
+    }
+}
+
+impl Body for BoxBody {
+    type Data = BytesBuf;
+    type Error = Status;
+
+    fn is_end_stream(&self) -> bool {
+        self.inner.is_end_stream()
+    }
+
+    fn poll_data(&mut self, cx: &mut Context<'_>) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        self.inner.poll_data(cx)
+    }
+
+    fn poll_trailers(
+        &mut self,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<http::HeaderMap>, Self::Error>> {
+        self.inner.poll_trailers(cx)
+    }
+}
+
+pub struct BoxAsyncBody {
+    inner: Pin<Box<dyn Stream<Item = Result<BytesBuf, Status>> + Send>>,
+    error: Option<Status>,
+}
+
+impl BoxAsyncBody {
+    pub fn new<S>(inner: S) -> Self
+    where
+        S: Stream<Item = Result<crate::body::BytesBuf, Status>> + Send + 'static,
+    {
+        Self {
+            inner: Box::pin(inner),
+            error: None,
+        }
+    }
+}
+
+impl Body for BoxAsyncBody {
+    type Data = BytesBuf;
+    type Error = Status;
+
+    fn poll_data(&mut self, cx: &mut Context<'_>) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        match ready!(self.inner.try_poll_next_unpin(cx)) {
+            Some(Ok(d)) => Some(Ok(d)).into(),
+            Some(Err(status)) => {
+                self.error = Some(status);
+                None.into()
+            }
+            None => None.into(),
+        }
+    }
+
+    fn poll_trailers(&mut self, _cx: &mut Context<'_>) -> Poll<Result<Option<HeaderMap>, Status>> {
+        let status = if let Some(status) = self.error.take() {
+            status
+        } else {
+            Status::new(Code::Ok, "")
+        };
+
+        Poll::Ready(Ok(Some(status.to_header_map()?)))
+    }
+}
+
+#[derive(Debug)]
 pub struct AsyncBody<S> {
     inner: S,
     error: Option<Status>,
diff --git a/tonic/src/codec.rs b/tonic/src/codec.rs
index b90d086..5087bf3 100644
--- a/tonic/src/codec.rs
+++ b/tonic/src/codec.rs
@@ -1,6 +1,202 @@
+#![allow(dead_code)]
+
+use crate::{body::BytesBuf, Status};
+use async_stream::stream;
+use bytes::{Buf, BufMut, BytesMut, IntoBuf};
+use futures_core::TryStream;
+use futures_util::{future, TryStreamExt};
+use http_body::Body;
+use tokio_codec::{Decoder, Encoder};
+use tracing::{debug, trace};
+
 pub trait Codec {
     type Encode;
     type Decode;
 
-    type Encoder;
+    type Encoder: Encoder<Item = Self::Encode, Error = Status>;
+    type Decoder: Decoder<Item = Self::Decode, Error = Status>;
+
+    fn encoder(&mut self) -> Self::Encoder;
+    fn decoder(&mut self) -> Self::Decoder;
+}
+
+pub async fn encode<T, U>(
+    mut encoder: T,
+    mut source: U,
+) -> impl TryStream<Ok = BytesBuf, Error = Status>
+where
+    T: Encoder<Error = Status>,
+    U: TryStream<Ok = T::Item, Error = Status> + Unpin,
+{
+    stream! {
+        let mut buf = BytesMut::with_capacity(1024);
+
+        loop {
+            match source.try_next().await {
+                Ok(Some(item)) => {
+                    encoder.encode(item, &mut buf).map_err(drop).unwrap();
+                    let len = buf.len();
+                    yield Ok(buf.split_to(len).freeze().into_buf());
+                },
+                Ok(None) => break,
+                Err(status) => yield Err(status),
+            }
+        }
+    }
+}
+
+pub fn decode<T, B>(mut decoder: T, mut source: B) -> impl TryStream<Ok = T::Item, Error = Status>
+where
+    T: Decoder<Error = Status>,
+    T::Item: Unpin + 'static,
+    B: Body,
+    B::Error: Into<crate::Error>,
+{
+    stream! {
+        let mut buf = BytesMut::with_capacity(1024);
+        let mut state = State::ReadHeader;
+
+        loop {
+            // TODO: use try_stream! and ?
+            if let Some(item) = decode_chunk(&mut decoder, &mut buf, &mut state).unwrap() {
+                yield Ok(item);
+            }
+
+            let chunk = match future::poll_fn(|cx| source.poll_data(cx)).await {
+                Some(Ok(d)) => Some(d),
+                Some(Err(e)) => {
+                    let err = e.into();
+                    debug!("decoder inner stream error: {:?}", err);
+                    let status = Status::from_error(&*err);
+                    yield Err(status);
+                    break;
+                },
+                None => None,
+            };
+
+            if let Some(data)= chunk {
+                buf.put(data);
+            } else {
+                if buf.has_remaining_mut() {
+                    trace!("unexpected EOF decoding stream");
+                    // yield Err(Status::new(
+                    //     Code::Internal,
+                    //     "Unexpected EOF decoding stream.".to_string(),
+                    // ));
+                } else {
+                    break;
+                }
+            }
+
+            // TODO: poll_trailers for Response status code
+        }
+    }
+}
+
+fn decode_chunk<T>(
+    decoder: &mut T,
+    buf1: &mut BytesMut,
+    state: &mut State,
+) -> Result<Option<T::Item>, Status>
+where
+    T: Decoder<Error = Status>,
+{
+    let mut buf = (&buf1[..]).into_buf();
+
+    if let State::ReadHeader = state {
+        if buf.remaining() < 5 {
+            return Ok(None);
+        }
+
+        let is_compressed = match buf.get_u8() {
+            0 => false,
+            1 => {
+                trace!("message compressed, compression not supported yet");
+                return Err(crate::Status::new(
+                    crate::Code::Unimplemented,
+                    "Message compressed, compression not supported yet.".to_string(),
+                ));
+            }
+            f => {
+                trace!("unexpected compression flag");
+                return Err(crate::Status::new(
+                    crate::Code::Internal,
+                    format!("Unexpected compression flag: {}", f),
+                ));
+            }
+        };
+        let len = buf.get_u32_be() as usize;
+
+        *state = State::ReadBody {
+            compression: is_compressed,
+            len,
+        }
+    }
+
+    if let State::ReadBody { len, .. } = state {
+        if buf.remaining() < *len {
+            return Ok(None);
+        }
+
+        match decoder.decode(buf1) {
+            Ok(Some(msg)) => {
+                *state = State::ReadHeader;
+                return Ok(Some(msg));
+            }
+            Ok(None) => return Ok(None),
+            Err(e) => {
+                return Err(e);
+            }
+        }
+    }
+
+    Ok(None)
+}
+
+#[derive(Default)]
+pub struct UnitCodec;
+
+impl Codec for UnitCodec {
+    type Encode = ();
+    type Decode = ();
+
+    type Encoder = UnitEncoder;
+    type Decoder = UnitDecoder;
+
+    fn encoder(&mut self) -> Self::Encoder {
+        UnitEncoder
+    }
+
+    fn decoder(&mut self) -> Self::Decoder {
+        UnitDecoder
+    }
+}
+
+pub struct UnitEncoder;
+
+impl Encoder for UnitEncoder {
+    type Item = ();
+    type Error = crate::Status;
+
+    fn encode(&mut self, _item: Self::Item, _buf: &mut BytesMut) -> Result<(), Self::Error> {
+        unimplemented!()
+    }
+}
+
+pub struct UnitDecoder;
+
+impl Decoder for UnitDecoder {
+    type Item = ();
+    type Error = Status;
+
+    fn decode(&mut self, _buf: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
+        Ok(Some(()))
+    }
+}
+
+#[derive(Debug)]
+enum State {
+    ReadHeader,
+    ReadBody { compression: bool, len: usize },
+    Done,
 }
diff --git a/tonic/src/lib.rs b/tonic/src/lib.rs
index b59cebf..fc466ce 100644
--- a/tonic/src/lib.rs
+++ b/tonic/src/lib.rs
@@ -1,16 +1,17 @@
-#![feature(async_await, type_alias_impl_trait)]
+#![feature(async_await)]
+#![recursion_limit = "256"]
 
 //! gRPC implementation
 
+pub mod body;
+pub mod codec;
 #[doc(hidden)]
 pub mod error;
 pub mod metadata;
+pub mod server;
 
-mod body;
-mod codec;
 mod request;
 mod response;
-mod server;
 mod status;
 
 pub use request::Request;
@@ -40,6 +41,8 @@ pub mod _codegen {
     pub use tower_service::Service;
     pub type ResponseFuture<T> =
         self::Pin<Box<dyn self::Future<Output = Result<T, crate::Status>> + Send + 'static>>;
+    pub type ResponseFuture2<T, E> =
+        self::Pin<Box<dyn self::Future<Output = Result<T, E>> + Send + 'static>>;
 
     pub mod http {
         pub use http::*;
diff --git a/tonic/src/server/mod.rs b/tonic/src/server/mod.rs
index 59336e0..dc36d1a 100644
--- a/tonic/src/server/mod.rs
+++ b/tonic/src/server/mod.rs
@@ -1,206 +1,172 @@
-#![allow(dead_code)]
-
-use crate::{Code, Request, Response, Status};
-use async_stream::stream;
-use bytes::{Buf, BufMut, Bytes, BytesMut, IntoBuf};
-use futures_core::{Stream, TryStream};
-use futures_util::{future, stream, StreamExt, TryStreamExt};
+use crate::{
+    codec::{self, Codec},
+    Request, Status,
+};
+use futures_core::{Future, TryStream};
+use futures_util::{future, stream, TryStreamExt};
 use http_body::Body;
-use std::future::Future;
-use tokio_codec::{Decoder, Encoder};
-use tower_service::Service;
-use tracing::{debug, trace};
+use std::pin::Pin;
 
-pub trait Codec {
-    type Encode;
-    type Decode;
+pub struct Grpc<T> {
+    codec: T,
 }
 
-pub struct Encode<T, U> {
-    encoder: T,
-    source: U,
+// type UnaryFuture<B> = Once<Ready<Result<B, Status>>>;
+// type ResponseBody = impl Stream<Item = Result<crate::body::BytesBuf, Status>>;
+
+pub trait UnaryService<R> {
+    /// Protobuf response message type
+    type Response;
+
+    /// Response future
+    type Future: Future<Output = Result<crate::Response<Self::Response>, Status>>;
+
+    /// Call the service
+    fn call(&mut self, request: Request<R>) -> Self::Future;
 }
 
-impl<T, U> Encode<T, U>
+pub trait ServerStreamingService<R> {
+    /// Protobuf response message type
+    type Response;
+
+    /// Stream of outbound response messages
+    type ResponseStream: TryStream<Ok = Self::Response, Error = crate::Status> + Unpin;
+
+    /// Response future
+    type Future: Future<Output = Result<crate::Response<Self::ResponseStream>, crate::Status>>;
+
+    /// Call the service
+    fn call(&mut self, request: Request<R>) -> Self::Future;
+}
+
+pub trait ClientStreamingService<RequestStream> {
+    /// Protobuf response message type
+    type Response;
+
+    /// Response future
+    type Future: Future<Output = Result<crate::Response<Self::Response>, Status>>;
+
+    /// Call the service
+    fn call(&mut self, request: Request<RequestStream>) -> Self::Future;
+}
+
+pub trait StreamingService<RequestStream> {
+    /// Protobuf response message type
+    type Response;
+
+    /// Stream of outbound response messages
+    type ResponseStream: TryStream<Ok = Self::Response, Error = crate::Status> + Unpin;
+
+    /// Response future
+    type Future: Future<Output = Result<crate::Response<Self::ResponseStream>, crate::Status>>;
+
+    /// Call the service
+    fn call(&mut self, request: Request<RequestStream>) -> Self::Future;
+}
+
+type BoxStream<T> = Pin<Box<dyn TryStream<Ok = T, Error = Status> + Send + 'static>>;
+
+impl<T> Grpc<T>
 where
-    T: Encoder,
-    U: TryStream<Ok = T::Item, Error = Status> + Unpin,
+    T: Codec,
+    T::Decode: Unpin + 'static,
+    T::Encode: Unpin + 'static,
 {
-    pub fn new(encoder: T, source: U) -> Self {
-        Encode { encoder, source }
+    pub fn new(codec: T) -> Self {
+        Self { codec }
     }
 
-    pub fn encode<'a>(
-        &'a mut self,
-        buf: &'a mut BytesMut,
-    ) -> impl Stream<Item = Result<crate::body::BytesBuf, Status>> + 'a {
-        stream! {
-            loop {
-                match self.source.try_next().await {
-                    Ok(Some(item)) => {
-                        self.encoder.encode(item, buf).map_err(drop).unwrap();
-                        let len = buf.len();
-                        yield Ok(buf.split_to(len).freeze().into_buf());
-                    },
-                    Ok(None) => break,
-                    Err(status) => yield Err(status),
-                }
-            }
-        }
-    }
-}
-
-pub struct Streaming<T> {
-    decoder: T,
-    buf: BytesMut,
-    state: State,
-}
-
-#[derive(Debug)]
-enum State {
-    ReadHeader,
-    ReadBody { compression: bool, len: usize },
-    Done,
-}
-
-impl<T> Streaming<T>
-where
-    T: Decoder,
-    T::Item: Unpin + 'static,
-{
-    pub fn decode<'a, B>(
-        &'a mut self,
-        source: &'a mut B,
-    ) -> impl Stream<Item = Result<T::Item, Status>> + 'a
+    pub async fn unary<S, B>(
+        &mut self,
+        mut service: S,
+        req: http::Request<B>,
+    ) -> http::Response<impl TryStream<Ok = crate::body::BytesBuf, Error = Status>>
     where
+        S: UnaryService<T::Decode, Response = T::Encode>,
         B: Body,
         B::Error: Into<crate::Error>,
     {
-        stream! {
-            loop {
-                // TODO: use try_stream! and ?
-                if let Some(item) = self.decode_chunk().unwrap() {
-                    yield Ok(item);
-                }
+        let (_parts, body) = req.into_parts();
+        let stream = codec::decode(self.codec.decoder(), body).into_stream();
+        futures_util::pin_mut!(stream);
+        let message = stream.try_next().await.unwrap().unwrap();
+        let request = Request::new(message);
+        let response = service.call(request).await.unwrap();
+        let message = response.into_inner();
+        let source = stream::once(future::ok(message));
+        let body = codec::encode(self.codec.encoder(), source).await;
 
-                let chunk = match future::poll_fn(|cx| source.poll_data(cx)).await {
-                    Some(Ok(d)) => Some(d),
-                    Some(Err(e)) => {
-                        let err = e.into();
-                        debug!("decoder inner stream error: {:?}", err);
-                        let status = Status::from_error(&*err);
-                        yield Err(status);
-                        break;
-                    },
-                    None => None,
-                };
-
-                if let Some(data)= chunk {
-                    self.buf.put(data);
-                } else {
-                    if self.buf.has_remaining_mut() {
-                        trace!("unexpected EOF decoding stream");
-                        yield Err(Status::new(
-                            Code::Internal,
-                            "Unexpected EOF decoding stream.".to_string(),
-                        ));
-                    } else {
-                        break;
-                    }
-                }
-            }
-        }
+        http::Response::new(body)
     }
 
-    fn decode_chunk(&mut self) -> Result<Option<T::Item>, Status> {
-        let buf = (&self.buf).into_buf();
+    pub async fn server_streaming<S, B>(
+        &mut self,
+        mut service: S,
+        req: http::Request<B>,
+    ) -> http::Response<impl TryStream<Ok = crate::body::BytesBuf, Error = Status>>
+    where
+        S: ServerStreamingService<T::Decode, Response = T::Encode>,
+        B: Body,
+        B::Error: Into<crate::Error>,
+    {
+        let (_parts, body) = req.into_parts();
+        let stream = codec::decode(self.codec.decoder(), body).into_stream();
+        futures_util::pin_mut!(stream);
+        let message = stream.try_next().await.unwrap().unwrap();
+        let request = Request::new(message);
+        let response = service.call(request).await.unwrap();
+        let source = response.into_inner();
+        let body = codec::encode(self.codec.encoder(), source).await;
 
-        if let State::ReadHeader = self.state {
-            if buf.remaining() < 5 {
-                return Ok(None);
-            }
+        http::Response::new(body)
+    }
 
-            let is_compressed = match buf.get_u8() {
-                0 => false,
-                1 => {
-                    trace!("message compressed, compression not supported yet");
-                    return Err(crate::Status::new(
-                        crate::Code::Unimplemented,
-                        "Message compressed, compression not supported yet.".to_string(),
-                    ));
-                }
-                f => {
-                    trace!("unexpected compression flag");
-                    return Err(crate::Status::new(
-                        crate::Code::Internal,
-                        format!("Unexpected compression flag: {}", f),
-                    ));
-                }
-            };
-            let len = (&self.buf[..]).into_buf().get_u32_be() as usize;
+    pub async fn client_streaming<S, B>(
+        &mut self,
+        mut service: S,
+        req: http::Request<B>,
+    ) -> http::Response<impl TryStream<Ok = crate::body::BytesBuf, Error = Status>>
+    where
+        S: ClientStreamingService<BoxStream<T::Decode>, Response = T::Encode>,
+        T::Decode: Send,
+        T::Decoder: Send + 'static,
+        B: Body + Send + 'static,
+        B::Data: Send,
+        B::Error: Into<crate::Error> + Send,
+    {
+        let (_parts, body) = req.into_parts();
+        let stream = codec::decode(self.codec.decoder(), body);
+        let stream = Box::pin(stream) as BoxStream<T::Decode>;
+        let request = Request::new(stream);
+        let response = service.call(request).await.unwrap();
+        let message = response.into_inner();
+        let source = stream::once(future::ok(message));
+        let body = codec::encode(self.codec.encoder(), source).await;
 
-            self.state = State::ReadBody {
-                compression: is_compressed,
-                len,
-            }
-        }
+        http::Response::new(body)
+    }
 
-        if let State::ReadBody { len, .. } = self.state {
-            if buf.remaining() < len {
-                return Ok(None);
-            }
+    pub async fn streaming<S, B>(
+        &mut self,
+        mut service: S,
+        req: http::Request<B>,
+    ) -> http::Response<impl TryStream<Ok = crate::body::BytesBuf, Error = Status>>
+    where
+        S: StreamingService<BoxStream<T::Decode>, Response = T::Encode>,
+        T::Decode: Send,
+        T::Decoder: Send + 'static,
+        B: Body + Send + 'static,
+        B::Data: Send,
+        B::Error: Into<crate::Error> + Send,
+    {
+        let (_parts, body) = req.into_parts();
+        let stream = codec::decode(self.codec.decoder(), body);
+        let stream = Box::pin(stream) as BoxStream<T::Decode>;
+        let request = Request::new(stream);
+        let response = service.call(request).await.unwrap();
+        let source = response.into_inner();
+        let body = codec::encode(self.codec.encoder(), source).await;
 
-            match self.decoder.decode(&mut self.buf) {
-                Ok(Some(msg)) => {
-                    self.state = State::ReadHeader;
-                    return Ok(Some(msg));
-                }
-                Err(e) => {
-                    return Err(e);
-                }
-            }
-        }
-
-        Ok(None)
+        http::Response::new(body)
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use crate::body::AsyncBody;
-    use crate::server::Encode;
-    use bytes::{Bytes, BytesMut};
-    use tokio_codec::BytesCodec;
-
-    #[test]
-    fn body() {
-        let stream = futures_util::stream::iter(vec![Ok(Bytes::new())]);
-        let mut encode = Encode::new(BytesCodec::new(), stream);
-
-        let mut buf = BytesMut::with_capacity(1024);
-        AsyncBody::new(Box::pin(encode.encode(&mut buf)));
-    }
-}
-
-// impl<T, U> http_body::Body for Encode<T, U>
-
-// pub struct Grpc<T> {
-//     opdec: T,
-// }
-
-// impl<T: Codec> Grpc<T> {
-//     pub async fn unary<B>(&mut self, message: B) -> Result<Response<B>> {
-//         self.server_streaming(stream::once(message)).await
-//     }
-
-//     pub async fn server_streaming<B>(
-//         &mut self,
-//         stream: impl Stream,
-//     ) -> Result<Response<impl http_body::Body>> {
-//         unimplemetned!()
-//     }
-
-//     fn map_request<B>(&mut self, request: http::Request<B>) -> Request<B> {
-//         Request::from_http(request)
-//     }
-// }
diff --git a/tonic/src/status.rs b/tonic/src/status.rs
index 5443534..55bfca3 100644
--- a/tonic/src/status.rs
+++ b/tonic/src/status.rs
@@ -289,6 +289,12 @@ impl From<Status> for h2::Error {
     }
 }
 
+impl From<std::io::Error> for Status {
+    fn from(_io: std::io::Error) -> Self {
+        unimplemented!()
+    }
+}
+
 impl fmt::Display for Status {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(