diff --git a/src/lib.rs b/src/lib.rs
index a740e03e1..b33f1186a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -244,7 +244,7 @@ pub mod dev {
     pub use info::ConnectionInfo;
     pub use json::{JsonBody, JsonConfig};
     pub use param::{FromParam, Params};
-    pub use payload::{Payload, PayloadHelper};
+    pub use payload::{Payload, PayloadBuffer};
     pub use resource::Resource;
     pub use route::Route;
     pub use router::{ResourceDef, ResourceInfo, ResourceType, Router};
diff --git a/src/multipart.rs b/src/multipart.rs
index 1735085dd..d4b6059f2 100644
--- a/src/multipart.rs
+++ b/src/multipart.rs
@@ -13,7 +13,7 @@ use httparse;
 use mime;
 
 use error::{MultipartError, ParseError, PayloadError};
-use payload::PayloadHelper;
+use payload::PayloadBuffer;
 
 const MAX_HEADERS: usize = 32;
 
@@ -97,7 +97,7 @@ where
                 safety: Safety::new(),
                 inner: Some(Rc::new(RefCell::new(InnerMultipart {
                     boundary,
-                    payload: PayloadRef::new(PayloadHelper::new(stream)),
+                    payload: PayloadRef::new(PayloadBuffer::new(stream)),
                     state: InnerState::FirstBoundary,
                     item: InnerMultipartItem::None,
                 }))),
@@ -133,7 +133,7 @@ impl<S> InnerMultipart<S>
 where
     S: Stream<Item = Bytes, Error = PayloadError>,
 {
-    fn read_headers(payload: &mut PayloadHelper<S>) -> Poll<HeaderMap, MultipartError> {
+    fn read_headers(payload: &mut PayloadBuffer<S>) -> Poll<HeaderMap, MultipartError> {
         match payload.read_until(b"\r\n\r\n")? {
             Async::NotReady => Ok(Async::NotReady),
             Async::Ready(None) => Err(MultipartError::Incomplete),
@@ -164,7 +164,7 @@ where
     }
 
     fn read_boundary(
-        payload: &mut PayloadHelper<S>, boundary: &str,
+        payload: &mut PayloadBuffer<S>, boundary: &str,
     ) -> Poll<bool, MultipartError> {
         // TODO: need to read epilogue
         match payload.readline()? {
@@ -190,7 +190,7 @@ where
     }
 
     fn skip_until_boundary(
-        payload: &mut PayloadHelper<S>, boundary: &str,
+        payload: &mut PayloadBuffer<S>, boundary: &str,
     ) -> Poll<bool, MultipartError> {
         let mut eof = false;
         loop {
@@ -490,7 +490,7 @@ where
     /// Reads body part content chunk of the specified size.
     /// The body part must has `Content-Length` header with proper value.
     fn read_len(
-        payload: &mut PayloadHelper<S>, size: &mut u64,
+        payload: &mut PayloadBuffer<S>, size: &mut u64,
     ) -> Poll<Option<Bytes>, MultipartError> {
         if *size == 0 {
             Ok(Async::Ready(None))
@@ -503,7 +503,7 @@ where
                     *size -= len;
                     let ch = chunk.split_to(len as usize);
                     if !chunk.is_empty() {
-                        payload.unread_data(chunk);
+                        payload.unprocessed(chunk);
                     }
                     Ok(Async::Ready(Some(ch)))
                 }
@@ -515,14 +515,14 @@ where
     /// Reads content chunk of body part with unknown length.
     /// The `Content-Length` header for body part is not necessary.
     fn read_stream(
-        payload: &mut PayloadHelper<S>, boundary: &str,
+        payload: &mut PayloadBuffer<S>, boundary: &str,
     ) -> Poll<Option<Bytes>, MultipartError> {
         match payload.read_until(b"\r")? {
             Async::NotReady => Ok(Async::NotReady),
             Async::Ready(None) => Err(MultipartError::Incomplete),
             Async::Ready(Some(mut chunk)) => {
                 if chunk.len() == 1 {
-                    payload.unread_data(chunk);
+                    payload.unprocessed(chunk);
                     match payload.read_exact(boundary.len() + 4)? {
                         Async::NotReady => Ok(Async::NotReady),
                         Async::Ready(None) => Err(MultipartError::Incomplete),
@@ -531,12 +531,12 @@ where
                                 && &chunk[2..4] == b"--"
                                 && &chunk[4..] == boundary.as_bytes()
                             {
-                                payload.unread_data(chunk);
+                                payload.unprocessed(chunk);
                                 Ok(Async::Ready(None))
                             } else {
                                 // \r might be part of data stream
                                 let ch = chunk.split_to(1);
-                                payload.unread_data(chunk);
+                                payload.unprocessed(chunk);
                                 Ok(Async::Ready(Some(ch)))
                             }
                         }
@@ -544,7 +544,7 @@ where
                 } else {
                     let to = chunk.len() - 1;
                     let ch = chunk.split_to(to);
-                    payload.unread_data(chunk);
+                    payload.unprocessed(chunk);
                     Ok(Async::Ready(Some(ch)))
                 }
             }
@@ -592,27 +592,27 @@ where
 }
 
 struct PayloadRef<S> {
-    payload: Rc<UnsafeCell<PayloadHelper<S>>>,
+    payload: Rc<UnsafeCell<PayloadBuffer<S>>>,
 }
 
 impl<S> PayloadRef<S>
 where
     S: Stream<Item = Bytes, Error = PayloadError>,
 {
-    fn new(payload: PayloadHelper<S>) -> PayloadRef<S> {
+    fn new(payload: PayloadBuffer<S>) -> PayloadRef<S> {
         PayloadRef {
             payload: Rc::new(payload.into()),
         }
     }
 
-    fn get_mut<'a, 'b>(&'a self, s: &'b Safety) -> Option<&'a mut PayloadHelper<S>>
+    fn get_mut<'a, 'b>(&'a self, s: &'b Safety) -> Option<&'a mut PayloadBuffer<S>>
     where
         'a: 'b,
     {
         // Unsafe: Invariant is inforced by Safety Safety is used as ref counter,
         // only top most ref can have mutable access to payload.
         if s.current() {
-            let payload: &mut PayloadHelper<S> = unsafe { &mut *self.payload.get() };
+            let payload: &mut PayloadBuffer<S> = unsafe { &mut *self.payload.get() };
             Some(payload)
         } else {
             None
diff --git a/src/payload.rs b/src/payload.rs
index fd4e57af3..b20bec652 100644
--- a/src/payload.rs
+++ b/src/payload.rs
@@ -280,18 +280,20 @@ impl Inner {
     }
 }
 
-pub struct PayloadHelper<S> {
+/// Payload buffer
+pub struct PayloadBuffer<S> {
     len: usize,
     items: VecDeque<Bytes>,
     stream: S,
 }
 
-impl<S> PayloadHelper<S>
+impl<S> PayloadBuffer<S>
 where
     S: Stream<Item = Bytes, Error = PayloadError>,
 {
+    /// Create new `PayloadBuffer` instance
     pub fn new(stream: S) -> Self {
-        PayloadHelper {
+        PayloadBuffer {
             len: 0,
             items: VecDeque::new(),
             stream,
@@ -316,6 +318,7 @@ where
         })
     }
 
+    /// Read first available chunk of bytes
     #[inline]
     pub fn readany(&mut self) -> Poll<Option<Bytes>, PayloadError> {
         if let Some(data) = self.items.pop_front() {
@@ -330,6 +333,7 @@ where
         }
     }
 
+    /// Check if buffer contains enough bytes
     #[inline]
     pub fn can_read(&mut self, size: usize) -> Poll<Option<bool>, PayloadError> {
         if size <= self.len {
@@ -343,6 +347,7 @@ where
         }
     }
 
+    /// Return reference to the first chunk of data
     #[inline]
     pub fn get_chunk(&mut self) -> Poll<Option<&[u8]>, PayloadError> {
         if self.items.is_empty() {
@@ -358,6 +363,7 @@ where
         }
     }
 
+    /// Read exact number of bytes
     #[inline]
     pub fn read_exact(&mut self, size: usize) -> Poll<Option<Bytes>, PayloadError> {
         if size <= self.len {
@@ -392,8 +398,9 @@ where
         }
     }
 
+    /// Remove specified amount if bytes from buffer
     #[inline]
-    pub fn drop_payload(&mut self, size: usize) {
+    pub fn drop_bytes(&mut self, size: usize) {
         if size <= self.len {
             self.len -= size;
 
@@ -410,6 +417,7 @@ where
         }
     }
 
+    /// Copy buffered data
     pub fn copy(&mut self, size: usize) -> Poll<Option<BytesMut>, PayloadError> {
         if size <= self.len {
             let mut buf = BytesMut::with_capacity(size);
@@ -431,6 +439,7 @@ where
         }
     }
 
+    /// Read until specified ending
     pub fn read_until(&mut self, line: &[u8]) -> Poll<Option<Bytes>, PayloadError> {
         let mut idx = 0;
         let mut num = 0;
@@ -486,16 +495,18 @@ where
         }
     }
 
+    /// Read bytes until new line delimiter
     pub fn readline(&mut self) -> Poll<Option<Bytes>, PayloadError> {
         self.read_until(b"\n")
     }
 
-    pub fn unread_data(&mut self, data: Bytes) {
+    /// Put unprocessed data back to the buffer
+    pub fn unprocessed(&mut self, data: Bytes) {
         self.len += data.len();
         self.items.push_front(data);
     }
 
-    #[allow(dead_code)]
+    /// Get remaining data from the buffer
     pub fn remaining(&mut self) -> Bytes {
         self.items
             .iter_mut()
@@ -535,7 +546,7 @@ mod tests {
             .unwrap()
             .block_on(lazy(|| {
                 let (_, payload) = Payload::new(false);
-                let mut payload = PayloadHelper::new(payload);
+                let mut payload = PayloadBuffer::new(payload);
 
                 assert_eq!(payload.len, 0);
                 assert_eq!(Async::NotReady, payload.readany().ok().unwrap());
@@ -552,7 +563,7 @@ mod tests {
             .unwrap()
             .block_on(lazy(|| {
                 let (mut sender, payload) = Payload::new(false);
-                let mut payload = PayloadHelper::new(payload);
+                let mut payload = PayloadBuffer::new(payload);
 
                 assert_eq!(Async::NotReady, payload.readany().ok().unwrap());
                 sender.feed_data(Bytes::from("data"));
@@ -577,7 +588,7 @@ mod tests {
             .unwrap()
             .block_on(lazy(|| {
                 let (mut sender, payload) = Payload::new(false);
-                let mut payload = PayloadHelper::new(payload);
+                let mut payload = PayloadBuffer::new(payload);
 
                 assert_eq!(Async::NotReady, payload.readany().ok().unwrap());
 
@@ -595,7 +606,7 @@ mod tests {
             .unwrap()
             .block_on(lazy(|| {
                 let (mut sender, payload) = Payload::new(false);
-                let mut payload = PayloadHelper::new(payload);
+                let mut payload = PayloadBuffer::new(payload);
 
                 sender.feed_data(Bytes::from("line1"));
                 sender.feed_data(Bytes::from("line2"));
@@ -624,7 +635,7 @@ mod tests {
             .unwrap()
             .block_on(lazy(|| {
                 let (mut sender, payload) = Payload::new(false);
-                let mut payload = PayloadHelper::new(payload);
+                let mut payload = PayloadBuffer::new(payload);
 
                 assert_eq!(Async::NotReady, payload.read_exact(2).ok().unwrap());
 
@@ -658,7 +669,7 @@ mod tests {
             .unwrap()
             .block_on(lazy(|| {
                 let (mut sender, payload) = Payload::new(false);
-                let mut payload = PayloadHelper::new(payload);
+                let mut payload = PayloadBuffer::new(payload);
 
                 assert_eq!(Async::NotReady, payload.read_until(b"ne").ok().unwrap());
 
diff --git a/src/ws/client.rs b/src/ws/client.rs
index 4295905ab..989220474 100644
--- a/src/ws/client.rs
+++ b/src/ws/client.rs
@@ -20,7 +20,7 @@ use body::{Binary, Body};
 use error::{Error, UrlParseError};
 use header::IntoHeaderValue;
 use httpmessage::HttpMessage;
-use payload::PayloadHelper;
+use payload::PayloadBuffer;
 
 use client::{
     ClientConnector, ClientRequest, ClientRequestBuilder, HttpResponseParserError,
@@ -275,7 +275,7 @@ impl Client {
 
 struct Inner {
     tx: UnboundedSender<Bytes>,
-    rx: PayloadHelper<Box<Pipeline>>,
+    rx: PayloadBuffer<Box<Pipeline>>,
     closed: bool,
 }
 
@@ -431,7 +431,7 @@ impl Future for ClientHandshake {
 
         let inner = Inner {
             tx: self.tx.take().unwrap(),
-            rx: PayloadHelper::new(resp.payload()),
+            rx: PayloadBuffer::new(resp.payload()),
             closed: false,
         };
 
diff --git a/src/ws/frame.rs b/src/ws/frame.rs
index 70065774b..006d322f6 100644
--- a/src/ws/frame.rs
+++ b/src/ws/frame.rs
@@ -6,7 +6,7 @@ use std::fmt;
 
 use body::Binary;
 use error::PayloadError;
-use payload::PayloadHelper;
+use payload::PayloadBuffer;
 
 use ws::mask::apply_mask;
 use ws::proto::{CloseCode, CloseReason, OpCode};
@@ -48,7 +48,7 @@ impl Frame {
 
     #[cfg_attr(feature = "cargo-clippy", allow(type_complexity))]
     fn read_copy_md<S>(
-        pl: &mut PayloadHelper<S>, server: bool, max_size: usize,
+        pl: &mut PayloadBuffer<S>, server: bool, max_size: usize,
     ) -> Poll<Option<(usize, bool, OpCode, usize, Option<u32>)>, ProtocolError>
     where
         S: Stream<Item = Bytes, Error = PayloadError>,
@@ -201,7 +201,7 @@ impl Frame {
 
     /// Parse the input stream into a frame.
     pub fn parse<S>(
-        pl: &mut PayloadHelper<S>, server: bool, max_size: usize,
+        pl: &mut PayloadBuffer<S>, server: bool, max_size: usize,
     ) -> Poll<Option<Frame>, ProtocolError>
     where
         S: Stream<Item = Bytes, Error = PayloadError>,
@@ -230,7 +230,7 @@ impl Frame {
         }
 
         // remove prefix
-        pl.drop_payload(idx);
+        pl.drop_bytes(idx);
 
         // no need for body
         if length == 0 {
@@ -393,14 +393,14 @@ mod tests {
 
     #[test]
     fn test_parse() {
-        let mut buf = PayloadHelper::new(once(Ok(BytesMut::from(
+        let mut buf = PayloadBuffer::new(once(Ok(BytesMut::from(
             &[0b0000_0001u8, 0b0000_0001u8][..],
         ).freeze())));
         assert!(is_none(&Frame::parse(&mut buf, false, 1024)));
 
         let mut buf = BytesMut::from(&[0b0000_0001u8, 0b0000_0001u8][..]);
         buf.extend(b"1");
-        let mut buf = PayloadHelper::new(once(Ok(buf.freeze())));
+        let mut buf = PayloadBuffer::new(once(Ok(buf.freeze())));
 
         let frame = extract(Frame::parse(&mut buf, false, 1024));
         assert!(!frame.finished);
@@ -411,7 +411,7 @@ mod tests {
     #[test]
     fn test_parse_length0() {
         let buf = BytesMut::from(&[0b0000_0001u8, 0b0000_0000u8][..]);
-        let mut buf = PayloadHelper::new(once(Ok(buf.freeze())));
+        let mut buf = PayloadBuffer::new(once(Ok(buf.freeze())));
 
         let frame = extract(Frame::parse(&mut buf, false, 1024));
         assert!(!frame.finished);
@@ -422,13 +422,13 @@ mod tests {
     #[test]
     fn test_parse_length2() {
         let buf = BytesMut::from(&[0b0000_0001u8, 126u8][..]);
-        let mut buf = PayloadHelper::new(once(Ok(buf.freeze())));
+        let mut buf = PayloadBuffer::new(once(Ok(buf.freeze())));
         assert!(is_none(&Frame::parse(&mut buf, false, 1024)));
 
         let mut buf = BytesMut::from(&[0b0000_0001u8, 126u8][..]);
         buf.extend(&[0u8, 4u8][..]);
         buf.extend(b"1234");
-        let mut buf = PayloadHelper::new(once(Ok(buf.freeze())));
+        let mut buf = PayloadBuffer::new(once(Ok(buf.freeze())));
 
         let frame = extract(Frame::parse(&mut buf, false, 1024));
         assert!(!frame.finished);
@@ -439,13 +439,13 @@ mod tests {
     #[test]
     fn test_parse_length4() {
         let buf = BytesMut::from(&[0b0000_0001u8, 127u8][..]);
-        let mut buf = PayloadHelper::new(once(Ok(buf.freeze())));
+        let mut buf = PayloadBuffer::new(once(Ok(buf.freeze())));
         assert!(is_none(&Frame::parse(&mut buf, false, 1024)));
 
         let mut buf = BytesMut::from(&[0b0000_0001u8, 127u8][..]);
         buf.extend(&[0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 0u8, 4u8][..]);
         buf.extend(b"1234");
-        let mut buf = PayloadHelper::new(once(Ok(buf.freeze())));
+        let mut buf = PayloadBuffer::new(once(Ok(buf.freeze())));
 
         let frame = extract(Frame::parse(&mut buf, false, 1024));
         assert!(!frame.finished);
@@ -458,7 +458,7 @@ mod tests {
         let mut buf = BytesMut::from(&[0b0000_0001u8, 0b1000_0001u8][..]);
         buf.extend(b"0001");
         buf.extend(b"1");
-        let mut buf = PayloadHelper::new(once(Ok(buf.freeze())));
+        let mut buf = PayloadBuffer::new(once(Ok(buf.freeze())));
 
         assert!(Frame::parse(&mut buf, false, 1024).is_err());
 
@@ -472,7 +472,7 @@ mod tests {
     fn test_parse_frame_no_mask() {
         let mut buf = BytesMut::from(&[0b0000_0001u8, 0b0000_0001u8][..]);
         buf.extend(&[1u8]);
-        let mut buf = PayloadHelper::new(once(Ok(buf.freeze())));
+        let mut buf = PayloadBuffer::new(once(Ok(buf.freeze())));
 
         assert!(Frame::parse(&mut buf, true, 1024).is_err());
 
@@ -486,7 +486,7 @@ mod tests {
     fn test_parse_frame_max_size() {
         let mut buf = BytesMut::from(&[0b0000_0001u8, 0b0000_0010u8][..]);
         buf.extend(&[1u8, 1u8]);
-        let mut buf = PayloadHelper::new(once(Ok(buf.freeze())));
+        let mut buf = PayloadBuffer::new(once(Ok(buf.freeze())));
 
         assert!(Frame::parse(&mut buf, true, 1).is_err());
 
diff --git a/src/ws/mod.rs b/src/ws/mod.rs
index 05099971e..ed44e2708 100644
--- a/src/ws/mod.rs
+++ b/src/ws/mod.rs
@@ -52,7 +52,7 @@ use error::{Error, PayloadError, ResponseError};
 use httpmessage::HttpMessage;
 use httprequest::HttpRequest;
 use httpresponse::{ConnectionType, HttpResponse, HttpResponseBuilder};
-use payload::PayloadHelper;
+use payload::PayloadBuffer;
 
 mod client;
 mod context;
@@ -252,7 +252,7 @@ pub fn handshake<S>(
 
 /// Maps `Payload` stream into stream of `ws::Message` items
 pub struct WsStream<S> {
-    rx: PayloadHelper<S>,
+    rx: PayloadBuffer<S>,
     closed: bool,
     max_size: usize,
 }
@@ -264,7 +264,7 @@ where
     /// Create new websocket frames stream
     pub fn new(stream: S) -> WsStream<S> {
         WsStream {
-            rx: PayloadHelper::new(stream),
+            rx: PayloadBuffer::new(stream),
             closed: false,
             max_size: 65_536,
         }
diff --git a/tests/test_middleware.rs b/tests/test_middleware.rs
index 9c8ea85d8..4fa1c81da 100644
--- a/tests/test_middleware.rs
+++ b/tests/test_middleware.rs
@@ -997,7 +997,9 @@ fn test_resource_middleware_async_chain_with_error() {
 #[cfg(feature = "session")]
 #[test]
 fn test_session_storage_middleware() {
-    use actix_web::middleware::session::{RequestSession, SessionStorage, CookieSessionBackend};
+    use actix_web::middleware::session::{
+        CookieSessionBackend, RequestSession, SessionStorage,
+    };
 
     const SIMPLE_NAME: &'static str = "simple";
     const SIMPLE_PAYLOAD: &'static str = "kantan";
@@ -1008,7 +1010,9 @@ fn test_session_storage_middleware() {
 
     let mut srv = test::TestServer::with_factory(move || {
         App::new()
-            .middleware(SessionStorage::new(CookieSessionBackend::signed(&[0; 32]).secure(false)))
+            .middleware(SessionStorage::new(
+                CookieSessionBackend::signed(&[0; 32]).secure(false),
+            ))
             .resource("/index", move |r| {
                 r.f(|req| {
                     let res = req.session().set(COMPLEX_NAME, COMPLEX_PAYLOAD);
@@ -1029,9 +1033,10 @@ fn test_session_storage_middleware() {
 
                     HttpResponse::Ok()
                 })
-            }).resource("/expect_cookie", move |r| {
+            })
+            .resource("/expect_cookie", move |r| {
                 r.f(|req| {
-                    let cookies = req.cookies().expect("To get cookies");
+                    let _cookies = req.cookies().expect("To get cookies");
 
                     let value = req.session().get::<String>(SIMPLE_NAME);
                     assert!(value.is_ok());
@@ -1058,7 +1063,8 @@ fn test_session_storage_middleware() {
     assert!(set_cookie.is_some());
     let set_cookie = set_cookie.unwrap().to_str().expect("Convert to str");
 
-    let request = srv.get()
+    let request = srv
+        .get()
         .uri(srv.url("/expect_cookie"))
         .header("cookie", set_cookie.split(';').next().unwrap())
         .finish()