diff --git a/examples/autobahn-client.rs b/examples/autobahn-client.rs
index e053f5e..e5488b4 100644
--- a/examples/autobahn-client.rs
+++ b/examples/autobahn-client.rs
@@ -11,7 +11,8 @@ const AGENT: &'static str = "Tungstenite";
 
 fn get_case_count() -> Result<u32> {
     let (mut socket, _) = connect(
-        Url::parse("ws://localhost:9001/getCaseCount").unwrap()
+        Url::parse("ws://localhost:9001/getCaseCount").unwrap(),
+        None,
     )?;
     let msg = socket.read_message()?;
     socket.close(None)?;
@@ -20,7 +21,8 @@ fn get_case_count() -> Result<u32> {
 
 fn update_reports() -> Result<()> {
     let (mut socket, _) = connect(
-        Url::parse(&format!("ws://localhost:9001/updateReports?agent={}", AGENT)).unwrap()
+        Url::parse(&format!("ws://localhost:9001/updateReports?agent={}", AGENT)).unwrap(),
+        None,
     )?;
     socket.close(None)?;
     Ok(())
@@ -31,7 +33,7 @@ fn run_test(case: u32) -> Result<()> {
     let case_url = Url::parse(
         &format!("ws://localhost:9001/runCase?case={}&agent={}", case, AGENT)
     ).unwrap();
-    let (mut socket, _) = connect(case_url)?;
+    let (mut socket, _) = connect(case_url, None)?;
     loop {
         match socket.read_message()? {
             msg @ Message::Text(_) |
diff --git a/examples/autobahn-server.rs b/examples/autobahn-server.rs
index 10aba75..53b7d7a 100644
--- a/examples/autobahn-server.rs
+++ b/examples/autobahn-server.rs
@@ -16,7 +16,7 @@ fn must_not_block<Role: HandshakeRole>(err: HandshakeError<Role>) -> Error {
 }
 
 fn handle_client(stream: TcpStream) -> Result<()> {
-    let mut socket = accept(stream).map_err(must_not_block)?;
+    let mut socket = accept(stream, None).map_err(must_not_block)?;
     loop {
         match socket.read_message()? {
             msg @ Message::Text(_) |
diff --git a/examples/client.rs b/examples/client.rs
index 13b7d59..1ba7c71 100644
--- a/examples/client.rs
+++ b/examples/client.rs
@@ -8,7 +8,7 @@ use tungstenite::{Message, connect};
 fn main() {
     env_logger::init();
 
-    let (mut socket, response) = connect(Url::parse("ws://localhost:3012/socket").unwrap())
+    let (mut socket, response) = connect(Url::parse("ws://localhost:3012/socket").unwrap(), None)
         .expect("Can't connect");
 
     println!("Connected to the server");
diff --git a/examples/server.rs b/examples/server.rs
index 86df2fe..9649d6c 100644
--- a/examples/server.rs
+++ b/examples/server.rs
@@ -25,7 +25,7 @@ fn main() {
                 ];
                 Ok(Some(extra_headers))
             };
-            let mut websocket = accept_hdr(stream.unwrap(), callback).unwrap();
+            let mut websocket = accept_hdr(stream.unwrap(), callback, None).unwrap();
 
             loop {
                 let msg = websocket.read_message().unwrap();
diff --git a/src/client.rs b/src/client.rs
index 2326ac7..bb4d7f1 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -7,6 +7,7 @@ use std::io::{Read, Write};
 use url::Url;
 
 use handshake::client::Response;
+use protocol::WebSocketConfig;
 
 #[cfg(feature="tls")]
 mod encryption {
@@ -77,7 +78,7 @@ use error::{Error, Result};
 /// This function uses `native_tls` to do TLS. If you want to use other TLS libraries,
 /// use `client` instead. There is no need to enable the "tls" feature if you don't call
 /// `connect` since it's the only function that uses native_tls.
-pub fn connect<'t, Req: Into<Request<'t>>>(request: Req)
+pub fn connect<'t, Req: Into<Request<'t>>>(request: Req, config: Option<WebSocketConfig>)
     -> Result<(WebSocket<AutoStream>, Response)>
 {
     let request: Request = request.into();
@@ -85,7 +86,7 @@ pub fn connect<'t, Req: Into<Request<'t>>>(request: Req)
     let addrs = request.url.to_socket_addrs()?;
     let mut stream = connect_to_some(addrs, &request.url, mode)?;
     NoDelay::set_nodelay(&mut stream, true)?;
-    client(request, stream)
+    client(request, stream, config)
         .map_err(|e| match e {
             HandshakeError::Failure(f) => f,
             HandshakeError::Interrupted(_) => panic!("Bug: blocking handshake not blocked"),
@@ -126,11 +127,12 @@ pub fn url_mode(url: &Url) -> Result<Mode> {
 /// Any stream supporting `Read + Write` will do.
 pub fn client<'t, Stream, Req>(
     request: Req,
-    stream: Stream
-    ) -> StdResult<(WebSocket<Stream>, Response), HandshakeError<ClientHandshake<Stream>>>
+    stream: Stream,
+    config: Option<WebSocketConfig>,
+) -> StdResult<(WebSocket<Stream>, Response), HandshakeError<ClientHandshake<Stream>>>
 where
     Stream: Read + Write,
     Req: Into<Request<'t>>,
 {
-    ClientHandshake::start(stream, request.into()).handshake()
+    ClientHandshake::start(stream, request.into(), config).handshake()
 }
diff --git a/src/handshake/client.rs b/src/handshake/client.rs
index 00767c4..15494f9 100644
--- a/src/handshake/client.rs
+++ b/src/handshake/client.rs
@@ -11,7 +11,7 @@ use rand;
 use url::Url;
 
 use error::{Error, Result};
-use protocol::{WebSocket, Role};
+use protocol::{WebSocket, WebSocketConfig, Role};
 use super::headers::{Headers, FromHttparse, MAX_HEADERS};
 use super::machine::{HandshakeMachine, StageResult, TryParse};
 use super::{MidHandshake, HandshakeRole, ProcessingResult, convert_key};
@@ -71,12 +71,17 @@ impl From<Url> for Request<'static> {
 #[derive(Debug)]
 pub struct ClientHandshake<S> {
     verify_data: VerifyData,
+    config: Option<WebSocketConfig>,
     _marker: PhantomData<S>,
 }
 
 impl<S: Read + Write> ClientHandshake<S> {
     /// Initiate a client handshake.
-    pub fn start(stream: S, request: Request) -> MidHandshake<Self> {
+    pub fn start(
+        stream: S,
+        request: Request,
+        config: Option<WebSocketConfig>
+    ) -> MidHandshake<Self> {
         let key = generate_key();
 
         let machine = {
@@ -102,6 +107,7 @@ impl<S: Read + Write> ClientHandshake<S> {
             let accept_key = convert_key(key.as_ref()).unwrap();
             ClientHandshake {
                 verify_data: VerifyData { accept_key },
+                config,
                 _marker: PhantomData,
             }
         };
@@ -125,8 +131,13 @@ impl<S: Read + Write> HandshakeRole for ClientHandshake<S> {
             StageResult::DoneReading { stream, result, tail, } => {
                 self.verify_data.verify_response(&result)?;
                 debug!("Client handshake done.");
-                ProcessingResult::Done((WebSocket::from_partially_read(stream, tail, Role::Client),
-                                       result))
+                let websocket = WebSocket::from_partially_read(
+                    stream,
+                    tail,
+                    Role::Client,
+                    self.config.clone(),
+                );
+                ProcessingResult::Done((websocket, result))
             }
         })
     }
diff --git a/src/handshake/server.rs b/src/handshake/server.rs
index e88cd38..11a8ffb 100644
--- a/src/handshake/server.rs
+++ b/src/handshake/server.rs
@@ -8,7 +8,7 @@ use httparse;
 use httparse::Status;
 
 use error::{Error, Result};
-use protocol::{WebSocket, Role};
+use protocol::{WebSocket, WebSocketConfig, Role};
 use super::headers::{Headers, FromHttparse, MAX_HEADERS};
 use super::machine::{HandshakeMachine, StageResult, TryParse};
 use super::{MidHandshake, HandshakeRole, ProcessingResult, convert_key};
@@ -108,6 +108,8 @@ pub struct ServerHandshake<S, C> {
     /// to reply to it. The callback returns an optional headers which will be added to the reply
     /// which the server sends to the user.
     callback: Option<C>,
+    /// WebSocket configuration.
+    config: Option<WebSocketConfig>,
     /// Internal stream type.
     _marker: PhantomData<S>,
 }
@@ -117,11 +119,11 @@ impl<S: Read + Write, C: Callback> ServerHandshake<S, C> {
     /// the handshake, this callback will be called when the a websocket client connnects to the
     /// server, you can specify the callback if you want to add additional header to the client
     /// upon join based on the incoming headers.
-    pub fn start(stream: S, callback: C) -> MidHandshake<Self> {
+    pub fn start(stream: S, callback: C, config: Option<WebSocketConfig>) -> MidHandshake<Self> {
         trace!("Server handshake initiated.");
         MidHandshake {
             machine: HandshakeMachine::start_read(stream),
-            role: ServerHandshake { callback: Some(callback), _marker: PhantomData },
+            role: ServerHandshake { callback: Some(callback), config, _marker: PhantomData },
         }
     }
 }
@@ -151,7 +153,12 @@ impl<S: Read + Write, C: Callback> HandshakeRole for ServerHandshake<S, C> {
             }
             StageResult::DoneWriting(stream) => {
                 debug!("Server handshake done.");
-                ProcessingResult::Done(WebSocket::from_raw_socket(stream, Role::Server))
+                let websocket = WebSocket::from_raw_socket(
+                    stream,
+                    Role::Server,
+                    self.config.clone(),
+                );
+                ProcessingResult::Done(websocket)
             }
         })
     }
diff --git a/src/protocol/mod.rs b/src/protocol/mod.rs
index a7ea9b2..adfe000 100644
--- a/src/protocol/mod.rs
+++ b/src/protocol/mod.rs
@@ -26,6 +26,23 @@ pub enum Role {
     Client,
 }
 
+/// The configuration for WebSocket connection.
+#[derive(Debug, Clone, Copy)]
+pub struct WebSocketConfig {
+    /// The size of the send queue. You can use it to turn on/off the backpressure features. `None`
+    /// means here that the size of the queue is unlimited. The default value is the unlimited
+    /// queue.
+    pub max_send_queue: Option<usize>,
+}
+
+impl Default for WebSocketConfig {
+    fn default() -> Self {
+        WebSocketConfig {
+            max_send_queue: None,
+        }
+    }
+}
+
 /// WebSocket input-output stream.
 ///
 /// This is THE structure you want to create to be able to speak the WebSocket protocol.
@@ -42,20 +59,26 @@ pub struct WebSocket<Stream> {
     incomplete: Option<IncompleteMessage>,
     /// Send: a data send queue.
     send_queue: VecDeque<Frame>,
-    max_send_queue: usize,
     /// Send: an OOB pong message.
     pong: Option<Frame>,
+    /// The configuration for the websocket session.
+    config: WebSocketConfig,
 }
 
 impl<Stream> WebSocket<Stream> {
     /// Convert a raw socket into a WebSocket without performing a handshake.
-    pub fn from_raw_socket(stream: Stream, role: Role) -> Self {
-        WebSocket::from_frame_socket(FrameSocket::new(stream), role)
+    pub fn from_raw_socket(stream: Stream, role: Role, config: Option<WebSocketConfig>) -> Self {
+        WebSocket::from_frame_socket(FrameSocket::new(stream), role, config)
     }
 
     /// Convert a raw socket into a WebSocket without performing a handshake.
-    pub fn from_partially_read(stream: Stream, part: Vec<u8>, role: Role) -> Self {
-        WebSocket::from_frame_socket(FrameSocket::from_partially_read(stream, part), role)
+    pub fn from_partially_read(
+        stream: Stream,
+        part: Vec<u8>,
+        role: Role,
+        config: Option<WebSocketConfig>,
+    ) -> Self {
+        WebSocket::from_frame_socket(FrameSocket::from_partially_read(stream, part), role, config)
     }
 
     /// Returns a shared reference to the inner stream.
@@ -68,15 +91,19 @@ impl<Stream> WebSocket<Stream> {
     }
 
     /// Convert a frame socket into a WebSocket.
-    fn from_frame_socket(socket: FrameSocket<Stream>, role: Role) -> Self {
+    fn from_frame_socket(
+        socket: FrameSocket<Stream>,
+        role: Role,
+        config: Option<WebSocketConfig>
+    ) -> Self {
         WebSocket {
             role: role,
             socket: socket,
             state: WebSocketState::Active,
             incomplete: None,
             send_queue: VecDeque::new(),
-            max_send_queue: 1,
             pong: None,
+            config: config.unwrap_or_else(|| WebSocketConfig::default()),
         }
     }
 }
@@ -104,7 +131,7 @@ impl<Stream: Read + Write> WebSocket<Stream> {
     /// Send a message to stream, if possible.
     ///
     /// WebSocket will buffer a configurable number of messages at a time, except to reply to Ping
-    /// and Close requests. If the WebSocket's send queue is full, SendQueueFull will be returned
+    /// and Close requests. If the WebSocket's send queue is full, `SendQueueFull` will be returned
     /// along with the passed message. Otherwise, the message is queued and Ok(()) is returned.
     ///
     /// Note that only the last pong frame is stored to be sent, and only the
@@ -113,8 +140,10 @@ impl<Stream: Read + Write> WebSocket<Stream> {
         // Try to make some room for the new message
         self.write_pending().no_block()?;
 
-        if self.send_queue.len() >= self.max_send_queue {
-            return Err(Error::SendQueueFull(message));
+        if let Some(max_send_queue) = self.config.max_send_queue {
+            if self.send_queue.len() >= max_send_queue {
+                return Err(Error::SendQueueFull(message));
+            }
         }
 
         let frame = match message {
@@ -466,7 +495,7 @@ mod tests {
             0x82, 0x03,
             0x01, 0x02, 0x03,
         ]);
-        let mut socket = WebSocket::from_raw_socket(WriteMoc(incoming), Role::Client);
+        let mut socket = WebSocket::from_raw_socket(WriteMoc(incoming), Role::Client, None);
         assert_eq!(socket.read_message().unwrap(), Message::Ping(vec![1, 2]));
         assert_eq!(socket.read_message().unwrap(), Message::Pong(vec![3]));
         assert_eq!(socket.read_message().unwrap(), Message::Text("Hello, World!".into()));
diff --git a/src/server.rs b/src/server.rs
index 68e026f..d737565 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -5,7 +5,7 @@ pub use handshake::server::ServerHandshake;
 use handshake::HandshakeError;
 use handshake::server::{Callback, NoCallback};
 
-use protocol::WebSocket;
+use protocol::{WebSocket, WebSocketConfig};
 
 use std::io::{Read, Write};
 
@@ -15,10 +15,10 @@ use std::io::{Read, Write};
 /// If you want TLS support, use `native_tls::TlsStream` or `openssl::ssl::SslStream`
 /// for the stream here. Any `Read + Write` streams are supported, including
 /// those from `Mio` and others.
-pub fn accept<S: Read + Write>(stream: S)
+pub fn accept<S: Read + Write>(stream: S, config: Option<WebSocketConfig>)
     -> Result<WebSocket<S>, HandshakeError<ServerHandshake<S, NoCallback>>>
 {
-    accept_hdr(stream, NoCallback)
+    accept_hdr(stream, NoCallback, config)
 }
 
 /// Accept the given Stream as a WebSocket.
@@ -26,8 +26,10 @@ pub fn accept<S: Read + Write>(stream: S)
 /// This function does the same as `accept()` but accepts an extra callback
 /// for header processing. The callback receives headers of the incoming
 /// requests and is able to add extra headers to the reply.
-pub fn accept_hdr<S: Read + Write, C: Callback>(stream: S, callback: C)
-    -> Result<WebSocket<S>, HandshakeError<ServerHandshake<S, C>>>
-{
-    ServerHandshake::start(stream, callback).handshake()
+pub fn accept_hdr<S: Read + Write, C: Callback>(
+    stream: S,
+    callback: C,
+    config: Option<WebSocketConfig>
+) -> Result<WebSocket<S>, HandshakeError<ServerHandshake<S, C>>> {
+    ServerHandshake::start(stream, callback, config).handshake()
 }