diff --git a/Cargo.toml b/Cargo.toml
index 6569d79..ac93fdc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ edition = "2018"
 default = ["tls"]
 tls = ["native-tls"]
 tls-vendored = ["native-tls", "native-tls/vendored"]
-deflate = ["flate2"]
+deflate = []
 
 [dependencies]
 base64 = "0.12.0"
@@ -30,12 +30,7 @@ rand = "0.7.2"
 sha-1 = "0.9"
 url = "2.1.0"
 utf-8 = "0.7.5"
-
-[dependencies.flate2]
-optional = true
-default-features = false
-version = "1.0"
-features = ["zlib"]
+flate2 = { version = "1.0", features = ["zlib"], default-features = false }
 
 [dependencies.native-tls]
 optional = true
diff --git a/README.md b/README.md
index a0351db..5374cfe 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,7 @@ Features
 Tungstenite provides a complete implementation of the WebSocket specification.
 TLS is supported on all platforms using native-tls.
 
-There is no support for permessage-deflate at the moment. It's planned.
+Permessage-deflate.
 
 Testing
 -------
diff --git a/examples/autobahn-client.rs b/examples/autobahn-client.rs
index 1b4ee94..523056d 100644
--- a/examples/autobahn-client.rs
+++ b/examples/autobahn-client.rs
@@ -3,17 +3,13 @@ use url::Url;
 
 use tungstenite::client::connect_with_config;
 use tungstenite::extensions::deflate::DeflateExt;
-use tungstenite::extensions::uncompressed::PlainTextExt;
 use tungstenite::protocol::WebSocketConfig;
-use tungstenite::{connect, Error, Message, Result, WebSocket};
+use tungstenite::{connect, Error, Message, Result};
 
 const AGENT: &str = "Tungstenite";
 
 fn get_case_count() -> Result<u32> {
-    let (mut socket, _): (WebSocket<_, PlainTextExt>, _) = connect_with_config(
-        Url::parse("ws://localhost:9001/getCaseCount").unwrap(),
-        None,
-    )?;
+    let (mut socket, _) = connect(Url::parse("ws://localhost:9001/getCaseCount").unwrap())?;
     let msg = socket.read_message()?;
     socket.close(None)?;
     Ok(msg.into_text()?.parse::<u32>().unwrap())
diff --git a/fuzz/fuzz_targets/read_message_client.rs b/fuzz/fuzz_targets/read_message_client.rs
index affdb3e..1c0708b 100644
--- a/fuzz/fuzz_targets/read_message_client.rs
+++ b/fuzz/fuzz_targets/read_message_client.rs
@@ -1,12 +1,11 @@
 #![no_main]
-#[macro_use]
-extern crate libfuzzer_sys;
+#[macro_use] extern crate libfuzzer_sys;
 extern crate tungstenite;
 
 use std::io;
 use std::io::Cursor;
-use tungstenite::protocol::Role;
 use tungstenite::WebSocket;
+use tungstenite::protocol::Role;
 //use std::result::Result;
 
 // FIXME: copypasted from tungstenite's protocol/mod.rs
diff --git a/scripts/autobahn-client.sh b/scripts/autobahn-client.sh
old mode 100644
new mode 100755
diff --git a/scripts/autobahn-server.sh b/scripts/autobahn-server.sh
old mode 100644
new mode 100755
diff --git a/src/client.rs b/src/client.rs
index 25416cb..3911342 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -66,7 +66,7 @@ use self::encryption::wrap_stream;
 pub use self::encryption::AutoStream;
 
 use crate::error::{Error, Result};
-use crate::extensions::uncompressed::PlainTextExt;
+use crate::extensions::uncompressed::UncompressedExt;
 use crate::extensions::WebSocketExtension;
 use crate::handshake::client::ClientHandshake;
 use crate::handshake::HandshakeError;
@@ -88,12 +88,13 @@ use crate::stream::{Mode, NoDelay};
 /// 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_with_config<Req: IntoClientRequest, E>(
+pub fn connect_with_config<Req, Ext>(
     request: Req,
-    config: Option<WebSocketConfig<E>>,
-) -> Result<(WebSocket<AutoStream, E>, Response)>
+    config: Option<WebSocketConfig<Ext>>,
+) -> Result<(WebSocket<AutoStream, Ext>, Response)>
 where
-    E: WebSocketExtension,
+    Req: IntoClientRequest,
+    Ext: WebSocketExtension,
 {
     let request: Request = request.into_client_request()?;
     let uri = request.uri();
@@ -129,7 +130,7 @@ where
 /// `connect` since it's the only function that uses native_tls.
 pub fn connect<Req: IntoClientRequest>(
     request: Req,
-) -> Result<(WebSocket<AutoStream, PlainTextExt>, Response)> {
+) -> Result<(WebSocket<AutoStream, UncompressedExt>, Response)> {
     connect_with_config(request, None)
 }
 
@@ -166,15 +167,15 @@ pub fn uri_mode(uri: &Uri) -> Result<Mode> {
 /// Use this function if you need a nonblocking handshake support or if you
 /// want to use a custom stream like `mio::tcp::TcpStream` or `openssl::ssl::SslStream`.
 /// Any stream supporting `Read + Write` will do.
-pub fn client_with_config<Stream, Req, E>(
+pub fn client_with_config<Stream, Req, Ext>(
     request: Req,
     stream: Stream,
-    config: Option<WebSocketConfig<E>>,
-) -> StdResult<(WebSocket<Stream, E>, Response), HandshakeError<ClientHandshake<Stream, E>>>
+    config: Option<WebSocketConfig<Ext>>,
+) -> StdResult<(WebSocket<Stream, Ext>, Response), HandshakeError<ClientHandshake<Stream, Ext>>>
 where
     Stream: Read + Write,
     Req: IntoClientRequest,
-    E: WebSocketExtension,
+    Ext: WebSocketExtension,
 {
     ClientHandshake::start(stream, request.into_client_request()?, config)?.handshake()
 }
@@ -188,8 +189,8 @@ pub fn client<Stream, Req>(
     request: Req,
     stream: Stream,
 ) -> StdResult<
-    (WebSocket<Stream, PlainTextExt>, Response),
-    HandshakeError<ClientHandshake<Stream, PlainTextExt>>,
+    (WebSocket<Stream, UncompressedExt>, Response),
+    HandshakeError<ClientHandshake<Stream, UncompressedExt>>,
 >
 where
     Stream: Read + Write,
diff --git a/src/error.rs b/src/error.rs
index 9915787..547a931 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -68,7 +68,7 @@ pub enum Error {
     /// HTTP format error.
     HttpFormat(http::Error),
     /// An error from a WebSocket extension.
-    ExtensionError(Box<dyn std::error::Error + Send + Sync>),
+    ExtensionError(Cow<'static, str>),
 }
 
 impl fmt::Display for Error {
diff --git a/src/extensions/deflate.rs b/src/extensions/deflate.rs
index b172e78..fe1f7d9 100644
--- a/src/extensions/deflate.rs
+++ b/src/extensions/deflate.rs
@@ -2,7 +2,7 @@
 
 use std::fmt::{Display, Formatter};
 
-use crate::extensions::uncompressed::PlainTextExt;
+use crate::extensions::uncompressed::UncompressedExt;
 use crate::extensions::WebSocketExtension;
 use crate::protocol::frame::coding::{Data, OpCode};
 use crate::protocol::frame::Frame;
@@ -15,10 +15,20 @@ use flate2::{
 };
 use http::header::{InvalidHeaderValue, SEC_WEBSOCKET_EXTENSIONS};
 use http::{HeaderValue, Request, Response};
+use std::borrow::Cow;
 use std::mem::replace;
 use std::slice;
 
-const EXT_NAME: &str = "permessage-deflate";
+/// The WebSocket Extension Identifier as per the IANA registry.
+const EXT_IDENT: &str = "permessage-deflate";
+
+/// The minimum size of the LZ77 sliding window size.
+const LZ77_MIN_WINDOW_SIZE: u8 = 9;
+
+/// The maximum size of the LZ77 sliding window size. Absence of the `max_window_bits` parameter
+/// indicates that the client can receive messages compressed using an LZ77 sliding window of up to
+/// 32,768 bytes. RFC 7692 7.1.2.1.
+const LZ77_MAX_WINDOW_SIZE: u8 = 15;
 
 /// A permessage-deflate configuration.
 #[derive(Clone, Copy, Debug)]
@@ -33,9 +43,14 @@ pub struct DeflateConfig {
     max_window_bits: u8,
     /// Request that the server resets the LZ77 sliding window between messages - RFC 7692 7.1.1.1.
     request_no_context_takeover: bool,
+    /// Whether to accept `no_context_takeover`.
     accept_no_context_takeover: bool,
+    // Whether the compressor should be reset after usage.
     compress_reset: bool,
+    // Whether the decompressor should be reset after usage.
     decompress_reset: bool,
+    /// The active compression level. The integer here is typically on a scale of 0-9 where 0 means
+    /// "no compression" and 9 means "take as long as you'd like".
     compression_level: Compression,
 }
 
@@ -91,7 +106,7 @@ impl DeflateConfig {
 
     /// Sets the LZ77 sliding window size.
     pub fn set_max_window_bits(&mut self, max_window_bits: u8) {
-        assert!((9u8..=15u8).contains(&max_window_bits));
+        assert!((LZ77_MIN_WINDOW_SIZE..=LZ77_MAX_WINDOW_SIZE).contains(&max_window_bits));
         self.max_window_bits = max_window_bits;
     }
 
@@ -110,7 +125,7 @@ impl Default for DeflateConfig {
     fn default() -> Self {
         DeflateConfig {
             max_message_size: Some(MAX_MESSAGE_SIZE),
-            max_window_bits: 15,
+            max_window_bits: LZ77_MAX_WINDOW_SIZE,
             request_no_context_takeover: false,
             accept_no_context_takeover: true,
             compress_reset: false,
@@ -135,7 +150,7 @@ impl Default for DeflateConfigBuilder {
     fn default() -> Self {
         DeflateConfigBuilder {
             max_message_size: Some(MAX_MESSAGE_SIZE),
-            max_window_bits: 15,
+            max_window_bits: LZ77_MAX_WINDOW_SIZE,
             request_no_context_takeover: false,
             accept_no_context_takeover: true,
             fragments_grow: true,
@@ -154,7 +169,7 @@ impl DeflateConfigBuilder {
     /// Sets the LZ77 sliding window size. Panics if the provided size is not in `9..=15`.
     pub fn max_window_bits(mut self, max_window_bits: u8) -> DeflateConfigBuilder {
         assert!(
-            (9u8..=15u8).contains(&max_window_bits),
+            (LZ77_MIN_WINDOW_SIZE..=LZ77_MAX_WINDOW_SIZE).contains(&max_window_bits),
             "max window bits must be in range 9..=15"
         );
         self.max_window_bits = max_window_bits;
@@ -207,26 +222,7 @@ pub struct DeflateExt {
     /// The deflate compressor.
     deflator: Deflator,
     /// If this deflate extension is not used, messages will be forwarded to this extension.
-    uncompressed_extension: PlainTextExt,
-}
-
-impl Clone for DeflateExt {
-    fn clone(&self) -> Self {
-        DeflateExt {
-            enabled: self.enabled,
-            config: self.config,
-            fragments: vec![],
-            inflator: Inflator::new(),
-            deflator: Deflator::new(self.config.compression_level()),
-            uncompressed_extension: PlainTextExt::new(self.config.max_message_size()),
-        }
-    }
-}
-
-impl Default for DeflateExt {
-    fn default() -> Self {
-        DeflateExt::new(Default::default())
-    }
+    uncompressed_extension: UncompressedExt,
 }
 
 impl DeflateExt {
@@ -238,7 +234,7 @@ impl DeflateExt {
             fragments: vec![],
             inflator: Inflator::new(),
             deflator: Deflator::new(Compression::fast()),
-            uncompressed_extension: PlainTextExt::new(config.max_message_size()),
+            uncompressed_extension: UncompressedExt::new(config.max_message_size()),
         }
     }
 
@@ -262,10 +258,10 @@ impl DeflateExt {
             match window_bits_str.trim().parse() {
                 Ok(mut window_bits) => {
                     if window_bits == 8 {
-                        window_bits = 9;
+                        window_bits = LZ77_MIN_WINDOW_SIZE;
                     }
 
-                    if window_bits >= 9 && window_bits <= 15 {
+                    if window_bits >= LZ77_MIN_WINDOW_SIZE && window_bits <= LZ77_MAX_WINDOW_SIZE {
                         if window_bits != self.config.max_window_bits() {
                             Ok(Some(window_bits))
                         } else {
@@ -284,7 +280,7 @@ impl DeflateExt {
 
     fn decline<T>(&mut self, res: &mut Response<T>) {
         self.enabled = false;
-        res.headers_mut().remove(EXT_NAME);
+        res.headers_mut().remove(EXT_IDENT);
     }
 }
 
@@ -319,7 +315,7 @@ impl std::error::Error for DeflateExtensionError {}
 
 impl From<DeflateExtensionError> for crate::Error {
     fn from(e: DeflateExtensionError) -> Self {
-        crate::Error::ExtensionError(Box::new(e))
+        crate::Error::ExtensionError(Cow::from(e.to_string()))
     }
 }
 
@@ -329,6 +325,12 @@ impl From<InvalidHeaderValue> for DeflateExtensionError {
     }
 }
 
+impl Default for DeflateExt {
+    fn default() -> Self {
+        DeflateExt::new(Default::default())
+    }
+}
+
 impl WebSocketExtension for DeflateExt {
     type Error = DeflateExtensionError;
 
@@ -344,14 +346,14 @@ impl WebSocketExtension for DeflateExt {
     }
 
     fn on_make_request<T>(&mut self, mut request: Request<T>) -> Request<T> {
-        let mut header_value = String::from(EXT_NAME);
+        let mut header_value = String::from(EXT_IDENT);
         let DeflateConfig {
             max_window_bits,
             request_no_context_takeover,
             ..
         } = self.config;
 
-        if max_window_bits < 15 {
+        if max_window_bits < LZ77_MAX_WINDOW_SIZE {
             header_value.push_str(&format!(
                 "; client_max_window_bits={}; server_max_window_bits={}",
                 max_window_bits, max_window_bits
@@ -486,7 +488,7 @@ impl WebSocketExtension for DeflateExt {
                     }
 
                     if !response_str.contains("client_max_window_bits")
-                        && self.config.max_window_bits() < 15
+                        && self.config.max_window_bits() < LZ77_MAX_WINDOW_SIZE
                     {
                         continue;
                     }
@@ -671,7 +673,7 @@ impl WebSocketExtension for DeflateExt {
                 if self.enabled && (!self.fragments.is_empty() || frame.header().rsv1) {
                     if !frame.header().is_final {
                         self.fragments.push(frame);
-                        return Ok(None);
+                        Ok(None)
                     } else {
                         let message = if let OpCode::Data(Data::Continue) = frame.header().opcode {
                             self.fragments.push(frame);
diff --git a/src/extensions/mod.rs b/src/extensions/mod.rs
index d8207de..0e56bea 100644
--- a/src/extensions/mod.rs
+++ b/src/extensions/mod.rs
@@ -13,7 +13,7 @@ pub mod uncompressed;
 
 /// A trait for defining WebSocket extensions. Extensions may be stacked by nesting them inside
 /// one another.
-pub trait WebSocketExtension: Default + Clone {
+pub trait WebSocketExtension {
     /// An error type that the extension produces.
     type Error: Into<crate::Error>;
 
diff --git a/src/extensions/uncompressed.rs b/src/extensions/uncompressed.rs
index c4f4643..ec5919b 100644
--- a/src/extensions/uncompressed.rs
+++ b/src/extensions/uncompressed.rs
@@ -2,47 +2,31 @@ use crate::extensions::WebSocketExtension;
 use crate::protocol::frame::coding::{Data, OpCode};
 use crate::protocol::frame::Frame;
 use crate::protocol::message::{IncompleteMessage, IncompleteMessageType};
-use crate::protocol::MAX_MESSAGE_SIZE;
 use crate::{Error, Message};
 
 /// An uncompressed message handler for a WebSocket.
 #[derive(Debug)]
-pub struct PlainTextExt {
+pub struct UncompressedExt {
     incomplete: Option<IncompleteMessage>,
     max_message_size: Option<usize>,
 }
 
-impl PlainTextExt {
-    /// Builds a new `PlainTextExt` that will permit a maximum message size of `max_message_size`
+impl UncompressedExt {
+    /// Builds a new `UncompressedExt` that will permit a maximum message size of `max_message_size`
     /// or will be unbounded if `None`.
-    pub fn new(max_message_size: Option<usize>) -> PlainTextExt {
-        PlainTextExt {
+    pub fn new(max_message_size: Option<usize>) -> UncompressedExt {
+        UncompressedExt {
             incomplete: None,
             max_message_size,
         }
     }
 }
 
-impl Clone for PlainTextExt {
-    fn clone(&self) -> Self {
-        Self::default()
-    }
-}
-
-impl Default for PlainTextExt {
-    fn default() -> Self {
-        PlainTextExt {
-            incomplete: None,
-            max_message_size: Some(MAX_MESSAGE_SIZE),
-        }
-    }
-}
-
-impl WebSocketExtension for PlainTextExt {
+impl WebSocketExtension for UncompressedExt {
     type Error = Error;
 
     fn new(max_message_size: Option<usize>) -> Self {
-        PlainTextExt {
+        UncompressedExt {
             incomplete: None,
             max_message_size,
         }
diff --git a/src/handshake/client.rs b/src/handshake/client.rs
index 9e1dffd..d8c84d7 100644
--- a/src/handshake/client.rs
+++ b/src/handshake/client.rs
@@ -22,24 +22,25 @@ pub type Response = HttpResponse<()>;
 
 /// Client handshake role.
 #[derive(Debug)]
-pub struct ClientHandshake<S, E>
+pub struct ClientHandshake<S, Extension>
 where
-    E: WebSocketExtension,
+    Extension: WebSocketExtension,
 {
     verify_data: VerifyData,
-    config: Option<WebSocketConfig<E>>,
+    config: Option<Option<WebSocketConfig<Extension>>>,
     _marker: PhantomData<S>,
 }
 
-impl<S: Read + Write, E> ClientHandshake<S, E>
+impl<Stream, Ext> ClientHandshake<Stream, Ext>
 where
-    E: WebSocketExtension,
+    Stream: Read + Write,
+    Ext: WebSocketExtension,
 {
     /// Initiate a client handshake.
     pub fn start(
-        stream: S,
+        stream: Stream,
         request: Request,
-        mut config: Option<WebSocketConfig<E>>,
+        mut config: Option<WebSocketConfig<Ext>>,
     ) -> Result<MidHandshake<Self>> {
         if request.method() != http::Method::GET {
             return Err(Error::Protocol(
@@ -67,7 +68,7 @@ where
             let accept_key = convert_key(key.as_ref()).unwrap();
             ClientHandshake {
                 verify_data: VerifyData { accept_key },
-                config,
+                config: Some(config),
                 _marker: PhantomData,
             }
         };
@@ -80,13 +81,14 @@ where
     }
 }
 
-impl<S: Read + Write, E> HandshakeRole for ClientHandshake<S, E>
+impl<Stream, Ext> HandshakeRole for ClientHandshake<Stream, Ext>
 where
-    E: WebSocketExtension,
+    Stream: Read + Write,
+    Ext: WebSocketExtension,
 {
     type IncomingData = Response;
-    type InternalStream = S;
-    type FinalResult = (WebSocket<S, E>, Response);
+    type InternalStream = Stream;
+    type FinalResult = (WebSocket<Stream, Ext>, Response);
 
     fn stage_finished(
         &mut self,
@@ -101,11 +103,11 @@ where
                 result,
                 tail,
             } => {
-                self.verify_data
-                    .verify_response(&result, &mut self.config)?;
+                let mut config = self.config.take().unwrap();
+
+                self.verify_data.verify_response(&result, &mut config)?;
                 debug!("Client handshake done.");
-                let websocket =
-                    WebSocket::from_partially_read(stream, tail, Role::Client, self.config.clone());
+                let websocket = WebSocket::from_partially_read(stream, tail, Role::Client, config);
                 ProcessingResult::Done((websocket, result))
             }
         })
@@ -113,13 +115,13 @@ where
 }
 
 /// Generate client request.
-fn generate_request<E>(
+fn generate_request<Ext>(
     request: Request,
     key: &str,
-    config: &mut Option<WebSocketConfig<E>>,
+    config: &mut Option<WebSocketConfig<Ext>>,
 ) -> Result<Vec<u8>>
 where
-    E: WebSocketExtension,
+    Ext: WebSocketExtension,
 {
     let request = match config {
         Some(ref mut config) => config.encoder.on_make_request(request),
@@ -181,13 +183,13 @@ struct VerifyData {
 }
 
 impl VerifyData {
-    pub fn verify_response<E>(
+    pub fn verify_response<Ext>(
         &self,
         response: &Response,
-        config: &mut Option<WebSocketConfig<E>>,
+        config: &mut Option<WebSocketConfig<Ext>>,
     ) -> Result<()>
     where
-        E: WebSocketExtension,
+        Ext: WebSocketExtension,
     {
         // 1. If the status code received from the server is not 101, the
         // client handles the response per HTTP [RFC2616] procedures. (RFC 6455)
@@ -306,7 +308,7 @@ mod tests {
     use super::super::machine::TryParse;
     use super::{generate_key, generate_request, Response};
     use crate::client::IntoClientRequest;
-    use crate::extensions::uncompressed::PlainTextExt;
+    use crate::extensions::uncompressed::UncompressedExt;
 
     #[test]
     fn random_keys() {
@@ -337,7 +339,8 @@ mod tests {
             Sec-WebSocket-Key: A70tsIbeMZUbJHh5BWFw6Q==\r\n\
             \r\n";
         let request =
-            generate_request::<PlainTextExt>(request, key, &mut Some(Default::default())).unwrap();
+            generate_request::<UncompressedExt>(request, key, &mut Some(Default::default()))
+                .unwrap();
         println!("Request: {}", String::from_utf8_lossy(&request));
         assert_eq!(&request[..], &correct[..]);
     }
@@ -357,7 +360,8 @@ mod tests {
             Sec-WebSocket-Key: A70tsIbeMZUbJHh5BWFw6Q==\r\n\
             \r\n";
         let request =
-            generate_request::<PlainTextExt>(request, key, &mut Some(Default::default())).unwrap();
+            generate_request::<UncompressedExt>(request, key, &mut Some(Default::default()))
+                .unwrap();
         println!("Request: {}", String::from_utf8_lossy(&request));
         assert_eq!(&request[..], &correct[..]);
     }
@@ -377,7 +381,8 @@ mod tests {
             Sec-WebSocket-Key: A70tsIbeMZUbJHh5BWFw6Q==\r\n\
             \r\n";
         let request =
-            generate_request::<PlainTextExt>(request, key, &mut Some(Default::default())).unwrap();
+            generate_request::<UncompressedExt>(request, key, &mut Some(Default::default()))
+                .unwrap();
         println!("Request: {}", String::from_utf8_lossy(&request));
         assert_eq!(&request[..], &correct[..]);
     }
diff --git a/src/handshake/server.rs b/src/handshake/server.rs
index 21b4de4..c04755a 100644
--- a/src/handshake/server.rs
+++ b/src/handshake/server.rs
@@ -93,10 +93,9 @@ pub fn create_response(request: &Request) -> Result<Response> {
 fn write_response<T>(w: &mut dyn io::Write, response: &HttpResponse<T>) -> Result<()> {
     writeln!(
         w,
-        "{version:?} {status} {reason}\r",
+        "{version:?} {status}\r",
         version = response.version(),
-        status = response.status(),
-        reason = response.status().canonical_reason().unwrap_or(""),
+        status = response.status()
     )?;
 
     for (k, v) in response.headers() {
@@ -192,37 +191,43 @@ impl Callback for NoCallback {
 /// Server handshake role.
 #[allow(missing_copy_implementations)]
 #[derive(Debug)]
-pub struct ServerHandshake<S, C, E>
+pub struct ServerHandshake<S, C, Ext>
 where
-    E: WebSocketExtension,
+    Ext: WebSocketExtension,
 {
     /// Callback which is called whenever the server read the request from the client and is ready
     /// 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<E>>,
+    config: Option<Option<WebSocketConfig<Ext>>>,
     /// Error code/flag. If set, an error will be returned after sending response to the client.
     error_code: Option<u16>,
     /// Internal stream type.
     _marker: PhantomData<S>,
 }
 
-impl<S: Read + Write, C: Callback, E> ServerHandshake<S, C, E>
+impl<S, C, Ext> ServerHandshake<S, C, Ext>
 where
-    E: WebSocketExtension,
+    S: Read + Write,
+    C: Callback,
+    Ext: WebSocketExtension,
 {
     /// Start server handshake. `callback` specifies a custom callback which the user can pass to
     /// 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, config: Option<WebSocketConfig<E>>) -> MidHandshake<Self> {
+    pub fn start(
+        stream: S,
+        callback: C,
+        config: Option<WebSocketConfig<Ext>>,
+    ) -> MidHandshake<Self> {
         trace!("Server handshake initiated.");
         MidHandshake {
             machine: HandshakeMachine::start_read(stream),
             role: ServerHandshake {
                 callback: Some(callback),
-                config,
+                config: Some(config),
                 error_code: None,
                 _marker: PhantomData,
             },
@@ -230,13 +235,15 @@ where
     }
 }
 
-impl<S: Read + Write, C: Callback, E> HandshakeRole for ServerHandshake<S, C, E>
+impl<S, C, Ext> HandshakeRole for ServerHandshake<S, C, Ext>
 where
-    E: WebSocketExtension,
+    S: Read + Write,
+    C: Callback,
+    Ext: WebSocketExtension,
 {
     type IncomingData = Request;
     type InternalStream = S;
-    type FinalResult = WebSocket<S, E>;
+    type FinalResult = WebSocket<S, Ext>;
 
     fn stage_finished(
         &mut self,
@@ -254,7 +261,7 @@ where
 
                 let mut response = create_response(&request)?;
 
-                if let Some(ref mut config) = self.config {
+                if let Some(ref mut config) = self.config.as_mut().unwrap() {
                     if let Err(e) = config.encoder.on_receive_request(&request, &mut response) {
                         return Err(e.into());
                     }
@@ -298,8 +305,11 @@ where
                     return Err(Error::Http(StatusCode::from_u16(err)?));
                 } else {
                     debug!("Server handshake done.");
-                    let websocket =
-                        WebSocket::from_raw_socket(stream, Role::Server, self.config.clone());
+                    let websocket = WebSocket::from_raw_socket(
+                        stream,
+                        Role::Server,
+                        self.config.take().unwrap(),
+                    );
                     ProcessingResult::Done(websocket)
                 }
             }
diff --git a/src/protocol/mod.rs b/src/protocol/mod.rs
index e95207f..28c3a43 100644
--- a/src/protocol/mod.rs
+++ b/src/protocol/mod.rs
@@ -16,7 +16,7 @@ use self::frame::coding::{CloseCode, Control as OpCtl, Data as OpData, OpCode};
 use self::frame::{Frame, FrameCodec};
 use self::message::IncompleteMessage;
 use crate::error::{Error, Result};
-use crate::extensions::uncompressed::PlainTextExt;
+use crate::extensions::uncompressed::UncompressedExt;
 use crate::extensions::WebSocketExtension;
 use crate::util::NonBlockingResult;
 
@@ -33,7 +33,7 @@ pub enum Role {
 
 /// The configuration for WebSocket connection.
 #[derive(Debug, Copy, Clone)]
-pub struct WebSocketConfig<E = PlainTextExt>
+pub struct WebSocketConfig<E = UncompressedExt>
 where
     E: WebSocketExtension,
 {
@@ -83,26 +83,30 @@ where
 /// This is THE structure you want to create to be able to speak the WebSocket protocol.
 /// It may be created by calling `connect`, `accept` or `client` functions.
 #[derive(Debug)]
-pub struct WebSocket<Stream, E>
+pub struct WebSocket<Stream, Ext>
 where
-    E: WebSocketExtension,
+    Ext: WebSocketExtension,
 {
     /// The underlying socket.
     socket: Stream,
     /// The context for managing a WebSocket.
-    context: WebSocketContext<E>,
+    context: WebSocketContext<Ext>,
 }
 
-impl<Stream, E> WebSocket<Stream, E>
+impl<Stream, Ext> WebSocket<Stream, Ext>
 where
-    E: WebSocketExtension,
+    Ext: WebSocketExtension,
 {
     /// Convert a raw socket into a WebSocket without performing a handshake.
     ///
     /// Call this function if you're using Tungstenite as a part of a web framework
     /// or together with an existing one. If you need an initial handshake, use
     /// `connect()` or `accept()` functions of the crate to construct a websocket.
-    pub fn from_raw_socket(stream: Stream, role: Role, config: Option<WebSocketConfig<E>>) -> Self {
+    pub fn from_raw_socket(
+        stream: Stream,
+        role: Role,
+        config: Option<WebSocketConfig<Ext>>,
+    ) -> Self {
         WebSocket {
             socket: stream,
             context: WebSocketContext::new(role, config),
@@ -118,7 +122,7 @@ where
         stream: Stream,
         part: Vec<u8>,
         role: Role,
-        config: Option<WebSocketConfig<E>>,
+        config: Option<WebSocketConfig<Ext>>,
     ) -> Self {
         WebSocket {
             socket: stream,
@@ -137,12 +141,12 @@ where
     }
 
     /// Change the configuration.
-    pub fn set_config(&mut self, set_func: impl FnOnce(&mut WebSocketConfig<E>)) {
+    pub fn set_config(&mut self, set_func: impl FnOnce(&mut WebSocketConfig<Ext>)) {
         self.context.set_config(set_func)
     }
 
     /// Read the configuration.
-    pub fn get_config(&self) -> &WebSocketConfig<E> {
+    pub fn get_config(&self) -> &WebSocketConfig<Ext> {
         self.context.get_config()
     }
 
@@ -162,9 +166,10 @@ where
     }
 }
 
-impl<Stream: Read + Write, E> WebSocket<Stream, E>
+impl<Stream, Ext> WebSocket<Stream, Ext>
 where
-    E: WebSocketExtension,
+    Stream: Read + Write,
+    Ext: WebSocketExtension,
 {
     /// Read a message from stream, if possible.
     ///
@@ -248,9 +253,9 @@ where
 
 /// A context for managing WebSocket stream.
 #[derive(Debug)]
-pub struct WebSocketContext<E = PlainTextExt>
+pub struct WebSocketContext<Ext = UncompressedExt>
 where
-    E: WebSocketExtension,
+    Ext: WebSocketExtension,
 {
     /// Server or client?
     role: Role,
@@ -265,15 +270,15 @@ where
     /// Send: an OOB pong message.
     pong: Option<Frame>,
     /// The configuration for the websocket session.
-    config: WebSocketConfig<E>,
+    config: WebSocketConfig<Ext>,
 }
 
-impl<E> WebSocketContext<E>
+impl<Ext> WebSocketContext<Ext>
 where
-    E: WebSocketExtension,
+    Ext: WebSocketExtension,
 {
     /// Create a WebSocket context that manages a post-handshake stream.
-    pub fn new(role: Role, config: Option<WebSocketConfig<E>>) -> Self {
+    pub fn new(role: Role, config: Option<WebSocketConfig<Ext>>) -> Self {
         let config = config.unwrap_or_else(Default::default);
 
         WebSocketContext {
@@ -291,7 +296,7 @@ where
     pub fn from_partially_read(
         part: Vec<u8>,
         role: Role,
-        config: Option<WebSocketConfig<E>>,
+        config: Option<WebSocketConfig<Ext>>,
     ) -> Self {
         WebSocketContext {
             frame: FrameCodec::from_partially_read(part),
@@ -300,12 +305,12 @@ where
     }
 
     /// Change the configuration.
-    pub fn set_config(&mut self, set_func: impl FnOnce(&mut WebSocketConfig<E>)) {
+    pub fn set_config(&mut self, set_func: impl FnOnce(&mut WebSocketConfig<Ext>)) {
         set_func(&mut self.config)
     }
 
     /// Read the configuration.
-    pub fn get_config(&self) -> &WebSocketConfig<E> {
+    pub fn get_config(&self) -> &WebSocketConfig<Ext> {
         &self.config
     }
 
@@ -672,7 +677,7 @@ impl<T> CheckConnectionReset for Result<T> {
 mod tests {
     use super::{Message, Role, WebSocket, WebSocketConfig};
 
-    use crate::extensions::uncompressed::PlainTextExt;
+    use crate::extensions::uncompressed::UncompressedExt;
     use std::io;
     use std::io::Cursor;
 
@@ -700,7 +705,7 @@ mod tests {
             0x2c, 0x20, 0x80, 0x06, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x82, 0x03, 0x01, 0x02,
             0x03,
         ]);
-        let mut socket: WebSocket<_, PlainTextExt> =
+        let mut socket: WebSocket<_, UncompressedExt> =
             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]));
@@ -723,7 +728,7 @@ mod tests {
         let limit = WebSocketConfig {
             max_send_queue: None,
             max_frame_size: Some(16 << 20),
-            encoder: PlainTextExt::new(Some(10)),
+            encoder: UncompressedExt::new(Some(10)),
         };
         let mut socket = WebSocket::from_raw_socket(WriteMoc(incoming), Role::Client, Some(limit));
         assert_eq!(
@@ -738,7 +743,7 @@ mod tests {
         let limit = WebSocketConfig {
             max_send_queue: None,
             max_frame_size: Some(16 << 20),
-            encoder: PlainTextExt::new(Some(2)),
+            encoder: UncompressedExt::new(Some(2)),
         };
         let mut socket = WebSocket::from_raw_socket(WriteMoc(incoming), Role::Client, Some(limit));
         assert_eq!(
diff --git a/src/server.rs b/src/server.rs
index 66130de..99e3757 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -7,7 +7,7 @@ use crate::handshake::HandshakeError;
 
 use crate::protocol::{WebSocket, WebSocketConfig};
 
-use crate::extensions::uncompressed::PlainTextExt;
+use crate::extensions::uncompressed::UncompressedExt;
 use crate::extensions::WebSocketExtension;
 use std::io::{Read, Write};
 
@@ -20,12 +20,13 @@ 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_with_config<S: Read + Write, E>(
-    stream: S,
-    config: Option<WebSocketConfig<E>>,
-) -> Result<WebSocket<S, E>, HandshakeError<ServerHandshake<S, NoCallback, E>>>
+pub fn accept_with_config<Stream, Ext>(
+    stream: Stream,
+    config: Option<WebSocketConfig<Ext>>,
+) -> Result<WebSocket<Stream, Ext>, HandshakeError<ServerHandshake<Stream, NoCallback, Ext>>>
 where
-    E: WebSocketExtension,
+    Stream: Read + Write,
+    Ext: WebSocketExtension,
 {
     accept_hdr_with_config(stream, NoCallback, config)
 }
@@ -38,8 +39,10 @@ where
 /// those from `Mio` and others.
 pub fn accept<S: Read + Write>(
     stream: S,
-) -> Result<WebSocket<S, PlainTextExt>, HandshakeError<ServerHandshake<S, NoCallback, PlainTextExt>>>
-{
+) -> Result<
+    WebSocket<S, UncompressedExt>,
+    HandshakeError<ServerHandshake<S, NoCallback, UncompressedExt>>,
+> {
     accept_with_config(stream, None)
 }
 
@@ -51,13 +54,15 @@ pub fn accept<S: Read + Write>(
 /// 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_with_config<S: Read + Write, C: Callback, E>(
+pub fn accept_hdr_with_config<S, C, Ext>(
     stream: S,
     callback: C,
-    config: Option<WebSocketConfig<E>>,
-) -> Result<WebSocket<S, E>, HandshakeError<ServerHandshake<S, C, E>>>
+    config: Option<WebSocketConfig<Ext>>,
+) -> Result<WebSocket<S, Ext>, HandshakeError<ServerHandshake<S, C, Ext>>>
 where
-    E: WebSocketExtension,
+    S: Read + Write,
+    C: Callback,
+    Ext: WebSocketExtension,
 {
     ServerHandshake::start(stream, callback, config).handshake()
 }
@@ -70,6 +75,6 @@ where
 pub fn accept_hdr<S: Read + Write, C: Callback>(
     stream: S,
     callback: C,
-) -> Result<WebSocket<S, PlainTextExt>, HandshakeError<ServerHandshake<S, C, PlainTextExt>>> {
+) -> Result<WebSocket<S, UncompressedExt>, HandshakeError<ServerHandshake<S, C, UncompressedExt>>> {
     accept_hdr_with_config(stream, callback, None)
 }
diff --git a/tests/connection_reset.rs b/tests/connection_reset.rs
index 1565d2e..87396ff 100644
--- a/tests/connection_reset.rs
+++ b/tests/connection_reset.rs
@@ -8,16 +8,16 @@ use std::time::Duration;
 
 use native_tls::TlsStream;
 use net2::TcpStreamExt;
-use tungstenite::extensions::uncompressed::PlainTextExt;
+use tungstenite::extensions::uncompressed::UncompressedExt;
 use tungstenite::{accept, connect, stream::Stream, Error, Message, WebSocket};
 use url::Url;
 
-type Sock<E> = WebSocket<Stream<TcpStream, TlsStream<TcpStream>>, E>;
+type Sock<Ext> = WebSocket<Stream<TcpStream, TlsStream<TcpStream>>, Ext>;
 
 fn do_test<CT, ST>(port: u16, client_task: CT, server_task: ST)
 where
-    CT: FnOnce(Sock<PlainTextExt>) + Send + 'static,
-    ST: FnOnce(WebSocket<TcpStream, PlainTextExt>),
+    CT: FnOnce(Sock<UncompressedExt>) + Send + 'static,
+    ST: FnOnce(WebSocket<TcpStream, UncompressedExt>),
 {
     env_logger::try_init().ok();