diff --git a/src/error.rs b/src/error.rs
index 3e15c7c..c830024 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -65,7 +65,7 @@ pub enum Error {
     /// HTTP error.
     #[error("HTTP error: {}", .0.status())]
     #[cfg(feature = "handshake")]
-    Http(Response<Option<String>>),
+    Http(Response<Option<Vec<u8>>>),
     /// HTTP format error.
     #[error("HTTP format error: {0}")]
     #[cfg(feature = "handshake")]
diff --git a/src/handshake/client.rs b/src/handshake/client.rs
index 0700fa2..aaeabb7 100644
--- a/src/handshake/client.rs
+++ b/src/handshake/client.rs
@@ -26,7 +26,7 @@ use crate::{
 pub type Request = HttpRequest<()>;
 
 /// Client response type.
-pub type Response = HttpResponse<()>;
+pub type Response = HttpResponse<Option<Vec<u8>>>;
 
 /// Client handshake role.
 #[derive(Debug)]
@@ -83,7 +83,15 @@ impl<S: Read + Write> HandshakeRole for ClientHandshake<S> {
                 ProcessingResult::Continue(HandshakeMachine::start_read(stream))
             }
             StageResult::DoneReading { stream, result, tail } => {
-                let result = self.verify_data.verify_response(result)?;
+                let result = match self.verify_data.verify_response(result) {
+                    Ok(r) => r,
+                    Err(Error::Http(mut e)) => {
+                        *e.body_mut() = Some(tail);
+                        return Err(Error::Http(e))
+                    },
+                    Err(e) => return Err(e),
+                };
+
                 debug!("Client handshake done.");
                 let websocket =
                     WebSocket::from_partially_read(stream, tail, Role::Client, self.config);
@@ -182,7 +190,7 @@ impl VerifyData {
         // 1. If the status code received from the server is not 101, the
         // client handles the response per HTTP [RFC2616] procedures. (RFC 6455)
         if response.status() != StatusCode::SWITCHING_PROTOCOLS {
-            return Err(Error::Http(response.map(|_| None)));
+            return Err(Error::Http(response));
         }
 
         let headers = response.headers();
@@ -255,7 +263,7 @@ impl<'h, 'b: 'h> FromHttparse<httparse::Response<'h, 'b>> for Response {
 
         let headers = HeaderMap::from_httparse(raw.headers)?;
 
-        let mut response = Response::new(());
+        let mut response = Response::new(None);
         *response.status_mut() = StatusCode::from_u16(raw.code.expect("Bug: no HTTP status code"))?;
         *response.headers_mut() = headers;
         // TODO: httparse only supports HTTP 0.9/1.0/1.1 but not HTTP 2.0
diff --git a/src/handshake/server.rs b/src/handshake/server.rs
index 2f095ce..4cf1c5c 100644
--- a/src/handshake/server.rs
+++ b/src/handshake/server.rs
@@ -277,7 +277,10 @@ impl<S: Read + Write, C: Callback> HandshakeRole for ServerHandshake<S, C> {
             StageResult::DoneWriting(stream) => {
                 if let Some(err) = self.error_response.take() {
                     debug!("Server handshake failed.");
-                    return Err(Error::Http(err));
+
+                    let (parts, body) = err.into_parts();
+                    let body = body.map(|b| b.as_bytes().to_vec());
+                    return Err(Error::Http(http::Response::from_parts(parts, body)));
                 } else {
                     debug!("Server handshake done.");
                     let websocket = WebSocket::from_raw_socket(stream, Role::Server, self.config);