diff --git a/src/dev.rs b/src/dev.rs
index b8d95efbb..13bc48a29 100644
--- a/src/dev.rs
+++ b/src/dev.rs
@@ -18,7 +18,9 @@ pub use actix_http::body::{AnyBody, Body, BodySize, MessageBody, ResponseBody, S
 
 #[cfg(feature = "__compress")]
 pub use actix_http::encoding::Decoder as Decompress;
-pub use actix_http::{Extensions, Payload, PayloadStream, RequestHead, ResponseHead};
+pub use actix_http::{
+    CloneableExtensions, Extensions, Payload, PayloadStream, RequestHead, ResponseHead,
+};
 pub use actix_router::{Path, ResourceDef, ResourcePath, Url};
 pub use actix_server::Server;
 pub use actix_service::{
diff --git a/src/server.rs b/src/server.rs
index 17ff4f657..c302f0352 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -106,8 +106,9 @@ where
     }
 
     /// Sets function that will be called once before each connection is handled.
-    /// It will receive a `&std::any::Any`, which contains underlying connection type and an
-    /// [Extensions] container so that request-local data can be passed to middleware and handlers.
+    /// It will receive a `&std::any::Any`, which contains underlying connection type and a
+    /// [CloneableExtensions] container so that request-local data can be passed to middleware
+    /// and handlers.
     ///
     /// # Connection Types
     /// - `actix_web::rt::net::TcpStream` when no TLS layer is used.