diff --git a/actix-http/Cargo.toml b/actix-http/Cargo.toml
index 2c537defc..4ea60bd6d 100644
--- a/actix-http/Cargo.toml
+++ b/actix-http/Cargo.toml
@@ -29,6 +29,9 @@ path = "src/lib.rs"
 [features]
 default = []
 
+http2 = [
+    "h2",
+]
 
 ws = [
     "local-channel",
@@ -65,7 +68,6 @@ bytestring = "1"
 derive_more = "0.99.5"
 encoding_rs = "0.8"
 futures-core = { version = "0.3.7", default-features = false, features = ["alloc"] }
-h2 = "0.3.9"
 http = "0.2.5"
 httparse = "1.5.1"
 httpdate = "1.0.1"
@@ -77,6 +79,9 @@ percent-encoding = "2.1"
 pin-project-lite = "0.2"
 smallvec = "1.6.1"
 
+# http2
+h2 = { version = "0.3.9", optional = true }
+
 # websockets
 local-channel = { version = "0.1", optional = true }
 base64 = { version = "0.13", optional = true }
diff --git a/actix-http/src/builder.rs b/actix-http/src/builder.rs
index 9dd145ce1..526a23d53 100644
--- a/actix-http/src/builder.rs
+++ b/actix-http/src/builder.rs
@@ -6,7 +6,6 @@ use actix_service::{IntoServiceFactory, Service, ServiceFactory};
 use crate::{
     body::{BoxBody, MessageBody},
     h1::{self, ExpectHandler, H1Service, UpgradeHandler},
-    h2::H2Service,
     service::HttpService,
     ConnectCallback, Extensions, KeepAlive, Request, Response, ServiceConfig,
 };
@@ -211,7 +210,8 @@ where
     }
 
     /// Finish service configuration and create a HTTP service for HTTP/2 protocol.
-    pub fn h2<F, B>(self, service: F) -> H2Service<T, S, B>
+    #[cfg(feature = "http2")]
+    pub fn h2<F, B>(self, service: F) -> crate::h2::H2Service<T, S, B>
     where
         F: IntoServiceFactory<S, Request>,
         S::Error: Into<Response<BoxBody>> + 'static,
@@ -228,7 +228,8 @@ where
             self.local_addr,
         );
 
-        H2Service::with_config(cfg, service.into_factory()).on_connect_ext(self.on_connect_ext)
+        crate::h2::H2Service::with_config(cfg, service.into_factory())
+            .on_connect_ext(self.on_connect_ext)
     }
 
     /// Finish service configuration and create `HttpService` instance.
diff --git a/actix-http/src/config.rs b/actix-http/src/config.rs
index aa05d6aba..8045910be 100644
--- a/actix-http/src/config.rs
+++ b/actix-http/src/config.rs
@@ -117,6 +117,7 @@ impl ServiceConfig {
         dst.extend_from_slice(&buf);
     }
 
+    #[allow(unused)] // used with `http2` feature flag
     pub(crate) fn write_date_header_value(&self, dst: &mut BytesMut) {
         self.0
             .date_service
diff --git a/actix-http/src/error.rs b/actix-http/src/error.rs
index d1aab0b92..841322861 100644
--- a/actix-http/src/error.rs
+++ b/actix-http/src/error.rs
@@ -280,8 +280,9 @@ pub enum PayloadError {
     UnknownLength,
 
     /// HTTP/2 payload error.
+    #[cfg(feature = "http2")]
     #[display(fmt = "{}", _0)]
-    Http2Payload(h2::Error),
+    Http2Payload(::h2::Error),
 
     /// Generic I/O error.
     #[display(fmt = "{}", _0)]
@@ -296,14 +297,16 @@ impl std::error::Error for PayloadError {
             PayloadError::EncodingCorrupted => None,
             PayloadError::Overflow => None,
             PayloadError::UnknownLength => None,
+            #[cfg(feature = "http2")]
             PayloadError::Http2Payload(err) => Some(err as &dyn std::error::Error),
             PayloadError::Io(err) => Some(err as &dyn std::error::Error),
         }
     }
 }
 
-impl From<h2::Error> for PayloadError {
-    fn from(err: h2::Error) -> Self {
+#[cfg(feature = "http2")]
+impl From<::h2::Error> for PayloadError {
+    fn from(err: ::h2::Error) -> Self {
         PayloadError::Http2Payload(err)
     }
 }
@@ -359,6 +362,7 @@ pub enum DispatchError {
 
     /// HTTP/2 error.
     #[display(fmt = "{}", _0)]
+    #[cfg(feature = "http2")]
     H2(h2::Error),
 
     /// The first request did not complete within the specified timeout.
@@ -382,7 +386,10 @@ impl StdError for DispatchError {
             DispatchError::Body(err) => Some(&**err),
             DispatchError::Io(err) => Some(err),
             DispatchError::Parse(err) => Some(err),
+
+            #[cfg(feature = "http2")]
             DispatchError::H2(err) => Some(err),
+
             _ => None,
         }
     }
diff --git a/actix-http/src/h2/dispatcher.rs b/actix-http/src/h2/dispatcher.rs
index 7a11f9b33..d528bec96 100644
--- a/actix-http/src/h2/dispatcher.rs
+++ b/actix-http/src/h2/dispatcher.rs
@@ -141,7 +141,7 @@ where
                                 DispatchError::SendResponse(err) => {
                                     trace!("Error sending HTTP/2 response: {:?}", err)
                                 }
-                                DispatchError::SendData(err) => warn!("{:?}", err),
+                                DispatchError::SendData(err) => log::warn!("{:?}", err),
                                 DispatchError::ResponseBody(err) => {
                                     error!("Response payload stream error: {:?}", err)
                                 }
diff --git a/actix-http/src/h2/service.rs b/actix-http/src/h2/service.rs
index 469648054..653982d37 100644
--- a/actix-http/src/h2/service.rs
+++ b/actix-http/src/h2/service.rs
@@ -355,7 +355,7 @@ where
                 }
 
                 Err(err) => {
-                    trace!("H2 handshake error: {}", err);
+                    log::trace!("H2 handshake error: {}", err);
                     Poll::Ready(Err(err))
                 }
             },
diff --git a/actix-http/src/http_message.rs b/actix-http/src/http_message.rs
index 068e23b96..198254e02 100644
--- a/actix-http/src/http_message.rs
+++ b/actix-http/src/http_message.rs
@@ -55,7 +55,7 @@ pub trait HttpMessage: Sized {
         ""
     }
 
-    /// Get content type encoding
+    /// Get content type encoding.
     ///
     /// UTF-8 is used by default, If request charset is not set.
     fn encoding(&self) -> Result<&'static Encoding, ContentTypeError> {
diff --git a/actix-http/src/keep_alive.rs b/actix-http/src/keep_alive.rs
index 27161614d..feb7ff5df 100644
--- a/actix-http/src/keep_alive.rs
+++ b/actix-http/src/keep_alive.rs
@@ -24,6 +24,7 @@ impl KeepAlive {
         !matches!(self, Self::Disabled)
     }
 
+    #[allow(unused)] // used with `http2` feature flag
     pub(crate) fn duration(&self) -> Option<Duration> {
         match self {
             KeepAlive::Timeout(dur) => Some(*dur),
diff --git a/actix-http/src/lib.rs b/actix-http/src/lib.rs
index cdf61b6a6..dbff89612 100644
--- a/actix-http/src/lib.rs
+++ b/actix-http/src/lib.rs
@@ -24,9 +24,6 @@
 #![doc(html_logo_url = "https://actix.rs/img/logo.png")]
 #![doc(html_favicon_url = "https://actix.rs/favicon.ico")]
 
-#[macro_use]
-extern crate log;
-
 pub use ::http::{uri, uri::Uri};
 pub use ::http::{Method, StatusCode, Version};
 
@@ -39,6 +36,7 @@ pub mod encoding;
 pub mod error;
 mod extensions;
 pub mod h1;
+#[cfg(feature = "http2")]
 pub mod h2;
 pub mod header;
 mod helpers;
diff --git a/actix-http/src/payload.rs b/actix-http/src/payload.rs
index aed24e963..33d9ec6f5 100644
--- a/actix-http/src/payload.rs
+++ b/actix-http/src/payload.rs
@@ -16,6 +16,18 @@ pub type BoxedPayloadStream = Pin<Box<dyn Stream<Item = Result<Bytes, PayloadErr
 #[deprecated(since = "4.0.0", note = "Renamed to `BoxedPayloadStream`.")]
 pub type PayloadStream = BoxedPayloadStream;
 
+#[cfg(not(feature = "http2"))]
+pin_project! {
+    /// A streaming payload.
+    #[project = PayloadProj]
+    pub enum Payload<S = BoxedPayloadStream> {
+        None,
+        H1 { payload: crate::h1::Payload },
+        Stream { #[pin] payload: S },
+    }
+}
+
+#[cfg(feature = "http2")]
 pin_project! {
     /// A streaming payload.
     #[project = PayloadProj]
@@ -33,14 +45,16 @@ impl<S> From<crate::h1::Payload> for Payload<S> {
     }
 }
 
+#[cfg(feature = "http2")]
 impl<S> From<crate::h2::Payload> for Payload<S> {
     fn from(payload: crate::h2::Payload) -> Self {
         Payload::H2 { payload }
     }
 }
 
-impl<S> From<h2::RecvStream> for Payload<S> {
-    fn from(stream: h2::RecvStream) -> Self {
+#[cfg(feature = "http2")]
+impl<S> From<::h2::RecvStream> for Payload<S> {
+    fn from(stream: ::h2::RecvStream) -> Self {
         Payload::H2 {
             payload: crate::h2::Payload::new(stream),
         }
@@ -71,7 +85,10 @@ where
         match self.project() {
             PayloadProj::None => Poll::Ready(None),
             PayloadProj::H1 { payload } => Pin::new(payload).poll_next(cx),
+
+            #[cfg(feature = "http2")]
             PayloadProj::H2 { payload } => Pin::new(payload).poll_next(cx),
+
             PayloadProj::Stream { payload } => payload.poll_next(cx),
         }
     }
diff --git a/actix-http/src/service.rs b/actix-http/src/service.rs
index 4fe573aa5..b220e55a4 100644
--- a/actix-http/src/service.rs
+++ b/actix-http/src/service.rs
@@ -20,7 +20,7 @@ use crate::{
     body::{BoxBody, MessageBody},
     builder::HttpServiceBuilder,
     error::DispatchError,
-    h1, h2, ConnectCallback, OnConnectData, Protocol, Request, Response, ServiceConfig,
+    h1, ConnectCallback, OnConnectData, Protocol, Request, Response, ServiceConfig,
 };
 
 /// A `ServiceFactory` for HTTP/1.1 or HTTP/2 protocol.
@@ -502,10 +502,11 @@ where
         let conn_data = OnConnectData::from_io(&io, self.on_connect_ext.as_deref());
 
         match proto {
+            #[cfg(feature = "http2")]
             Protocol::Http2 => HttpServiceHandlerResponse {
                 state: State::H2Handshake {
                     handshake: Some((
-                        h2::handshake_with_timeout(io, &self.cfg),
+                        crate::h2::handshake_with_timeout(io, &self.cfg),
                         self.cfg.clone(),
                         self.flow.clone(),
                         conn_data,
@@ -514,6 +515,11 @@ where
                 },
             },
 
+            #[cfg(not(feature = "http2"))]
+            Protocol::Http2 => {
+                panic!("HTTP/2 support is disabled (enable with the `http2` feature flag)")
+            }
+
             Protocol::Http1 => HttpServiceHandlerResponse {
                 state: State::H1 {
                     dispatcher: h1::Dispatcher::new(
@@ -531,6 +537,7 @@ where
     }
 }
 
+#[cfg(not(feature = "http2"))]
 pin_project! {
     #[project = StateProj]
     enum State<T, S, B, X, U>
@@ -552,10 +559,37 @@ pin_project! {
         U::Error: fmt::Display,
     {
         H1 { #[pin] dispatcher: h1::Dispatcher<T, S, B, X, U> },
-        H2 { #[pin] dispatcher: h2::Dispatcher<T, S, B, X, U> },
+    }
+}
+
+#[cfg(feature = "http2")]
+pin_project! {
+    #[project = StateProj]
+    enum State<T, S, B, X, U>
+    where
+        T: AsyncRead,
+        T: AsyncWrite,
+        T: Unpin,
+
+        S: Service<Request>,
+        S::Future: 'static,
+        S::Error: Into<Response<BoxBody>>,
+
+        B: MessageBody,
+
+        X: Service<Request, Response = Request>,
+        X::Error: Into<Response<BoxBody>>,
+
+        U: Service<(Request, Framed<T, h1::Codec>), Response = ()>,
+        U::Error: fmt::Display,
+    {
+        H1 { #[pin] dispatcher: h1::Dispatcher<T, S, B, X, U> },
+
+        H2 { #[pin] dispatcher: crate::h2::Dispatcher<T, S, B, X, U> },
+
         H2Handshake {
             handshake: Option<(
-                h2::HandshakeWithTimeout<T>,
+                crate::h2::HandshakeWithTimeout<T>,
                 ServiceConfig,
                 Rc<HttpFlow<S, X, U>>,
                 OnConnectData,
@@ -614,21 +648,25 @@ where
     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
         match self.as_mut().project().state.project() {
             StateProj::H1 { dispatcher } => dispatcher.poll(cx),
+
+            #[cfg(feature = "http2")]
             StateProj::H2 { dispatcher } => dispatcher.poll(cx),
+
+            #[cfg(feature = "http2")]
             StateProj::H2Handshake { handshake: data } => {
                 match ready!(Pin::new(&mut data.as_mut().unwrap().0).poll(cx)) {
                     Ok((conn, timer)) => {
                         let (_, config, flow, conn_data, peer_addr) = data.take().unwrap();
 
                         self.as_mut().project().state.set(State::H2 {
-                            dispatcher: h2::Dispatcher::new(
+                            dispatcher: crate::h2::Dispatcher::new(
                                 conn, flow, config, peer_addr, conn_data, timer,
                             ),
                         });
                         self.poll(cx)
                     }
                     Err(err) => {
-                        trace!("H2 handshake error: {}", err);
+                        log::trace!("H2 handshake error: {}", err);
                         Poll::Ready(Err(err))
                     }
                 }