diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fdd6f0f9a..f071ec8f3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -69,7 +69,7 @@ jobs:
         run: |
           cargo test --lib --tests -p=actix-router --all-features
           cargo test --lib --tests -p=actix-http --all-features
-          cargo test --lib --tests -p=actix-web --features=rustls,openssl -- --skip=test_reading_deflate_encoding_large_random_rustls
+          cargo test --lib --tests -p=actix-web --features=rustls-0_20,rustls-0_21,openssl -- --skip=test_reading_deflate_encoding_large_random_rustls
           cargo test --lib --tests -p=actix-web-codegen --all-features
           cargo test --lib --tests -p=awc --all-features
           cargo test --lib --tests -p=actix-http-test --all-features
diff --git a/.github/workflows/clippy-fmt.yml b/.github/workflows/clippy-fmt.yml
index 109165ce0..25c05bcbc 100644
--- a/.github/workflows/clippy-fmt.yml
+++ b/.github/workflows/clippy-fmt.yml
@@ -39,7 +39,7 @@ jobs:
         with:
           reporter: 'github-pr-check'
           github_token: ${{ secrets.GITHUB_TOKEN }}
-          clippy_flags: --workspace --all-features --tests --examples --bins -- -Dclippy::todo
+          clippy_flags: --workspace --all-features --tests --examples --bins -- -Dclippy::todo -Aunknown_lints
 
   lint-docs:
     runs-on: ubuntu-latest
@@ -63,8 +63,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - uses: actions-rust-lang/setup-rust-toolchain@v1
-        # temp: unpin once https://github.com/rust-lang/rust/issues/113152 is fixed
-        with: { toolchain: nightly-2023-06-28 }
+        with: { toolchain: nightly-2023-08-25 }
 
       - uses: taiki-e/cache-cargo-install-action@v1
         with: { tool: cargo-public-api }
diff --git a/actix-files/src/lib.rs b/actix-files/src/lib.rs
index 1d8609889..7871905f6 100644
--- a/actix-files/src/lib.rs
+++ b/actix-files/src/lib.rs
@@ -66,6 +66,7 @@ type PathFilter = dyn Fn(&Path, &RequestHead) -> bool;
 #[cfg(test)]
 mod tests {
     use std::{
+        fmt::Write as _,
         fs::{self},
         ops::Add,
         time::{Duration, SystemTime},
@@ -848,8 +849,10 @@ mod tests {
         let filename_encoded = filename
             .as_bytes()
             .iter()
-            .map(|c| format!("%{:02X}", c))
-            .collect::<String>();
+            .fold(String::new(), |mut buf, c| {
+                write!(&mut buf, "%{:02X}", c).unwrap();
+                buf
+            });
         std::fs::File::create(tmpdir.path().join(filename)).unwrap();
 
         let srv = test::init_service(App::new().service(Files::new("", tmpdir.path()))).await;
diff --git a/actix-http/Cargo.toml b/actix-http/Cargo.toml
index 61fba4bce..6aaaecfd4 100644
--- a/actix-http/Cargo.toml
+++ b/actix-http/Cargo.toml
@@ -21,7 +21,7 @@ rust-version.workspace = true
 
 [package.metadata.docs.rs]
 # features that docs.rs will build with
-features = ["http2", "ws", "openssl", "rustls", "compress-brotli", "compress-gzip", "compress-zstd"]
+features = ["http2", "ws", "openssl", "rustls-0_20", "rustls-0_21", "compress-brotli", "compress-gzip", "compress-zstd"]
 
 [lib]
 name = "actix_http"
diff --git a/actix-http/src/h1/payload.rs b/actix-http/src/h1/payload.rs
index 1ed785a1b..2ad3a14a3 100644
--- a/actix-http/src/h1/payload.rs
+++ b/actix-http/src/h1/payload.rs
@@ -117,6 +117,7 @@ impl PayloadSender {
         }
     }
 
+    #[allow(clippy::needless_pass_by_ref_mut)]
     #[inline]
     pub fn need_read(&self, cx: &mut Context<'_>) -> PayloadStatus {
         // we check need_read only if Payload (other side) is alive,
@@ -174,7 +175,7 @@ impl Inner {
 
     /// Register future waiting data from payload.
     /// Waker would be used in `Inner::wake`
-    fn register(&mut self, cx: &mut Context<'_>) {
+    fn register(&mut self, cx: &Context<'_>) {
         if self
             .task
             .as_ref()
@@ -186,7 +187,7 @@ impl Inner {
 
     // Register future feeding data to payload.
     /// Waker would be used in `Inner::wake_io`
-    fn register_io(&mut self, cx: &mut Context<'_>) {
+    fn register_io(&mut self, cx: &Context<'_>) {
         if self
             .io_task
             .as_ref()
@@ -221,7 +222,7 @@ impl Inner {
 
     fn poll_next(
         mut self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
+        cx: &Context<'_>,
     ) -> Poll<Option<Result<Bytes, PayloadError>>> {
         if let Some(data) = self.items.pop_front() {
             self.len -= data.len();
diff --git a/actix-http/src/service.rs b/actix-http/src/service.rs
index bb0fda8c4..fb38ba636 100644
--- a/actix-http/src/service.rs
+++ b/actix-http/src/service.rs
@@ -247,7 +247,7 @@ pub struct TlsAcceptorConfig {
     pub(crate) handshake_timeout: Option<std::time::Duration>,
 }
 
-#[cfg(any(feature = "openssl", feature = "rustls", feature = "rustls-0_21"))]
+#[cfg(any(feature = "openssl", feature = "rustls-0_20", feature = "rustls-0_21"))]
 impl TlsAcceptorConfig {
     /// Set TLS handshake timeout duration.
     pub fn handshake_timeout(self, dur: std::time::Duration) -> Self {
diff --git a/actix-multipart/src/server.rs b/actix-multipart/src/server.rs
index b20429040..c08031eba 100644
--- a/actix-multipart/src/server.rs
+++ b/actix-multipart/src/server.rs
@@ -252,7 +252,7 @@ impl InnerMultipart {
     fn poll(
         &mut self,
         safety: &Safety,
-        cx: &mut Context<'_>,
+        cx: &Context<'_>,
     ) -> Poll<Option<Result<Field, MultipartError>>> {
         if self.state == InnerState::Eof {
             Poll::Ready(None)
@@ -740,7 +740,7 @@ impl Safety {
         self.clean.get()
     }
 
-    fn clone(&self, cx: &mut Context<'_>) -> Safety {
+    fn clone(&self, cx: &Context<'_>) -> Safety {
         let payload = Rc::clone(&self.payload);
         let s = Safety {
             task: LocalWaker::new(),
diff --git a/actix-router/benches/quoter.rs b/actix-router/benches/quoter.rs
index 2065fd563..c78240809 100644
--- a/actix-router/benches/quoter.rs
+++ b/actix-router/benches/quoter.rs
@@ -1,6 +1,6 @@
 #![allow(clippy::uninlined_format_args)]
 
-use std::borrow::Cow;
+use std::{borrow::Cow, fmt::Write as _};
 
 use criterion::{black_box, criterion_group, criterion_main, Criterion};
 
@@ -8,9 +8,10 @@ fn compare_quoters(c: &mut Criterion) {
     let mut group = c.benchmark_group("Compare Quoters");
 
     let quoter = actix_router::Quoter::new(b"", b"");
-    let path_quoted = (0..=0x7f)
-        .map(|c| format!("%{:02X}", c))
-        .collect::<String>();
+    let path_quoted = (0..=0x7f).fold(String::new(), |mut buf, c| {
+        write!(&mut buf, "%{:02X}", c).unwrap();
+        buf
+    });
     let path_unquoted = ('\u{00}'..='\u{7f}').collect::<String>();
 
     group.bench_function("quoter_unquoted", |b| {
diff --git a/actix-router/src/url.rs b/actix-router/src/url.rs
index 2920e271d..b3d9e1121 100644
--- a/actix-router/src/url.rs
+++ b/actix-router/src/url.rs
@@ -62,6 +62,8 @@ impl ResourcePath for Url {
 
 #[cfg(test)]
 mod tests {
+    use std::fmt::Write as _;
+
     use http::Uri;
 
     use super::*;
@@ -78,7 +80,11 @@ mod tests {
     }
 
     fn percent_encode(data: &[u8]) -> String {
-        data.iter().map(|c| format!("%{:02X}", c)).collect()
+        data.iter()
+            .fold(String::with_capacity(data.len() * 3), |mut buf, c| {
+                write!(&mut buf, "%{:02X}", c).unwrap();
+                buf
+            })
     }
 
     #[test]
diff --git a/actix-test/CHANGES.md b/actix-test/CHANGES.md
index fae8201d2..477ed4c04 100644
--- a/actix-test/CHANGES.md
+++ b/actix-test/CHANGES.md
@@ -2,7 +2,9 @@
 
 ## Unreleased - 2023-xx-xx
 
-- Add `TestServerConfig::workers()` setter method.
+- Add `TestServerConfig::rustls_021()` method for Rustls v0.21 support behind new `rustls-0_21` crate feature.
+- Add `TestServerConfig::workers()` method.
+- Add `rustls-0_20` crate feature, which the existing `rustls` feature now aliases.
 - Minimum supported Rust version (MSRV) is now 1.68 due to transitive `time` dependency.
 
 ## 0.1.1 - 2023-02-26
diff --git a/actix-test/Cargo.toml b/actix-test/Cargo.toml
index 9cf5aa76c..dd96084b3 100644
--- a/actix-test/Cargo.toml
+++ b/actix-test/Cargo.toml
@@ -21,10 +21,14 @@ edition = "2021"
 [features]
 default = []
 
-# rustls
-rustls = ["tls-rustls", "actix-http/rustls", "awc/rustls"]
+# TLS via Rustls v0.20
+rustls = ["rustls-0_20"]
+# TLS via Rustls v0.20
+rustls-0_20 = ["tls-rustls-0_20", "actix-http/rustls-0_20", "awc/rustls-0_20"]
+# TLS via Rustls v0.21
+rustls-0_21 = ["tls-rustls-0_21", "actix-http/rustls-0_21", "awc/rustls-0_21"]
 
-# openssl
+# TLS via OpenSSL
 openssl = ["tls-openssl", "actix-http/openssl", "awc/openssl"]
 
 [dependencies]
@@ -44,5 +48,6 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 serde_urlencoded = "0.7"
 tls-openssl = { package = "openssl", version = "0.10.55", optional = true }
-tls-rustls = { package = "rustls", version = "0.20", optional = true }
+tls-rustls-0_20 = { package = "rustls", version = "0.20", optional = true }
+tls-rustls-0_21 = { package = "rustls", version = "0.21", optional = true }
 tokio = { version = "1.24.2", features = ["sync"] }
diff --git a/actix-test/src/lib.rs b/actix-test/src/lib.rs
index 751ab3161..e570bb266 100644
--- a/actix-test/src/lib.rs
+++ b/actix-test/src/lib.rs
@@ -34,8 +34,6 @@
 
 #[cfg(feature = "openssl")]
 extern crate tls_openssl as openssl;
-#[cfg(feature = "rustls")]
-extern crate tls_rustls as rustls;
 
 use std::{fmt, net, thread, time::Duration};
 
@@ -141,8 +139,10 @@ where
         StreamType::Tcp => false,
         #[cfg(feature = "openssl")]
         StreamType::Openssl(_) => true,
-        #[cfg(feature = "rustls")]
-        StreamType::Rustls(_) => true,
+        #[cfg(feature = "rustls-0_20")]
+        StreamType::Rustls020(_) => true,
+        #[cfg(feature = "rustls-0_21")]
+        StreamType::Rustls021(_) => true,
     };
 
     // run server in separate orphaned thread
@@ -243,8 +243,8 @@ where
                             .openssl(acceptor.clone())
                     }),
                 },
-                #[cfg(feature = "rustls")]
-                StreamType::Rustls(config) => match cfg.tp {
+                #[cfg(feature = "rustls-0_20")]
+                StreamType::Rustls020(config) => match cfg.tp {
                     HttpVer::Http1 => builder.listen("test", tcp, move || {
                         let app_cfg =
                             AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
@@ -285,6 +285,48 @@ where
                             .rustls(config.clone())
                     }),
                 },
+                #[cfg(feature = "rustls-0_21")]
+                StreamType::Rustls021(config) => match cfg.tp {
+                    HttpVer::Http1 => builder.listen("test", tcp, move || {
+                        let app_cfg =
+                            AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                        let fac = factory()
+                            .into_factory()
+                            .map_err(|err| err.into().error_response());
+
+                        HttpService::build()
+                            .client_request_timeout(timeout)
+                            .h1(map_config(fac, move |_| app_cfg.clone()))
+                            .rustls_021(config.clone())
+                    }),
+                    HttpVer::Http2 => builder.listen("test", tcp, move || {
+                        let app_cfg =
+                            AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                        let fac = factory()
+                            .into_factory()
+                            .map_err(|err| err.into().error_response());
+
+                        HttpService::build()
+                            .client_request_timeout(timeout)
+                            .h2(map_config(fac, move |_| app_cfg.clone()))
+                            .rustls_021(config.clone())
+                    }),
+                    HttpVer::Both => builder.listen("test", tcp, move || {
+                        let app_cfg =
+                            AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                        let fac = factory()
+                            .into_factory()
+                            .map_err(|err| err.into().error_response());
+
+                        HttpService::build()
+                            .client_request_timeout(timeout)
+                            .finish(map_config(fac, move |_| app_cfg.clone()))
+                            .rustls_021(config.clone())
+                    }),
+                },
             }
             .expect("test server could not be created");
 
@@ -316,7 +358,7 @@ where
                 builder.set_verify(SslVerifyMode::NONE);
                 let _ = builder
                     .set_alpn_protos(b"\x02h2\x08http/1.1")
-                    .map_err(|e| log::error!("Can not set alpn protocol: {:?}", e));
+                    .map_err(|err| log::error!("Can not set alpn protocol: {err:?}"));
                 Connector::new()
                     .conn_lifetime(Duration::from_secs(0))
                     .timeout(Duration::from_millis(30000))
@@ -355,8 +397,10 @@ enum StreamType {
     Tcp,
     #[cfg(feature = "openssl")]
     Openssl(openssl::ssl::SslAcceptor),
-    #[cfg(feature = "rustls")]
-    Rustls(rustls::ServerConfig),
+    #[cfg(feature = "rustls-0_20")]
+    Rustls020(tls_rustls_0_20::ServerConfig),
+    #[cfg(feature = "rustls-0_21")]
+    Rustls021(tls_rustls_0_21::ServerConfig),
 }
 
 /// Create default test server config.
@@ -411,9 +455,16 @@ impl TestServerConfig {
     }
 
     /// Accept secure connections via Rustls.
-    #[cfg(feature = "rustls")]
-    pub fn rustls(mut self, config: rustls::ServerConfig) -> Self {
-        self.stream = StreamType::Rustls(config);
+    #[cfg(feature = "rustls-0_20")]
+    pub fn rustls(mut self, config: tls_rustls_0_20::ServerConfig) -> Self {
+        self.stream = StreamType::Rustls020(config);
+        self
+    }
+
+    /// Accept secure connections via Rustls.
+    #[cfg(feature = "rustls-0_21")]
+    pub fn rustls_021(mut self, config: tls_rustls_0_21::ServerConfig) -> Self {
+        self.stream = StreamType::Rustls021(config);
         self
     }
 
diff --git a/actix-web/CHANGES.md b/actix-web/CHANGES.md
index 97bf4ed04..aaa262e63 100644
--- a/actix-web/CHANGES.md
+++ b/actix-web/CHANGES.md
@@ -4,13 +4,15 @@
 
 ### Added
 
-- Add `HttpServer::{bind, listen}_auto_h2c()` method behind new `http2` crate feature.
+- Add `HttpServer::{bind, listen}_auto_h2c()` methods behind new `http2` crate feature.
+- Add `HttpServer::{bind, listen}_rustls_021()` methods for Rustls v0.21 support behind new `rustls-0_21` crate feature.
 - Add `Resource::{get, post, etc...}` methods for more concisely adding routes that don't need additional guards.
 - Add `web::Payload::to_bytes[_limited]()` helper methods.
 - Add missing constructors on `HttpResponse` for several status codes.
 - Add `http::header::ContentLength` typed header.
 - Implement `Default` for `web::Data`.
 - Implement `serde::Deserialize` for `web::Data`.
+- Add `rustls-0_20` crate feature, which the existing `rustls` feature now aliases.
 
 ### Changed
 
diff --git a/actix-web/Cargo.toml b/actix-web/Cargo.toml
index 7dbaa2a29..e85a0c90e 100644
--- a/actix-web/Cargo.toml
+++ b/actix-web/Cargo.toml
@@ -21,7 +21,7 @@ rust-version.workspace = true
 
 [package.metadata.docs.rs]
 # features that docs.rs will build with
-features = ["macros", "openssl", "rustls", "compress-brotli", "compress-gzip", "compress-zstd", "cookies", "secure-cookies"]
+features = ["macros", "openssl", "rustls-0_20", "rustls-0_21", "compress-brotli", "compress-gzip", "compress-zstd", "cookies", "secure-cookies"]
 rustdoc-args = ["--cfg", "docsrs"]
 
 [lib]
@@ -52,8 +52,12 @@ http2 = ["actix-http/http2"]
 # TLS via OpenSSL
 openssl = ["http2", "actix-http/openssl", "actix-tls/accept", "actix-tls/openssl"]
 
-# TLS via Rustls
-rustls = ["http2", "actix-http/rustls", "actix-tls/accept", "actix-tls/rustls"]
+# TLS via Rustls v0.20
+rustls = ["rustls-0_20"]
+# TLS via Rustls v0.20
+rustls-0_20 = ["http2", "actix-http/rustls-0_20", "actix-tls/accept", "actix-tls/rustls-0_20"]
+# TLS via Rustls v0.21
+rustls-0_21 = ["http2", "actix-http/rustls-0_21", "actix-tls/accept", "actix-tls/rustls-0_21"]
 
 # Internal (PRIVATE!) features used to aid testing and checking feature status.
 # Don't rely on these whatsoever. They may disappear at anytime.
@@ -69,7 +73,7 @@ actix-rt = { version = "2.6", default-features = false }
 actix-server = "2"
 actix-service = "2"
 actix-utils = "3"
-actix-tls = { version = "3", default-features = false, optional = true }
+actix-tls = { version = "3.1", default-features = false, optional = true }
 
 actix-http = { version = "3.3", features = ["ws"] }
 actix-router = "0.5"
@@ -101,7 +105,7 @@ url = "2.1"
 
 [dev-dependencies]
 actix-files = "0.6"
-actix-test = { version = "0.1", features = ["openssl", "rustls"] }
+actix-test = { version = "0.1", features = ["openssl", "rustls-0_21"] }
 awc = { version = "3", features = ["openssl"] }
 
 brotli = "3.3.3"
@@ -116,7 +120,7 @@ rustls-pemfile = "1"
 serde = { version = "1.0", features = ["derive"] }
 static_assertions = "1"
 tls-openssl = { package = "openssl", version = "0.10.55" }
-tls-rustls = { package = "rustls", version = "0.20" }
+tls-rustls = { package = "rustls", version = "0.21" }
 tokio = { version = "1.24.2", features = ["rt-multi-thread", "macros"] }
 zstd = "0.12"
 
diff --git a/actix-web/src/app_service.rs b/actix-web/src/app_service.rs
index 513e7a8a1..f2dca954c 100644
--- a/actix-web/src/app_service.rs
+++ b/actix-web/src/app_service.rs
@@ -112,11 +112,7 @@ where
         let endpoint_fut = self.endpoint.new_service(());
 
         // take extensions or create new one as app data container.
-        let mut app_data = self
-            .extensions
-            .borrow_mut()
-            .take()
-            .unwrap_or_else(Extensions::new);
+        let mut app_data = self.extensions.borrow_mut().take().unwrap_or_default();
 
         Box::pin(async move {
             // async data factories
diff --git a/actix-web/src/handler.rs b/actix-web/src/handler.rs
index 0c5e58e28..3d6b7f039 100644
--- a/actix-web/src/handler.rs
+++ b/actix-web/src/handler.rs
@@ -167,7 +167,7 @@ mod tests {
         async fn handler_min() {}
 
         #[rustfmt::skip]
-        #[allow(clippy::too_many_arguments, clippy::just_underscores_and_digits)]
+        #[allow(clippy::too_many_arguments, clippy::just_underscores_and_digits, clippy::let_unit_value)]
         async fn handler_max(
             _01: (), _02: (), _03: (), _04: (), _05: (), _06: (),
             _07: (), _08: (), _09: (), _10: (), _11: (), _12: (),
diff --git a/actix-web/src/route.rs b/actix-web/src/route.rs
index 674d0082a..a46c1fdd4 100644
--- a/actix-web/src/route.rs
+++ b/actix-web/src/route.rs
@@ -92,7 +92,7 @@ pub struct RouteService {
 }
 
 impl RouteService {
-    // TODO: does this need to take &mut ?
+    #[allow(clippy::needless_pass_by_ref_mut)]
     pub fn check(&self, req: &mut ServiceRequest) -> bool {
         let guard_ctx = req.guard_ctx();
 
diff --git a/actix-web/src/server.rs b/actix-web/src/server.rs
index a540da7c8..879b269a0 100644
--- a/actix-web/src/server.rs
+++ b/actix-web/src/server.rs
@@ -7,7 +7,7 @@ use std::{
     time::Duration,
 };
 
-#[cfg(any(feature = "openssl", feature = "rustls"))]
+#[cfg(any(feature = "openssl", feature = "rustls-0_20", feature = "rustls-0_21"))]
 use actix_http::TlsAcceptorConfig;
 use actix_http::{body::MessageBody, Extensions, HttpService, KeepAlive, Request, Response};
 use actix_server::{Server, ServerBuilder};
@@ -16,8 +16,6 @@ use actix_service::{
 };
 #[cfg(feature = "openssl")]
 use actix_tls::accept::openssl::reexports::{AlpnError, SslAcceptor, SslAcceptorBuilder};
-#[cfg(feature = "rustls")]
-use actix_tls::accept::rustls::reexports::ServerConfig as RustlsServerConfig;
 
 use crate::{config::AppConfig, Error};
 
@@ -31,7 +29,7 @@ struct Config {
     keep_alive: KeepAlive,
     client_request_timeout: Duration,
     client_disconnect_timeout: Duration,
-    #[cfg(any(feature = "openssl", feature = "rustls"))]
+    #[allow(dead_code)] // only dead when no TLS features are enabled
     tls_handshake_timeout: Option<Duration>,
 }
 
@@ -109,7 +107,6 @@ where
                 keep_alive: KeepAlive::default(),
                 client_request_timeout: Duration::from_secs(5),
                 client_disconnect_timeout: Duration::from_secs(1),
-                #[cfg(any(feature = "rustls", feature = "openssl"))]
                 tls_handshake_timeout: None,
             })),
             backlog: 1024,
@@ -170,7 +167,7 @@ where
     /// By default max connections is set to a 256.
     #[allow(unused_variables)]
     pub fn max_connection_rate(self, num: usize) -> Self {
-        #[cfg(any(feature = "rustls", feature = "openssl"))]
+        #[cfg(any(feature = "rustls-0_20", feature = "rustls-0_21", feature = "openssl"))]
         actix_tls::accept::max_concurrent_tls_connect(num);
         self
     }
@@ -222,8 +219,8 @@ where
     /// Defines a timeout for TLS handshake. If the TLS handshake does not complete within this
     /// time, the connection is closed.
     ///
-    /// By default handshake timeout is set to 3000 milliseconds.
-    #[cfg(any(feature = "openssl", feature = "rustls"))]
+    /// By default, the handshake timeout is 3 seconds.
+    #[cfg(any(feature = "openssl", feature = "rustls-0_20", feature = "rustls-0_21"))]
     pub fn tls_handshake_timeout(self, dur: Duration) -> Self {
         self.config
             .lock()
@@ -247,7 +244,10 @@ where
     ///
     /// # Connection Types
     /// - `actix_tls::accept::openssl::TlsStream<actix_web::rt::net::TcpStream>` when using OpenSSL.
-    /// - `actix_tls::accept::rustls::TlsStream<actix_web::rt::net::TcpStream>` when using Rustls.
+    /// - `actix_tls::accept::rustls_0_20::TlsStream<actix_web::rt::net::TcpStream>` when using
+    ///   Rustls v0.20.
+    /// - `actix_tls::accept::rustls_0_21::TlsStream<actix_web::rt::net::TcpStream>` when using
+    ///   Rustls v0.21.
     /// - `actix_web::rt::net::TcpStream` when no encryption is used.
     ///
     /// See the `on_connect` example for additional details.
@@ -368,20 +368,39 @@ where
     }
 
     /// Resolves socket address(es) and binds server to created listener(s) for TLS connections
-    /// using Rustls.
+    /// using Rustls v0.20.
     ///
     /// See [`bind()`](Self::bind) for more details on `addrs` argument.
     ///
     /// ALPN protocols "h2" and "http/1.1" are added to any configured ones.
-    #[cfg(feature = "rustls")]
+    #[cfg(feature = "rustls-0_20")]
     pub fn bind_rustls<A: net::ToSocketAddrs>(
         mut self,
         addrs: A,
-        config: RustlsServerConfig,
+        config: actix_tls::accept::rustls_0_20::reexports::ServerConfig,
     ) -> io::Result<Self> {
         let sockets = bind_addrs(addrs, self.backlog)?;
         for lst in sockets {
-            self = self.listen_rustls_inner(lst, config.clone())?;
+            self = self.listen_rustls_0_20_inner(lst, config.clone())?;
+        }
+        Ok(self)
+    }
+
+    /// Resolves socket address(es) and binds server to created listener(s) for TLS connections
+    /// using Rustls v0.21.
+    ///
+    /// See [`bind()`](Self::bind) for more details on `addrs` argument.
+    ///
+    /// ALPN protocols "h2" and "http/1.1" are added to any configured ones.
+    #[cfg(feature = "rustls-0_21")]
+    pub fn bind_rustls_021<A: net::ToSocketAddrs>(
+        mut self,
+        addrs: A,
+        config: actix_tls::accept::rustls_0_21::reexports::ServerConfig,
+    ) -> io::Result<Self> {
+        let sockets = bind_addrs(addrs, self.backlog)?;
+        for lst in sockets {
+            self = self.listen_rustls_0_21_inner(lst, config.clone())?;
         }
         Ok(self)
     }
@@ -497,25 +516,41 @@ where
         Ok(self)
     }
 
-    /// Binds to existing listener for accepting incoming TLS connection requests using Rustls.
+    /// Binds to existing listener for accepting incoming TLS connection requests using Rustls
+    /// v0.20.
     ///
     /// See [`listen()`](Self::listen) for more details on the `lst` argument.
     ///
     /// ALPN protocols "h2" and "http/1.1" are added to any configured ones.
-    #[cfg(feature = "rustls")]
+    #[cfg(feature = "rustls-0_20")]
     pub fn listen_rustls(
         self,
         lst: net::TcpListener,
-        config: RustlsServerConfig,
+        config: actix_tls::accept::rustls_0_20::reexports::ServerConfig,
     ) -> io::Result<Self> {
-        self.listen_rustls_inner(lst, config)
+        self.listen_rustls_0_20_inner(lst, config)
     }
 
-    #[cfg(feature = "rustls")]
-    fn listen_rustls_inner(
+    /// Binds to existing listener for accepting incoming TLS connection requests using Rustls
+    /// v0.21.
+    ///
+    /// See [`listen()`](Self::listen) for more details on the `lst` argument.
+    ///
+    /// ALPN protocols "h2" and "http/1.1" are added to any configured ones.
+    #[cfg(feature = "rustls-0_21")]
+    pub fn listen_rustls_0_21(
+        self,
+        lst: net::TcpListener,
+        config: actix_tls::accept::rustls_0_21::reexports::ServerConfig,
+    ) -> io::Result<Self> {
+        self.listen_rustls_0_21_inner(lst, config)
+    }
+
+    #[cfg(feature = "rustls-0_20")]
+    fn listen_rustls_0_20_inner(
         mut self,
         lst: net::TcpListener,
-        config: RustlsServerConfig,
+        config: actix_tls::accept::rustls_0_20::reexports::ServerConfig,
     ) -> io::Result<Self> {
         let factory = self.factory.clone();
         let cfg = self.config.clone();
@@ -562,6 +597,57 @@ where
         Ok(self)
     }
 
+    #[cfg(feature = "rustls-0_21")]
+    fn listen_rustls_0_21_inner(
+        mut self,
+        lst: net::TcpListener,
+        config: actix_tls::accept::rustls_0_21::reexports::ServerConfig,
+    ) -> io::Result<Self> {
+        let factory = self.factory.clone();
+        let cfg = self.config.clone();
+        let addr = lst.local_addr().unwrap();
+        self.sockets.push(Socket {
+            addr,
+            scheme: "https",
+        });
+
+        let on_connect_fn = self.on_connect_fn.clone();
+
+        self.builder =
+            self.builder
+                .listen(format!("actix-web-service-{}", addr), lst, move || {
+                    let c = cfg.lock().unwrap();
+                    let host = c.host.clone().unwrap_or_else(|| format!("{}", addr));
+
+                    let svc = HttpService::build()
+                        .keep_alive(c.keep_alive)
+                        .client_request_timeout(c.client_request_timeout)
+                        .client_disconnect_timeout(c.client_disconnect_timeout);
+
+                    let svc = if let Some(handler) = on_connect_fn.clone() {
+                        svc.on_connect_ext(move |io: &_, ext: _| (handler)(io as &dyn Any, ext))
+                    } else {
+                        svc
+                    };
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
+                    let acceptor_config = match c.tls_handshake_timeout {
+                        Some(dur) => TlsAcceptorConfig::default().handshake_timeout(dur),
+                        None => TlsAcceptorConfig::default(),
+                    };
+
+                    svc.finish(map_config(fac, move |_| {
+                        AppConfig::new(true, host.clone(), addr)
+                    }))
+                    .rustls_021_with_config(config.clone(), acceptor_config)
+                })?;
+
+        Ok(self)
+    }
+
     /// Binds to existing listener for accepting incoming TLS connection requests using OpenSSL.
     ///
     /// See [`listen()`](Self::listen) for more details on the `lst` argument.
diff --git a/actix-web/tests/test_server.rs b/actix-web/tests/test_server.rs
index 8ce889396..a268cb6e3 100644
--- a/actix-web/tests/test_server.rs
+++ b/actix-web/tests/test_server.rs
@@ -1,6 +1,6 @@
 #[cfg(feature = "openssl")]
 extern crate tls_openssl as openssl;
-#[cfg(feature = "rustls")]
+#[cfg(feature = "rustls-0_21")]
 extern crate tls_rustls as rustls;
 
 use std::{
@@ -704,7 +704,7 @@ async fn test_brotli_encoding_large_openssl() {
     srv.stop().await;
 }
 
-#[cfg(feature = "rustls")]
+#[cfg(feature = "rustls-0_21")]
 mod plus_rustls {
     use std::io::BufReader;
 
@@ -743,7 +743,7 @@ mod plus_rustls {
             .map(char::from)
             .collect::<String>();
 
-        let srv = actix_test::start_with(actix_test::config().rustls(tls_config()), || {
+        let srv = actix_test::start_with(actix_test::config().rustls_021(tls_config()), || {
             App::new().service(web::resource("/").route(web::to(|bytes: Bytes| async {
                 // echo decompressed request body back in response
                 HttpResponse::Ok()
diff --git a/awc/CHANGES.md b/awc/CHANGES.md
index 3429a84d7..c998cd97a 100644
--- a/awc/CHANGES.md
+++ b/awc/CHANGES.md
@@ -2,6 +2,8 @@
 
 ## Unreleased - 2023-xx-xx
 
+- Add `awc::Connector::rustls_021()` method for Rustls v0.21 support behind new `rustls-0_21` crate feature.
+- Add `rustls-0_20` crate feature, which the existing `rustls` feature now aliases.
 - Minimum supported Rust version (MSRV) is now 1.68 due to transitive `time` dependency.
 
 ## 3.1.1 - 2023-02-26
diff --git a/awc/Cargo.toml b/awc/Cargo.toml
index 2a09a52c4..67d6b06f5 100644
--- a/awc/Cargo.toml
+++ b/awc/Cargo.toml
@@ -21,16 +21,20 @@ path = "src/lib.rs"
 
 [package.metadata.docs.rs]
 # features that docs.rs will build with
-features = ["openssl", "rustls", "compress-brotli", "compress-gzip", "compress-zstd", "cookies"]
+features = ["openssl", "rustls-0_20", "rustls-0_21", "compress-brotli", "compress-gzip", "compress-zstd", "cookies"]
 
 [features]
 default = ["compress-brotli", "compress-gzip", "compress-zstd", "cookies"]
 
-# openssl
+# TLS via OpenSSL
 openssl = ["tls-openssl", "actix-tls/openssl"]
 
-# rustls
-rustls = ["tls-rustls", "actix-tls/rustls"]
+# TLS via Rustls v0.20
+rustls = ["rustls-0_20"]
+# TLS via Rustls v0.20
+rustls-0_20 = ["tls-rustls-0_20", "actix-tls/rustls-0_20"]
+# TLS via Rustls v0.21
+rustls-0_21 = ["tls-rustls-0_21", "actix-tls/rustls-0_21"]
 
 # Brotli algorithm content-encoding support
 compress-brotli = ["actix-http/compress-brotli", "__compress"]
@@ -39,10 +43,10 @@ compress-gzip = ["actix-http/compress-gzip", "__compress"]
 # Zstd algorithm content-encoding support
 compress-zstd = ["actix-http/compress-zstd", "__compress"]
 
-# cookie parsing and cookie jar
+# Cookie parsing and cookie jar
 cookies = ["cookie"]
 
-# trust-dns as dns resolver
+# Use `trust-dns-resolver` crate as DNS resolver
 trust-dns = ["trust-dns-resolver"]
 
 # Internal (PRIVATE!) features used to aid testing and checking feature status.
@@ -59,7 +63,7 @@ actix-codec = "0.5"
 actix-service = "2"
 actix-http = { version = "3.3", features = ["http2", "ws"] }
 actix-rt = { version = "2.1", default-features = false }
-actix-tls = { version = "3", features = ["connect", "uri"] }
+actix-tls = { version = "3.1", features = ["connect", "uri"] }
 actix-utils = "3"
 
 base64 = "0.21"
@@ -84,7 +88,8 @@ tokio = { version = "1.24.2", features = ["sync"] }
 cookie = { version = "0.16", features = ["percent-encode"], optional = true }
 
 tls-openssl = { package = "openssl", version = "0.10.55", optional = true }
-tls-rustls = { package = "rustls", version = "0.20", optional = true, features = ["dangerous_configuration"] }
+tls-rustls-0_20 = { package = "rustls", version = "0.20", optional = true, features = ["dangerous_configuration"] }
+tls-rustls-0_21 = { package = "rustls", version = "0.21", optional = true, features = ["dangerous_configuration"] }
 
 trust-dns-resolver = { version = "0.22", optional = true }
 
@@ -92,8 +97,8 @@ trust-dns-resolver = { version = "0.22", optional = true }
 actix-http = { version = "3", features = ["openssl"] }
 actix-http-test = { version = "3", features = ["openssl"] }
 actix-server = "2"
-actix-test = { version = "0.1", features = ["openssl", "rustls"] }
-actix-tls = { version = "3", features = ["openssl", "rustls"] }
+actix-test = { version = "0.1", features = ["openssl", "rustls-0_21"] }
+actix-tls = { version = "3", features = ["openssl", "rustls-0_21"] }
 actix-utils = "3"
 actix-web = { version = "4", features = ["openssl"] }
 
@@ -110,4 +115,4 @@ zstd = "0.12"
 
 [[example]]
 name = "client"
-required-features = ["rustls"]
+required-features = ["rustls-0_21"]
diff --git a/awc/src/client/connector.rs b/awc/src/client/connector.rs
index 1ecaf9947..538b64ffd 100644
--- a/awc/src/client/connector.rs
+++ b/awc/src/client/connector.rs
@@ -43,20 +43,22 @@ enum OurTlsConnector {
     #[allow(dead_code)] // false positive; used in build_ssl
     OpensslBuilder(actix_tls::connect::openssl::reexports::SslConnectorBuilder),
 
-    #[cfg(feature = "rustls")]
-    Rustls(std::sync::Arc<actix_tls::connect::rustls::reexports::ClientConfig>),
+    #[cfg(feature = "rustls-0_20")]
+    Rustls020(std::sync::Arc<actix_tls::connect::rustls_0_20::reexports::ClientConfig>),
+
+    #[cfg(feature = "rustls-0_21")]
+    Rustls021(std::sync::Arc<actix_tls::connect::rustls_0_21::reexports::ClientConfig>),
 }
 
 /// Manages HTTP client network connectivity.
 ///
-/// The `Connector` type uses a builder-like combinator pattern for service
-/// construction that finishes by calling the `.finish()` method.
+/// The `Connector` type uses a builder-like combinator pattern for service construction that
+/// finishes by calling the `.finish()` method.
 ///
-/// ```ignore
+/// ```no_run
 /// use std::time::Duration;
-/// use actix_http::client::Connector;
 ///
-/// let connector = Connector::new()
+/// let connector = awc::Connector::new()
 ///      .timeout(Duration::from_secs(5))
 ///      .finish();
 /// ```
@@ -80,22 +82,22 @@ impl Connector<()> {
         Connector {
             connector: TcpConnector::new(resolver::resolver()).service(),
             config: ConnectorConfig::default(),
-            tls: Self::build_ssl(vec![b"h2".to_vec(), b"http/1.1".to_vec()]),
+            tls: Self::build_tls(vec![b"h2".to_vec(), b"http/1.1".to_vec()]),
         }
     }
 
     /// Provides an empty TLS connector when no TLS feature is enabled.
-    #[cfg(not(any(feature = "openssl", feature = "rustls")))]
-    fn build_ssl(_: Vec<Vec<u8>>) -> OurTlsConnector {
+    #[cfg(not(any(feature = "openssl", feature = "rustls-0_20", feature = "rustls-0_21")))]
+    fn build_tls(_: Vec<Vec<u8>>) -> OurTlsConnector {
         OurTlsConnector::None
     }
 
-    /// Build TLS connector with rustls, based on supplied ALPN protocols
+    /// Build TLS connector with Rustls v0.21, based on supplied ALPN protocols
     ///
-    /// Note that if both `openssl` and `rustls` features are enabled, rustls will be used.
-    #[cfg(feature = "rustls")]
-    fn build_ssl(protocols: Vec<Vec<u8>>) -> OurTlsConnector {
-        use actix_tls::connect::rustls::{reexports::ClientConfig, webpki_roots_cert_store};
+    /// Note that if other TLS crate features are enabled, Rustls v0.21 will be used.
+    #[cfg(feature = "rustls-0_21")]
+    fn build_tls(protocols: Vec<Vec<u8>>) -> OurTlsConnector {
+        use actix_tls::connect::rustls_0_21::{reexports::ClientConfig, webpki_roots_cert_store};
 
         let mut config = ClientConfig::builder()
             .with_safe_defaults()
@@ -104,12 +106,55 @@ impl Connector<()> {
 
         config.alpn_protocols = protocols;
 
-        OurTlsConnector::Rustls(std::sync::Arc::new(config))
+        OurTlsConnector::Rustls021(std::sync::Arc::new(config))
     }
 
-    /// Build TLS connector with openssl, based on supplied ALPN protocols
-    #[cfg(all(feature = "openssl", not(feature = "rustls")))]
-    fn build_ssl(protocols: Vec<Vec<u8>>) -> OurTlsConnector {
+    /// Build TLS connector with Rustls v0.21, based on supplied ALPN protocols
+    ///
+    /// Note that if other TLS crate features are enabled, Rustls v0.21 will be used.
+    #[cfg(all(
+        all(feature = "rustls-0_20", feature = "openssl"),
+        not(feature = "rustls-0_21"),
+    ))]
+    fn build_tls(protocols: Vec<Vec<u8>>) -> OurTlsConnector {
+        use actix_tls::connect::rustls_0_20::{reexports::ClientConfig, webpki_roots_cert_store};
+
+        let mut config = ClientConfig::builder()
+            .with_safe_defaults()
+            .with_root_certificates(webpki_roots_cert_store())
+            .with_no_client_auth();
+
+        config.alpn_protocols = protocols;
+
+        OurTlsConnector::Rustls020(std::sync::Arc::new(config))
+    }
+
+    /// Build TLS connector with Rustls v0.20, based on supplied ALPN protocols
+    ///
+    /// Note that if other TLS crate features are enabled, Rustls v0.21 will be used.
+    #[cfg(all(
+        feature = "rustls-0_20",
+        not(any(feature = "rustls-0_21", feature = "openssl")),
+    ))]
+    fn build_tls(protocols: Vec<Vec<u8>>) -> OurTlsConnector {
+        use actix_tls::connect::rustls_0_20::{reexports::ClientConfig, webpki_roots_cert_store};
+
+        let mut config = ClientConfig::builder()
+            .with_safe_defaults()
+            .with_root_certificates(webpki_roots_cert_store())
+            .with_no_client_auth();
+
+        config.alpn_protocols = protocols;
+
+        OurTlsConnector::Rustls020(std::sync::Arc::new(config))
+    }
+
+    /// Build TLS connector with OpenSSL, based on supplied ALPN protocols
+    #[cfg(all(
+        feature = "openssl",
+        not(any(feature = "rustls-0_20", feature = "rustls-0_21")),
+    ))]
+    fn build_tls(protocols: Vec<Vec<u8>>) -> OurTlsConnector {
         use actix_tls::connect::openssl::reexports::{SslConnector, SslMethod};
         use bytes::{BufMut, BytesMut};
 
@@ -129,7 +174,7 @@ impl Connector<()> {
 }
 
 impl<S> Connector<S> {
-    /// Use custom connector.
+    /// Sets custom connector.
     pub fn connector<S1, Io1>(self, connector: S1) -> Connector<S1>
     where
         Io1: ActixStream + fmt::Debug + 'static,
@@ -158,21 +203,28 @@ where
         + Clone
         + 'static,
 {
-    /// Tcp connection timeout, i.e. max time to connect to remote host including dns name
-    /// resolution. Set to 5 second by default.
+    /// Sets TCP connection timeout.
+    ///
+    /// This is the max time allowed to connect to remote host, including DNS name resolution.
+    ///
+    /// By default, the timeout is 5 seconds.
     pub fn timeout(mut self, timeout: Duration) -> Self {
         self.config.timeout = timeout;
         self
     }
 
-    /// Tls handshake timeout, i.e. max time to do tls handshake with remote host after tcp
-    /// connection established. Set to 5 second by default.
+    /// Sets TLS handshake timeout.
+    ///
+    /// This is the max time allowed to perform the TLS handshake with remote host after TCP
+    /// connection is established.
+    ///
+    /// By default, the timeout is 5 seconds.
     pub fn handshake_timeout(mut self, timeout: Duration) -> Self {
         self.config.handshake_timeout = timeout;
         self
     }
 
-    /// Use custom OpenSSL `SslConnector` instance.
+    /// Sets custom OpenSSL `SslConnector` instance.
     #[cfg(feature = "openssl")]
     pub fn openssl(
         mut self,
@@ -191,13 +243,23 @@ where
         self
     }
 
-    /// Use custom Rustls `ClientConfig` instance.
-    #[cfg(feature = "rustls")]
+    /// Sets custom Rustls v0.20 `ClientConfig` instance.
+    #[cfg(feature = "rustls-0_20")]
     pub fn rustls(
         mut self,
-        connector: std::sync::Arc<actix_tls::connect::rustls::reexports::ClientConfig>,
+        connector: std::sync::Arc<actix_tls::connect::rustls_0_20::reexports::ClientConfig>,
     ) -> Self {
-        self.tls = OurTlsConnector::Rustls(connector);
+        self.tls = OurTlsConnector::Rustls020(connector);
+        self
+    }
+
+    /// Sets custom Rustls v0.21 `ClientConfig` instance.
+    #[cfg(feature = "rustls-0_21")]
+    pub fn rustls_021(
+        mut self,
+        connector: std::sync::Arc<actix_tls::connect::rustls_0_21::reexports::ClientConfig>,
+    ) -> Self {
+        self.tls = OurTlsConnector::Rustls021(connector);
         self
     }
 
@@ -212,12 +274,12 @@ where
                 unimplemented!("actix-http client only supports versions http/1.1 & http/2")
             }
         };
-        self.tls = Connector::build_ssl(versions);
+        self.tls = Connector::build_tls(versions);
         self
     }
 
-    /// Sets the initial window size (in octets) for HTTP/2 stream-level flow control for
-    /// received data.
+    /// Sets the initial window size (in bytes) for HTTP/2 stream-level flow control for received
+    /// data.
     ///
     /// The default value is 65,535 and is good for APIs, but not for big objects.
     pub fn initial_window_size(mut self, size: u32) -> Self {
@@ -225,7 +287,7 @@ where
         self
     }
 
-    /// Sets the initial window size (in octets) for HTTP/2 connection-level flow control for
+    /// Sets the initial window size (in bytes) for HTTP/2 connection-level flow control for
     /// received data.
     ///
     /// The default value is 65,535 and is good for APIs, but not for big objects.
@@ -405,11 +467,44 @@ where
                 unreachable!("OpenSSL builder is built before this match.");
             }
 
-            #[cfg(feature = "rustls")]
-            OurTlsConnector::Rustls(tls) => {
+            #[cfg(feature = "rustls-0_20")]
+            OurTlsConnector::Rustls020(tls) => {
                 const H2: &[u8] = b"h2";
 
-                use actix_tls::connect::rustls::{reexports::AsyncTlsStream, TlsConnector};
+                use actix_tls::connect::rustls_0_20::{reexports::AsyncTlsStream, TlsConnector};
+
+                impl<Io: ConnectionIo> IntoConnectionIo for TcpConnection<Uri, AsyncTlsStream<Io>> {
+                    fn into_connection_io(self) -> (Box<dyn ConnectionIo>, Protocol) {
+                        let sock = self.into_parts().0;
+                        let h2 = sock
+                            .get_ref()
+                            .1
+                            .alpn_protocol()
+                            .map_or(false, |protos| protos.windows(2).any(|w| w == H2));
+                        if h2 {
+                            (Box::new(sock), Protocol::Http2)
+                        } else {
+                            (Box::new(sock), Protocol::Http1)
+                        }
+                    }
+                }
+
+                let handshake_timeout = self.config.handshake_timeout;
+
+                let tls_service = TlsConnectorService {
+                    tcp_service: tcp_service_inner,
+                    tls_service: TlsConnector::service(tls),
+                    timeout: handshake_timeout,
+                };
+
+                Some(actix_service::boxed::rc_service(tls_service))
+            }
+
+            #[cfg(feature = "rustls-0_21")]
+            OurTlsConnector::Rustls021(tls) => {
+                const H2: &[u8] = b"h2";
+
+                use actix_tls::connect::rustls_0_21::{reexports::AsyncTlsStream, TlsConnector};
 
                 impl<Io: ConnectionIo> IntoConnectionIo for TcpConnection<Uri, AsyncTlsStream<Io>> {
                     fn into_connection_io(self) -> (Box<dyn ConnectionIo>, Protocol) {
diff --git a/awc/tests/test_rustls_client.rs b/awc/tests/test_rustls_client.rs
index 652997de6..d758f93d8 100644
--- a/awc/tests/test_rustls_client.rs
+++ b/awc/tests/test_rustls_client.rs
@@ -1,6 +1,6 @@
-#![cfg(feature = "rustls")]
+#![cfg(feature = "rustls-0_21")]
 
-extern crate tls_rustls as rustls;
+extern crate tls_rustls_0_21 as rustls;
 
 use std::{
     io::BufReader,
@@ -14,7 +14,7 @@ use std::{
 use actix_http::HttpService;
 use actix_http_test::test_server;
 use actix_service::{fn_service, map_config, ServiceFactoryExt};
-use actix_tls::connect::rustls::webpki_roots_cert_store;
+use actix_tls::connect::rustls_0_21::webpki_roots_cert_store;
 use actix_utils::future::ok;
 use actix_web::{dev::AppConfig, http::Version, web, App, HttpResponse};
 use rustls::{
@@ -82,7 +82,7 @@ async fn test_connection_reuse_h2() {
                     App::new().service(web::resource("/").route(web::to(HttpResponse::Ok))),
                     |_| AppConfig::default(),
                 ))
-                .rustls(tls_config())
+                .rustls_021(tls_config())
                 .map_err(|_| ()),
         )
     })
@@ -102,7 +102,7 @@ async fn test_connection_reuse_h2() {
         .set_certificate_verifier(Arc::new(danger::NoCertificateVerification));
 
     let client = awc::Client::builder()
-        .connector(awc::Connector::new().rustls(Arc::new(config)))
+        .connector(awc::Connector::new().rustls_021(Arc::new(config)))
         .finish();
 
     // req 1