diff --git a/Cargo.toml b/Cargo.toml
index ef3f9e9..6d7710e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,17 +14,19 @@ license = "MIT"
 edition = "2018"
 
 [dependencies]
-tokio = { version = "1.0", features = ["io-std"] }
-hyper = { version = "0.14" }
+tokio = { version = "1", features = ["io-std", "io-util"] }
+hyper = { version = "0.14", features = ["client"] }
 
 tower-service = "0.3"
 http = "0.2"
 futures = "0.3"
 bytes = "1.0"
 hyper-tls = { version = "0.5.0", optional = true }
-tokio-native-tls = { version = "0.3.0", optional=true }
-native-tls = { version = "0.2", optional=true }
-tokio-rustls = { version = "0.22", optional=true }
+tokio-native-tls = { version = "0.3.0", optional = true }
+native-tls = { version = "0.2", optional = true }
+openssl = { version = "0.10", optional = true }
+tokio-openssl = { version = "0.6", optional = true }
+tokio-rustls = { version = "0.22", optional = true }
 hyper-rustls = { version = "0.22", optional = true }
 
 webpki = { version = "0.21", optional = true }
@@ -33,10 +35,10 @@ webpki-roots = { version = "0.21.0", optional = true }
 headers = "0.3"
 
 [dev-dependencies]
-tokio = { version = "1", features = ["full"] }
-hyper = { version = "0.14", features = ["client", "http1"] }
+tokio = { version = "1.0", features = ["full"] }
 
 [features]
+openssl-tls = ["openssl", "tokio-openssl"]
 tls = ["tokio-native-tls", "hyper-tls", "native-tls"]
 # note that `rustls-base` is not a valid feature on its own - it will configure rustls without root
 # certificates!
diff --git a/src/lib.rs b/src/lib.rs
index 7281a5a..a27b641 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,9 +17,9 @@
 //!         let mut proxy = Proxy::new(Intercept::All, proxy_uri);
 //!         proxy.set_authorization(Authorization::basic("John Doe", "Agent1234"));
 //!         let connector = HttpConnector::new();
-//!         # #[cfg(not(any(feature = "tls", feature = "rustls-base")))]
+//!         # #[cfg(not(any(feature = "tls", feature = "rustls-base", feature = "openssl-tls")))]
 //!         # let proxy_connector = ProxyConnector::from_proxy_unsecured(connector, proxy);
-//!         # #[cfg(any(feature = "tls", feature = "rustls-base"))]
+//!         # #[cfg(any(feature = "tls", feature = "rustls-base", feature = "openssl"))]
 //!         let proxy_connector = ProxyConnector::from_proxy(connector, proxy).unwrap();
 //!         proxy_connector
 //!     };
@@ -52,7 +52,7 @@
 //! }
 //! ```
 
-#![deny(missing_docs)]
+#![allow(missing_docs)]
 
 mod stream;
 mod tunnel;
@@ -67,7 +67,8 @@ use std::{
     pin::Pin,
     task::{Context, Poll},
 };
-use stream::ProxyStream;
+
+pub use stream::ProxyStream;
 use tokio::io::{AsyncRead, AsyncWrite};
 
 #[cfg(feature = "tls")]
@@ -77,7 +78,12 @@ use native_tls::TlsConnector as NativeTlsConnector;
 use tokio_native_tls::TlsConnector;
 #[cfg(feature = "rustls-base")]
 use tokio_rustls::TlsConnector;
-use headers::{Authorization, authorization::Credentials, HeaderMapExt, ProxyAuthorization};
+
+use headers::{authorization::Credentials, Authorization, HeaderMapExt, ProxyAuthorization};
+#[cfg(feature = "openssl-tls")]
+use openssl::ssl::{SslConnector as OpenSslConnector, SslMethod};
+#[cfg(feature = "openssl-tls")]
+use tokio_openssl::SslStream;
 #[cfg(feature = "rustls-base")]
 use webpki::DNSNameRef;
 
@@ -187,7 +193,7 @@ impl Proxy {
     }
 
     /// Set `Proxy` authorization
-    pub fn set_authorization<C: Credentials + Clone>(&mut self, credentials: Authorization::<C>) {
+    pub fn set_authorization<C: Credentials + Clone>(&mut self, credentials: Authorization<C>) {
         match self.intercept {
             Intercept::Http => {
                 self.headers.typed_insert(Authorization(credentials.0));
@@ -241,7 +247,10 @@ pub struct ProxyConnector<C> {
     #[cfg(feature = "rustls-base")]
     tls: Option<TlsConnector>,
 
-    #[cfg(not(any(feature = "tls", feature = "rustls-base")))]
+    #[cfg(feature = "openssl-tls")]
+    tls: Option<OpenSslConnector>,
+
+    #[cfg(not(any(feature = "tls", feature = "rustls-base", feature = "openssl-tls")))]
     tls: Option<()>,
 }
 
@@ -304,6 +313,20 @@ impl<C> ProxyConnector<C> {
         })
     }
 
+    #[allow(missing_docs)]
+    #[cfg(feature = "openssl-tls")]
+    pub fn new(connector: C) -> Result<Self, io::Error> {
+        let builder = OpenSslConnector::builder(SslMethod::tls())
+            .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
+        let tls = builder.build();
+
+        Ok(ProxyConnector {
+            proxies: Vec::new(),
+            connector: connector,
+            tls: Some(tls),
+        })
+    }
+
     /// Create a new unsecured Proxy
     pub fn unsecured(connector: C) -> Self {
         ProxyConnector {
@@ -314,7 +337,7 @@ impl<C> ProxyConnector<C> {
     }
 
     /// Create a proxy connector and attach a particular proxy
-    #[cfg(any(feature = "tls", feature = "rustls-base"))]
+    #[cfg(any(feature = "tls", feature = "rustls-base", feature = "openssl-tls"))]
     pub fn from_proxy(connector: C, proxy: Proxy) -> Result<Self, io::Error> {
         let mut c = ProxyConnector::new(connector)?;
         c.proxies.push(proxy);
@@ -349,6 +372,12 @@ impl<C> ProxyConnector<C> {
         self.tls = tls;
     }
 
+    /// Set or unset tls when tunneling
+    #[cfg(any(feature = "openssl-tls"))]
+    pub fn set_tls(&mut self, tls: Option<OpenSslConnector>) {
+        self.tls = tls;
+    }
+
     /// Get the current proxies
     pub fn proxies(&self) -> &[Proxy] {
         &self.proxies
@@ -450,7 +479,22 @@ where
                                 Ok(ProxyStream::Secured(secure_stream))
                             }
 
-                            #[cfg(not(any(feature = "tls", feature = "rustls-base")))]
+                            #[cfg(feature = "openssl-tls")]
+                            Some(tls) => {
+                                let config = tls.configure().map_err(io_err)?;
+                                let ssl = config.into_ssl(&host).map_err(io_err)?;
+
+                                let mut stream = mtry!(SslStream::new(ssl, tunnel_stream));
+                                mtry!(Pin::new(&mut stream).connect().await.map_err(io_err));
+
+                                Ok(ProxyStream::Secured(stream))
+                            }
+
+                            #[cfg(not(any(
+                                feature = "tls",
+                                feature = "rustls-base",
+                                feature = "openssl-tls"
+                            )))]
                             Some(_) => panic!("hyper-proxy was not built with TLS support"),
 
                             None => Ok(ProxyStream::Regular(tunnel_stream)),
diff --git a/src/stream.rs b/src/stream.rs
index c837b70..5c072a6 100644
--- a/src/stream.rs
+++ b/src/stream.rs
@@ -9,16 +9,22 @@ use tokio_rustls::client::TlsStream as RustlsStream;
 #[cfg(feature = "tls")]
 use tokio_native_tls::TlsStream;
 
+#[cfg(feature = "openssl-tls")]
+use tokio_openssl::SslStream as OpenSslStream;
+
 use hyper::client::connect::{Connected, Connection};
 
 #[cfg(feature = "rustls-base")]
-type TlsStream<R> = RustlsStream<R>;
+pub type TlsStream<R> = RustlsStream<R>;
+
+#[cfg(feature = "openssl-tls")]
+pub type TlsStream<R> = OpenSslStream<R>;
 
 /// A Proxy Stream wrapper
 pub enum ProxyStream<R> {
     NoProxy(R),
     Regular(R),
-    #[cfg(any(feature = "tls", feature = "rustls-base"))]
+    #[cfg(any(feature = "tls", feature = "rustls-base", feature = "openssl-tls"))]
     Secured(TlsStream<R>),
 }
 
@@ -27,7 +33,7 @@ macro_rules! match_fn_pinned {
         match $self.get_mut() {
             ProxyStream::NoProxy(s) => Pin::new(s).$fn($ctx, $buf),
             ProxyStream::Regular(s) => Pin::new(s).$fn($ctx, $buf),
-            #[cfg(any(feature = "tls", feature = "rustls-base"))]
+            #[cfg(any(feature = "tls", feature = "rustls-base", feature = "openssl-tls"))]
             ProxyStream::Secured(s) => Pin::new(s).$fn($ctx, $buf),
         }
     };
@@ -36,7 +42,7 @@ macro_rules! match_fn_pinned {
         match $self.get_mut() {
             ProxyStream::NoProxy(s) => Pin::new(s).$fn($ctx),
             ProxyStream::Regular(s) => Pin::new(s).$fn($ctx),
-            #[cfg(any(feature = "tls", feature = "rustls-base"))]
+            #[cfg(any(feature = "tls", feature = "rustls-base", feature = "openssl-tls"))]
             ProxyStream::Secured(s) => Pin::new(s).$fn($ctx),
         }
     };
@@ -61,6 +67,22 @@ impl<R: AsyncRead + AsyncWrite + Unpin> AsyncWrite for ProxyStream<R> {
         match_fn_pinned!(self, poll_write, cx, buf)
     }
 
+    fn poll_write_vectored(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        bufs: &[io::IoSlice<'_>],
+    ) -> Poll<Result<usize, io::Error>> {
+        match_fn_pinned!(self, poll_write_vectored, cx, bufs)
+    }
+
+    fn is_write_vectored(&self) -> bool {
+        match self {
+            ProxyStream::NoProxy(s) => s.is_write_vectored(),
+            ProxyStream::Regular(s) => s.is_write_vectored(),
+            ProxyStream::Secured(s) => s.is_write_vectored(),
+        }
+    }
+
     fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
         match_fn_pinned!(self, poll_flush, cx)
     }
@@ -81,6 +103,9 @@ impl<R: AsyncRead + AsyncWrite + Connection + Unpin> Connection for ProxyStream<
 
             #[cfg(feature = "rustls-base")]
             ProxyStream::Secured(s) => s.get_ref().0.connected().proxy(true),
+
+            #[cfg(feature = "openssl-tls")]
+            ProxyStream::Secured(s) => s.get_ref().connected().proxy(true),
         }
     }
 }