diff --git a/examples/http_proxy.rs b/examples/http_proxy.rs
index a08bdc4a29..5911a2dbe8 100644
--- a/examples/http_proxy.rs
+++ b/examples/http_proxy.rs
@@ -23,14 +23,21 @@ type HttpClient = Client<hyper::client::HttpConnector>;
 #[tokio::main]
 async fn main() {
     let addr = SocketAddr::from(([127, 0, 0, 1], 8100));
-    let client = HttpClient::new();
+
+    let client = Client::builder()
+        .http1_title_case_headers(true)
+        .http1_preserve_header_case(true)
+        .build_http();
 
     let make_service = make_service_fn(move |_| {
         let client = client.clone();
         async move { Ok::<_, Infallible>(service_fn(move |req| proxy(client.clone(), req))) }
     });
 
-    let server = Server::bind(&addr).serve(make_service);
+    let server = Server::bind(&addr)
+        .http1_preserve_header_case(true)
+        .http1_title_case_headers(true)
+        .serve(make_service);
 
     println!("Listening on http://{}", addr);
 
diff --git a/src/server/conn.rs b/src/server/conn.rs
index 0cef9d5e78..c1a52f1c0d 100644
--- a/src/server/conn.rs
+++ b/src/server/conn.rs
@@ -89,6 +89,7 @@ pub struct Http<E = Exec> {
     h1_half_close: bool,
     h1_keep_alive: bool,
     h1_title_case_headers: bool,
+    h1_preserve_header_case: bool,
     #[cfg(feature = "http2")]
     h2_builder: proto::h2::server::Config,
     mode: ConnectionMode,
@@ -236,6 +237,7 @@ impl Http {
             h1_half_close: false,
             h1_keep_alive: true,
             h1_title_case_headers: false,
+            h1_preserve_header_case: false,
             #[cfg(feature = "http2")]
             h2_builder: Default::default(),
             mode: ConnectionMode::default(),
@@ -301,6 +303,19 @@ impl<E> Http<E> {
         self
     }
 
+    /// Set whether HTTP/1 connections will write header names as provided
+    /// at the socket level.
+    ///
+    /// Note that this setting does not affect HTTP/2.
+    ///
+    /// Default is false.
+    #[cfg(feature = "http1")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
+    pub fn http1_preserve_header_case(&mut self, enabled: bool) -> &mut Self {
+        self.h1_preserve_header_case = enabled;
+        self
+    }
+
     /// Sets whether HTTP2 is required.
     ///
     /// Default is false
@@ -475,6 +490,7 @@ impl<E> Http<E> {
             h1_half_close: self.h1_half_close,
             h1_keep_alive: self.h1_keep_alive,
             h1_title_case_headers: self.h1_title_case_headers,
+            h1_preserve_header_case: self.h1_preserve_header_case,
             #[cfg(feature = "http2")]
             h2_builder: self.h2_builder,
             mode: self.mode,
@@ -533,6 +549,9 @@ impl<E> Http<E> {
                 if self.h1_title_case_headers {
                     conn.set_title_case_headers();
                 }
+                if self.h1_preserve_header_case {
+                    conn.set_preserve_header_case();
+                }
                 conn.set_flush_pipeline(self.pipeline_flush);
                 if let Some(max) = self.max_buf_size {
                     conn.set_max_buf_size(max);
diff --git a/src/server/server.rs b/src/server/server.rs
index 3fa949162c..20c993e8ac 100644
--- a/src/server/server.rs
+++ b/src/server/server.rs
@@ -244,6 +244,19 @@ impl<I, E> Builder<I, E> {
         self
     }
 
+    /// Set whether HTTP/1 connections will write header names as provided
+    /// at the socket level.
+    ///
+    /// Note that this setting does not affect HTTP/2.
+    ///
+    /// Default is false.
+    #[cfg(feature = "http1")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
+    pub fn http1_preserve_header_case(mut self, val: bool) -> Self {
+        self.protocol.http1_preserve_header_case(val);
+        self
+    }
+
     /// Sets whether HTTP/1 is required.
     ///
     /// Default is `false`.