diff --git a/canhttp/src/client/mod.rs b/canhttp/src/client/mod.rs
index 4cdf326..aeb14c3 100644
--- a/canhttp/src/client/mod.rs
+++ b/canhttp/src/client/mod.rs
@@ -178,6 +178,34 @@ impl TransformContextRequestExtension for IcHttpRequest {
     }
 }
 
+/// Add support for selecting replicated or non-replicated HTTP outcalls.
+///
+/// Warning: non-replicated outcalls are currently experimental.
+/// See the [docs](https://docs.internetcomputer.org/references/ic-interface-spec/#ic-http_request) for more ditails.
+pub trait IsReplicatedRequestExtension: Sized {
+    /// Set the request replication mode.
+    fn set_is_replicated(&mut self, value: bool);
+
+    /// Returns the replication mode of the request, if explicitly set.
+    fn get_is_replicated(&self) -> Option<bool>;
+
+    /// Sets the replication mode using the builder pattern.
+    fn replicated(mut self, value: bool) -> Self {
+        self.set_is_replicated(value);
+        self
+    }
+}
+
+impl IsReplicatedRequestExtension for IcHttpRequest {
+    fn set_is_replicated(&mut self, value: bool) {
+        self.is_replicated = Some(value);
+    }
+
+    fn get_is_replicated(&self) -> Option<bool> {
+        self.is_replicated
+    }
+}
+
 /// Characterize errors that are specific to HTTPs outcalls.
 pub trait HttpsOutcallError {
     /// Determines whether the error indicates that the response was larger than the specified
diff --git a/canhttp/src/http/request.rs b/canhttp/src/http/request.rs
index c295fa6..d0d1676 100644
--- a/canhttp/src/http/request.rs
+++ b/canhttp/src/http/request.rs
@@ -1,5 +1,8 @@
 use crate::convert::Convert;
-use crate::{MaxResponseBytesRequestExtension, TransformContextRequestExtension};
+use crate::{
+    IsReplicatedRequestExtension, MaxResponseBytesRequestExtension,
+    TransformContextRequestExtension,
+};
 use ic_cdk::management_canister::{
     HttpHeader as IcHttpHeader, HttpMethod as IcHttpMethod, HttpRequestArgs as IcHttpRequest,
     TransformContext,
@@ -67,6 +70,35 @@ impl TransformContextRequestExtension for http::request::Builder {
     }
 }
 
+#[derive(Clone, Debug, PartialEq, Eq)]
+struct IsReplicatedExtension(pub bool);
+
+impl<T> IsReplicatedRequestExtension for http::Request<T> {
+    fn set_is_replicated(&mut self, value: bool) {
+        let extensions = self.extensions_mut();
+        extensions.insert(IsReplicatedExtension(value));
+    }
+
+    fn get_is_replicated(&self) -> Option<bool> {
+        self.extensions()
+            .get::<IsReplicatedExtension>()
+            .map(|e| e.0)
+    }
+}
+
+impl IsReplicatedRequestExtension for http::request::Builder {
+    fn set_is_replicated(&mut self, value: bool) {
+        if let Some(extensions) = self.extensions_mut() {
+            extensions.insert(IsReplicatedExtension(value));
+        }
+    }
+
+    fn get_is_replicated(&self) -> Option<bool> {
+        self.extensions_ref()
+            .and_then(|extensions| extensions.get::<IsReplicatedExtension>().map(|e| e.0))
+    }
+}
+
 /// Error return when converting requests with [`HttpRequestConverter`].
 #[derive(Error, Clone, Debug, Eq, PartialEq)]
 pub enum HttpRequestConversionError {
@@ -119,6 +151,7 @@ impl Convert<HttpRequest> for HttpRequestConverter {
             })
             .collect::<Result<Vec<_>, _>>()?;
         let transform = request.get_transform_context().cloned();
+        let is_replicated = request.get_is_replicated();
         let body = Some(request.into_body());
         Ok(IcHttpRequest {
             url,
@@ -127,7 +160,7 @@ impl Convert<HttpRequest> for HttpRequestConverter {
             headers,
             body,
             transform,
-            is_replicated: None,
+            is_replicated,
         })
     }
 }
diff --git a/canhttp/src/http/tests.rs b/canhttp/src/http/tests.rs
index e10071f..10413d6 100644
--- a/canhttp/src/http/tests.rs
+++ b/canhttp/src/http/tests.rs
@@ -4,7 +4,7 @@ use crate::{
         response::{HttpResponse, HttpResponseConversionError},
         HttpConversionLayer, HttpRequestConverter, HttpResponseConverter,
     },
-    ConvertServiceBuilder, IcError, MaxResponseBytesRequestExtension,
+    ConvertServiceBuilder, IcError, IsReplicatedRequestExtension, MaxResponseBytesRequestExtension,
     TransformContextRequestExtension,
 };
 use assert_matches::assert_matches;
@@ -27,6 +27,7 @@ async fn should_convert_http_request() {
         function: TransformFunc::new(Principal::management_canister(), "sanitize".to_string()),
         context: vec![35_u8; 20],
     };
+    let is_replicated = true;
     let body = vec![42_u8; 32];
 
     let mut service = ServiceBuilder::new()
@@ -41,6 +42,7 @@ async fn should_convert_http_request() {
         let request = request_builder
             .max_response_bytes(max_response_bytes)
             .transform_context(transform_context.clone())
+            .replicated(is_replicated)
             .header("Content-Type", "application/json")
             .body(body.clone())
             .unwrap();
@@ -59,12 +61,31 @@ async fn should_convert_http_request() {
                 }],
                 body: Some(body.clone()),
                 transform: Some(transform_context.clone()),
-                is_replicated: None,
+                is_replicated: Some(is_replicated),
             }
         )
     }
 }
 
+#[tokio::test]
+async fn should_convert_is_replicated_flag() {
+    let url = "https://internetcomputer.org/";
+    let mut service = ServiceBuilder::new()
+        .convert_request(HttpRequestConverter)
+        .service_fn(echo_request);
+
+    for is_replicated in [true, false] {
+        let request = http::Request::get(url)
+            .replicated(is_replicated)
+            .body(vec![])
+            .unwrap();
+
+        let converted_request = service.ready().await.unwrap().call(request).await.unwrap();
+
+        assert_eq!(converted_request.is_replicated, Some(is_replicated));
+    }
+}
+
 #[tokio::test]
 async fn should_fail_when_http_method_unsupported() {
     let mut service = ServiceBuilder::new()
@@ -186,10 +207,12 @@ async fn should_convert_both_request_and_responses() {
         function: TransformFunc::new(Principal::management_canister(), "sanitize".to_string()),
         context: vec![35_u8; 20],
     };
+    let is_replicated = false;
     let body = vec![42_u8; 32];
     let request = http::Request::post(url)
         .max_response_bytes(max_response_bytes)
         .transform_context(transform_context.clone())
+        .replicated(is_replicated)
         .header("Content-Type", "application/json")
         .body(body.clone())
         .unwrap();
@@ -209,7 +232,7 @@ async fn should_convert_both_request_and_responses() {
             }],
             body: Some(body.clone()),
             transform: Some(transform_context.clone()),
-            is_replicated: None,
+            is_replicated: Some(is_replicated),
         }
     );
 
diff --git a/canhttp/src/lib.rs b/canhttp/src/lib.rs
index 8641b26..4432714 100644
--- a/canhttp/src/lib.rs
+++ b/canhttp/src/lib.rs
@@ -6,8 +6,8 @@
 #![forbid(missing_docs)]
 
 pub use client::{
-    Client, HttpsOutcallError, IcError, MaxResponseBytesRequestExtension,
-    TransformContextRequestExtension,
+    Client, HttpsOutcallError, IcError, IsReplicatedRequestExtension,
+    MaxResponseBytesRequestExtension, TransformContextRequestExtension,
 };
 pub use convert::ConvertServiceBuilder;