diff --git a/ehttp/Cargo.toml b/ehttp/Cargo.toml
index 38caf46..f150f72 100644
--- a/ehttp/Cargo.toml
+++ b/ehttp/Cargo.toml
@@ -74,6 +74,7 @@ web-sys = { version = "0.3.52", features = [
   "Request",
   "RequestInit",
   "RequestMode",
+  "RequestCredentials",
   "Response",
   "Window",
 ] }
diff --git a/ehttp/src/lib.rs b/ehttp/src/lib.rs
index 550b96e..6e3d62d 100644
--- a/ehttp/src/lib.rs
+++ b/ehttp/src/lib.rs
@@ -77,6 +77,8 @@ pub use types::{Error, Headers, PartialResponse, Request, Response, Result};
 
 #[cfg(target_arch = "wasm32")]
 pub use types::Mode;
+#[cfg(target_arch = "wasm32")]
+pub use types::Credentials;
 
 #[cfg(not(target_arch = "wasm32"))]
 mod native;
diff --git a/ehttp/src/types.rs b/ehttp/src/types.rs
index 86b4557..e9020d3 100644
--- a/ehttp/src/types.rs
+++ b/ehttp/src/types.rs
@@ -126,6 +126,35 @@ impl From<Mode> for web_sys::RequestMode {
     }
 }
 
+// ----------------------------------------------------------------------------
+
+/// Determines whether or not the browser sends credentials with the request, as well as whether any Set-Cookie response headers are respected.
+///
+/// Based on <https://developer.mozilla.org/en-US/docs/Web/API/Request/credentials>
+#[derive(Default, Clone, Copy, Debug)]
+pub enum Credentials {
+    /// Never send credentials in the request or include credentials in the response.
+    #[default]
+    Omit = 0,
+
+    /// Only send and include credentials for same-origin requests.
+    SameOrigin = 1,
+
+    /// Always include credentials, even for cross-origin requests.
+    Include = 2,
+}
+
+#[cfg(target_arch = "wasm32")]
+impl From<Credentials> for web_sys::RequestCredentials {
+    fn from(credentials: Credentials) -> Self {
+        match credentials {
+            Credentials::Omit => web_sys::RequestCredentials::Omit,
+            Credentials::SameOrigin => web_sys::RequestCredentials::SameOrigin,
+            Credentials::Include => web_sys::RequestCredentials::Include,
+        }
+    }
+}
+
 /// A simple HTTP request.
 #[derive(Clone, Debug)]
 pub struct Request {
@@ -144,7 +173,14 @@ pub struct Request {
     /// Request mode used on fetch.
     ///
     /// Used on Web to control CORS.
+    #[cfg(target_arch = "wasm32")]
     pub mode: Mode,
+
+    /// Credential options for fetch.
+    ///
+    /// Only applies to the web backend.
+    #[cfg(target_arch = "wasm32")]
+    pub credentials: Credentials,
 }
 
 impl Request {
@@ -156,7 +192,10 @@ impl Request {
             url: url.to_string(),
             body: vec![],
             headers: Headers::new(&[("Accept", "*/*")]),
+            #[cfg(target_arch = "wasm32")]
             mode: Mode::default(),
+            #[cfg(target_arch = "wasm32")]
+            credentials: Credentials::default(),
         }
     }
 
@@ -168,7 +207,10 @@ impl Request {
             url: url.to_string(),
             body: vec![],
             headers: Headers::new(&[("Accept", "*/*")]),
+            #[cfg(target_arch = "wasm32")]
             mode: Mode::default(),
+            #[cfg(target_arch = "wasm32")]
+            credentials: Credentials::default(),
         }
     }
 
@@ -183,7 +225,10 @@ impl Request {
                 ("Accept", "*/*"),
                 ("Content-Type", "text/plain; charset=utf-8"),
             ]),
+            #[cfg(target_arch = "wasm32")]
             mode: Mode::default(),
+            #[cfg(target_arch = "wasm32")]
+            credentials: Credentials::default(),
         }
     }
 
@@ -217,7 +262,10 @@ impl Request {
             url: url.to_string(),
             body: data,
             headers: Headers::new(&[("Accept", "*/*"), ("Content-Type", content_type.as_str())]),
+            #[cfg(target_arch = "wasm32")]
             mode: Mode::default(),
+            #[cfg(target_arch = "wasm32")]
+            credentials: Credentials::default(),
         }
     }
 
@@ -233,7 +281,10 @@ impl Request {
             url: url.to_string(),
             body: serde_json::to_string(body)?.into_bytes(),
             headers: Headers::new(&[("Accept", "*/*"), ("Content-Type", "application/json")]),
+            #[cfg(target_arch = "wasm32")]
             mode: Mode::default(),
+            #[cfg(target_arch = "wasm32")]
+            credentials: Credentials::default(),
         })
     }
 }
diff --git a/ehttp/src/web.rs b/ehttp/src/web.rs
index cb7d4c3..00ea3cf 100644
--- a/ehttp/src/web.rs
+++ b/ehttp/src/web.rs
@@ -43,6 +43,7 @@ pub(crate) async fn fetch_base(request: &Request) -> Result<web_sys::Response, J
     let mut opts = web_sys::RequestInit::new();
     opts.method(&request.method);
     opts.mode(request.mode.into());
+    opts.credentials(request.credentials.into());
 
     if !request.body.is_empty() {
         let body_bytes: &[u8] = &request.body;