diff --git a/Userland/Libraries/LibWeb/Fetch/Request.cpp b/Userland/Libraries/LibWeb/Fetch/Request.cpp
index ba64c0f4d9..78119987be 100644
--- a/Userland/Libraries/LibWeb/Fetch/Request.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Request.cpp
@@ -6,6 +6,7 @@
 
 #include <AK/URLParser.h>
 #include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/Bindings/RequestPrototype.h>
 #include <LibWeb/DOM/AbortSignal.h>
 #include <LibWeb/Fetch/Enums.h>
 #include <LibWeb/Fetch/Headers.h>
@@ -611,6 +612,13 @@ JS::NonnullGCPtr<DOM::AbortSignal> Request::signal() const
     return *m_signal;
 }
 
+// https://fetch.spec.whatwg.org/#dom-request-duplex
+Bindings::RequestDuplex Request::duplex() const
+{
+    // The duplex getter steps are to return "half".
+    return Bindings::RequestDuplex::Half;
+}
+
 // https://fetch.spec.whatwg.org/#dom-request-clone
 WebIDL::ExceptionOr<JS::NonnullGCPtr<Request>> Request::clone() const
 {
diff --git a/Userland/Libraries/LibWeb/Fetch/Request.h b/Userland/Libraries/LibWeb/Fetch/Request.h
index 03ddb2f5bc..02c2fbf7a6 100644
--- a/Userland/Libraries/LibWeb/Fetch/Request.h
+++ b/Userland/Libraries/LibWeb/Fetch/Request.h
@@ -92,6 +92,7 @@ public:
     [[nodiscard]] bool is_reload_navigation() const;
     [[nodiscard]] bool is_history_navigation() const;
     [[nodiscard]] JS::NonnullGCPtr<DOM::AbortSignal> signal() const;
+    [[nodiscard]] Bindings::RequestDuplex duplex() const;
     [[nodiscard]] WebIDL::ExceptionOr<JS::NonnullGCPtr<Request>> clone() const;
 
 private:
diff --git a/Userland/Libraries/LibWeb/Fetch/Request.idl b/Userland/Libraries/LibWeb/Fetch/Request.idl
index e0f6bb7049..232d18b394 100644
--- a/Userland/Libraries/LibWeb/Fetch/Request.idl
+++ b/Userland/Libraries/LibWeb/Fetch/Request.idl
@@ -26,6 +26,7 @@ interface Request {
     readonly attribute boolean isReloadNavigation;
     readonly attribute boolean isHistoryNavigation;
     readonly attribute AbortSignal signal;
+    readonly attribute RequestDuplex duplex;
 
     [NewObject] Request clone();
 };