diff --git a/Libraries/LibWeb/HTML/WorkerAgentParent.cpp b/Libraries/LibWeb/HTML/WorkerAgentParent.cpp
index 60a2a88e7bf..446c3ad1370 100644
--- a/Libraries/LibWeb/HTML/WorkerAgentParent.cpp
+++ b/Libraries/LibWeb/HTML/WorkerAgentParent.cpp
@@ -49,10 +49,20 @@ void WorkerAgentParent::initialize(JS::Realm& realm)
     auto transport = make<IPC::Transport>(move(worker_socket));
 
     m_worker_ipc = make_ref_counted<WebWorkerClient>(move(transport));
+    setup_worker_ipc_callbacks(realm);
 
     m_worker_ipc->async_start_worker(m_url, m_worker_options.type, m_worker_options.credentials, m_worker_options.name, move(data_holder), m_outside_settings->serialize(), m_agent_type);
 }
 
+void WorkerAgentParent::setup_worker_ipc_callbacks(JS::Realm& realm)
+{
+    // NOTE: As long as WorkerAgentParent is alive, realm and m_worker_ipc will be alive.
+    m_worker_ipc->on_request_cookie = [realm = GC::RawRef { realm }](URL::URL const& url, Cookie::Source source) {
+        auto& client = Bindings::principal_host_defined_page(realm).client();
+        return client.page_did_request_cookie(url, source);
+    };
+}
+
 void WorkerAgentParent::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
diff --git a/Libraries/LibWeb/HTML/WorkerAgentParent.h b/Libraries/LibWeb/HTML/WorkerAgentParent.h
index 693bc7e12a4..987200f5288 100644
--- a/Libraries/LibWeb/HTML/WorkerAgentParent.h
+++ b/Libraries/LibWeb/HTML/WorkerAgentParent.h
@@ -31,6 +31,8 @@ protected:
     virtual void visit_edges(Cell::Visitor&) override;
 
 private:
+    void setup_worker_ipc_callbacks(JS::Realm&);
+
     WorkerOptions m_worker_options;
     Bindings::AgentType m_agent_type { Bindings::AgentType::DedicatedWorker };
     URL::URL m_url;
diff --git a/Libraries/LibWeb/Worker/WebWorkerClient.cpp b/Libraries/LibWeb/Worker/WebWorkerClient.cpp
index 1778595ff39..1ac491624a8 100644
--- a/Libraries/LibWeb/Worker/WebWorkerClient.cpp
+++ b/Libraries/LibWeb/Worker/WebWorkerClient.cpp
@@ -20,6 +20,13 @@ void WebWorkerClient::did_close_worker()
         on_worker_close();
 }
 
+Messages::WebWorkerClient::DidRequestCookieResponse WebWorkerClient::did_request_cookie(URL::URL url, Cookie::Source source)
+{
+    if (on_request_cookie)
+        return on_request_cookie(url, source);
+    return String {};
+}
+
 WebWorkerClient::WebWorkerClient(NonnullOwnPtr<IPC::Transport> transport)
     : IPC::ConnectionToServer<WebWorkerClientEndpoint, WebWorkerServerEndpoint>(*this, move(transport))
 {
diff --git a/Libraries/LibWeb/Worker/WebWorkerClient.h b/Libraries/LibWeb/Worker/WebWorkerClient.h
index ecaffd5d1f2..884c0499463 100644
--- a/Libraries/LibWeb/Worker/WebWorkerClient.h
+++ b/Libraries/LibWeb/Worker/WebWorkerClient.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <LibIPC/ConnectionToServer.h>
+#include <LibWeb/Cookie/Cookie.h>
 #include <LibWeb/Export.h>
 #include <LibWeb/Worker/WebWorkerClientEndpoint.h>
 #include <LibWeb/Worker/WebWorkerServerEndpoint.h>
@@ -22,8 +23,10 @@ public:
     explicit WebWorkerClient(NonnullOwnPtr<IPC::Transport>);
 
     virtual void did_close_worker() override;
+    virtual Messages::WebWorkerClient::DidRequestCookieResponse did_request_cookie(URL::URL, Cookie::Source) override;
 
     Function<void()> on_worker_close;
+    Function<String(URL::URL const&, Cookie::Source)> on_request_cookie;
 
     IPC::File clone_transport();
 
diff --git a/Libraries/LibWeb/Worker/WebWorkerClient.ipc b/Libraries/LibWeb/Worker/WebWorkerClient.ipc
index 4a6d849a14a..23db83cdd82 100644
--- a/Libraries/LibWeb/Worker/WebWorkerClient.ipc
+++ b/Libraries/LibWeb/Worker/WebWorkerClient.ipc
@@ -1,3 +1,7 @@
+#include <LibURL/URL.h>
+#include <LibWeb/Cookie/Cookie.h>
+
 endpoint WebWorkerClient {
     did_close_worker() =|
+    did_request_cookie(URL::URL url, Web::Cookie::Source source) => (String cookie)
 }
diff --git a/Services/WebWorker/PageHost.cpp b/Services/WebWorker/PageHost.cpp
index 048ca39aee1..c321186219a 100644
--- a/Services/WebWorker/PageHost.cpp
+++ b/Services/WebWorker/PageHost.cpp
@@ -77,6 +77,11 @@ Web::CSS::PreferredMotion PageHost::preferred_motion() const
     return Web::CSS::PreferredMotion::Auto;
 }
 
+String PageHost::page_did_request_cookie(URL::URL const& url, Web::Cookie::Source source)
+{
+    return m_client.did_request_cookie(url, source);
+}
+
 void PageHost::request_file(Web::FileRequest request)
 {
     m_client.request_file(move(request));
diff --git a/Services/WebWorker/PageHost.h b/Services/WebWorker/PageHost.h
index d4834802f9d..813895f0c9c 100644
--- a/Services/WebWorker/PageHost.h
+++ b/Services/WebWorker/PageHost.h
@@ -32,6 +32,7 @@ public:
     virtual Web::CSS::PreferredColorScheme preferred_color_scheme() const override;
     virtual Web::CSS::PreferredContrast preferred_contrast() const override;
     virtual Web::CSS::PreferredMotion preferred_motion() const override;
+    virtual String page_did_request_cookie(URL::URL const&, Web::Cookie::Source) override;
     virtual void request_file(Web::FileRequest) override;
     virtual Web::DisplayListPlayerType display_list_player_type() const override { VERIFY_NOT_REACHED(); }
     virtual bool is_headless() const override { VERIFY_NOT_REACHED(); }