diff --git a/Userland/Libraries/LibProtocol/WebSocketClient.cpp b/Userland/Libraries/LibProtocol/WebSocketClient.cpp
index 457e18d7114..652bec081fd 100644
--- a/Userland/Libraries/LibProtocol/WebSocketClient.cpp
+++ b/Userland/Libraries/LibProtocol/WebSocketClient.cpp
@@ -16,10 +16,10 @@ WebSocketClient::WebSocketClient(NonnullOwnPtr<Core::LocalSocket> socket)
 
 RefPtr<WebSocket> WebSocketClient::connect(const URL& url, DeprecatedString const& origin, Vector<DeprecatedString> const& protocols, Vector<DeprecatedString> const& extensions, HashMap<DeprecatedString, DeprecatedString> const& request_headers)
 {
-    IPC::Dictionary header_dictionary;
-    for (auto& it : request_headers)
-        header_dictionary.add(it.key, it.value);
-    auto connection_id = IPCProxy::connect(url, origin, protocols, extensions, header_dictionary);
+    auto headers_or_error = request_headers.clone();
+    if (headers_or_error.is_error())
+        return nullptr;
+    auto connection_id = IPCProxy::connect(url, origin, protocols, extensions, headers_or_error.release_value());
     if (connection_id < 0)
         return nullptr;
     auto connection = WebSocket::create_from_id({}, *this, connection_id);
diff --git a/Userland/Services/WebSocket/ConnectionFromClient.cpp b/Userland/Services/WebSocket/ConnectionFromClient.cpp
index 4d02d62ce45..c679d867fe5 100644
--- a/Userland/Services/WebSocket/ConnectionFromClient.cpp
+++ b/Userland/Services/WebSocket/ConnectionFromClient.cpp
@@ -27,7 +27,7 @@ void ConnectionFromClient::die()
 }
 
 Messages::WebSocketServer::ConnectResponse ConnectionFromClient::connect(URL const& url, DeprecatedString const& origin,
-    Vector<DeprecatedString> const& protocols, Vector<DeprecatedString> const& extensions, IPC::Dictionary const& additional_request_headers)
+    Vector<DeprecatedString> const& protocols, Vector<DeprecatedString> const& extensions, HashMap<DeprecatedString, DeprecatedString> const& additional_request_headers)
 {
     if (!url.is_valid()) {
         dbgln("WebSocket::Connect: Invalid URL requested: '{}'", url);
@@ -40,7 +40,7 @@ Messages::WebSocketServer::ConnectResponse ConnectionFromClient::connect(URL con
     connection_info.set_extensions(extensions);
 
     Vector<ConnectionInfo::Header> headers;
-    for (auto const& header : additional_request_headers.entries()) {
+    for (auto const& header : additional_request_headers) {
         headers.append({ header.key, header.value });
     }
     connection_info.set_headers(headers);
diff --git a/Userland/Services/WebSocket/ConnectionFromClient.h b/Userland/Services/WebSocket/ConnectionFromClient.h
index 14f8b9c47bd..04d77ed8bca 100644
--- a/Userland/Services/WebSocket/ConnectionFromClient.h
+++ b/Userland/Services/WebSocket/ConnectionFromClient.h
@@ -26,7 +26,7 @@ public:
 private:
     explicit ConnectionFromClient(NonnullOwnPtr<Core::LocalSocket>);
 
-    virtual Messages::WebSocketServer::ConnectResponse connect(URL const&, DeprecatedString const&, Vector<DeprecatedString> const&, Vector<DeprecatedString> const&, IPC::Dictionary const&) override;
+    virtual Messages::WebSocketServer::ConnectResponse connect(URL const&, DeprecatedString const&, Vector<DeprecatedString> const&, Vector<DeprecatedString> const&, HashMap<DeprecatedString, DeprecatedString> const&) override;
     virtual Messages::WebSocketServer::ReadyStateResponse ready_state(i32) override;
     virtual Messages::WebSocketServer::SubprotocolInUseResponse subprotocol_in_use(i32) override;
     virtual void send(i32, bool, ByteBuffer const&) override;
diff --git a/Userland/Services/WebSocket/WebSocketServer.ipc b/Userland/Services/WebSocket/WebSocketServer.ipc
index 5b5bc7aa8bc..9db54bc4277 100644
--- a/Userland/Services/WebSocket/WebSocketServer.ipc
+++ b/Userland/Services/WebSocket/WebSocketServer.ipc
@@ -3,7 +3,7 @@
 endpoint WebSocketServer
 {
     // Connection API
-    connect(URL url, DeprecatedString origin, Vector<DeprecatedString> protocols, Vector<DeprecatedString> extensions, IPC::Dictionary additional_request_headers) => (i32 connection_id)
+    connect(URL url, DeprecatedString origin, Vector<DeprecatedString> protocols, Vector<DeprecatedString> extensions, HashMap<DeprecatedString,DeprecatedString> additional_request_headers) => (i32 connection_id)
     ready_state(i32 connection_id) => (u32 ready_state)
     subprotocol_in_use(i32 connection_id) => (DeprecatedString subprotocol_in_use)
     send(i32 connection_id, bool is_text, ByteBuffer data) =|