diff --git a/examples/ext-soap-transport.php b/examples/ext-soap-transport.php
new file mode 100644
index 0000000..d2b1bf2
--- /dev/null
+++ b/examples/ext-soap-transport.php
@@ -0,0 +1,29 @@
+<?php
+
+use Soap\Engine\SimpleEngine;
+use Soap\ExtSoapEngine\AbusedClient;
+use Soap\ExtSoapEngine\ExtSoapDriver;
+use Soap\ExtSoapEngine\ExtSoapOptions;
+use Soap\ExtSoapEngine\Transport\ExtSoapClientTransport;
+use Soap\ExtSoapEngine\Transport\TraceableTransport;
+
+require_once dirname(__DIR__).'/vendor/autoload.php';
+
+$engine = new SimpleEngine(
+    ExtSoapDriver::createFromClient(
+        $client = AbusedClient::createFromOptions(
+            ExtSoapOptions::defaults('http://www.dneonline.com/calculator.asmx?wsdl', [
+                'connection_timeout' => 0,
+            ])
+        )
+    ),
+    $transport = new TraceableTransport(
+        $client,
+        new ExtSoapClientTransport($client)
+    )
+);
+
+$result = $engine->request('Add', [['intA' => 1, 'intB' => 2]]);
+
+var_dump($result);
+var_dump($transport->collectLastRequestInfo());
diff --git a/src/AbusedClient.php b/src/AbusedClient.php
index a8437b3..94fdaaf 100644
--- a/src/AbusedClient.php
+++ b/src/AbusedClient.php
@@ -63,7 +63,7 @@ public function doActualRequest(
         bool $oneWay = false
     ): string {
         $this->__last_request = $request;
-        $this->__last_response = parent::__doRequest($request, $location, $action, $version, $oneWay);
+        $this->__last_response = (string) parent::__doRequest($request, $location, $action, $version, $oneWay);
 
         return $this->__last_response;
     }
diff --git a/stubs/SoapClient.phpstub b/stubs/SoapClient.phpstub
index 250db4a..e74d67a 100644
--- a/stubs/SoapClient.phpstub
+++ b/stubs/SoapClient.phpstub
@@ -7,5 +7,5 @@ class SoapClient
      * @see https://github.com/vimeo/psalm/issues/6901
      * This can be removed once it is fixed in psalm
      */
-    public function __doRequest (string $request, string $location, string $action, int $version, bool $one_way = false) {}
+    public function __doRequest (string $request, string $location, string $action, int $version, bool $one_way = false): ?string {}
 }