Add routes to demonstrate bug.

routes/web.php

@@ -1,7 +1,92 @@
 <?php
 
+use Illuminate\Http\Client\Events\ConnectionFailed;
+use Illuminate\Http\Client\Events\ResponseReceived;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Event;
+use Illuminate\Support\Facades\Http;
 use Illuminate\Support\Facades\Route;
+use Illuminate\Support\Facades\URL;
 
 Route::get('/', function () {
     return view('welcome');
 });
+
+// This route will demonstrate a successful HTTP request.
+Route::get('/successful-http-request', function () {
+    // Not that this is how I am actually doing this event listener, this is more to demonstrate that this event is
+    // never fired.
+    // Issue in both Laravel 10 and 11.
+    Event::listen(ResponseReceived::class, function (ResponseReceived $received) {
+        // Event is never received.
+        dump($received);
+    });
+
+    $client = Http::buildClient();
+
+    // Multiple synchronous requests to check cookie persistence.
+    $res1 = Http::setClient($client)->get(URL::route('cookie-test'));
+    $res2 = Http::setClient($client)->get(URL::route('cookie-test'));
+    $res3 = Http::setClient($client)->get(URL::route('cookie-test'));
+
+    // Cookies persisted (as intended).
+    return [$res1->json('id'), $res2->json('id'), $res3->json('id')];
+});
+
+// Now lets demonstrate that this behaviour is related to the setClient() call by removing it from the requests.
+Route::get('/successful-http-request-without-shared', function () {
+    Event::listen(ResponseReceived::class, function (ResponseReceived $received) {
+        // Event is fired x3.
+        dump($received);
+    });
+
+
+    // Multiple synchronous requests to check cookie persistence.
+    $res1 = Http::get(URL::route('cookie-test'));
+    $res2 = Http::get(URL::route('cookie-test'));
+    $res3 = Http::get(URL::route('cookie-test'));
+
+    // Cookies not persisted, the problem I was trying to tackle.
+    return [$res1->json('id'), $res2->json('id'), $res3->json('id')];
+});
+
+// Demonstrate in Laravel 10, the ConnectionFailed event does not fire but does fire in Laravel 11.
+Route::get('/bad-host', function () {
+    // This works in Laravel 11, does not work in Laravel 10
+    Event::listen(ConnectionFailed::class, function (ConnectionFailed $failed) {
+        // Event is fired in Laravel 11, not in Laravel 10.
+        dump($failed);
+    });
+
+    $client = Http::buildClient();
+
+    // Assume 9999 does not exist.
+    $res1 = Http::setClient($client)->connectTimeout(1)->get('http://127.0.0.1:9999');
+    $res2 = Http::setClient($client)->connectTimeout(1)->get('http://127.0.0.1:9999');
+    $res3 = Http::setClient($client)->connectTimeout(1)->get('http://127.0.0.1:9999');
+
+    // Unreachable as an exception will be thrown before getting here.
+    return [$res1->json('id'), $res2->json('id'), $res3->json('id')];
+});
+
+// Same as above, but again, without the shared client set by setClient().
+Route::get('/bad-host-without-shared', function () {
+    // Event is fired in Laravel 11 and Laravel 10.
+    Event::listen(ConnectionFailed::class, function (ConnectionFailed $failed) {
+        // Fired x1 in Laravel 11 and Laravel 10.
+        dump($failed);
+    });
+
+    $res1 = Http::connectTimeout(1)->get('http://127.0.0.1:9999');
+    $res2 = Http::connectTimeout(1)->get('http://127.0.0.1:9999');
+    $res3 = Http::connectTimeout(1)->get('http://127.0.0.1:9999');
+
+    // Unreachable as an exception will be thrown before getting here.
+    return [$res1->json('id'), $res2->json('id'), $res3->json('id')];
+});
+
+// Ignore, just giving a method to test all in one spot.
+Route::name('cookie-test')->get('/cookie-test', function (Request $request) {
+    // Simply return the session ID.
+    return ['id' => session()->getId()];
+});