✨ **Middleware & Tests:** Improved exception handling for stale Livewire asset requests to return 404 instead of 500. Added feature tests to validate these scenarios. 🚀

tests/Feature/LivewireStaleAssetTest.php

@@ -0,0 +1,63 @@
+<?php
+
+use Livewire\Mechanisms\HandleRequests\EndpointResolver;
+
+it('returns 404 for stale livewire css module urls instead of 500', function () {
+    $prefix = EndpointResolver::prefix();
+
+    $response = $this->get($prefix.'/css/meetups--landingpage.css?v=1502173559');
+
+    $response->assertNotFound();
+});
+
+it('returns 404 for stale livewire global css module urls', function () {
+    $prefix = EndpointResolver::prefix();
+
+    $response = $this->get($prefix.'/css/meetups--landingpage.global.css?v=1');
+
+    $response->assertNotFound();
+});
+
+it('returns 404 for stale livewire js module urls', function () {
+    $prefix = EndpointResolver::prefix();
+
+    $response = $this->get($prefix.'/js/meetups--landingpage.js?v=1');
+
+    $response->assertNotFound();
+});
+
+it('still serves css for components that do have a style source', function () {
+    $componentName = '__staletest_with_style_'.bin2hex(random_bytes(4));
+    $bladePath = resource_path('views/livewire/'.$componentName.'.blade.php');
+
+    file_put_contents($bladePath, <<<'BLADE'
+        <?php
+
+        use Livewire\Component;
+
+        new class extends Component {
+            public function render(): string
+            {
+                return '<div>test</div>';
+            }
+        }; ?>
+
+        <div>test</div>
+        <style>
+        .foo { color: red; }
+        </style>
+        BLADE
+    );
+
+    try {
+        $prefix = EndpointResolver::prefix();
+
+        $response = $this->get($prefix.'/css/'.$componentName.'.css');
+
+        $response->assertSuccessful();
+        $response->assertHeader('content-type', 'text/css; charset=utf-8');
+        expect($response->getContent())->toContain('.foo')->toContain('color: red');
+    } finally {
+        @unlink($bladePath);
+    }
+});