fix: do not corrupt streamed response bodies

src/Drivers/LaravelHttpServer.php

@@ -300,9 +300,10 @@ private function handleRequest(AmpRequest $request): Response
                 ob_start();
                 $response->sendContent();
             } finally {
-                // @phpstan-ignore-next-line
-                $content = mb_trim(ob_get_clean());
+                $buffer = ob_get_clean();
             }
+
+            $content = $buffer === false ? '' : $buffer;
         }
 
         return new Response(

tests/Browser/StreamedResponseTest.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Support\Facades\Route;
+use Symfony\Component\HttpFoundation\StreamedResponse;
+
+it('may serve a binary streamed response without corrupting its bytes', function (): void {
+    $bytes = "\x20\x0A\xFF\xD8\xFF\xE0PAYLOAD-1234567890\xFF\x00\x0A\x20";
+
+    Route::get('/', fn (): string => '<div>Home</div>');
+    Route::get('/binary', fn (): StreamedResponse => response()->stream(
+        function () use ($bytes): void {
+            echo $bytes;
+        },
+        200,
+        ['Content-Type' => 'image/jpeg'],
+    ));
+
+    $page = visit('/');
+
+    $page->assertScript(
+        "async () => {
+            const response = await fetch('/binary');
+            const bytes = new Uint8Array(await response.arrayBuffer());
+
+            return Array.from(bytes).join(',');
+        }",
+        implode(',', unpack('C*', $bytes)),
+    );
+});
+
+it('may serve a binary streamed image that the browser is able to decode', function (): void {
+    $image = file_get_contents(__DIR__.'/../Fixtures/v4.jpg');
+
+    Route::get('/', fn (): string => '<img id="image" src="/image" alt="Streamed Image">');
+    Route::get('/image', fn (): StreamedResponse => response()->stream(
+        function () use ($image): void {
+            echo $image;
+        },
+        200,
+        ['Content-Type' => 'image/jpeg'],
+    ));
+
+    $page = visit('/');
+
+    $page->assertScript("document.getElementById('image').complete && document.getElementById('image').naturalWidth > 0");
+});
+
+it('may serve a textual streamed response without altering its whitespace', function (): void {
+    Route::get('/', fn (): string => '<div>Home</div>');
+    Route::get('/text', fn (): StreamedResponse => response()->stream(
+        function (): void {
+            echo "\n  Hello World  \n";
+        },
+        200,
+        ['Content-Type' => 'text/plain'],
+    ));
+
+    $page = visit('/');
+
+    $page->assertScript(
+        "async () => JSON.stringify(await (await fetch('/text')).text())",
+        json_encode("\n  Hello World  \n"),
+    );
+});