Normalize array-valued Swoole request headers

src/Http/Adapter/Swoole/Request.php

@@ -3,6 +3,7 @@
 namespace Utopia\Http\Adapter\Swoole;
 
 use Swoole\Http\Request as SwooleRequest;
+use Stringable;
 use Utopia\Http\Request as UtopiaRequest;
 
 class Request extends UtopiaRequest
@@ -287,7 +288,9 @@ public function getCookie(string $key, string $default = ''): string
      */
     public function getHeader(string $key, string $default = ''): string
     {
-        return $this->swoole->header[$key] ?? $default;
+        $key = strtolower($key);
+
+        return $this->normalizeHeaderValue($this->swoole->header[$key] ?? $default, $default);
     }
 
     /**
@@ -324,6 +327,27 @@ public function getSwooleRequest(): SwooleRequest
         return $this->swoole;
     }
 
+    private function normalizeHeaderValue(mixed $value, string $default): string
+    {
+        if (is_array($value)) {
+            for ($i = count($value) - 1; $i >= 0; $i--) {
+                $candidate = $value[$i];
+
+                if (is_scalar($candidate) || $candidate instanceof Stringable) {
+                    return (string) $candidate;
+                }
+            }
+
+            return $default;
+        }
+
+        if (is_scalar($value) || $value instanceof Stringable) {
+            return (string) $value;
+        }
+
+        return $default;
+    }
+
     /**
      * Generate input
      *

tests/SwooleRequestTest.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Utopia\Http\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Utopia\Http\Adapter\Swoole\Request;
+
+class SwooleRequestTest extends TestCase
+{
+    private ?Request $request = null;
+
+    public function setUp(): void
+    {
+        if (!class_exists(\Swoole\Http\Request::class)) {
+            $this->markTestSkipped('The Swoole extension is required for this test.');
+        }
+
+        /** @var \Swoole\Http\Request $swooleRequest */
+        $swooleRequest = new \Swoole\Http\Request();
+        $swooleRequest->header = [];
+
+        $this->request = new Request($swooleRequest);
+    }
+
+    public function tearDown(): void
+    {
+        $this->request = null;
+    }
+
+    public function testCanGetScalarHeaders(): void
+    {
+        $this->request?->getSwooleRequest()->header = [
+            'x-replaced-path' => '/gateway',
+        ];
+
+        $this->assertEquals('/gateway', $this->request?->getHeader('x-replaced-path'));
+    }
+
+    public function testCanNormalizeArrayHeaders(): void
+    {
+        $this->request?->getSwooleRequest()->header = [
+            'x-replaced-path' => ['/client', '/gateway'],
+        ];
+
+        $this->assertEquals('/gateway', $this->request?->getHeader('x-replaced-path'));
+    }
+}