Fix #3038

src/Bridge/Symfony/Bundle/Test/Client.php

@@ -92,7 +92,7 @@ public function request(string $method, string $url, array $options = []): Respo
 
         $server = [];
         // Convert headers to a $_SERVER-like array
-        foreach ($options['headers'] as $key => $value) {
+        foreach (self::extractHeaders($options) as $key => $value) {
             if ('content-type' === $key) {
                 $server['CONTENT_TYPE'] = $value[0] ?? '';
 
@@ -212,4 +212,24 @@ public function enableReboot(): void
     {
         $this->kernelBrowser->enableReboot();
     }
+
+    /**
+     * Normalize headers depending on the symfony/http-client version being used.
+     *
+     * @return array<string, string[]>
+     */
+    private static function extractHeaders(array $options): array
+    {
+        $headers = $options['normalized_headers'] ?? $options['headers'];
+        foreach ($headers as $key => &$values) {
+            foreach ($values as &$value) {
+                $prefix = $key.':';
+                if (0 === stripos($value, $prefix)) {
+                    $value = ltrim(substr($value, \strlen($prefix)));
+                }
+            }
+        }
+
+        return $headers;
+    }
 }