From a7f76bba35a7d603961bfa6fb374472cb8e952c2 Mon Sep 17 00:00:00 2001
From: Rene Reimann <rr@zammad.com>
Date: Tue, 8 Sep 2026 21:19:46 +0200
Subject: [PATCH] Fix: send Accept: application/json header on all requests
 (#157)

---
 src/Core/Transport/RequestHandler.php |  3 ++-
 test/Unit/Core/RequestHandlerTest.php | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/Core/Transport/RequestHandler.php b/src/Core/Transport/RequestHandler.php
index bfe2d72..e84791b 100644
--- a/src/Core/Transport/RequestHandler.php
+++ b/src/Core/Transport/RequestHandler.php
@@ -217,7 +217,8 @@ private function dispatch(string $method, string $uri, array $options): Response
         $this->logger->debug("Zammad API request: {$method} {$fullUri}");
 
         try {
-            $request = $this->requestFactory->createRequest($method, $fullUri);
+            $request = $this->requestFactory->createRequest($method, $fullUri)
+                ->withHeader('Accept', 'application/json');
 
             if (isset($options['headers']) && is_array($options['headers'])) {
                 foreach ($options['headers'] as $name => $value) {
diff --git a/test/Unit/Core/RequestHandlerTest.php b/test/Unit/Core/RequestHandlerTest.php
index ad9030a..94c1318 100644
--- a/test/Unit/Core/RequestHandlerTest.php
+++ b/test/Unit/Core/RequestHandlerTest.php
@@ -167,6 +167,26 @@ public function testGetLastResponseReturnsLastResponseAfterRequest(): void
         self::assertNotNull($this->handler->getLastResponse());
     }
 
+    public function testRequestsSendAcceptJsonHeader(): void
+    {
+        $this->httpClient->response = new Response(200, [], '{}');
+
+        $this->handler->get('tickets');
+
+        self::assertNotNull($this->httpClient->lastRequest);
+        self::assertSame('application/json', $this->httpClient->lastRequest->getHeaderLine('Accept'));
+    }
+
+    public function testRequestsSendAcceptJsonHeaderOnPost(): void
+    {
+        $this->httpClient->response = new Response(201, [], '{}');
+
+        $this->handler->post('tickets', ['title' => 'x']);
+
+        self::assertNotNull($this->httpClient->lastRequest);
+        self::assertSame('application/json', $this->httpClient->lastRequest->getHeaderLine('Accept'));
+    }
+
     public function testGetRawWithQueryParamsAppendsToUri(): void
     {
         $this->httpClient->response = new Response(200, [], 'binary');