Accept json when posting heartbeat

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - **BREAKING**: Require Laravel 11.
 - **BREAKING**: Camel case keys in response.
+- Accept json when posting heartbeat.
 
 ### Added
 - **BREAKING**: Enum `ResultState`.

src/Heartbeat.php

@@ -33,6 +33,7 @@ public function send(string $slug, int $minutes = 1): void
         } else {
             Http::withToken(config('butler.health.heartbeat.token'))
                 ->timeout(5)
+                ->acceptJson()
                 ->post($url)
                 ->onError(function ($response) {
                     report($response->toException());

tests/HeartbeatTest.php

@@ -20,6 +20,8 @@ public function test_send_happy_path()
 
         Http::assertSent(fn (Request $request)
             => $request->method() === 'POST'
+            && $request->isJson()
+            && $request->hasHeader('Accept', 'application/json')
             && $request->hasHeader('Authorization', 'Bearer secret')
             && $request->url() === 'http://localhost/foobar/2');
     }