symfony
diff --git a/‎src/Symfony/Component/Notifier/Bridge/Slack/SlackTransport.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Notifier/Bridge/Slack/SlackTransport.php
+3Lines changed: 3 additions & 0 deletions b/‎src/Symfony/Component/Notifier/Bridge/Slack/SlackTransport.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Notifier/Bridge/Slack/SlackTransport.php
+3Lines changed: 3 additions & 0 deletions
@@ -80,6 +80,9 @@ protected function doSend(MessageInterface $message): SentMessage
         $response = $this->client->request('POST', 'https://'.$this->getEndpoint().'/api/chat.postMessage', [
             'json' => array_filter($options),
             'auth_bearer' => $this->accessToken,
+            'headers' => [
+                'content-type' => 'application/json; charset=utf-8',
+            ],
         ]);
 
         if (200 !== $response->getStatusCode()) {