CORS for Telegram Bot Webhooks: What Actually Works
Telegram bot webhooks and CORS are a weird combo, mostly because people often try to solve the wrong problem. Here’s the blunt version: Telegram does not care about CORS when delivering webhooks to your server. Browsers care about CORS. Telegram is not a browser. So if your bot backend receives webhook requests from Telegram, CORS is irrelevant for that inbound traffic. Where CORS does matter is when you put a browser app in front of your bot infrastructure and that browser tries to call your webhook endpoint, bot API proxy, status endpoint, or admin interface. ...