Cast a vote on a poll
POST/api/sessions/:sessionId/messages/vote-poll
Cast a vote on a poll
Request
Responses
- 200
- 400
- 404
- 409
- 501
- 503
Vote cast
Session not active, or the target message is not a poll
Poll not found in the chat’s recent history
The session is not connected — an engine exists for it but is not ready: disconnected, reconnecting, or still initializing, so the request never reached WhatsApp. Wait for ready and retry. A session that was never started answers 400 instead, and the session lifecycle routes answer 409 for a conflicting state rather than this. One window answers this while the session still reads ready: WhatsApp Web periodically reloads its own page and the engine re-injects into it — for those few seconds the answer is a 409 naming the reload; retry shortly.
Not supported on the Baileys engine
The whatsapp-web.js page connection died mid-request. The change may or may not have been applied; repeating the request is safe, since it converges on the same state.