Guest API WebSocket connection drop on /messages send

Just noticed that the custom UI drops the WebSocket connection immediately after sending a message via POST to /api/v2/conversations/messaging/external/contacts/{contactId}/messages. The handshake on wss://webchat.{org}.mypurecloud.com/api/v2/conversations/messaging/external/contacts is successful, and I receive the initial greeting. However, upon sending a JSON payload with to and text fields, the server returns a 1000 Close code. No error message is broadcast on the socket. Is the contactId in the POST URL required to match the session ID from the handshake, or should I be using a different endpoint for outbound messages in a pure Guest API implementation?

Oh, this is a known issue with the guest token expiry. the websocket drops because the token used for the handshake expires before the message is processed, triggering a 1000 close. you need to refresh the token via POST /api/v2/conversations/messaging/external/contacts/{contactId}/messages with a new expires_in claim before sending.

Yep, this is a known issue with the guest token expiry. the websocket drops because the token used for the handshake expires before the message is processed, triggering a 1000 close. you need to refresh the token via POST /api/v2/conversations/messaging/external/contacts/{contactId}/messages with a new expires_in claim before sending.

To fix this easily, this is to implement a proactive token renewal mechanism within your WebSocket handler. The 1000 close code often indicates that the server-side validation of the guest token fails due to expiry or scope mismatch during the message commit. You should not wait for the error. Instead, monitor the token’s expires_in value. When it drops below a threshold, issue a POST to /api/v2/conversations/messaging/external/contacts/{contactId}/messages with a minimal payload to refresh the session context before attempting the actual message send.

In Rust, you can manage this with a background tokio::time::interval that checks the token status. Ensure your WebSocket client re-authenticates using the new token if the connection is dropped unexpectedly.

let token_expiry = Duration::from_secs(token.expires_in - 30);
tokio::time::sleep(token_expiry).await;
// Trigger token refresh logic here before sending message

Note: Ensure your API client handles the 401 Unauthorized response gracefully to avoid infinite loops during the refresh process.

The problem here is relying on client-side timing for token renewal in a serverless environment. SvelteKit server routes are stateless and ephemeral. If you try to manage expires_in logic in the browser, race conditions will kill your WebSocket. The suggestion above about refreshing via POST is technically correct but misses the architectural reality of a lightweight widget. You need a proxy.

1. Create a SvelteKit +server.js route for /api/genesys/refresh.
2. Use the @genesys/cloud SDK in the server environment to validate the current token.
3. If expires_in < 300, call POST /api/v2/oauth/token with your service account credentials to get a fresh access token.
4. Return this new token to the client.
5. The client should only send the WebSocket handshake when it holds a valid token.

This avoids exposing your client secret in the browser. Do not try to parse JWTs in the client. It is insecure and brittle.

// src/routes/api/genesys/refresh/+server.js
import { json } from '@sveltejs/kit';
import { PlatformClient } from '@genesys/cloud';

export async function POST() {
 const client = PlatformClient.create();
 // Assume server-side OAuth2 flow is already configured in env
 const token = await client.auth.getAccessToken();
 
 if (!token || token.expires_in < 300) {
 // Trigger silent refresh via SDK
 await client.auth.login('oauth2', {
 grant_type: 'client_credentials',
 client_id: process.env.GC_CLIENT_ID,
 client_secret: process.env.GC_CLIENT_SECRET
 });
 }
 
 return json({ token: client.auth.getAccessToken().access_token });
}

Stop fighting the browser’s network stack. Push the auth logic to the server. It is cleaner and more reliable.