WebSockets, HMR, and Dev Tunnels

Production reverse proxy

How you reverse-proxy depends on how you're running Postiz:

• Official Docker image (ghcr.io/gitroomhq/postiz-app): frontend and backend are bundled inside one container and exposed on a single port (5000 internally; the official compose maps it to host 4007). Your reverse proxy only needs to forward one upstream. Most users on this image don't need anything beyond standard HTTPS termination.
• Source / multi-container deployments (pnpm dev, pnpm start, or splitting frontend and backend into separate containers): frontend runs on 4200, backend on 3000, and you need to route the paths below correctly.

For the split setup, forward:

For configured examples, see Caddy, Nginx, and Traefik.

Dev behind ngrok / Cloudflared

Running next dev behind an HTTPS tunnel needs three things:

1. Bind to all interfaces

pnpm dev # binds 0.0.0.0:4200 by default in this repo
# or explicitly
pnpm --filter @postiz/frontend exec next dev -p 4200 -H 0.0.0.0

2. Allow the tunnel host in next.config

Add your tunnel hostname to the allowedDevOrigins field in apps/frontend/next.config.js (introduced in Next.js 15.x). Without this, Next.js refuses HMR connections coming through the tunnel.

const nextConfig = {
  allowedDevOrigins: ['your-subdomain.ngrok-free.app'],
  // ...
};

3. WebSockets must reach the dev server

Most tunnels support WSS out of the box. If you've put your own reverse proxy in front of the tunnel, ensure Upgrade and Connection headers pass through, without them the HMR client disconnects every few seconds.

redirectmeto: why OAuth redirects sometimes go through a third party

When FRONTEND_URL is plain HTTP, several social providers (Slack, TikTok, Threads, VK, Instagram standalone) refuse to register your redirect URI. Postiz works around this by wrapping the redirect through https://redirectmeto.com/:

https://redirectmeto.com/http://localhost:4200/integrations/social/slack

The browser hits redirectmeto, which serves an HTTPS page that immediately redirects to the HTTP target, satisfying the provider's HTTPS-only validation without needing your dev environment to have a TLS cert.

You only see this in dev. Once FRONTEND_URL is HTTPS, Postiz skips redirectmeto entirely and uses your URL directly.

If you don't want redirectmeto in the middle even in dev, terminate TLS at your tunnel (ngrok and Cloudflared both do this by default) and set FRONTEND_URL to the https:// tunnel URL.