Max Peintner 574dcd2a9e fix(login): host utility to provide correct host behind proxies (#10770) ...

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# Which Problems Are Solved

When deploying the login application behind proxies or using Vercel
rewrites (e.g., `zitadel.com/login` → `login-zitadel-qa.vercel.app`),
the application was using the internal rewritten host instead of the
original user-facing host. This caused several issues:

1. **Broken Password Reset Emails**: Email links contained internal
hosts like `login-zitadel-qa.vercel.app` instead of `zitadel.com`
2. **Inconsistent User Experience**: Users would see different domains
in various parts of the flow
3. **Security Concerns**: Internal infrastructure details were exposed
to end users
4. **Scattered Logic**: Host detection logic was duplicated across
multiple files with inconsistent error handling

# How the Problems Are Solved

Created comprehensive host detection utilities in `/lib/server/host.ts`
and `/lib/client/host.ts`:

**Server-side utilities:**
- `getOriginalHost()` - Returns the original user-facing host
- `getOriginalHostWithProtocol()` - Returns host with proper protocol
(http/https)

(cherry picked from commit 09d09ab337)

2025-09-30 07:12:30 +02:00

..

login

fix(login): host utility to provide correct host behind proxies (#10770)

2025-09-30 07:12:30 +02:00