Haproxy not preserving data http data while redirection

[lukastribus]

I assume this is the same problem as in:

API ares Not reachable through Haproxy

It depends how your API client behaves. An API client is not a browser. Check your logs, see if the client follows the redirect and if it still is the same request (or whether it downgraded a POST to a GET request).

Please provide configuration and logs, because it is really hard to understand what’s going on.