Hey folks,
I’m running into a bit of a weird problem. My HAProxy HTTP healthchecks are receiving a 403 forbidden error:
Provided Host header is not whitelisted
This is despite regular curls from the same HAProxy box going through fine, with all of the same request parameters (as far as I can tell from tcpdump): user-agent, path, host. Furthermore, if I force the backend as being alive and curl it via HAProxy, those requests are also going through fine with a 200 OK.
Kind of at a loss here. The requests seem exactly identical on TCPdump, but the ones that are health checks receive 403 while all other, identical requests get a 200 OK.
Does anyone have any clues here?
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