Use haproxy to redirect when 404 from the backend

haproxy

I'm using haproxy 1.5.18 and it does SSL termination and redirect to various backends using ACLs.

I would like to redirect the user (302) to a different page if the backend returns a 404. What's the best way to do this ?

I have found a thread dating 2009 and solves the problem using rsprep. Is it still the way to do it ?

Best Answer

frontend fe
  acl not_found status 404
  http-response set-header Location https://google.com/ if not_found
  http-response set-status 302 if not_found

It seems the http-response redirect syntax worked in haproxy 1.8, but in ubuntu builds we use it fails in 1.9 in a weird manner, and doesn't work at all in 2.0.

Related Solutions

Haproxy with backend redirect

no it is not possible with haproxy, as haproxy does not cache requests nor responses and only forwards them once (you should compare it to any switch, router or firewall you may have). Some cache-enabled components might be able to do this, and I'm told that perlbal is able to do this too.

Serve 404 from HAProxy when no acls match

If you would be okay with any of the following response codes: 200, 400, 403, 405, 408, 429, 500, 502, 503, or 504.

Then you could do something like this:

frontend www
  ...
  default_backend no-match

backend no-match
  mode http
  http-request deny deny_status 400

http-request: http://cbonte.github.io/haproxy-dconv/1.7/configuration.html#4-http-request
Accepted response codes described in errorfile: http://cbonte.github.io/haproxy-dconv/1.7/configuration.html#errorfile

Best Answer

Related Solutions

Haproxy with backend redirect

Serve 404 from HAProxy when no acls match

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