Using haproxy-1.5, I have the following partial config:

    acl is_api hdr(host) -i api.example.com
    acl is_app hdr(host) -i app.example.com

Unfortunately, the above doesn't match a request that looks like:

GET / HTTP/1.1
Host: api.example.com:80

Far as I can tell, I need to do:

    acl is_api hdr(host) -i api.example.com
    acl is_api hdr(host) -i api.example.com:80
    acl is_app hdr(host) -i app.example.com
    acl is_app hdr(host) -i app.example.com:80


Is there a nicer way of doing this? Can I just tell haproxy to ignore the port in the host header?

2 Answers 2


You might be able to get this to work by checking hdr_dom (https://code.google.com/p/haproxy-docs/wiki/MatchingLayer7) instead of hdr:

acl is_api hdr_dom(host) -i api.example.com
acl is_app hdr_dom(host) -i app.example.com

Just be careful because I believe this would also match things like "otherstuff.api.example.com".

  • 1
    Depending on the use case hdr_beg may be more appropriate, it wont match on otherstuff.api.example.com. It will however match on the far less likely api.example.com.otherstuff (that hdr_dom also matches).
    – Smithamax
    Oct 25, 2017 at 1:35

To solve this problem, I've used this on the frontend:

http-request set-header host %[hdr(host),field(1,:)]

This won't match extraneous URLs and doesn't rely on a regular expression.

From https://discourse.haproxy.org/t/strip-port-in-host-header/4414/10

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