# msg="Could not retrieve CanonizedHost, rejecting "
**URL:** https://community.traefik.io/t/msg-could-not-retrieve-canonizedhost-rejecting/5651
**Category:** Traefik v2
**Tags:** file
**Created:** [April 22, 2020, 8:10pm UTC](https://community.traefik.io/t/msg-could-not-retrieve-canonizedhost-rejecting/5651 "2020-04-22T20:10:42Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Daxcor](https://community.traefik.io/u/Daxcor)
#### Post date: [April 22, 2020, 8:10pm UTC](https://community.traefik.io/t/msg-could-not-retrieve-canonizedhost-rejecting/5651/1 "2020-04-22T20:10:42Z")
time="2020-04-22T12:59:29-07:00" level=warning msg="Could not retrieve CanonizedHost, rejecting ".
What does this message mean, should I be concerned?
thanks
Brad
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### Author:  [@mekstrem](https://community.traefik.io/u/mekstrem)
#### Post date: [April 29, 2020, 8:46am UTC](https://community.traefik.io/t/msg-could-not-retrieve-canonizedhost-rejecting/5651/2 "2020-04-29T08:46:57Z")
Hi Daxcor,
Are you using a LB with health checks by any chance? I've encountered this with F5 Health Monitor that sends HTTP/1.0 requests without a host header. The accompanied URL to that message should say if the request was done with HTTP/1.0 or not. To resolve this can you either add a host header to the HTTP/1.0 request or upgrade to HTTP/1.1. This is how I've solved this.
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### Author:  [@sandroden](https://community.traefik.io/u/sandroden)
#### Post date: [July 5, 2021, 9:44pm UTC](https://community.traefik.io/t/msg-could-not-retrieve-canonizedhost-rejecting/5651/3 "2021-07-05T21:44:23Z")
I have the same problem, the LoadBalancer I'm using is from Scaleway and they don't allow me to add headers. Any hint on a different LoadBalancer that can be used to grant ha to our kubernetes cluster on prem?
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### Author:  [@daniel.tomcej](https://community.traefik.io/u/daniel.tomcej)
#### Post date: [July 6, 2021, 10:24pm UTC](https://community.traefik.io/t/msg-could-not-retrieve-canonizedhost-rejecting/5651/4 "2021-07-06T22:24:36Z")
Hello all, the message received is due to an incoming request not containing a Host header, undoubtedly due to being HTTP/1.0.
This is not a concern, and can be ignored safely. There is a PR to remove this warning for HTTP/1.9 connections:[Ignore http 1.0 request host missing errors by dtomcej · Pull Request #8252 · traefik/traefik · GitHub](https://github.com/traefik/traefik/pull/8252)
Hello @sandroden, if you are looking for on-prem LBs, you should look at MetalLB: [https://metallb.universe.tf/](https://metallb.universe.tf/)
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### Author:  [@sandroden](https://community.traefik.io/u/sandroden)
#### Post date: [July 6, 2021, 10:49pm UTC](https://community.traefik.io/t/msg-could-not-retrieve-canonizedhost-rejecting/5651/5 "2021-07-06T22:49:48Z")
Hi @daniel.tomcej
> [@daniel.tomcej](#):
>
> This is not a concern, and can be ignored safely.
this is reported by someone, my experience is different [as reported here](https://github.com/traefik/traefik/issues/5501#issuecomment-874267329)
> [@daniel.tomcej](#):
>
> if you are looking for on-prem LBs, you should look at MetalLB: [https://metallb.universe.tf/](https://metallb.universe.tf/)
If I'm correct that would not help in implementing High Availability. I think an external LaodBalancer that checks which nodes are reachable can give me more resilience. I have nodes in 2 different datacenters, on the contrary the entry point would not be under HA with metallb.