HAProxy possible to use "dynamic" header?

[DonZalmrol]

Hi,

I'm fine tuning my HAProxy settings for additional security through removing and adding headers.

One of such headers is the X-Powered-By header

I wonder if its possible to dynamically add the the domain name or URL the end-user is connecting with, I work with multiple domains so it should reflect.

E.g.:

rspadd X-Powered-By:\ dynamicSiteURLHere

Or

rspadd X-Powered-By:\ dynamicDomainNameHere

Lastly I have one header that I can't seem to get working

rspadd X-Content-Security-Policy:\ default-src: 'self';\ img-src:*;\ media-src:*;\ data:*;

not working on 'self', tried 'self' and other combinations.

Thanks in advance!

[DonZalmrol]

Nobody? :)