Proxy in k8s: short DNS name not resolved properly

[ocervell]

I am running a Privoxy proxy and a client using httpx within kubernetes, trying to have httpx use that proxy when making requests.

Full DNS name
Running with the full k8s DNS name tor-privoxy.default.svc.cluster.local works:

$ httpx -silent -u https://www.google.com -proxy http://tor-privoxy.default.svc.cluster.local:8118
https://www.google.com [Google Web Server,HSTS,HTTP/3]

Service reduced DNS name
Running with the reduced k8s DNS name tor-privoxy as proxy doesn't seem to work (no results):

$ httpx -silent -u https://www.google.com -json -proxy http://tor-privoxy:8118

Seems like httpx's DNS resolution doesn't work all the way but I'm not getting any error from the output. Name resolution using nslookup does work:

$ nslookup tor-privoxy
Server:         10.96.0.10
Address:        10.96.0.10#53

Name:   tor-privoxy.default.svc.cluster.local
Address: 10.110.18.226

Service IP
Running with the proxy's IP works fine as well:

$ httpx -silent -u https://www.google.com -json -proxy http://10.110.18.226:8118
https://www.google.com [HTTP/3]

The resolv.conf on k8s is like:

cat /etc/resolv.conf 
nameserver 10.96.0.10
search default.svc.cluster.local svc.cluster.local cluster.local mshome.net
options ndots:5

I wasn't sure if the resolvers flag (-r) worked for proxy DNS, but I've tried passing it -r 10.96.0.10 to no effect: are we bypassing default system DNS resolution ?