Thanks for reviewing! Your changes look good to me. The code works, but exits with this error message:

RECEIVE: | good
FAILED:    updating test.example.org: unexpected status (HTTP/2 200 )

I'm very sorry for not noticing this in the first place. Is this why you reverted PR #702?

Is this why you reverted PR #702?

I reverted it because I was re-reading my changes and realized the bug. I did expect this PR to have problems—sorry for the hassle.

The output you posted in #709 (comment) is unexpected. It looks like curl is printing two HTTP responses. Are you using an HTTP proxy? If so, ddclient has another (independent) bug that affects more than just your PR.

Are you using an HTTP proxy?

Yes. Everything is fine, if i disable the proxy. I'll push the commit to apply the changes from PR 709.

Thanks for sticking with this. I opened #710 for the proxy issue.

Hello @Starkstromkonsument
I'm trying to use your changes to update my ipv6 address. My config looks like this:

ssl=yes \
protocol=dyndns2 \
use=if, if=eth0 \
usev6=ifv6, ifv6=eth0 \
server=dyndns.inwx.com/nic/update?myip=<ipaddr>&myipv6=<ip6addr> \

login='username', password='password' \
mySecretDomain.com

When I execute ddclient, I get the following output:

INFO:    [mySecretDomain.com]> update forced via 'force' option
INFO:    [dyndns2][mySecretDomain.com]> setting IPv4 address to 192.168.0.19
INFO:    [dyndns2][mySecretDomain.com]> setting IPv6 address to 2a02:8060:c383:b440::8307
SUCCESS: [dyndns2][mySecretDomain.com]> IPv4 address set to 192.168.0.19
SUCCESS: [dyndns2][mySecretDomain.com]> IPv6 address set to 2a02:8060:c383:b440::8307

This seems good, but when I take a look at the INWX dashboard the only thing happening is an update of the A entry to my public ipv4 IP (the on I get from my ISP). But not to 192.168.0.19 or my Ipv6 address. Unfortunately I don't find any good documentation to find out if my config is right. Could you share an example config you used with INWX and ddclient that works?
Edit: I'm using Release v4.0.0

Please change use=if, if=eth0 \ to usev4=ifv4, ifv4=eth0 \ , set protocol to inwx and try it again.

Example:

ssl=yes
usev4=ifv4, ifv4=eth0
usev6=ifv6, ifv6=eth0
protocol=inwx
login=xxx
password=xxx
xxx.example.org

Please change use=if, if=eth0 \ to usev4=ifv4, ifv4=eth0 \ , set protocol to inwx and try it again.

Example:

ssl=yes
usev4=ifv4, ifv4=eth0
usev6=ifv6, ifv6=eth0
protocol=inwx
login=xxx
password=xxx
xxx.example.org

Works like a charm, thank you very much 👍