It seems that when support was added for parsing resolv_conf directly a regression was introduced which effectively breaks anyone with ipv6 resolvers.
Regression of #3895
1. Session cookie is updated on previous attempt failure when `session-cookie-change-on-failure = true` (default value is `false`).
2. Added tests to check both cases.
3. Updated docs.
Co-Authored-By: Vladimir Grishin <yadolov@users.noreply.github.com>