If a domain has A and AAAA records, Squid seems not to try to connect the web server by IPv4 address after failing to connect by IPv6 address.

Issue

• If a domain has A and AAAA records, Squid seems not to try to connect the web server by IPv4 address after failing to connect by IPv6 address.

• Can we change squid's behavior to the following? Also, could you please tell us if you have other workaround?

• How reproducible: always

• Steps to Reproduce:
  • Client accesses the following URL via squid.
    • The domain has A and AAAA records. In other word, DNS returns A and AAAA records of the domain.
    • The web server cannot be connected by IPv6.
• Actual results:
  • Squid does not try to connect by IPv4 after being able to connect by IPv6.
• Expected results:
  • Squid tries to connect by IPv4 after IPv6.