.RHEL 9 introduces `Squid 5` RHEL 9 is distributed with `Squid 5.2`, a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. This release provides a number of bug fixes, security fixes, new features, and enhancements over version 4. New features: * `Squid` improves responsibility by using the Happy Eyeballs (HE) algorithm. + ** `Squid` now uses a received IP address as soon request forwarding requires it instead of waiting for all of the potential forwarding destinations to be fully resolved. ** New directives are now available: `happy_eyeballs_connect_gap`, `happy_eyeballs_connect_limit`, and `happy_eyeballs_connect_timeout` directives. ** The `dns_v4_first` directive has been removed. * `Squid` now uses the `CDN-Loop` header as a source for loop detection in Content Delivery Networks (CDN). * `Squid` introduces peering support for SSL bumping. * A new Internet Content Adaptation Protocol (ICAP) trailers feature is available, which enables ICAP agents to reliably send message metadata after the message body. Changes to configuration options: * The `mark_client_packet` configuration option has replaced `clientside_mark`. * The `shared_transient_entries_limit` configuration option has replaced `collapsed_forwarding_shared_entries_limit`. `Squid 5` is the initial version of this Application Stream, which you can install easily as an RPM package. For more information, see link:https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/deploying_web_servers_and_reverse_proxies/configuring-the-squid-caching-proxy-server_deploying-web-servers-and-reverse-proxies[Configuring the Squid caching proxy server].