The 2021 release included a "legacy connector" that allowed SOAP 1.1 and proprietary RPC calls to coexist with RESTful endpoints. For financial and healthcare IT teams still running XP-era backends, this was a lifeline.
For teams still operating this stack in 2026, migration is overdue. Common strategies include: wwwwebxseries 2021
There was a significant emphasis on PWAs, with workshops demonstrating how to build PWAs that offer a seamless, app-like experience to users. The benefits of PWAs, including offline capabilities, push notifications, and home screen installation, were underscored as game-changers for businesses and developers. The 2021 release included a "legacy connector" that
"The 2021 edition was a one-time experiment. The modern web is too ephemeral, too obfuscated by JS walls. We will not update the series." including offline capabilities