This post is from the WWDC26 Networking Q&A.
Is the system default for this still false as of the OS 27 releases?
When would you recommend setting it to true?
URLRequest.assumesHTTP3Capable
Recommended
Yes, the default of assumesHTTP3Capable remains false on 27.0, and URLSession will try to discover HTTP/3 using DNS and Alt-Svc. Please set it to true if you know that your server supports HTTP/3.