Enabling HTTP/3 on Safari 17

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Mr. Root Author

Level 1

5 points

Enabling HTTP/3 on Safari 17

My Safari 17.6 is not showing my HTTP/3 capability when visiting test sites.

With Web Inspector open I visit the following test pages:

https://cloudflare-quic.com/

https://litespeedtech.com/

And after clicking "refresh" several times, all I see for protocol is "h2", which is bad.

When visiting the same pages from Chrome or Firefox from the same machine both result in "h3" or "HTTP/3".

I am testing HTTP/3 functionality on my website with major browsers, and so far the Safari functionality is below expectations. Based on my research it appears that Apple has removed "HTTP/3" option from Experimental Features because it is now supposed to be enabled as the standard has been ratified (RFC 9114), however it clearly isn't working on the designated test pages.

How do I enable HTTP/3 on my Safari 17?

Posted on Aug 30, 2024 2:21 PM

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Answer 1

lkrupp

Level 7

23,545 points

Aug 31, 2024 5:24 AM in response to Mr. Root

If you poke around on a search engine there is nothing mentioning Safari 17 and HTTP/3. None of the local experts (none of us are Apple employees or Apple Support) have responded yet. Not a good sign of a positive answer. The references I found only mention HTTP/3 experimental support for Safari.

There is a developer version of Safari that is available to the public called Safari Technology Preview (currently version 18). You might try downloading it and see if it helps.

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Answer 2

lkrupp

Level 7

23,545 points

Aug 31, 2024 5:26 AM in response to lkrupp

If you poke around on a search engine there is nothing mentioning Safari 17 and HTTP/3. None of the local experts (none of us are Apple employees or Apple Support) have responded yet. Not a good sign of a positive answer. The references I found only mention HTTP/3 experimental support for Safari.

There is a developer version of Safari that is available to the public called Safari Technology Preview (currently version 18). You might try downloading it and see if it helps.

Safari Technology Preview - Safari - Apple Developer

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Answer 3

Mr. Root Author

Level 1

5 points

Aug 30, 2024 6:03 PM in response to lkrupp

That link is iOS App development in Xcode, not about Safari at all.

I suppose I should have also clarified that my question is regarding Safari on desktop Mac, but likely that can be inferred since I mentioned Web Inspector which AFAIK isn't available on mobile...

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Answer 4

lkrupp

Level 7

23,545 points

Aug 30, 2024 4:15 PM in response to Mr. Root

TN3102: HTTP/3 in your app | Apple Developer Documentation

This is for Safari 15 and I don’t if Safari 17 supports it at all.

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Enabling HTTP/3 on Safari 17

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