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App Engine support for HTTP/3 on custom domains

Posted on 06-12-2023 01:47 PM
justinribeiro
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Reply posted on --/--/---- --:-- AM

Currently, *.appspot.com domains have H/3 support. An example from one of my domains:

ss-2023-06-12-justinribeiro-002.png

However, the same running setup when accessed from the custom domain only loads via H/2 as shown below:

ss-2023-06-12-justinribeiro-003.png

Previously this was mentioned on the old GAE forums as a potential isolated setup issue, but I see this across other GAE setups and I see no mention of this behavior in the documentation.

Curious is if there is an ETA on this feature reaching custom domains or if there is a larger issue at play.

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Posted on --/--/---- --:-- AM
Marvin_Lucero
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Reply posted on --/--/---- --:-- AM

Hi @justinribeiro ,

As of now, it is expected that HTTP/3 is not supported when using Custom Domains with App Engine. A feature request has been submitted regarding this. You can check it here. Currently there is no ETA for this feature or certainity of the feature implementation, however you can keep track of the possible future updates on the link provided.

As an alternative, you can use Load Balancer to support HTTP/3 in your applications. You can refer to this documentation for more information.

 

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