No-vary-search and prerender on Android updates#29114
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Elchi3
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Feb 27, 2026
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Thanks @tunetheweb, I have no testing device and I think this should land for now. We can always improve if we have better information.
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Co-authored-by: Florian Scholz <fs@florianscholz.com>
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Summary
This an update to #28689 due to the following changes for No-Vary-Search support on HTTP Cache:
While reviewing the changes for webview I also noticed that the data was incorrect about prerender overall (No-Vary-Search was originally a for that, but since expanded to HTTP Cache) so corrected that too.
Test results and supporting details
It's difficult to test these changes. I tried browser stack but it's on 142 and can't see how to update. My own personal testing device has 145 and also auto upgrades.
If you have access to a 143 device then you can follow test instructions here: #28689
Saying that, here's the change request enabling it from 143 and specifically mentioning webview is not included: https://critique.corp.google.com/cl/872578913
As to the Prerender partial support on webview, that's based on https://goo.gle/android-prerender which was released in Android 1.13.0 as per doc docs, which roughly coincides with Chrome 135.
Related issues
An update to #28689