[renefloor]

Summary

Join links on flutter.getstream.io (e.g. /video/beta/join/<id>) sometimes open to a blank page.

Routes like /join/<id> aren't files in the bucket, so the load balancer serves index.html for them. When the browser revalidates its cached copy (If-None-Match), the fallback fetches index.html with that header, gets a 304, and rewrites it to 200 with an empty body. The browser stores the empty page, and every later revalidation returns the same thing.

curl -H 'If-None-Match: "<index.html etag>"' https://flutter.getstream.io/video/beta/join/<id>
→ 200, content-length: 0
curl -H 'If-None-Match: "<index.html etag>"' https://flutter.getstream.io/video/beta/
→ 304

A trailing / only seemed to help because the browser caches it as a different URL. The first visit works and a reload within 60 s goes blank.

Change

• rsync leaves index.html out.
• index.html is then uploaded on its own with Cache-Control: no-store, so browsers never store it and never send a conditional request for an app route. It is also uploaded last, after the assets it references.

Testing

• After the next v2 deploy: curl -sI https://flutter.getstream.io/video/beta/index.html shows cache-control: no-store
• Opening a join link, then reloading it, loads the app both times

The deployer service account needs to be able to overwrite index.html. rsync already overwrites objects, so it should.

🤖 Generated with Claude Code

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[codecov]

Codecov Report

✔️ No coverage data to report, because files changed do not require tests or are set to ignore