Header `platform` is missing

Hello there.

I have an OPTIONS request that returns this header:

Access-Control-Allow-Headers: authorization, content-type, platform, sid, platform-version, x-device-id, accept-version

For the correct operation of the site, the next request should conatains the “platform” header.

But if I use cloudflare for my domain, no header is assigned. If I go to a site without cloudflare, the header is there and everything works.

What could be the problem?

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