Cloudflare Turnstile was failing in my WebView — finally fixed it

I ran into an issue where the WebView in my iOS app couldn’t pass the Cloudflare Turnstile challenge, even though the same page worked fine in a regular browser.

After digging into it for a while, I figured out what was going wrong and managed to fix it. I wrote up the full investigation and solution in a blog post here, and I’ve also shared the test codebase in the post: https://letitcode.dev/t/why-can-t-my-webview-pass-the-cloudflare-turnstile-challenge/73