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Microsoft Edge WebView2: CORS for hosted web content, host object callbacks, and enterprise policy overrides
WebView2 embeds Chromium with custom schemes—treat `https://appassets` and `localhost` origins as first-class in CORS docs.
1 min read
webview2edgecors
Fixed Version runtime
Pinned runtimes lag behind Chrome—retest CORS after updating the WebView2 runtime bundle.
Offline installers may skip patch updates—document minimum runtime versions for security.
Debugging
Enable remote debugging to inspect CORS headers inside WebView2 sessions—match DevTools settings to desktop Edge.
Crash dumps may omit headers—use ETW logging for network failures in Windows.