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I've been building reactjs apps on a windows machine for the past year, running the Visual Studio IIS test server for debugging / testing.

I just installed a windows update pack, rebooted, and my local VS IIS Express server fails to serve my sites anymore-- the only errors reported are:

localhost/:19 GET https://localhost:44332/static/js/main.chunk.js net::ERR_HTTP2_PROTOCOL_ERROR 200
localhost/:19 GET https://localhost:44332/static/js/vendors~main.chunk.js net::ERR_HTTP2_PROTOCOL_ERROR 200

I have no idea where to start debugging this-- this ERR_HTTP2_PROTOCOL_ERROR seems to have a bunch of possible causes. Rebooting, clearing my browser caches, using incognito mode, using other browsers all seem to have the same problem.

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After lots of searching I came across this SO thread, which was the solution for me: https://stackoverflow.com/questions/67747270/reactjs-neterr-http2-protocol-error-200-with-netcore-in-https/67767129#67767129

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