Flask getting input with GET

I cant get Requests to work. I've tried several variations of this program and all of them show errors. This one shows
"Internal Server Error
The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application." Any help will be greatly appreciated.

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Answered by Saml2020 [earned 5 cycles]
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@Toadster change the index.html file to what I wrote