Error: Custom { kind: InvalidData, error: "stream did not contain valid UTF-8" }

[Evilhotdog]

When attempting to authenticate with redirect URI https://127.0.0.1/redirect, after having granted permission on the Microsoft end, the program suddenly crashes with the text "Error: Custom { kind: InvalidData, error: "stream did not contain valid UTF-8" }"
I'm running the auth_code_flow example, but with the redirect URI edited to https to make Azure happy

[KernelFreeze]

You can try adding some debug code to check what your browser is sending to the redirect URL, but the example uses a dummy HTTP server that can get broken easily. It's based on this example from oauth2-rs so you can also try that to make sure that the problem is with this library.