Thanks for testing! That's a pity it didn't work like I thought but glad you got it working. The problem is due to the (very hacky) way I'm working around the limitations of the BusyBox HTTP server. It redirects /left to /left/ which works fine in a browser or modern app, but I guess the code for the ESP doesn't handle redirects. I agree it should be fixed, but unfortunately I don't think it's possible with how things work currently. I'm hoping to spend some time soon learning Rust so I can re-write the backend in a less hacky way. If I can do that then it'll be easy to make /left and /right work without redirects.
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