[solved] Pico as http server: "Uncaught Error: > not registered"

Why bother with 0.05" pitch when you don't have to?

It's just because that's what the shim uses to avoid using up pins that are a bit easier to use for other things. There's absolutely no problem using other pins, but B6/B7 are used by default for the console when USB is disconnected, so when you're not connected to a PC with USB you'll need to make sure you move the console back away from B6/B7 non startup with USB.setConsole().

Pages above 1k should work fine - I'm a bit busy but I'll take a look at the not registered issue and see if I can figure out what's up. Otherwise upgrading the firmware on the ESP8266 seems to work really well now.