Presumably you could use localhost and 3128. Does anything useful get written to the console window in settings?
If you're interested in how it works I believe it is simply: https://github.com/espruino/EspruinoTools/blob/gh-pages/core/utils.js#L363
Having said that, the easiest solution might just be to use Offline mode - also in settings. Just follow the instructions there - you can download a zip using your browser which will have a network connection, then upload it via the IDE.
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