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> You just can't perform network I/O synchronously.

Sure you can, you just shouldn't ever do it because it blocks the UI: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequ...

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Yeah I should've said there's no Node API for making synchronous HTTP requests (unless you count executing a child process synchronously). Even the older http.request API used in Node prior to the introduction of fetch is async and accepted a callback. Browsers have all sorts of deprecated foot guns though (like the synchronous mode of XMLHttpRequest).

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