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well here's something I didn't know, might be interesting to PWA developers.

the WHATWG started allowing user-agent to be settable by fetch requests back in 2015! see issue [1] and change [2]

Firefox and Safari (including iOS Safari which is every browser app) now allow setting a custom user agent on fetch requests, overriding the browser user agent! (just verified)

Chrome based browsers still do not, so we're in a split world atm

[1] https://github.com/whatwg/fetch/issues/37

[2] https://github.com/whatwg/fetch/commit/dab09b0c483c46324082df1e54b29ed4c9c02162