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I tried using no UA header at all for a period of a few weeks, many years ago when "appsites" weren't as common, and yet a lot of sites failed to load mysteriously, showed odd server errors, or even banned my IP for being a bot.

I expect no UA header to be even less usable now that sites are more paranoid and app-ified, so instead I use a random one. That still confuses some sites...






A random one makes you unique and thus identifiable across sites.

I meant random as in "randomly picked from list of common UAs", not as in "randomly generated GUID".

Random UA can get you outright blocked for looking like a bot. So is faking Googlebot and such.



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