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I have only twice seen a service ever make a /v2.

It's typically to declare bankruptcy on the entirety of /v1 and force eventual migration of everyone onto /v2 (if that's even possible).



A lot of the Unix/Linux Syscall api has a version 2+

For example dup(), dup2(), dup3() and pipe(), pipe2() etc

LWN has an article: https://lwn.net/Articles/585415/

It talks about avoiding this by designing future APIs using a flags bitmask to allow API to be extended in future.


I work for a company that has an older api so it's defined in the header, but we're up to v6 at this point. Very useful for changes that have happened over the years.




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