How would you support multiple versions of an API and why?

- Multiple version instances behind a load balancer.
- Versioned controllers behind a proxy.

Curious to hear yours thoughts and reasoning.

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This stackoverflow answer
😂😂😂

our website got hacked somebody downloaded the whole source code and sent an email to us.
seems like that person would demand ransom or anything.
We still can't find where is the door ( vulnerability ) through which he pulled all files.

The reasons of existence behind every programming language.