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A lot of just don't realize how and where it's used. I'm almost 100% positive that Microsoft uses HAProxy (open source or commercial license I couldn't tell you) to power App Services on Azure. Yet you'll get friction from CTOs at "Microsoft shops" for choosing HAProxy to use yourself.

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> I'm almost 100% positive that Microsoft uses HAProxy (open source or commercial license I couldn't tell you) to power App Services on Azure.

I think you'll find they're using ARR and not HAProxy for the "batteries included" load balancer. You can tell this from the cookie names "ARRAffinity" and "ARRAffinitySameSite".

Almost certain that AWS uses HAProxy behind their ELB (Elastic Load Balancer) service. But if you know HAProxy, you feel very limited when using ELB.

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