Nginx: allow access to admin ONLY if the request has a secret header. Do this without the if-evil case.

[Quintin Par]

My website’s being hit hard and I am trying to see if I can limit this at
the load balancer (Nginx) level by cutting off requests that don’t have a
special header.

I’ve seen some solutions that involve the if statement, notably

https://stackoverflow.com/questions/18970620/nginx-reject-request-if-header-is-not-present-or-wrong


Can someone help me with a solution that does NOT involve using an if
statement?

- Quintin
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