Is it possible to analyze result and query a second server?

[Jason Bronnx]

Hi,

Tried to search on this for a couple of hours, but had no luck, hoping you
guys can help.

I have a use case, that I need to proxy the request to server-A first, then
if returns 200, then it'll query server-B and return that result.  If it
returned != 200, just return 404.  Something like this:

function pseudoCode() {
  if (server-a.process() == 200) {
    return server-b.process()
  }

  // Got a non-200 from server-a, just return 404
  return 404
}

Is there a straightforward way of doing this in nginx?

Thanks!
Jason

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