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You are not stating which protocol you are using, so I am assuming we are talking https. Each backend probably know some information about itself, which would uniquely identify that backend. That could be a hostname or a unicast IP address. The backend can include that information in appropriate locations. You could include it in a footer on each page. Or ...


If you want to be discreet, just have the webserver identify itself in a Server: response header (RFC 2616 Sec 14.38). For example, in Apache, the information returned in that header is controlled by the ServerTokens directive. Then, it's just a matter of inspecting the response headers in Firebug, Chrome DevTools, or Safari Web Inspector timeline. If you ...

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