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Is it possible to detect if an incoming request is being made through a proxy server? If a web application ‘bans’ users via IP address, they could bypass this by using a proxy server. That is just one reason to block these requests. How can this be achieved?
IMHO there’s no 100% reliable way to achieve this but the presence of any of the following headers is a strong indication that the request was routed from a proxy server:
You could also look for the proxy or pxy in the client domain name.