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false), try to replace a local hostname
by a world-wide accessible name.
This predicate performs the following steps to find the host and port:
X-Forwarded-Host header, which applies if this server
runs behind a proxy.
Host header, which applies for HTTP 1.1 if we are
|- is the current request. If it is left unbound, and the request is needed, it is obtained with http_current_request/1.