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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-Hostheader, which applies if this server runs behind a proxy.
Hostheader, which applies for HTTP 1.1 if we are contacted directly.
|Request||is the current request. If it is left unbound, and the request is needed, it is obtained with http_current_request/1.|