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Express behind proxies
Using Express behind a reverse proxy (such as Varnish or Nginx)
is trivial; however, it does require configuration. By enabling the
“trust proxy” setting via app.enable('trust proxy'), Express
will have knowledge that it’s sitting behind a proxy and that the
X-Forwarded-* header fields may be trusted. (Otherwise,
they are easily spoofed.)
Enabling this setting has several subtle effects. The first is
that X-Forwarded-Proto may be set by the reverse proxy to
tell the app whether it is https or simply http. This value is reflected
by req.protocol.
The second change is that the req.ip
and req.ips values will be populated with
X-Forwarded-For’s list of addresses.
