trafficonese

# If we receive X-Forwarded-Proto, pass it through; otherwise, pass along the
# scheme used to connect to this server
map $http_x_forwarded_proto $proxy_x_forwarded_proto {
  default $http_x_forwarded_proto;
  ''      $scheme;
}
# If we receive X-Forwarded-Port, pass it through; otherwise, pass along the
# server port the client connected to
map $http_x_forwarded_port $proxy_x_forwarded_port {
  default $http_x_forwarded_port;

trafficonese

// Browser fingerprinting is a technique to "mark" anonymous users using JS
// (or other things).  To build an "identity" of sorts the browser is queried
// for a list of its plugins, the screen size and several other things, then
// hashes them.  The idea is that these bits of information produce an unique
// "fingerprint" of sorts; the more elaborate the list of data points is, the
// more unique this fingerprint becomes.  And you wouldn't even need to set a
// cookie to recognize this user when she visits again.
//
// For more information on this topic consult
// [Ars Technica](http://arstechnica.com/tech-policy/news/2010/05/how-your-web-browser-rats-you-out-online.ars)