class Falcon::Middleware::Proxy

def prepare_request(request, host)
	forwarded = []
	
	Async.logger.debug(self) do |buffer|
		buffer.puts "Request authority: #{request.authority}"
		buffer.puts "Host authority: #{host.authority}"
		buffer.puts "Request: #{request.method} #{request.path} #{request.version}"
		buffer.puts "Request headers: #{request.headers.inspect}"
	end
	
	# The authority of the request must match the authority of the endpoint we are proxying to, otherwise SNI and other things won't work correctly.
	request.authority = host.authority
	
	if address = request.remote_address
		request.headers.add(X_FORWARDED_FOR, address.ip_address)
		forwarded << "for=#{address.ip_address}"
	end
	
	if scheme = request.scheme
		request.headers.add(X_FORWARDED_PROTO, scheme)
		forwarded << "proto=#{scheme}"
	end
	
	unless forwarded.empty?
		request.headers.add(FORWARDED, forwarded.join(';'))
	end
	
	request.headers.add(VIA, "#{request.version} #{self.class}")
	
	self.prepare_headers(request.headers)
	
	return request
end