module ActionDispatch::Http::URL

req.raw_host_with_port # => "example.com:8080"
req = Request.new 'HTTP_HOST' => 'example.com:8080'

req.raw_host_with_port # => "example.com"
req = Request.new 'HTTP_HOST' => 'example.com'

end
include ActionDispatch::Http::URL
class Request < Rack::Request

Returns the \host for this request, such as "example.com".

def raw_host_with_port
  if forwarded = x_forwarded_host.presence
    forwarded.split(/,\s?/).last
  else
    get_header('HTTP_HOST') || "#{server_name || server_addr}:#{get_header('SERVER_PORT')}"
  end
end