class Webpacker::DevServerProxy

def initialize(app = nil, opts = {})
  @webpacker = opts.delete(:webpacker) || Webpacker.instance
  opts[:streaming] = false if Rails.env.test? && !opts.key?(:streaming)
  super
end

def perform_request(env)
  if env["PATH_INFO"].start_with?("/#{public_output_uri_path}") && dev_server.running?
    env["HTTP_HOST"] = env["HTTP_X_FORWARDED_HOST"] = dev_server.host
    env["HTTP_X_FORWARDED_SERVER"] = dev_server.host_with_port
    env["HTTP_PORT"] = env["HTTP_X_FORWARDED_PORT"] = dev_server.port.to_s
    env["HTTP_X_FORWARDED_PROTO"] = env["HTTP_X_FORWARDED_SCHEME"] = dev_server.protocol
    unless dev_server.https?
      env["HTTPS"] = env["HTTP_X_FORWARDED_SSL"] = "off"
    end
    env["SCRIPT_NAME"] = ""
    super(env)
  else
    @app.call(env)
  end
end

def public_output_uri_path
  config.public_output_path.relative_path_from(config.public_path).to_s + "/"
end