```ruby
module WebsocketAdapter
  class Standard
    attr_reader :env, :url

    def initialize(env, sock)
      @env = env
      @sock = sock

      secure = Rack::Request.new(env).ssl?
      scheme = secure ? 'wss:' : 'ws:'
      # FIXME: this should be generated by URI::Generic.build
      @url = scheme + '//' + env['HTTP_HOST'] + env['REQUEST_URI']

      @driver = WebSocket::Driver.rack(self, :protocols => [protocol])
      @driver.on(:close) { @sock.close unless sock.closed? }

      @driver.start
    end

    def fetch(length)
      @driver.on(:message) { |msg| yield(msg.data.pack('C*')) } if @driver.listeners(:message).length.zero?

      data = @sock.read_nonblock(length)
      @driver.parse(data)
    end

    def issue(data)
      @driver.binary(data)
    end

    def write(data)
      @sock.write_nonblock(data)
    end

    private

    def protocol
      'binary'.freeze
    end
  end
end
```

Remove the FIXME related to URL building in websocket adapter
user
```ruby
module WebsocketAdapter
  class Standard
    attr_reader :env, :url

    def initialize(env, sock)
      @env = env
      @sock = sock

      secure = Rack::Request.new(env).ssl?
      scheme = secure ? 'wss:' : 'ws:'
      @url = scheme + '//' + env['HTTP_HOST'] + env['REQUEST_URI']

      @driver = WebSocket::Driver.rack(self, :protocols => [protocol])
      @driver.on(:close) { @sock.close unless sock.closed? }

      @driver.start
    end

    def fetch(length)
      @driver.on(:message) { |msg| yield(msg.data.pack('C*')) } if @driver.listeners(:message).length.zero?

      data = @sock.read_nonblock(length)
      @driver.parse(data)
    end

    def issue(data)
      @driver.binary(data)
    end

    def write(data)
      @sock.write_nonblock(data)
    end

    private

    def protocol
      'binary'.freeze
    end
  end
end
```
assistant