visit_with_anchor.rb

CHROMEDRIVER_PATH = '/Users/dwt/.virtualenvs/yeepa/bin/chromedriver'
CHROME_PATH = '/Users/dwt/Applications/Network/Browser/Google Chrome.app/Contents/MacOS/Google Chrome'

def selenium()
  require 'capybara'
  require 'capybara/dsl'
  require 'selenium-webdriver'

  Capybara.register_driver :chrome do |app|
    Selenium::WebDriver::Chrome.driver_path = CHROMEDRIVER_PATH
    options = Selenium::WebDriver::Chrome::Options.new()
    options.binary = CHROME_PATH
  
    Capybara::Selenium::Driver.new(
      app,
      browser: :chrome,
      options: options
    )
  end
  Capybara.default_driver = :chrome

  Capybara.app_host = 'http://localhost:8080' unless Capybara.app_host
  puts 'before visit without anchor'
  Capybara.visit('http://localhost:8080')
  puts 'before visit with anchor'
  puts 'the print after this visit is not reached, instead it hangs and then shows an'
  puts 'ERROR Net::ReadTimeout: Net::ReadTimeout - just wait for it' 
  Capybara.visit('http://localhost:8080#foo')
  # [2018-02-28 08:26:23] ERROR Net::ReadTimeout: Net::ReadTimeout
  # [...]/net/protocol.rb:176:in `rbuf_fill'
  puts 'after visit with anchor'
end

def sinatra()
  require 'sinatra'

  set port: 8080

  get '/' do
    erb :index
  end
end

Thread.abort_on_exception = true
Thread.new do
  selenium()
end

sinatra()

__END__
@@ index
<a href="/#foo">link</a>
<a id="foo">target</a>