How to use find_available_port method of Capybara Package

Best Capybara code snippet using Capybara.find_available_port


Source:server.rb Github


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...29 @host = deprecated_options[1] || host30 @reportable_errors = deprecated_options[2] || reportable_errors31 @port = deprecated_options[0] || port32 @port ||= Capybara::Server.ports[port_key]33 @port ||= find_available_port(host)34 @checker =, @port)35 end36 def reset_error!37 middleware.clear_error38 end39 def error40 middleware.error41 end42 def using_ssl?43 @checker.ssl?44 end45 def responsive?46 return false if @server_thread&.join(0)47 res = @checker.request { |http| http.get('/__identify__') }48 return res.body == app.object_id.to_s if res.is_a?(Net::HTTPSuccess) || res.is_a?(Net::HTTPRedirection)49 rescue SystemCallError, Net::ReadTimeout, OpenSSL::SSL::SSLError50 false51 end52 def wait_for_pending_requests53 timer = Capybara::Helpers.timer(expire_in: 60)54 while pending_requests?55 raise "Requests did not finish in 60 seconds: #{middleware.pending_requests}" if timer.expired?56 sleep 0.0157 end58 end59 def boot60 unless responsive?61 Capybara::Server.ports[port_key] = port62 @server_thread = do63, port, host)64 end65 timer = Capybara::Helpers.timer(expire_in: 60)66 until responsive?67 raise 'Rack application timed out during boot' if timer.expired?68 @server_thread.join(0.1)69 end70 end71 self72 end73 def base_url74 "http#{'s' if using_ssl?}://#{host}:#{port}"75 end76 private77 def middleware78 @middleware ||=, @reportable_errors, @extra_middleware)79 end80 def port_key81 Capybara.reuse_server ? app.object_id : middleware.object_id82 end83 def pending_requests?84 middleware.pending_requests?85 end86 def find_available_port(host)87 server =, 0)88 port = server.addr[1]89 server.close90 # Workaround issue where some platforms (mac, ???) when passed a host91 # of '' will return a port that is only available on one of the92 # ip addresses that resolves to, but the next binding to that port requires93 # that port to be available on all ips94 server =, port)95 port96 rescue Errno::EADDRINUSE97 retry98 ensure99 server&.close100 end...

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