最近使用到了 watir-webdriver, 在 mac 下使用火狐浏览器，去自动填充元素，在 ubuntu 下使用 headless，无界面去自动填充元素。

但是会碰到一个问题，连接超时

CarPublisher.browser.iframe(:id => "ContainerFrame").wait_until_present

#<URI::HTTP http://127.0.0.1:7055/hub/session/8f53eba2-13a2-f14e-97ec-36cfa00253ea/element>
"{\"using\":\"id\",\"value\":\"ContainerFrame\"}"
/Users/chuck/.rvm/gems/ruby-2.2.0/gems/watir-webdriver-0.9.1/lib/watir-webdriver/wait.rb:44:in `until': timed out after 90 seconds, waiting for {:id=>"ContainerFrame", :tag_name=>"iframe"} to become present (Watir::Wait::TimeoutError)

而在打开的火狐浏览器里，这个 iframe, 早就出现了，而在等待 90s 后，selenium-webdriver 说它超时。

通过 selenium-webdriver, 相当于起了一个 server, 而要操作浏览器的元素，都是通过一个个的 command, 然后发送 get, post 请求来获取或变更元素信息

command :describeElement,                        :get,     "session/:session_id/element/:id"
command :findChildElement,                       :post,    "session/:session_id/element/:id/element"
command :findChildElements,                      :post,    "session/:session_id/element/:id/elements"
command :clickElement,                           :post,    "session/:session_id/element/:id/click"
command :submitElement,                          :post,    "session/:session_id/element/:id/submit"
command :getElementValue,                        :get,     "session/:session_id/element/:id/value"
command :sendKeysToElement,                      :post,    "session/:session_id/element/:id/value"
command :uploadFile,                             :post,    "session/:session_id/file"
command :getElementTagName,                      :get,     "session/:session_id/element/:id/name"
command :clearElement,                           :post,    "session/:session_id/element/:id/clear"
command :isElementSelected,                      :get,     "session/:session_id/element/:id/selected"
command :isElementEnabled,                       :get,     "session/:session_id/element/:id/enabled"
command :getElementAttribute,                    :get,     "session/:session_id/element/:id/attribute/:name"
command :elementEquals,                          :get,     "session/:session_id/element/:id/equals/:other"
command :isElementDisplayed,                     :get,     "session/:session_id/element/:id/displayed"
command :getElementLocation,                     :get,     "session/:session_id/element/:id/location"
command :getElementLocationOnceScrolledIntoView, :get,     "session/:session_id/element/:id/location_in_view"
command :getElementSize,                         :get,     "session/:session_id/element/:id/size"
command :dragElement,                            :post,    "session/:session_id/element/:id/drag"
command :getElementValueOfCssProperty,           :get,     "session/:session_id/element/:id/css/:property_name"
command :getElementText,                         :get,     "session/:session_id/element/:id/text"

有大神碰到过这种情况吗，或者说 ruby 下，有没更好的无头浏览器方案？