关于 ruby?? on rails：Capybara-Webkit “无法加载 URL”

Capybara-Webkit "Unable to load URL"

我已经为这个问题苦苦挣扎了几天，无法弄清楚是什么导致了这个问题。测试套件在 TravisCI 上运行良好，并且在我重新启动计算机时在本地运行。不过，在本地做某事后，我不断收到相同的错误消息：

1	Unable to load URL: http://localhost.dev:3001/en/users/sign_in because of error loading http://localhost.dev:3001/en/users/sign_in: Unknown error (Capybara::Webkit::InvalidResponseError)

这是完整的 webkit 调试跟踪：

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Using the default profile...
..........Finished"EnableLogging" with response"Success()"
Wrote response true""
Received"Visit"
Started"Visit"
Load started
"Visit" started page load
Started request to"http://localhost.dev:3001/en/users/sign_in"
Finished"Visit" with response"Success()"
Received 0 from"http://localhost.dev:3001/en/users/sign_in"
Page finished with false
Load finished
Page load from command finished
Wrote response false"{"class":"InvalidResponseError","message":"Unable to load URL: http://localhost.dev:3001/en/users/sign_in because of error loading http://localhost.dev:3001/en/users/sign_in: Unknown error"}"
F-Received"Reset"
Started"Reset"
undefined|0|SECURITY_ERR: DOM Exception 18: An attempt was made to break through the security policy of the user agent.
Finished"Reset" with response"Success()"
Wrote response true""
Received"FindXpath"
Started"FindXpath"
Finished"FindXpath" with response"Success()"
Wrote response true""
..........F--------

(::) failed steps (::)

Unable to load URL: http://localhost.dev:3001/en/users/sign_in because of error loading http://localhost.dev:3001/en/users/sign_in: Unknown error (Capybara::Webkit::InvalidResponseError)

这出现在我尝试 visit 路径的应用程序中的任何位置。据我了解，"未知错误"来自 qt，而不是 capybara-webkit，但我不太确定谁最好问。我将 DNSmasq 用于子域，我们有多种语言，因此 localhost:3000 被重定向到 www.localhost.dev:3000/en。

事物的当前版本：

水豚 2.4.1
水豚-webkit 1.1.0
Cucumber 1.3.14
Cucumber rails 1.4.0
第 0.7.1 页
rails 4.0.0
ruby 2.1.2
dnsmasq 2.71
PostgreSQL 9.3.5
qt 4.8.6 OSX - 小牛队 10.9.4

编辑 1：也发布在 capybara-webkit 存储库上：https://github.com/thoughtbot/capybara-webkit/issues/667

编辑 2：这里是测试日志文件：https://gist.github.com/GolfyMcG/060053eba51a9ba69722