启动了 Rails 服务器，但 localhost 页面无法加载

Question

我启动了rails服务器

$ bundle exec rails s -p 3001
=> Booting WEBrick
=> Rails 4.2.5 application starting in development on http://localhost:3001
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
[2016-11-03 19:29:30] INFO  WEBrick 1.3.1
[2016-11-03 19:29:30] INFO  ruby 2.2.5 (2016-04-26) [x86_64-darwin15]
[2016-11-03 19:29:30] INFO  WEBrick::HTTPServer#start: pid=30949 port=3001

但是当我转到http://localhost:3001 时出现错误：找不到此本地主机页面

这是我继续http://locahhost:3001 后在终端看到的数据 知道有什么问题吗？

{
  "timestamp": "2016-11-03T23:35:40Z",
  "severity": "DEBUG",
  "type": "none",
  "message": "  \u001b[1m\u001b[36mSQL (57.9ms)\u001b[0m  \u001b[1mUSE [peak]\u001b[0m"
}
{
  "timestamp": "2016-11-03T23:35:40Z",
  "severity": "INFO",
  "type": "database.query",
  "request_id": "67b064b7-f6a3-414e-9a39-da4f851fc8dd",
  "connection_id": "70230967245540",
  "event": "SQL",
  "query_id": "a15f740d4daad1a81dbc7e0df1ccf3e5",
  "query": "USE [peak]",
  "duration": "58.3"
}
{
  "timestamp": "2016-11-03T23:35:40Z",
  "severity": "INFO",
  "type": "none",
  "message": "Processing by HomeController#index as HTML"
}
{
  "timestamp": "2016-11-03T23:35:40Z",
  "severity": "INFO",
  "type": "none",
  "message": "  Rendered text template (0.0ms)"
}
{
  "timestamp": "2016-11-03T23:35:40Z",
  "severity": "INFO",
  "type": "view.render",
  "request_id": "67b064b7-f6a3-414e-9a39-da4f851fc8dd",
  "template": "text template",
  "layout": null,
  "duration": "0.4"
}
{
  "timestamp": "2016-11-03T23:35:40Z",
  "severity": "INFO",
  "type": "none",
  "message": "Completed 404 Not Found in 9ms (Views: 8.1ms | ActiveRecord: 0.0ms)"
}
{
  "timestamp": "2016-11-03T23:35:40Z",
  "severity": "INFO",
  "type": "application.request",
  "request_id": "67b064b7-f6a3-414e-9a39-da4f851fc8dd",
  "method": "GET",
  "status": 404,
  "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36",
  "referrer": null,
  "forwarded_for": null,
  "url_scheme": "http",
  "url_host": "localhost",
  "url_port": "3001",
  "url_path": "/",
  "url_query": null,
  "rails_controller": "home",
  "rails_action": "index",
  "clean_path": "/",
  "remote_ip": "::1",
  "remote_host": "::1",
  "duration": "1108.02",
  "message": "Not Found",
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
  "content_type": "text/plain; charset=utf-8"
}

Answer 1

Completed 404 Not Found in 9ms (Views: 8.1ms | ActiveRecord: 0.0ms)

您的服务器和您的应用程序运行良好；您的浏览器正在加载http://localhost:3001 的页面，非常好。

问题在于您的应用返回 404 Not Found - 换句话说，Rails 无法将控制器/操作与根路由匹配。

查看您的config/routes.rb 文件。您应该为root 定义一个路由，例如

root :to => 'home#index'

如果您直接访问路径（例如http://localhost:3001/example/path），请确保您已为此定义了路由：

get 'example/path', :to => 'controller#action'

最后，确保相关控制器存在并且为您的路由映射到的操作定义了方法（即对于root 示例，确保app/controllers/home_controller.rb 存在并且它定义了index 方法）。