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我注意到在 中Rails 3.2.2，所有动作都以*/*格式处理。所以问题是：什么意思*/*？以及为什么默认调用它（每次）？

因为一个动作有两个处理：

Started GET "/" for 127.0.0.1 at 2012-07-07 22:50:22 +0200
Processing by MainController#index as HTML

Started GET "/" for 127.0.0.1 at 2012-07-07 22:50:22 +0200
Processing by MainController#index as */*

我试图设置：

  respond_to :html

  def index
    @posts = Post.all
    respond_with(@posts)
  end

但同样的问题仍然存在。

刚刚创建了基于Rails 3.2.6. 用Thin 1.4.1和测试Webrick。同样的问题：

=> Booting Thin
=> Rails 3.2.6 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
>> Thin web server (v1.4.1 codename Chromeo)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:3000, CTRL+C to stop

Started GET "/mains" for 127.0.0.1 at 2012-07-09 10:53:55 +0200
Connecting to database specified by database.yml
Processing by MainsController#index as HTML
  Main Load (0.1ms)  SELECT `mains`.* FROM `mains` 
  Rendered mains/index.html.erb within layouts/application (2.7ms)
Completed 200 OK in 97ms (Views: 51.6ms | ActiveRecord: 1.3ms)


Started GET "/mains" for 127.0.0.1 at 2012-07-09 10:53:55 +0200
Processing by MainsController#index as */*
  Main Load (0.1ms)  SELECT `mains`.* FROM `mains` 
  Rendered mains/index.html.erb within layouts/application (0.5ms)
Completed 200 OK in 10ms (Views: 8.6ms | ActiveRecord: 0.1ms)
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