Cowboy 服务器在启动时退出且没有错误

Question

我是运行一个简单的牛仔服务员。这是我的申请文件：

defmodule MyApp.Application do                                                      
  @moduledoc "Application file"                                                    
                                                                                   
  use Application                                                                  
                                                                                   
  def start(_type, _args) do                                                       
    children = [                                                                   
      Plug.Cowboy.child_spec(                                                      
        scheme: :http,                                                             
        plug: MyApp.Web.Endpoint,                                                   
        options: [port: 8000]                                                                                                                                          
      )                                                                            
    ]                                                                              
                                                                                   
    opts = [strategy: :one_for_one, name: MyApp.Supervisor]                         
    IO.puts("Starting...")                                                         
    Supervisor.start_link(children, opts) |> IO.inspect                            
  end                                                                              
end                                                                                

这是我的终点：

defmodule MyApp.Web.Endpoint do                                                     
  @moduledoc """                                                                   
  This is the module responsible for processing incoming requests                  
  """                                                                              
                                                                                   
  use Plug.Router                                                                  
  import Plug.Conn, only: [send_resp: 3]                                           
                                                                                   
  plug(Plug.Logger)                                                                
  plug(:match)                                                                     
  plug(:dispatch)                                                                  
                                                                                   
  get "/ping" do                                                                   
    send_resp(conn, 200, "pong")                                                                                                                                       
  end                                                                              
                                                                                   
end                                                                                

在 运行 mix run 之后，我看到了启动日志（“正在启动...”），但我的应用程序立即退出而不是侦听连接。我如何让它无限期地收听？

Answer 1

来自mix run docs：

mix run can be used to start the current application dependencies, the application itself, and optionally run some code in its context. For long running systems, this is typically done with the --no-halt option:

mix run --no-halt