write ECONNABORTED
```
  Error: write ECONNABORTED
      at afterWriteDispatched (internal/stream_base_commons.js:75:25)
      at writeGeneric (internal/stream_base_commons.js:70:3)
      at Socket._writeGeneric (net.js:760:5)
      at Socket._write (net.js:772:8)
      at doWrite (_stream_writable.js:410:12)
      at clearBuffer (_stream_writable.js:540:7)
      at Socket.Writable.uncork (_stream_writable.js:314:7)
      at ServerResponse.end (_http_outgoing.js:733:21)
      at respond (E:\WebstormProjects\test\node_modules\koa\lib\application.js:243:7)
      at handleResponse (E:\WebstormProjects\test\node_modules\koa\lib\application.js:149:34)
      at process._tickCallback (internal/process/next_tick.js:68:7)
```

my code:
```
const Koa =require("koa")
const app =new Koa();
app.use(ctx=>ctx.body={name:"hello world"});
app.listen(4000)
```

if i run ```  autocannon -c 100 -d 5 -p 10 http://127.0.0.1:4000/ ```  will error