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                            ```
const Koa = require('koa')

const app = new Koa()

app.use(ctx => {
    ctx.body = 'hello koa'
})

app.listen(3030, () => {
    console.log('http://localhost:3030/');
})
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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