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@ -39,6 +39,20 @@ app.use(function(next){
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![koa middleware](https://i.cloudup.com/N7L5UakJo0.gif)
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![koa middleware](https://i.cloudup.com/N7L5UakJo0.gif)
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1. Create a date to track duration
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2. Yield control to the next middleware
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3. Create another date to track response time
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4. Yield control to the next middleware
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5. Yield immediately since `contentLength` only works with responses
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6. Yield upstream to Koa's noop middleware
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7. Ignore setting the body unless the path is "/"
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8. Set the response to "Hello World"
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9. Ignore setting Content-Length when no body is present
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10. Set the field
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11. Output log line
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12. Set `X-Response-Time` header field before response
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13. Hand off to Koa to handle the response
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Next we'll look at the best practices for creating Koa middleware.
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Next we'll look at the best practices for creating Koa middleware.
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## Middleware Best Practices
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## Middleware Best Practices
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