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TJ Holowaychuk 2013-09-02 19:13:47 -07:00
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@ -39,6 +39,20 @@ app.use(function(next){
![koa middleware](https://i.cloudup.com/N7L5UakJo0.gif) ![koa middleware](https://i.cloudup.com/N7L5UakJo0.gif)
1. Create a date to track duration
2. Yield control to the next middleware
3. Create another date to track response time
4. Yield control to the next middleware
5. Yield immediately since `contentLength` only works with responses
6. Yield upstream to Koa's noop middleware
7. Ignore setting the body unless the path is "/"
8. Set the response to "Hello World"
9. Ignore setting Content-Length when no body is present
10. Set the field
11. Output log line
12. Set `X-Response-Time` header field before response
13. Hand off to Koa to handle the response
Next we'll look at the best practices for creating Koa middleware. Next we'll look at the best practices for creating Koa middleware.
## Middleware Best Practices ## Middleware Best Practices