Created by: duxiaofeng-github
This PR introduce two new middlewares: fail and complete.
Why we need these two new middlewares?
Because the old post middleware can be only executed when the request is successful. it will not be executed when something going wrong during the whole request process.
Therefore, I add these two middlewares in try/catch block to approach this.
By the way, the old pre and post middlewares will not be effected, they should act like before. So this PR has no breaking changes.
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