How to read request body twice in Golang middleware?

Question

In a middleware, I want to read request body to perform some checks. Then, the request is passed to the next middleware where the body will be read again. Here\'s what I do:

Answer 1

Will it break since the previous req.Body.Close implementation did some connection handling?

No.

But your code is buggy: You should close the req.Body once you are done reading all of it. Then you construct a new ReadCloser as you did and hand this to the next middleware (which itself or stuff further down is responsible for closing is.)

bodyBytes, _ := ioutil.ReadAll(req.Body)
req.Body.Close()  //  must close
req.Body = ioutil.NopCloser(bytes.NewBuffer(bodyBytes))