How Can I Reuse Request Bodies in Go-chi HTTP Middleware Handlers?

Determining Request Body Reusability in HTTP Middleware Handlers

In this scenario, the issue arises when trying to reuse a method within another in a Go-chi HTTP router. The outer handler, Registration(), reads the request body using ioutil.ReadAll(r.Body), leaving no data available for the inner handler, Create(), to parse JSON from.

Solution: Restoring the Request Body

To resolve this issue, implement the following fix:

func Registration(w http.ResponseWriter, r *http.Request) {
    b, err := io.ReadAll(r.Body) 
    // ...other code
    r.Body = io.NopCloser(bytes.NewReader(b))
    user.Create(w, r)
}

Here's how this code addresses the problem:

• io.ReadAll(r.Body): Reads the entire request body.
• io.NopCloser(bytes.NewReader(b)): Restores the request body by creating an io.Reader from the previously read data.
• r.Body = io.NopCloser(...): Replaces the original r.Body with the restored body.

In this way, the inner handler can access the JSON data from the request body without encountering the "unexpected end of JSON input" error.

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