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

Reusability of HTTP Request Body in Go-chi Middleware

When working with Go-chi for HTTP routing, it's often necessary to reuse request bodies across multiple handlers. However, a common challenge arises when the request body can only be read once.

For instance, consider the following code:

func Registration(w http.ResponseWriter, r *http.Request) {
    b, err := ioutil.ReadAll(r.Body) // read request body
    // ...other code
    user.Create(w, r)
}

...

func Create(w http.ResponseWriter, r *http.Request) {
  b, err := ioutil.ReadAll(r.Body)  
  // ...other code
}

In this example, the Registration handler reads the request body using ioutil.ReadAll. When the Create handler is invoked, it attempts to re-read the body, resulting in an unexpected end of JSON input error.

The fundamental problem here is that the first call to ReadAll exhausts the request body. To resolve this issue, the request body must be restored with the data previously read. The following code demonstrates how:

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)
}

In this revised code, io.ReadAll is used to read the request body, and then the request body is restored with the bytes.NewReader and io.NopCloser functions before calling user.Create. This effectively makes the request body available for subsequent handlers.

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