How to reuse stream in golang

peek.go

package utils

import (
	"bytes"
	"io"
	"io/ioutil"
	"net/http"
)

// PeekReadCloser return a copy of a reader without loosing the original content
func PeekReadCloser(stream io.ReadCloser, cpy *[]byte) {
	*cpy, _ = ioutil.ReadAll(stream)
	stream = ioutil.NopCloser(bytes.NewReader(*cpy))
}

// PeekHTTPRequestBody return a copy of a reader without loosing the original content
func PeekHTTPRequestBody(r *http.Request, cpy *[]byte) {
	PeekReadCloser(r.Body, cpy)
}