How to Receive multipart from the client?

Getting Help Code Review
4

thanks, you for help.
finally, I solved this problem:

for k,v := range req.MultipartForm.File{
		if k == "userName" {
			for _, v2 := range v {
				fmt.Println("main (130):::",v2)
	               b,_:=v2.Open()
					 sliceByte,_:=ioutil.ReadAll(b)
					   fmt.Println("main (245):::",string(sliceByte))
			}
		}
	}