Golang GET multipart form-data

Let say I have a html form

<form enctype="multipart/form-data" action="http://localhost:8080/incarcat" method="post">
	<input type="file" name="file" multiple="multiple"/>
	<input type="checkbox" name="delete" value="delete">
	<input type="submit" value="Load" />
</form>

and the following go code

read_form, err := req.MultipartReader()
for {
	part, err_part := read_form.NextPart()
	if err_part == io.EOF {
		break
	}
	if part.FormName() == "file" {
		//do something with files
	} else if part.FormName() == "delete" {
		//curata_folder()
		log.Println("delete is: ", part.Header.Get("delete"))
	}
}

How do i get the value of "delete"?

part.Header.Get("delete"))

it's not working

The part implements the io.Reader interface. I am assuming what you are really asking is how to convert the part reader into a string, in the case that it is not a file. You can do so like this:

for {
   part, err_part := read_form.NextPart()
   if err_part == io.EOF {
      break
   }
   if part.FormName() == "delete" {
      buf := new(bytes.Buffer)
      buf.ReadFrom(part)
      log.Println("delete is: ", buf.String())
   } 
}

You can probably content yourself by using the request.ParseMultipartForm method, then use the request.FormValue to get values as usual. Note that you also have the request.MultipartForm to get access to your files.

Example:

func(w http.ResponseWriter, r *http.Request) {
	// Here the parameter is the size of the form data that should
	// be loaded in memory, the remaining being put in temporary
	// files
	r.ParseMultipartForm(0)
	
	fmt.Println(r.FormValue("delete"))
}

The follow is an example of how to handle multipart/form-data and create a file from HTTP request using Golang.
Also, take a look in here for how to unit-test it

func UploadFile(w http.ResponseWriter, r *http.Request) {
 if err := r.ParseMultipartForm(4); err != nil {
  w.WriteHeader(http.StatusBadRequest)
  return
 }

 // create a temporary directory
 dir, err := os.MkdirTemp("", "tmp")
 if err != nil {
  w.WriteHeader(http.StatusInternalServerError)
  return
 }

 // create a temporary file
 f, err := os.CreateTemp(dir, "")
 if err != nil {
  _ = os.RemoveAll(dir)
  w.WriteHeader(http.StatusInternalServerError)
  return
 }
 defer closeFile(f)
 defer os.RemoveAll(dir)

 code := doSomething(f)
 if code != http.StatusOK {
  w.WriteHeader(code)
  return
 }

 w.WriteHeader(http.StatusCreated)
 w.Write([]byte("Done :)"))
}