Go(PDF 및 JSON)에서 여러 요청 부분을 처리하는 방법은 무엇입니까?

<code class="go">func (s *Server) PostFileHandler(w http.ResponseWriter, r *http.Request) {
    mr, err := r.MultipartReader()
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    doc := Doc{}
    for {
        part, err := mr.NextPart()

        // This is OK, no more parts
        if err == io.EOF {
            break
        }

        // Some error
        if err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
            return
        }

        // PDF 'file' part
        if part.FormName() == "file" {
            doc.Url = part.FileName()
            fmt.Println("URL:", part.FileName())
            outfile, err := os.Create("./docs/" + part.FileName())
            if err != nil {
                http.Error(w, err.Error(), http.StatusInternalServerError)
                return
            }
            defer outfile.Close()

            _, err = io.Copy(outfile, part)
            if err != nil {
                http.Error(w, err.Error(), http.StatusInternalServerError)
                return
            }
        }

        // JSON 'doc' part
        if part.FormName() == "doc" {
            jsonDecoder := json.NewDecoder(part)
            err = jsonDecoder.Decode(&doc)
            if err != nil {
                http.Error(w, err.Error(), http.StatusInternalServerError)
                return
            }</code>