我編寫了一個 HTTP 請求來發(fā)送文件內(nèi)容：// HTTP request.req, err := UploadRequest("/slice", "file", pth)通過這個函數(shù)：// Creates a new file upload http request.// https://gist.github.com/mattetti/5914158/f4d1393d83ebedc682a3c8e7bdc6b49670083b84func UploadRequest(uri string, paramName, path string) (*http.Request, error) {    file, err := os.Open(path) // handle err...    fileContents, err := ioutil.ReadAll(file) // handle err...    fi, err := file.Stat() // handle err...    file.Close()    body := new(bytes.Buffer)    writer := multipart.NewWriter(body)    part, err := writer.CreateFormFile(paramName, fi.Name()) // handle err...    part.Write(fileContents)    err = writer.Close() // handle err...    request, err := http.NewRequest("POST", uri, body)    request.Header.Add("Content-Type", writer.FormDataContentType())    return request, err}問題請求處理程序接收請求正文：func Handler(w http.ResponseWriter, r *http.Request) {    switch r.Method {    case "POST":        body, err := ioutil.ReadAll(r.Body) // I have request body :)    }}調(diào)試器顯示請求body是：我試圖在\r\n\r\n字符之后獲取身體數(shù)據(jù)。我怎樣才能做到這一點？試過了這是嘗試過的，但沒有奏效：err = r.ParseForm() // Handle err...stl := r.PostForm.Get("file") // "file" param name is hard-coded.// `stl` is just an empty string.http去郵政