javascript – Ajax上传文件到内容类型为Multipart的GoLang服务器

我正在尝试使用多部分表单将音频文件上传到Golang服务器.但是,Go返回错误：

multipart: NextPart: bufio: buffer full

我相信这表明我的Javascript请求在多部分格式中没有.这是我的Javascript：

function UploadFile(file) {
    var xhr = new XMLHttpRequest();


    if (file.type == "audio/mpeg" && file.size <= $id("MAX_FILE_SIZE").value) {
        // start upload
        var boundary = '---------------------------' + Math.floor(Math.random()*32768) + Math.floor(Math.random()*32768) + Math.floor(Math.random()*32768);

        xhr.open("POST", $id("upload").action, true);
        xhr.setRequestHeader("Content-Type", "multipart/form-data; boundary=" + boundary);
        xhr.setRequestHeader("X_FILENAME", file.name);
        xhr.send(file);
    }
}

这是我的Golang服务器处理程序：

func FileHandler(w http.ResponseWriter, r *http.Request) {
    var (
        status int
        err    error
    )
    defer func() {
        if nil != err {
            http.Error(w, err.Error(), status)
        }
    }()
    // parse request with maximum memory of _24Kilobits
    const _24K = (1 << 20) * 24
    if err = r.ParseMultipartForm(_24K); nil != err {
        fmt.Println(err)
        status = http.StatusInternalServerError
        return
    }
    for _, fheaders := range r.MultipartForm.File {
        for _, hdr := range fheaders {
            // open uploaded
            var infile multipart.File
            if infile, err = hdr.open(); nil != err {
                status = http.StatusInternalServerError
                return
            }
            // open destination
            var outfile *os.File
            if outfile, err = os.Create("./uploaded/" + hdr.Filename); nil != err {
                status = http.StatusInternalServerError
                return
            }
            // 32K buffer copy
            var written int64
            if written, err = io.copy(outfile, infile); nil != err {
                status = http.StatusInternalServerError
                return
            }
        w.Write([]byte("uploaded file:" + hdr.Filename + ";length:" + strconv.Itoa(int(written))))
        }
    }
}

如果有人有任何想法我为什么会收到这个错误,我会非常感激.

解决方法:

经过与Ajax请求的漫长而艰苦的斗争,我得到了它发送正确的信息.这是我使用的代码：

var xhr = new XMLHttpRequest(),
    boundary=Math.random().toString().substr(2);

var formdata = new FormData();
formdata.append("file", file);

xhr.open("POST", $id("upload").action, true);
//xhr.setRequestHeader("content-type", "multipart/form-data; charset=utf-8; boundary=" + boundary);
xhr.send(formdata);

请注意标题已不再使用,我发现您可以将数据附加到formdata比任何其他方法更容易,例如：How to send multipart/form-data form content by ajax (no jquery)?