需求:在node端接口base64图片，然后要把base64上传到别的服务器，用了 request模块 上传需要把base64转成stream的形式上传，用了streamifier的模块转成stream提交但返回
"Processing of multipart/form-data request failed. Stream ended unexpectedly"

代码如下：

var file = 'base64文件'
var imgData = file.replace(/^data:image\/\w+;base64,/, ''); 
var dataBuffer = new Buffer(imgData, 'base64');
var imgBuffer = streamifier.createReadStream(dataBuffer) 
request.post({ url:httpurl,  formData:{'file':imgBuffer ,impl,type,dataType}},  function(error, response, body) {
                if (!error && response.statusCode == 200) {
                   console.log(body) // 请求成功的处理逻辑 
                   "Processing of multipart/form-data request failed. Stream ended unexpectedly" 
                   res.json({status:response.statusCode})
                }
            })