如何用nodejs通过post发送multipart/form-data类型的http请求

Question

如题所述

Answer 1

//发送单条消息给接口方app.post("/sendMsgToAByPost",function(req, res, next) {
//我的帖子：http://cnodejs.org/topic/4ffed8544764b729026b1da3
//http://yefeng.iteye.com/blog/315847
//http://stackoverflow.com/questions/5744990/how-to-upload-a-file-from-node-js
//http://stackoverflow.com/questions/9943010/node-js-post-file-to-server
 
 
console.log(req.files);
console.log(req.files.media.size);
var boundaryKey = Math.random().toString(16); //随机数，目的是防止上传文件中出现分隔符导致服务器无法正确识别文件起始位置
console.log(boundaryKey);
     
    var options = {
            host: 'api.com',
            port: 443,
            path: '/media?type=image&access_token='+accessToken,
            method: 'POST'
    };
     
    var reqHttps = https.request(options, function(resHttps) {
        console.log("statusCode: ", resHttps.statusCode);
        console.log("headers: ", resHttps.headers);
         
        resHttps.on('data', function(body1) {
        console.log("body:"+body1);
        });
    });
    var payload = '--' + boundaryKey + '\r\n'
    // use your file's mime type here, if known
    + 'Content-Type: image/jpeg\r\n' 
    // "name" is the name of the form field
    // "filename" is the name of the original file
    + 'Content-Disposition: form-data; name="media"; filename="aaa.jpg"\r\n'
    + 'Content-Transfer-Encoding: binary\r\n\r\n';
    console.log(payload.length);
    var enddata  = '\r\n--' + boundaryKey + '--';
    console.log('enddata:'+enddata.length);
    reqHttps.setHeader('Content-Type', 'multipart/form-data; boundary='+boundaryKey+'');
    reqHttps.setHeader('Content-Length', Buffer.byteLength(payload)+Buffer.byteLength(enddata)+req.files.media.size);
     
    reqHttps.write(payload);
     
    var fileStream = fs.createReadStream("D:\\aaa.jpg", { bufferSize: 4 * 1024 });
    fileStream.pipe(reqHttps, {end: false});
    fileStream.on('end', function() {
        // mark the end of the one and only part
        reqHttps.end(enddata); 
         
    });
     
    reqHttps.on('error', function(e) {
        console.error("error:"+e);
    });
 
});