Node.js HTTP请求没有返回完全响应

var req = http.request(httpOptions,function(res) {
    res.setEncoding('utf8');
});

req.on('response',function (responsE) {
    response.on('data',function (chunk) {
        console.log(chunk);
        call@R_197_11442@k(null,JSON.parse(chunk));
    });
});

req.on('error',function(E) {
    call@R_197_11442@k(E);
    //call@R_197_11442@k(e.messagE);
});

req.end();

在结束请求之前有没有办法等待完整的输出？我做错了吗？谢谢！