怎么解决点击下载Csv文件时在浏览器里面打开，而不是下载

php处理程序为：

downloadcsv.php

<?php
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=\"".$_GET['id'].".csv\"");
$data = file_get_contents("Csv/".$_GET['id'].".csv");
echo $data;

html页面为：

<a href="downloadcsv.php?id=noDataRecord"><span style="color:red;">noDataRecord.csv</span></a>

so

done