Express-从Web服务返回二进制数据 [英] Express - Return binary data from webservice

问题描述

我尝试使用Express返回一些二进制数据.在示例中，它是PDF，但从理论上讲，它可以是任何类型的文件.

I try to return some binary data with Express. In the example, it's a PDF but theorically, this can be any sort of file.

但暂时将重点放在pdf上.我写了这段代码:

But focus on the pdf for the moment. I wrote this code :

app.get('*', function (req, res) {
    getBinaryData(req.url,
        function (answer) {
            res.type('pdf');
            res.end(new Buffer(answer, 'binary'));
        },
        function (error) {
            res.setHeader('Content-Type', 'text/plain');
            return res.end(error);
        }
    );
});

基于我在这里看到的内容: https://github.com/strongloop/express/issues /1555

Based on what I saw here : https://github.com/strongloop/express/issues/1555

但是，我得到的PDF文件具有正确的页数，正确的标题....但是所有页面都是空白

But, i get a pdf file with the right number of pages, right title.... but all the pages are blank

我肯定会担心getBinaryData()的返回，因为此函数询问了外部Web服务，而当我直接询问此服务时，我得到了正确的文档.

I'm sure concern the return of getBinaryData(), because this function asked an external Web Service and when I asked directly this service, I got the right document.

预先感谢您的回答

推荐答案

我找到了一个更简单的解决方案:

I found a more simple solution :

request(req.url).pipe(res);

这会将来自远程Web服务的原始响应直接传递给我的响应！无论文件类型如何，我都能得到正确的文件.

This pipes the original response from distant Web Service directly to my response! I got the correct file regardless of the file type.

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