后端从第三方获取 pdf。 我如何通过 REST api 发送给我的客户？

Question

I get a pdf from a third party. I save the file on S3. I can see the file on S3 and when I open it I can see my PDF. However, when I passed the pdf to the client and check it on Postman I get an empty PDF.

Here is my code:

public async getReportFromThirdParty(token) {
    const params = {
        headers: { Authorization: `Bearer ${token}`},
        responseType: "arraybuffer",
    }  

    let report = {};
    report = await axios.get(`https://api.thirdparty.com/api/get-pdf`, params);
    return report.data;
}


app.post("/download", async (req, res) => {
   const token = 'abcde-secret-token';
   const pdf = await getReportFromThirdParty(token);
   await saveToS3(pdf) // <---- I checked and it saves the file properly on S3 as PDF
 
   res.contentType("application/pdf");
   return res.status(200).send(pdf); // <--- this returns an empty pdf file
});

Any ideas?

Answer 1

im going to guess your app is an node express app so therefore you likely need to

res.sendFile();

More info found on the express site