如何从 url 获取远程 PDF 并使用 Express js 发送到客户端？

Question

I would like to fetch a pdf from a URL and send it to the client in an Express (JS) application via a REST endpoint. However, most resources are focused on sending a PDF file located on the local file system.

Answer 1

Here is a simple example that works great.

const axios = require('axios');
const express = require('express');

const app = express();

const url = 'https://example.com/file';
const fileName = 'pdf-file';

app.get('/', async (req, res) => {
  const stream = await axios.get(url, { responseType: 'stream' });
  res.setHeader('Content-Type', 'application/pdf');
  res.setHeader('Content-Disposition', `inline; filename=${fileName}.pdf`);
  return stream.data.pipe(res);
});

app.listen(3000);