file download proxied stream from vercel

pages/api/proxy.ts

@@ -0,0 +1,29 @@
+import axios from 'axios'
+import type { NextApiRequest, NextApiResponse } from 'next'
+
+export default async function handler(req: NextApiRequest, res: NextApiResponse) {
+  // 'inline' is used for previewing PDF files inside the browser directly
+  const { url, inline = false } = req.query
+
+  const decodedUrl = decodeURIComponent(url as string)
+  const { headers, data: stream } = await axios.get(decodedUrl, {
+    responseType: 'stream',
+  })
+
+  // Check if requested file is PDF based on content-type
+  if (headers['content-type'] === 'application/pdf' && inline) {
+    console.log(headers['content-disposition'])
+
+    // Get filename from content-disposition header
+    const filename = headers['content-disposition'].split('filename*=')[1]
+    // Remove original content-disposition header
+    delete headers['content-disposition']
+    // Add new inline content-disposition header along with filename
+    headers['content-disposition'] = `inline; filename*=UTF-8''${filename}`
+    console.log(headers['content-disposition'])
+  }
+
+  // Send data stream as response
+  res.writeHead(200, headers)
+  stream.pipe(res)
+}