From 599b0fa8e265bfa81603156f158dbbfafd02bf6c Mon Sep 17 00:00:00 2001
From: Christian Vidal Wolf <christianvidalwolf@gmail.com>
Date: Fri, 16 Jan 2026 14:20:08 +0100
Subject: [PATCH] fix: robust handling of Dropbox URLs in proxy with query
 params

---
 api/dropbox/[...path].ts | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/api/dropbox/[...path].ts b/api/dropbox/[...path].ts
index 1a98185..c53842b 100644
--- a/api/dropbox/[...path].ts
+++ b/api/dropbox/[...path].ts
@@ -27,9 +27,22 @@ export default async function handler(req: VercelRequest, res: VercelResponse) {
         const requestPath = req.url || '';
         const dropboxPath = requestPath.replace(/^\/api\/dropbox/, ''); // e.g. /scl/fi/xyz?dl=1
 
-        const targetUrl = `https://www.dropbox.com${dropboxPath}`;
+        let targetUrl = `https://www.dropbox.com${dropboxPath}`;
 
-        console.log(`Proxying to: ${targetUrl}`);
+        // Ensure dl=1 is present to force download
+        if (targetUrl.includes('?')) {
+            if (!targetUrl.includes('dl=1')) {
+                targetUrl = targetUrl.replace('dl=0', 'dl=1');
+                if (!targetUrl.includes('dl=1')) {
+                    targetUrl += '&dl=1';
+                }
+            }
+        } else {
+            targetUrl += '?dl=1';
+        }
+
+        console.log(`[Proxy] Incoming: ${req.url}`);
+        console.log(`[Proxy] Target: ${targetUrl}`);
 
         const response = await fetch(targetUrl);