From ad88b68a467b6b3cb9d6a8a24f0ec74e8aa77565 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Sat, 14 Feb 2026 08:00:03 +0100
Subject: [PATCH] internal/download: show progress bar only if server gives
 length (#33842)

Fixes this:
https://ci.appveyor.com/project/ethereum/go-ethereum/builds/53538177/job/ptosr48pvvwkjskb#L43
---
 internal/download/download.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/internal/download/download.go b/internal/download/download.go
index 26c7795ce5..c59c8a90c3 100644
--- a/internal/download/download.go
+++ b/internal/download/download.go
@@ -205,7 +205,10 @@ func (db *ChecksumDB) DownloadFile(url, dstPath string) error {
 	if err != nil {
 		return err
 	}
-	dst := newDownloadWriter(fd, resp.ContentLength)
+	var dst io.WriteCloser = fd
+	if resp.ContentLength > 0 {
+		dst = newDownloadWriter(fd, resp.ContentLength)
+	}
 	_, err = io.Copy(dst, resp.Body)
 	dst.Close()
 	if err != nil {