From b83814082b702a3239ba1f4b0521d6d109126998 Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Mon, 16 Apr 2018 19:40:02 +0100
Subject: [PATCH] backend/http: if HEAD didn't return Content-Length use -1 as
 size

This means that the files will be treated as an unknown length and
will download properly.

Fixes #2247
---
 backend/http/http.go | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/backend/http/http.go b/backend/http/http.go
index f289f6f2d..05437b8a8 100644
--- a/backend/http/http.go
+++ b/backend/http/http.go
@@ -189,10 +189,11 @@ func (f *Fs) url(remote string) string {
 	return f.endpointURL + rest.URLPathEscape(remote)
 }
 
-func parseInt64(s string) int64 {
+// parse s into an int64, on failure return def
+func parseInt64(s string, def int64) int64 {
 	n, e := strconv.ParseInt(s, 10, 64)
 	if e != nil {
-		return 0
+		return def
 	}
 	return n
 }
@@ -409,7 +410,7 @@ func (o *Object) stat() error {
 	if err != nil {
 		t = timeUnset
 	}
-	o.size = parseInt64(res.Header.Get("Content-Length"))
+	o.size = parseInt64(res.Header.Get("Content-Length"), -1)
 	o.modTime = t
 	o.contentType = res.Header.Get("Content-Type")
 	return nil