From 8cd3c25b414c35b1c79114a2f4739d26300c352b Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Tue, 16 Feb 2016 14:45:22 +0000
Subject: [PATCH] Amazon Cloud Drive: retry on 400, 401, 408, 504 and EOF
 errors - fixes #340

---
 amazonclouddrive/amazonclouddrive.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/amazonclouddrive/amazonclouddrive.go b/amazonclouddrive/amazonclouddrive.go
index dc8dfb0a7..f1853c130 100644
--- a/amazonclouddrive/amazonclouddrive.go
+++ b/amazonclouddrive/amazonclouddrive.go
@@ -129,14 +129,21 @@ func parsePath(path string) (root string) {
 
 // retryErrorCodes is a slice of error codes that we will retry
 var retryErrorCodes = []int{
+	400, // Bad request (seen in "Next token is expired")
+	401, // Unauthorized (seen in "Token has expired")
+	408, // Request Timeout
 	429, // Rate exceeded.
 	500, // Get occasional 500 Internal Server Error
 	503, // Service Unavailable
+	504, // Gateway Time-out
 }
 
 // shouldRetry returns a boolean as to whether this resp and err
 // deserve to be retried.  It returns the err as a convenience
 func shouldRetry(resp *http.Response, err error) (bool, error) {
+	if err == io.EOF {
+		return true, err
+	}
 	return fs.ShouldRetry(err) || fs.ShouldRetryHTTP(resp, retryErrorCodes), err
 }