fix: Use separate header object for each upload in Transfer Manager MPU (#1595)

MattIrv · chandra-siri · web-flow · commit 0d867bd4f405 · 2025-10-31T11:38:16.000Z
Co-authored-by: Chandra Shekhar Sirimala &lt;chandrasiri@google.com&gt;
diff --git a/google/cloud/storage/transfer_manager.py b/google/cloud/storage/transfer_manager.py
@@ -1136,7 +1136,7 @@ def upload_chunks_concurrently(
                     end=end,
                     part_number=part_number,
                     checksum=checksum,
-                    headers=headers,
+                    headers=headers.copy(),
                     retry=retry,
                 )
             )

Original file line number	Diff line number	Diff line change
`@@ -1136,7 +1136,7 @@ def upload_chunks_concurrently(`
`1136`	`1136`	`end=end,`
`1137`	`1137`	`part_number=part_number,`
`1138`	`1138`	`checksum=checksum,`
`1139`		`- headers=headers,`
	`1139`	`+ headers=headers.copy(),`
`1140`	`1140`	`retry=retry,`
`1141`	`1141`	`)`
`1142`	`1142`	`)`