[ARROW-12746] [Go][Flight] Client Auth handler overwrites outgoing metadata

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.1, 5.0.0
• Component/s: FlightRPC, Go
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/28488
• Assignee: Matthew Topol
• Reporter: Matthew Topol
• Created: 11/May/21 22:27
• Updated: 11/Jan/23 08:28
• Resolved: 13/May/21 16:05

Description

Current version of the Flight Client AuthHandler calls `NewOutgoingMetadata` instead of `AppendToOutgoingContext` which results in overwriting any metadata that was being passed in the request. Switching it to `AppendToOutgoingContext` alleviates the issue by adding the auth header to the metadata without overwriting any existing metadata.

Issue Links

• links to: GitHub Pull Request #10297