How to receive and forward ZIP files using attachments with HTTP Listener → HTTP Sender?

[ArjunAsokan01]

Hi team,

I’m working on a BridgeLink channel where I need to receive a ZIP file and forward it to another API using the attachment mechanism.

Current setup:

• HTTP Listener (Source) successfully receives the ZIP file as an attachment.

• On the HTTP Sender (Destination) side, I’m unable to find a clear way to:

  • Attach the received ZIP file to the outgoing request
  • Map the source attachment to a multipart form field
  • Preserve or specify the attachment filename when forwarding the file

The downstream API (Spring Boot) expects the ZIP file as multipart/form-data with a file part and filename, and it works correctly when tested via Postman or curl.

However, in BridgeLink:

• There is no visible option to configure attachment name or filename in the HTTP Sender

• It’s unclear whether an extension is required or if there is a recommended configuration for this use case

Has anyone successfully:

• Received a ZIP file via HTTP Listener, and
• Forwarded the same ZIP file to another API using HTTP Sender as an attachment?

Any guidance, examples, or best-practice recommendations would be greatly appreciated.

Thanks!