Downloads a secret file in data chunks.

DOES NOT TAKE BODY ARGUMENTS.
The following are required query parameters:
- FilePath: holds reference to the filename, filesize, actual filepath for the file being uploaded.
Information returned from
- comp: 'blocklist' to indicate end-of-list, or 'block' to continue
- blockid: The block id on continuation

         IMPORTANT: The FilePath can be used only once. Once download is successful, the path is marked as stop_upload.  
         
         The response body contains file data
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