FourDN Get Download URL

Get download URL and DRS (Data Repository Service) API endpoint for 4DN files. Prerequisites: (1) Requires file accession - obtain by using FourDN_search_data with item_type='File'. (2) Requires free 4DN account - create at data.4dnucleome.org, then generate access key in your profile settings. Returns download URL and instructions for command-line access with curl. Supports GA4GH DRS standard for interoperability. Use for: programmatic file download, batch processing, workflow integration.