Large file range request serving

Design the origin-shield + range-request serving layer for delivering very large media files (multi-GB video masters, game installers) from a blob store through a CDN, where clients (download managers, video players) constantly issue HTTP Range requests for arbitrary byte ranges and resume interrupted downloads. The problems: a cold-popular large file triggers many overlapping range requests that all miss and stampede the origin; partial-content responses must cache correctly; and a flaky client resuming at byte 4GB must not re-download from zero. Scale: tens of Gbps egress, files up to 100GB.