Comment by dspillett

Most web servers do out of the box, so I would assume most do. Basically all unless they have some reason to turn range processing off or are running a custom/experimental/both server that have implemented the feature (yet).

Not supporting range requests would be a disadvantage for any service hosting large files. Resuming failed long downloads wouldn't work so users might not be happy and there would be more load on your bandwidth and other resources as the AU falls back to performing a full download.