rstreamor

https://github.com/ndea/rstreamor

Rstreamor gives you the power to stream your files using the HTTP range requests defined in the HTTP/1.1. Range requests are an optional feature of HTTP, designed so that recipients not implementing this feature (or not supporting it for the target resource) can respond as if it is a normal GET request without impacting interoperability. Partial responses are indicated by a distinct status code to not be mistaken for full responses by caches that might not implement the feature.