Add Range support to file middleware

[creationix]

It would be great if the file middleware supported range requests. This way strata could be used for html video streaming (with full seek support). Here is how I implemented it most recently in vfs-http https://github.com/c9/vfs/blob/master/http-adapter/restful.js#L82-93

[mjackson]

I agree. I've wanted to put in Range support for a while now but just haven't gotten around to it yet. Thanks for the pointer to your work. Will be really helpful in implementing this.

[creationix]

I will mention that if you go for E-Tag support for the 304 implementation, then there is etag + range interaction I implemented in http-adapter/restful as well. It took me some time reading the somewhat inconsistent specification on what a server should do in that case.