Nginx hack day project

I was trying to think of a hack day project, and one idea was to
a blob server similar to Facebook’s haystack. Facebook did their server
with the evhttpd library, I was thinking of making it an nginx module.
order to make it work I’d need to have nginx send a range of bytes from
larger file as bytes 0…x of the requested object. Is there a capability
do that within Nginx?

I could only find one module that did something similar, and it copied
data it wanted to a seperate file before sending it. However, it was an
module so it might not represent the abilities of modern nginx.