Hub gateway doesn't support HTTP Range queries

[carsonfarmer]

The default IPFS gateway's support this HTTP header, which is pretty much required for serving video content. Currently, our gateway does not. In fact, browser apps get a CORS error on preflight requests because we don't support this header. Is there an easy path to supporting Range Queries?

cc @sanderpick

[carsonfarmer]

There are essentially two components to this issue. One is simply allowing HTTP Range headers in the first place, and the second is then actually supporting partial requests and range queries. The default IPFS gateway uses the built in Golang http.serveContent() method, which should be properly parsing Range HTTP headers and only returns the content in the range the client requested, so we would likely have to do something similar, or support Range HTTP headers directly ourselves.