DSpace 7 supports the HTTP Range header on the bitstream content endpoint. We can use this to just get parts of a bitstream, pause and resume downloads using a download manager or for other features such as basic HTML 5 video streaming. DSpace advertises this support with the
"Accept-Ranges: bytes" response header.
The Range header indicates which part of a bitstream the server should return, currently we support the following formats:
Range: bytes=<range-start>-<range-end>, <range-start>-<range-end>, <range-start>-<range-end>
For more information: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Range
Note that DSpace only supports bytes as the unit.
For the ETAG response header is populated with the checksum of a bitstream. This should allow users to check if a bitstream has been updated using a HTTP Head request.
The following other HTTP-headers are supported
|If-None-Match||If this is equal to the checksum of the requested bitstream, a 304 will be returned.|
|If-Modified-Since||The bitstream will only be returned if it has been modified since the given date|
|If-Match||Only returns the bitstream if If-Match contains the checksum or "*"|
|If-Not-Modified-Since||The bitstream will only be returned if it has NOT been modified since the given date|