pieper opened a new issue #166: get part of an attachment using http range requests URL: https://github.com/apache/couchdb-nano/issues/166 <!--- Provide a general summary of the issue in the Title above --> Couchdb supports [HTTP Range Requests](http://docs.couchdb.org/en/stable/api/document/attachments.html#api-doc-attachment-range) but as far as I could see nano does not expose that. ## Expected Behavior <!--- If you're describing a bug, tell us what should happen --> <!--- If you're suggesting a change/improvement, tell us how it should work --> I would expect that the get/getAsStream opts object would include a range member so that resulting stream would only include the specified byte range of the attachment. ## Current Behavior <!--- If describing a bug, tell us what happens instead of the expected behavior --> <!--- If suggesting a change/improvement, explain the difference from current behavior --> As far as I can tell it's only possible to get the full attachment data. ## Possible Solution <!--- Not obligatory, but suggest a fix/reason for the bug, --> <!--- or ideas how to implement the addition or change --> As noted in the Couchdb documentation linked above, it should be as simple as adding a header like `Range: bytes 0-12` when GETing the attachment. ## Steps to Reproduce (for bugs) <!--- Provide a link to a live example, or an unambiguous set of steps to --> <!--- reproduce this bug. Include code to reproduce, if relevant --> Don't have a way to reproduce - this is more of a feature question. ## Context <!--- How has this issue affected you? What are you trying to accomplish? --> <!--- Providing context helps us come up with a solution that is most useful in the real world --> We are working on an implementation of the [DICOMweb standard](https://www.dicomstandard.org) whereby medical image volumes and other data are accessed over a rest api. [Our implementation](https://github.com/dcmjs-org/dicomweb-server) uses fastify and couchdb (nano) and it mostly works well. The metadata is stored in couchdb and the image data is in attachments. However the DICOMweb API supports requesting a single frame (slice) out of a full volume and we'd like to be able to access that efficiently using a range request to pull just the needed frame information from the volume. ## Your Environment <!--- Include as many relevant details about the environment you experienced the bug in --> * Version used: 7.1.1 * Link to your project: https://github.com/dcmjs-org/dicomweb-server
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