nicolas-albert opened a new issue #3328:
URL: https://github.com/apache/couchdb/issues/3328
## Description
The _bulk_get service allows to retrieve multiple documents with their
attachments. If the client already have a revision of a document, the
atts_since option allows to not reply an unmodified attachment again.
In this case, the part is incorrect:
```
----68dd74e8c5bb2822e23a8ada6eeb2619
X-Doc-Id: att_10
X-Rev-Id: 3-a50b011b678507001e15d904295bccf1
Content-Type: multipart/related; boundary=--c994d3e17aee82de2d947e57171e97ad
{"_id":"att_10","_rev":"3-a50b011b678507001e15d904295bccf1","data":"data_10","_revisions":{"start":3,"ids":["a50b011b678507001e15d904295bccf1","3d2ba9b990fa62a3aeabc75f86aaace8","167072636fface8c96ec4eb1cb915814"]},"_attachments":{"text.txt":{"content_type":"text/plain","revpos":2,"digest":"md5-VviK0JqDf+w9vDhCLZSI5Q==","length":11,"stub":true,"encoding":"gzip","encoded_length":31}}}
----68dd74e8c5bb2822e23a8ada6eeb2619
```
The part declares a sub multipart/related with a boundary never used and the
application/json Content-Type isn't set.
The couchbaselite-java (1.4.x) library break the replication because of this
nonsense.
## Steps to Reproduce
Take a document with an attachment, note its revision and make a new
revision:
`curl -H "Accept: multipart/related" -H "Content-Type: application/json" -d
'{"docs":[{"atts_since":["x-oldrev"],"rev":"y-newrev","id":"mydoc"}]}'
"http://localhost:5984/mydb/_bulk_get?revs=true&attachments=true"`
Should also works with multiple docs for the same query.
## Expected Behaviour
Instead, we should have something like this:
```
----68dd74e8c5bb2822e23a8ada6eeb2619
X-Doc-Id: att_10
X-Rev-Id: 3-a50b011b678507001e15d904295bccf1
Content-Type: multipart/related; boundary=--c994d3e17aee82de2d947e57171e97ad
----c994d3e17aee82de2d947e57171e97ad
Content-Type: application/json
{"_id":"att_10","_rev":"3-a50b011b678507001e15d904295bccf1","data":"data_10","_revisions":{"start":3,"ids":["a50b011b678507001e15d904295bccf1","3d2ba9b990fa62a3aeabc75f86aaace8","167072636fface8c96ec4eb1cb915814"]},"_attachments":{"text.txt":{"content_type":"text/plain","revpos":2,"digest":"md5-VviK0JqDf+w9vDhCLZSI5Q==","length":11,"stub":true,"encoding":"gzip","encoded_length":31}}}
----c994d3e17aee82de2d947e57171e97ad--
----68dd74e8c5bb2822e23a8ada6eeb2619
```
## Your Environment
* CouchDB version used: tested with CouchDB 2.3.1 and 3.1.1
* Operating system and version: docker versions
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