What is it called when the JSON REST API accepts a list of ids and returns it, but notes which are in the server database and which are not?

Question

API

What is it called when the JSON REST API accepts a list of ids and returns it, but notes which are in the server database and which are not?

Answer 1

It's called that this is not a REST API
You have Id'sfrom some entities. Imagine that from collection1
To play your script and stay in REST. You need to send a GET request with Id.
The entities that will return are in the DB, otherwise absent. If you only need Id's, then add a parameter fieldsand a value to the requests id. And this is already beginning to move away from the "classical", and becomes the object of controversy and philosophical conclusions.
Examples:
1)

{host}/{restapi}/collection1?id="id1"&id="id2"&id="id3"

2)

{host}/{restapi}/collection1?id="id1"&id="id2"&id="id3"&fields=id

3)

{host}/{restapi}/collection1?id=["id1","id2","id3"]&fields=id

Example 1) correct, 2) good, example 3) bad