I'm trying to edit metadata via REST API but I can't get it to work. 
Documentation says that entrypoint looks like this: PUT /items/{item 
id}/metadata - Update metadata in item. You must put a MetadataEntry

When I try with CURL: 
curl -X PUT -H "Content-Type: application/json" -d 
'{"key":"dc.description.abstract", 
"value":"hello", "language":"no"}' 
"http://dummy_dspace_address.com:8080/rest/items/0000c4c0-7e11-4a18-bf94-8192275e50e4/metadata";

result is this:
Can not deserialize instance of org.dspace.rest.common.MetadataEntry[] out 
of START_OBJECT token at [Source: org.glassfish.jersey.message.internal.
ReaderInterceptorExecutor$UnCloseableInputStream@7780731e; line: 1, column: 
1]


If I try like this:
curl -X PUT -H "Content-Type: application/json" -d 
"key=dc.description.abstract&value=hello&language=no" 
"http://dummy_dspace_address.com:8080/rest/items/0000c4c0-7e11-4a18-bf94-8192275e50e4/metadata";

I get this:
Unrecognized token 'key': was expecting ('true', 'false' or 'null') at [
Source: org.glassfish.jersey.message.internal.
ReaderInterceptorExecutor$UnCloseableInputStream@5c8c7a38; line: 1, column: 
5]

REST API is working otherwise, I can log in etc. I also tried with cookies 
enabled (i.e as an authenticated user) but there was no difference.

What am I doing wrong?





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