Unable to Log Python List Objects Using Graylog

I am trying to send Python List as Log Message to Graylog. The approach that i am using is “Sending GELF messages via HTTP using curl” mentioned in http://docs.graylog.org/en/2.4/pages/gelf.html

But when i send data as below:

curl -X POST -H 'Content-Type: application/json' -d '{"log_type":"debug", "short_message": "[1,4,5,2]", "block_id":"TEST_LOGGING"}' 'http://<host>:12201/gelf'

it works perfectly fine.

Where as on sending message as below Logs nothing.

curl -X POST -H 'Content-Type: application/json' -d '{"log_type":"debug", "short_message": [1,4,5,2], "block_id":"TEST_LOGGING"}' 'http://<host>:12201/gelf'

I am unable to figure out the issue.

you message does not contain all needed information to be a valid GELF message …

@jan Thanks for your reply.
But why the First one with “[1,4,5,2]” as short_message gets logged. That request also doesn’t contain all the required fields.

what does the Graylog server.log tell you when you ingest the first and the last message?