'Request zero' at GET

API reacts with completed request 0.

/*Thu Nov 26 14:04:59 2020*/ 
request(1, 1606395899.985, [peer(ip(127,0,0,1)),method(get),request_uri('/bg'),path('/bg'),http_version(1-1),content_type('application/json'),user_agent('PostmanRuntime/7.26.8'),postman_token('fc04c4f5-3f71-40a2-b3fe-66fc358a9f10'),host(localhost),port(5000),content_length(735)]).
completed(1, 0.029408105, 630, 200, ok).

completed(0, 0.047579236, 328, 400, error("Illegal HTTP parameter:   { (in_http_request)")).

server(stopped, 1606395987).

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I have no idea at the moment what causes this / where this comes from, but since it does not crop up in Postman or curl, I assume this should not interfere with API functionality from the clients perspective.

Investigating.