Following call does not return any data, but is expected to return data for 4 days:
curl -X GET "https://apiservice.borsdata.se/v1/instruments/1181/stockprices?authKey="your key"&from=2019-04-09&to=2019-04-12" -H "accept: application/json"
While this call returns a list of data for 5 days:
curl -X GET "https://apiservice.borsdata.se/v1/instruments/1181/stockprices?authKey="your key"&from=2019-04-08&to=2019-04-12" -H "accept: application/json"