Max retries exceeded with url: /plain

[luisenriqueramos1977]

Wenn using this code:

def query_raw(text, url="https://bern.korea.ac.kr/plain"):
"""Biomedical entity linking API"""
return requests.post(url, data={'sample_text': text}).json()

the_result=query_raw('Scientists use techniques which can damage cells such as multi-layering of a variety of cells and the transition of cell-matrix droplets onto a substrate known as ink-jet printing by amplifying a laser pulse.')

I get this error:

ConnectionError: HTTPSConnectionPool(host='bern.korea.ac.kr', port=443): Max retries exceeded with url: /plain (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x00000198277E8DD0>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it'))

Could you tell me which could be the issue?.

Best regards

Luis Ramos