CoreFaceDetector
Face finding web service on net core 3.1 and https://github.com/shimat/opencvsharp
Just run and give it a photo from internet: http://localhost:59642/face/detect?uri=http://example.com/picture.jpg
Or from the file system uri=file://C:/downloads/picture.jpg
Response is 404 if there no faces or biggest face {"rectangle":"829,254,570,570"}