recently I came across this issue when I exposed my port via ngRok. I simply forwarded it but when I tried to open the ngRok url I got Deceptive site ahead warning. Here is the image of the warning.
It was a django server with graphql and I wanted to test graphiql. (this point might not be necessary for the reader but more info is always better than no info)
So the solution I found was to click on the red empty area and type "thisisunsafe" (without quotes of-course)
PS: I searched for the solution but couldn't find any I hope this will help others who are looking for the same.
Another workaround that I found is using that same URL in an incognito window. I'm not sure why the security is more lax there...but it works.
