I'm using a self-signed certificate in a private network that will expire after several days. I need a certificate just to exploit its keys to set up https connections. Therefore, a self-signed is enough in my case.
I'm already using curl -k https://mylocal.url.local to overcome problems about the signature. I'm wondering if it will still work also after the expiration date.
Yes, use of -k also prevents checking the validity of a certificate as can be seen here:
As you can see this used curl on Windows (10 in this case), but I receive similar output on Ubuntu and - what is even more important - the same reaction when -k is added:
curl: (60) SSL certificate problem: certificate has expired
As far as your side question is concerned: with all these browsers I was able to ignore the warning about the expired certificate:
My installation of Postman ignored the expired certificate from the beginning. I don't remember if this was an installation default or if I changed it to off a long time ago:
