I need to send data to some backend servers using HTTPS, but it seems like nginx doesn't verify the certificate on the backend server. For instance, if I specify `proxy_pass https://example.com` and the certificate on example.com is invalid, nginx still completes the request without any warning.

I'd prefer it if nginx checked whether the certificate could be verified during the SSL handshake, and abort the request if the certificate isn't valid.

Is it possible to somehow enable certificate verification of the proxied server's certificate? And if it's not possible to verify the certificate, what's the point in using (or being able to use) an HTTPS backend then?

The reason I need SSL encryption is that traffic from my nginx server will be passed via public networks to the backend servers.

Thanks,
Rune