HTTPS websites not showing in proxy

The proxy server doesn't seem to be logging any HTTPS sites, which I can access just fine through the browser. Other sites are being logged just fine. Any ideas why?

Most of the time the proxy

Most of the time the proxy will get HTTPS just fine, but sometimes there is extra security on the site that interrupts the proxy as a man-in-the-middle attack. In that case I have to look at another proxy like Charles Proxy. Then I have to make my scrapeable file requests manually.