Alright, the user is asking about the HTTPS proxy variables. They want to know the variable names related to HTTPS proxy setup. 

Looking at the markdown, I need to find the section under the "proxy_mode" variable that's specifically for HTTPS. 

I see a section labeled "HTTPS Proxy" which is under the "manual" path. This section contains the details about the variables used for HTTPS proxy configuration.

Now, I should list each variable and its description. The variables mentioned are:

1. manual.https_proxy.address: This is the HTTPS proxy address. It's mandatory and can be an IP address or a domain name.

2. manual.https_proxy.port: This sets the HTTPS proxy port. It's mandatory and can be any well-known, registered, or private port. The default is 8080, but it's set to the same as the 
HTTP proxy port if not specified.

3. manual.use_for_https: This is a boolean variable that determines if the proxy should be used for HTTPS traffic. It's mandatory and defaults to true.

I should present these variables clearly, explaining each one's purpose and default values. This way, the user can understand how to configure their HTTPS proxy settings based on the 
documentation.