support for .p12/.pfx files for mTLS

[cplussharp]

Hi,
I would like to use a .p12 file for mTLS.
This is currently not possible, because the code checks for "key" and "certificate" in the https options.
If they are not present the code should check for "pfx".

[panva]

Sounds good. Would you like to open a PR?

[cplussharp]

Yes, I can do this. I never worked with discussions before. Can I reference this discussion like an issue?

[panva]

Same as any other issue. #{number}