Cargo Features

actix-server-config has no features set by default.

[dependencies]
actix-server-config = { version = "0.3.0-alpha.1", features = ["openssl"] }
openssl = tokio-openssl

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

tokio-openssl openssl?

Enables tokio-openssl ^0.4.0-alpha.6