Cargo Features

[dependencies]
instant-acme = { version = "0.4.3", default-features = false, features = ["hyper-rustls"] }
default = hyper-rustls

The hyper-rustls feature is set by default whenever instant-acme is added without default-features = false somewhere in the dependency tree.

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.

hyper-rustls default

Enables hyper-rustls ^0.24