Cargo Features

[dependencies]
nano-get = { version = "0.2.4", default-features = false, features = ["http", "https"] }
default = http

The http feature is set by default whenever nano-get is added without default-features = false somewhere in the dependency tree.

http default
https = 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.

openssl https?