Cargo Features

[dependencies]
etcd = { version = "0.9.0", default-features = false, features = ["tls"] }
default = tls

The tls feature is set by default whenever etcd is added without default-features = false somewhere in the dependency tree.

tls default = hyper-tls, native-tls

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-tls tls

Enables hyper-tls ^0.3.1

native-tls tls