Cargo Features

[dependencies]
async_docker = { version = "0.1.1", default-features = false, features = ["ssl", "without-ssl"] }
default = without-ssl

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

ssl = hyper-openssl, openssl
without-ssl default

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-openssl ssl?

Enables hyper-openssl ^0.6

openssl ssl?