Cargo Features

digest-access = { version = "0.3.5", default-features = false, features = ["from-headers"] }
default = from-headers

The from-headers feature is set by default whenever digest-access is added without default-features = false somewhere in the dependency tree.

from-headers default = http

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.

http from-headers