Cargo Features

[dependencies]
instant-acme = { version = "0.7.2", default-features = false, features = ["aws-lc-rs", "fips", "hyper-rustls", "ring"] }
default = hyper-rustls, ring

These default features are set whenever instant-acme is added without default-features = false somewhere in the dependency tree.

aws-lc-rs fips?

Enables aws-lc-rs, aws_lc_rs of rcgen, aws-lc-rs of optional hyper-rustls

fips = aws-lc-rs

Enables fips of optional aws-lc-rs

aws-lc-rs:

require FIPS

hyper-rustls default

Enables hyper, hyper-rustls, and hyper-util

ring default

Enables ring, ring of rcgen and optional hyper-rustls

instant-acme has 5 features without comments.