Cargo Features

[dependencies]
user_agent = { version = "0.11.0", default-features = false, features = ["preserve_order", "default-tls", "rustls-tls"] }
default = default-tls, preserve_order

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

preserve_order default

Enables preserve_order of cookie_store ^0.12.0

cookie_store:

uses indexmap::IndexMap in lieu of HashMap internally, so cookies are maintained in insertion/creation order

default-tls default

Enables default-tls of reqwest ^0.10.6

reqwest:

Note: this doesn't enable the 'native-tls' feature, which adds specific functionality for it.

rustls-tls

Enables rustls-tls of reqwest ^0.10.6

user_agent has 4 features without comments.