Cargo Features

lineapi has no features set by default.

[dependencies]
lineapi = { version = "0.2.6", features = ["rustls-tls"] }
default

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

Enables default-tls of reqwest

reqwest:

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

rustls-tls

Enables rustls-tls of reqwest

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.

reqwest default rustls-tls?