Cargo Features

comment_app_frontend has no features set by default.

[dependencies]
comment_app_frontend = { version = "0.1.3", features = ["tls"] }
tls = tokio-rustls

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.

tokio-rustls tls?

Enables tokio-rustls ^0.13.1