Cargo Features

khttp has no features set by default.

[dependencies]
khttp = { version = "0.2.0", features = ["client", "epoll"] }
client
epoll = libc

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.

libc epoll?