rws-http 18.26.0

The HTTP layer of rust-web-server (internal: use the rust-web-server crate).
Documentation 
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//! `103 Early Hints` links: what a usable `Link` value is. The middleware
//! that sends them is rust-web-server's `early_hints`.

/// A usable `Link` value: not empty, no CR, LF or NUL.
pub fn valid(link: &str) -> bool {
    !link.trim().is_empty() && !link.bytes().any(|b| matches!(b, b'\r' | b'\n' | 0))
}