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fn is_ws(b: u8) -> bool {
b == b' ' || b == b'\t' || b == b'\n' || b == b'\r' || b == 11u8 || b == 12u8
}
pub fn header_field_ok(s: &[u8]) -> bool {
let mut ok = true;
let mut i = 0usize;
while i < s.len() {
if s[i] >= 128 || is_ws(s[i]) {
ok = false;
}
i += 1;
}
ok
}