pub fn iter<'a>(&'a self) -> impl Iterator<Item = HeaderName> + 'a {
        self
            .0
            .iter()
            .filter_map(|s| {
                s.parse().ok()
            })
    }
/// Returns an iterator over `HeaderName`s contained within.
Returns an iterator over `HeaderName`s contained within.
Returns an iterator over ` HeaderName ` s contained within .
pub fn iter<'a>(&'a self) -> impl Iterator<Item = HeaderName> + 'a {
        self
            .0
            .iter()
            .filter_map(|s| {
                s.parse().ok()
            })
    }
pub fn iter < ' a > ( & ' a self ) -> impl Iterator < Item = HeaderName > + ' a { self . 0 . iter ( ) . filter_map ( | s | { s . parse ( ) . ok ( ) } ) }
Returns an iterator over `HeaderName`s contained within.
Returns an iterator over ` HeaderName ` s contained within .
&'a self
&'a self