pub fn extend_keys_only<I, K>(&mut self, iter: I) -> &mut QueryString
    where
        I: IntoIterator,
        I::Item: Borrow<K>,
        K: AsRef<str>,
    {
        self.urlencoder.extend_keys_only(iter);
        self
    }
/// Serialize and append a number of names without values.
/// This simply calls `append_key_only` repeatedly.
Serialize and append a number of names without values.
This simply calls `append_key_only` repeatedly.
Serialize and append a number of names without values . This simply calls ` append_key_only ` repeatedly .
pub fn extend_keys_only<I, K>(&mut self, iter: I) -> &mut QueryString
    where
        I: IntoIterator,
        I::Item: Borrow<K>,
        K: AsRef<str>,
    {
        self.urlencoder.extend_keys_only(iter);
        self
    }
pub fn extend_keys_only < I , K > ( & mut self , iter : I ) -> & mut QueryString where I : IntoIterator , I :: Item : Borrow < K > , K : AsRef < str > , { self . urlencoder . extend_keys_only ( iter ) ; self }
Serialize and append a number of names without values.
Serialize and append a number of names without values .
&mut self
iter
I
&mut self
iter
I