/// Add a new header field into the request.
Add a new header field into the request.
Add a new header field into the request .
fn add_header<N, V>(mut self, name: N, value: V) -> Request
        where N: ToString, V: ToString {
        self.headers.push((name.to_string(), value.to_string()));
        self
    }
fn add_header < N , V > ( mut self , name : N , value : V ) -> Request where N : ToString , V : ToString { self . headers . push ( ( name . to_string ( ) , value . to_string ( ) ) ) ; self }
Add a new header field into the request.
Add a new header field into the request .
mut self
name
N
value
V