// Add adds the key, value pair to the header.
// It appends to any existing values associated with key.
Add adds the key, value pair to the header.
It appends to any existing values associated with key.
// Add adds the key value pair to the header . // It appends to any existing values associated with key .
func (h *headers) Add(key, value string) {
	if h.head == nil {
		h.head = make(http.Header)
	}
	h.head.Add(key, value)
}
func ( h * headers ) Add ( key , value string ) { if h . head == nil { h . head = make ( http . Header ) } h . head . Add ( key , value ) }
Add adds the key, value pair to the header.
Add adds the key value pair to the header .