Function copyHeaders

cache/client/handler.go:204–229

(dst, src http.Header)

}

func copyHeaders(dst, src http.Header) {
	// Clone returns a copy of h or nil if h is nil.
	if src == nil {
		return
	}

	// Find total number of values.
	nv := 0
	for _, vv := range src {
		nv += len(vv)
	}

	sv := make([]string, nv) // shared backing array for headers' values
	for k, vv := range src {
		if vv == nil {
			// Preserve nil values. ReverseProxy distinguishes
			// between nil and zero-length header values.
			dst[k] = nil
			continue
		}

		n := copy(sv, vv)
		dst[k] = sv[:n:n]
		sv = sv[n:]
	}
}