Function CopyAll

httpheaders/copy.go:18–29

CopyAll copies all headers from one header to another.

(from, to http.Header, overwrite bool)

// CopyAll copies all headers from one header to another.
func CopyAll(from, to http.Header, overwrite bool) {
	for key, values := range from {
		// Keys in http.Header are already canonicalized, so no need for http.CanonicalHeaderKey here
		if !overwrite && len(to.Values(key)) > 0 {
			continue
		}

		if len(values) > 0 {
			to[key] = append([]string(nil), values...)
		}
	}
}

// CopyFromRequest copies specified headers from the http.Request to the provided header.
func CopyFromRequest(req *http.Request, header http.Header, only []string) {