Function ExtractHeader

api/http_client.go:175–187

ExtractHeader extracts a named header from any response received by this client and, if non-blank, saves it to dest.

(name string, dest *string)

// ExtractHeader extracts a named header from any response received by this client and,
// if non-blank, saves it to dest.
func ExtractHeader(name string, dest *string) func(http.RoundTripper) http.RoundTripper {
	return func(tr http.RoundTripper) http.RoundTripper {
		return &funcTripper{roundTrip: func(req *http.Request) (*http.Response, error) {
			res, err := tr.RoundTrip(req)
			if err == nil {
				if value := res.Header.Get(name); value != "" {
					*dest = value
				}
			}
			return res, err
		}}
	}
}

type funcTripper struct {
	roundTrip func(*http.Request) (*http.Response, error)