Getting the request headers can be done using the HttpRequest.headers() method. A similar method exists in HttpResponse for getting the headers of the response. Both methods return an HttpHeaders object.

Both of these methods can be used in the same way, so let's focus on getting the response headers. We can get the headers like so:

HttpResponse<...> response ...
HttpHeaders allHeaders = response.headers();

Getting all of the values of a header can be done using HttpHeaders.allValues(), as follows:

List<String> allValuesOfCacheControl
  = response.headers().allValues("Cache-Control");

Getting only the first value of a header can be done using HttpHeaders.firstValue(), as follows:

Optional<String> firstValueOfCacheControl
  = response.headers().firstValue("Cache-Control");