public class HttpHeadersManager {
 private static final int DAY_IN_MINUTES = 3600;
 private final Series<Header> requestHeaders;
 private final Series<Header> responseHeaders;
 public HttpHeadersManager(Series<Header> requestHeaders, Series<Header> responseHeaders) {
 this.requestHeaders = requestHeaders;
 this.responseHeaders = responseHeaders;
 }
 public String getHeaderValue(Series<Header> headers, String name) {
 return headers.getFirst(name) != null ? headers.getFirst(name).getValue() : "";
 }
 public String getAcceptEncoding() {
 return getHeaderValue(requestHeaders, "Accept-Encoding");
 }
 public boolean canAcceptGzip() {
 return getAcceptEncoding().contains("gzip");
 }
 public void setCacheHeaders(String path) {
 if (isNoCache(path)) {
 setNoCacheHeaders();
 } else if (isCache(path)) {
 setCacheHeaders();
 }
 }
 public void setEncodingHeaders() {
 responseHeaders.set("Transfer-Encoding", "chunked");
 }
 private boolean isNoCache(String path) {
 return path.contains(".nocache.");
 }
 private void setNoCacheHeaders() {
 Date now = new Date();
 responseHeaders.set("Date", String.valueOf(now.getTime()));
 responseHeaders.set("Last-Modified", String.valueOf(now.getTime()));
 responseHeaders.set("Expires", "0");
 responseHeaders.set("Pragma", "no-cache");
 responseHeaders.set("Cache-control", "no-cache, must-revalidate, pre-check=0, post-check=0");
 }
 private boolean isCache(String path) {
 return path.contains(".cache.");
 }
 private void setCacheHeaders() {
 final Calendar calendar = Calendar.getInstance();
 calendar.setTime(new Date());
 calendar.add(Calendar.HOUR, 24);
 responseHeaders.set("Expires", String.valueOf(calendar.getTime().getTime()));
 responseHeaders.set("Cache-control", "max-age=" + DAY_IN_MINUTES + ", public, immutable");
 responseHeaders.set("Pragma", "");
 }
}

Addition of the standard header "Transfer-Encoding" is discouraged as a future version of the Restlet API will directly support it.
Addition of the standard header "Date" is not allowed. Please use the equivalent property in the Restlet API.
Addition of the standard header "Last-Modified" is not allowed. Please use the equivalent property in the Restlet API.
Addition of the standard header "Expires" is not allowed. Please use the equivalent property in the Restlet API.
Addition of the standard header "Pragma" is discouraged as a future version of the Restlet API will directly support it.
Addition of the standard header "Cache-control" is not allowed. Please use the equivalent property in the Restlet API.