/** @return return a clone HttpHeader from default HttpHeader */
 private HttpHeaders cloneHttpHeaders() {
   HttpHeaders httpHeaders = getHttpHeaders();
   HttpHeaders clone = new HttpHeaders();
   for (String entry : httpHeaders.keySet()) {
     clone.put(entry, httpHeaders.get(entry));
   }
   return clone;
 }
 /**
  * Карта HTTP заголовков
  *
  * @return Карта HTTP заголовков
  */
 public HttpHeaders getHeader() {
   if (header == null) {
     header = new HttpHeaders();
     for (String key : getHeaderFields().keySet()) {
       String value = null;
       if (key == null) {
         continue;
       }
       for (String v : getHeaderFields().get(key)) {
         value = v;
       }
       if (value == null) {
         continue;
       }
       header.put(key, value);
     }
   }
   return header;
 }