docs: private void putAllCookiesInASingleHeader(String host, CookieSpec matcher,
              Cookie[] cookies) {
      	
      	LOG.trace("enter putAllCookiesInASingleHeader(String host, CookieSpec matcher, Cookie[] cookies)" );
      	
          //use a map to make sure we only have one cookie per name
          HashMap<String, Cookie> mergedCookies = new HashMap<String, Cookie>();
          Header[] cookieLineHeaders = getRequestHeaderGroup().getHeaders(HttpHeader.COOKIE);
          for (Header cookieLineHeader : cookieLineHeaders) {
              List<Cookie> cookiesHeader = parseCookieHeader(host, cookieLineHeader.getValue());
              for (Cookie cookieHeader: cookiesHeader){
                  mergedCookies.put(cookieHeader.getName(),cookieHeader);
              }
              // clean the header
              getRequestHeaderGroup().removeHeader(cookieLineHeader);
          }
          //add the cookies coming from the state 
          for (Cookie cookie : cookies) {
              mergedCookies.put(cookie.getName(),cookie);
          }
          cookies = mergedCookies.values().toArray(new Cookie[mergedCookies.size()]);
          String s = matcher.formatCookies(cookies);
          getRequestHeaderGroup()
                  .addHeader(new Header(HttpHeader.COOKIE, s, true));
      }