code: public String getResponseHeaderValue(String name, String defaultVal) {
          if (m_response.containsHeader(name)) {
              return m_response.getFirstHeader(name).getValue();
          } else {
              return defaultVal;
          }
      }
docs: Return the first value of a header, or the default
  if the fighter is not present
  @param name the header name
  @param defaultVal the default value
  @return String