@Override
    public boolean isContentLengthUnknown() {
        if (contentLengthMayBeUnknown) {
            if (contains(HttpHeaderNames.CONTENT_LENGTH)) {
                return contentLengthMayBeUnknown = false;
            } else {
                return true;
            }
        } else {
            return false;
        }
    }
Adds the specified {@code setCookies} with {@link HttpHeaderNames#SET_COOKIE}.
core/src/main/java/com/linecorp/armeria/common/HttpHeadersBase.java