@Override
    @Nullable
    public ContentDisposition contentDisposition() {
        final String contentDispositionString = get(HttpHeaderNames.CONTENT_DISPOSITION);
        if (contentDispositionString == null) {
            return null;
        }

        try {
            return ContentDisposition.parse(contentDispositionString);
        } catch (IllegalArgumentException ex) {
            return null;
        }
    }
Adds the specified {@code setCookies} with {@link HttpHeaderNames#SET_COOKIE}.
core/src/main/java/com/linecorp/armeria/common/HttpHeadersBase.java