final void setCookie(Iterable<? extends Cookie> setCookie) {
        //noinspection unchecked
        addCookies((Iterable<Cookie>) setCookie, HttpHeaderNames.SET_COOKIE, Cookie::toSetCookieHeaders);
    }
Adds the specified {@code setCookies} with {@link HttpHeaderNames#SET_COOKIE}.
core/src/main/java/com/linecorp/armeria/common/HttpHeadersBase.java