A cookie has the optional attributesExpires andMax-Age. If both are set, the latter takes precedence.

In methodadaptCookies() of classorg.springframework.http.client.reactive.HttpComponentsClientHttpResponse each HttpComponentsCookie is converted to a SpringResponseCookie.

Given is an HttpComponentsCookie which has setExpires only, sinceadaptCookies() just readsMax-Age fromCookie, the resultingResponseCookie has lost its expiration information.

Note: I have also checkedReactorClientHttpResponse, and it is not affected. Netty internally convertsExpires toMax-Age. Thus, itsCookie class supportsMax-Age only.