@Test public void requestHeaderAndCookie() { this.builder.build().get().uri("/path").accept(MediaType.APPLICATION_JSON) .cookies(cookies -> cookies.add("id", "123")) // SPR-16178 .exchange(); ClientRequest request = verifyAndGetRequest(); assertEquals("application/json", request.headers().getFirst("Accept")); assertEquals("123", request.cookies().getFirst("id")); verifyNoMoreInteractions(this.exchangeFunction); }