@ParameterizedTest
    @ArgumentsSource(ClientAndProtocolProvider.class)
    void testTrailers(WebClient client) throws Exception {
        final CompletableFuture<AggregatedHttpResponse> f = client.get("/trailers").aggregate();

        final AggregatedHttpResponse res = f.get();
        assertThat(res.trailers().get(HttpHeaderNames.of("foo"))).isEqualTo("bar");
    }
Similar to {@link #testTimeoutAfterPartialContent(WebClient)}, but tests the case where the service
produces a pooled buffers.
core/src/test/java/com/linecorp/armeria/server/HttpServerTest.java