@Test
    public void echoPostWithEmptyBody() throws Exception {
        final AggregatedHttpResponse response = server().blockingWebClient().post(
                "/jsp/echo_post.jsp", HttpData.empty());
        assertThat(response.status()).isSameAs(HttpStatus.OK);
        assertThat(String.valueOf(response.contentType())).startsWith("text/html");
        final String actualContent = CR_OR_LF.matcher(response.contentUtf8())
                                             .replaceAll("");
        assertThat(actualContent).isEqualTo(
                "<html><body>" +
                "<p>Check request body</p>" +
                "<p></p>" +
                "</body></html>");
    }
Returns the {@link ServerExtension} that provides the {@link Server} that serves the {@link Service}s
this test runs against.
testing-internal/src/main/java/com/linecorp/armeria/internal/testing/webapp/WebAppContainerTest.java