@Test
    void testOptions() throws Exception {
        testSimple("OPTIONS * HTTP/1.1", "HTTP/1.1 200 OK",
                   "allow: OPTIONS,GET,HEAD,POST,PUT,PATCH,DELETE,TRACE,CONNECT");
    }
Ensure that the connection is not broken even if {@link Service#serve(ServiceRequestContext, Request)}
raises an exception.
core/src/test/java/com/linecorp/armeria/server/ServerTest.java