@Test
    void testUnsupportedMethod() throws Exception {
        testSimple("WHOA / HTTP/1.1", "HTTP/1.1 405 Method Not Allowed");
    }
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