@Test
    void caseInsensitiveOriginCheck() {
        final WebClient client = client();
        final AggregatedHttpResponse res = preflightRequest(client, "/cors", "http://EXAMPLE.com", "GET");
        assertThat(res.headers().get(HttpHeaderNames.ACCESS_CONTROL_ALLOW_ORIGIN))
                .isEqualTo("http://EXAMPLE.com");
    }
If no CORS was configured and there's no binding for OPTIONS method, the server's fallback service will
be matched and the service with partial binding must not be invoked.
core/src/test/java/com/linecorp/armeria/server/cors/HttpServerCorsTest.java