@Test
    void requireThatHeaderWithEmptyValueIsAllowed() throws Exception {
        final JettyTestDriver driver = JettyTestDriver.newInstance(new EchoWithHeaderRequestHandler("X-Foo", ""));
        driver.client().get("/status.html")
                .expectStatusCode(is(OK))
                .expectHeader("X-Foo", is(""));
        assertTrue(driver.close());
    }
@author Oyvind Bakksjo
@author Simon Thoresen Hult
@author bjorncs
container-core/src/test/java/com/yahoo/jdisc/http/server/jetty/HttpServerTest.java