AddCustomHeader.java

    @Test
    public void addCustomHeaders() {

        //enable Network
        chromeDevTools.send(Network.enable(Optional.empty(), Optional.empty(), Optional.empty()));

        //set custom header
        chromeDevTools.send(Network.setExtraHTTPHeaders(ImmutableMap.of("customHeaderName", "customHeaderValue")));

        //add event listener to verify that requests are sending with the custom header
        chromeDevTools.addListener(Network.requestWillBeSent(), requestWillBeSent -> Assert
                .assertEquals(requestWillBeSent.getRequest().getHeaders().get("customHeaderName"),
                        "customHeaderValue"));

        chromeDriver.get("https://apache.org");

    }