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Using a http proxy server

There is a special WebClient constructor that allows you to specify proxy server information in those cases where you need to connect through one. 

@Test
public void homePage_proxy() throws Exception {
    try (final WebClient webClient = new WebClient(BrowserVersion.FIREFOX, PROXY_HOST, PROXY_PORT)) {

        //set proxy username and password 
        final DefaultCredentialsProvider credentialsProvider = (DefaultCredentialsProvider) webClient.getCredentialsProvider();
        credentialsProvider.addCredentials("username", "password");

        final HtmlPage page = webClient.getPage("http://htmlunit.sourceforge.net");
        Assert.assertEquals("HtmlUnit - Welcome to HtmlUnit", page.getTitleText());
    }
}

In case the proxy server requires credentials you can define them on the DefaultCredentialsProvider from the webClient 

@Test
public void homePage_proxy() throws Exception {
    try (final WebClient webClient = new WebClient(BrowserVersion.FIREFOX, PROXY_HOST, PROXY_PORT)) {

        //set proxy username and password 
        final DefaultCredentialsProvider credentialsProvider = (DefaultCredentialsProvider) webClient.getCredentialsProvider();
        credentialsProvider.addCredentials("username", "password", PROXY_HOST, PROXY_PORT);

        final HtmlPage page = webClient.getPage("http://htmlunit.sourceforge.net");
        Assert.assertEquals("HtmlUnit - Welcome to HtmlUnit", page.getTitleText());
    }
}

Socks proxy sample

The setup of socks proxies is a bit more tricky but in general follows the same pattern. 

@Test
public void homePage_proxy() throws Exception {
    try (final WebClient webClient = new WebClient(BrowserVersion.FIREFOX) {
        // socks proxy / the true as last parameter marks this as socks proxy
        webClient.getOptions().setProxyConfig(new ProxyConfig(SOCKS_PROXY_HOST, SOCKS_PROXY_PORT, null, true));

        //set proxy username and password if required
        final DefaultCredentialsProvider credentialsProvider = (DefaultCredentialsProvider) webClient.getCredentialsProvider();
        credentialsProvider.addSocksCredentials("username", "password", SOCKS_PROXY_HOST, SOCKS_PROXY_PORT);

        final HtmlPage page = webClient.getPage("http://htmlunit.sourceforge.net");
        Assert.assertEquals("HtmlUnit - Welcome to HtmlUnit", page.getTitleText());
    }
}