我是 selenium 和 webdriver 的新手，经过我得到以下代码来设置代理并启动浏览器：
String PROXY = "<<MY proxy>>";
org.openqa.selenium.Proxy proxy = new org.openqa.selenium.Proxy();
proxy.setHttpProxy(PROXY);
DesiredCapabilities cap = new DesiredCapabilities();
cap.setCapability(CapabilityType.PROXY, proxy);
WebDriver driver = new InternetExplorerDriver(cap);
driver.get("http://www.google.com");
driver.quit();
遇到以下问题：
1）得到下面附加的错误
2）我可以从 IE 代理设置中看到我提供的代理字符串存在于“proxy.pac”文件中，但代理不起作用。即使我停止脚本并手动执行
3）当我将代理字符串直接放在浏览器中时，它在我提供凭据后工作正常。我应该提供凭据吗？你能指导一下如何做吗？
Sep 5, 2012 3:59:52 PM org.openqa.selenium.browserlaunchers.WindowsProxyManager backupRegistrySettings
INFO: Backing up registry settings...
Sep 5, 2012 3:59:53 PM org.openqa.selenium.browserlaunchers.WindowsProxyManager changeRegistrySettings
INFO: Modifying registry settings...
The path to the driver executable must be set by the webdriver.ie.driver system property; for more information, see http://code.google.com/p/selenium/wiki/InternetExplorerDriver. The latest version can be downloaded from http://code.google.com/p/selenium/downloads/list
Sep 5, 2012 3:59:54 PM org.openqa.selenium.ie.InternetExplorerDriverServer initializeLib
WARNING: This method of starting the IE driver is deprecated and will be removed in selenium 2.26. Please download the IEDriverServer.exe from http://code.google.com/p/selenium/downloads/list and ensure that it is in your PATH.
Sep 5, 2012 3:59:58 PM org.apache.http.impl.client.DefaultRequestDirector tryExecute
INFO: I/O exception (org.apache.http.NoHttpResponseException) caught when processing request: The target server failed to respond
Sep 5, 2012 3:59:58 PM org.apache.http.impl.client.DefaultRequestDirector tryExecute
INFO: Retrying request
Picked up JAVA_TOOL_OPTIONS: -agentlib:jvmhook
Picked up _JAVA_OPTIONS: -Xrunjvmhook -Xbootclasspath/a:D:\bin\java_shared\classes;D:\bin\java_shared\classes\jasmine.jar