Develop Reference

Change proxy after starting chromedriver in java selenium

Is it possible to use proxy after starting chromedriver on the same browser?
EX:
I start chrome driver
Load website
Put in info
Use proxy
Click submit
I think i found some ways to do it in python and JS but im not sure how to convert it to java

As per Selenium's current implementation once you configure the WebDriver instance with the required Options and Capabilities and initialize the WebDriver session to open a Web Browser, you cannot change the capabilities runtime. Even if you are able to retrieve the runtime capabilities still you won't be able to change them back.
So, in-order to use a proxy you have to initiate a new WebDriver session.
here is #JimEvans clear and concise comment (as of Oct 24 '13 at 13:02) related to proxy settings capability:
When you set a proxy for any given driver, it is set only at the time WebDriver session is created; it cannot be changed at runtime. Even if you get the capabilities of the created session, you won't be able to change it. So the answer is, no, you must start a new session if you want to use different proxy settings.
You can find a relevant discussion in Set capability on already running selenium webdriver

You can use ChromeOptions class.
You can create an instance of ChromeOptions, which has convenient methods for setting ChromeDriver-specific capabilities. You can then pass the ChromeOptions
object into the ChromeDriver constructor:
ChromeOptions options = new ChromeOptions();
options.addExtensions(new File("/path/to/extension.crx"));
ChromeDriver driver = new ChromeDriver(options);
ChromeOptions options = new ChromeOptions();
// Add the WebDriver proxy capability.
Proxy proxy = new Proxy();
proxy.setHttpProxy("myhttpproxy:3337");
options.setCapability("proxy", proxy);
// Add a ChromeDriver-specific capability.
options.addExtensions(new File("/path/to/extension.crx"));
ChromeDriver driver = new ChromeDriver(options);

Selenium browsermob proxy says "Warning: Potential Security Risk Ahead"

I am running my test case using browsermob proxy.I am running my test case in selenium grid.Using Browsermob proxy i am getting ssl error.
When I am running the test on chrome, Chrome shows unsecured massage.
For Firefox, it shows Potential Security Risk Ahead
Here is my code
nodeUrl = Configuration.dockerurl;
DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setBrowserName(Configuration.browsername);
capabilities.setPlatform(Platform.getCurrent());
proxy = getProxyServer(); //getting browsermob proxy
Proxy seleniumProxy = getSeleniumProxy(proxy);
capabilities.setCapability(CapabilityType.PROXY, seleniumProxy);
capabilities.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true);
proxy.setHostNameResolver(ClientUtil.createDnsJavaResolver());
driver = new RemoteWebDriver(new URL(nodeUrl), capabilities);
proxy.setHarCaptureTypes(CaptureType.REQUEST_HEADERS, CaptureType.RESPONSE_HEADERS);
driver.get("https://www.google.com")
//Rest of the code here

You could adjust the profile to completely ignore SSL warnings :)
FirefoxProfile profile=new FirefoxProfile();
profile.setAcceptUntrustedCertificates(true);

How to change useragent-string in runtime chromedriver selenium

I am developing something that want me to change the useragent.
In start I supply user agent as... (to chromedriver)
options.addArguments("--user-agent=Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5376e Safari/8536.25");
But then I want to change it to Windows useragent, or just remove this useragent.
How can I achieve this programatically in Selenium Java.

No, you can't change the useragent of an active Browsing Session once you configure the WebDriver instance through an instance of ChromeOptions and addArguments attribute and start an active Browsing Session.
Even if you are able to extract the Session ID, Cookies, User Agent and other Session Attributes from the active Browsing Session still you won't be able to change/edit those attributes as a HOOK to the WebDriver.
To change the User Agent you have to re-configure the WebDriver instance and initiate a new Browsing Session.

As #Debanjan said You can't change user-agent in runtime, but did You try using ModifyHeader plugin, You can setup it to change user-agent but not at already instantiated driver. You can setup during webDriver instantiation and also try with ChromeOptions.
ChromeOptions options = new ChromeOptions();
options.addExtensions(new File("src/main/resources/idgpnmonknjnojddfkpgkljpfnnfcklj.crx"));
DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability(ChromeOptions.CAPABILITY, options);
or
ChromeOptions chrome = new ChromeOptions();
chrome.addArguments("user-agent=YOUR_USER_AGENT");

PAC file proxy setup using Selenium -Browserstack

I need to set my Browser's proxy with Automatic Proxy configuration URL as shown in the screenshot below.
I am trying to achieve this using Selenium and Browserstack as test environment.
Set the proxy as shown below.
Proxy proxy = new Proxy();
proxy.setProxyAutoconfigUrl("http://pokgsa.ibm.com/gsa/pokgsa/home/j/m/jmit/web/public/proxy.pac");
DesiredCapabilities caps = new DesiredCapabilities();
caps.setCapability(CapabilityType.PROXY, proxy);
caps.setCapability("browser", "Chrome");
caps.setCapability("browser_version", "63.0");
caps.setCapability("os", "Windows");
caps.setCapability("os_version", "7");
caps.setCapability("resolution", "1366x768");
Tried to set the proxy configuration locally and it works however it does not work on browserstack. I think the proxy is not getting set on the virtual browser.

FirefoxProfile profile = new FirefoxProfile();
profile.setPreference("network.proxy.type", 2);
profile.setPreference("network.proxy.autoconfig_url", "http://pokgsa.ibm.com/gsa/pokgsa/home/j/m/jmit/web/public/proxy.pac");
capabilities.setCapability(FirefoxDriver.PROFILE, profile);
You need to pass the pac file details using Firefox profile.
Similarly for chrome, you may refer the following link: https://github.com/SeleniumHQ/docker-selenium/wiki/Corporate-Proxies#setting-a-proxy-for-running-chrome
Also please ensure proxies in the pac file do not need machine based authentication/entries since this may not work as your proxies would be required to be authenticated on all browserstack IPs

Disable system proxy from java

My test script uses Selenium WebDriver with BrowserMob proxy server to simulate slow connection. Starting of the Internet Explorer WebDriver with BrowserMob proxy turns on system proxy. It affects to all connections to the internet (eclipse plugins update, mail corresponding and other apps). Therefore I need to disable system proxy at the end of test script. How to do this from java?
Note: stopping of BrowserMob proxy server doesn't disable system proxy settings.

I found solution in Internet Explorer WebDriver.
There is need to start web driver with IE specific desired capabilities like this:
BrowserMobProxy server = new BrowserMobProxyServer();
server.start();
Proxy proxy = ClientUtil.createSeleniumProxy(server);
DesiredCapabilities capabilities = DesiredCapabilities.internetExplorer();
capabilities.setCapability(InternetExplorerDriver.IE_USE_PRE_PROCESS_PROXY, true);
capabilities.setCapability(CapabilityType.PROXY, proxy);
WebDriver driver = new InternetExplorerDriver(capabilities);
More info here https://github.com/SeleniumHQ/selenium/wiki/DesiredCapabilities