RemoteWebDriver - Capture Screenshot

Capture Screenshot - RemoteWebDriver

Java Snippet - 

import java.io.File;
import java.net.URL;

import org.openqa.selenium.OutputType;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.Augmenter;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.remote.RemoteWebDriver;

public class Testing {
    
    public void myTest() throws Exception {
        WebDriver driver = new RemoteWebDriver(
                                new URL("http://localhost:4444/wd/hub"), 
                                DesiredCapabilities.firefox());
        
        driver.get("http://www.google.com");
        
        // RemoteWebDriver does not implement the TakesScreenshot class
        // if the driver does have the Capabilities to take a screenshot
        // then Augmenter will add the TakesScreenshot methods to the instance
        WebDriver augmentedDriver = new Augmenter().augment(driver);
        File screenshot = ((TakesScreenshot)augmentedDriver).
                            getScreenshotAs(OutputType.FILE);
    }
}

Python Snippet -

from selenium import webdriver

driver = webdriver.Remote("http://localhost:4444/wd/hub", webdriver.DesiredCapabilities.FIREFOX.copy())
driver.get("http://www.google.com")
driver.get_screenshot_as_file('/Screenshots/google.png')

Selenium - How to configure GeckoDriver with proxy using Gecko Driver Service

  GeckoDriver - passing proxy and use of Gecko Driver Service

Firefox maintains its proxy configuration in a profile. One can set it on profile that is created on the fly as is shown in the following example. 
With GeckoDriver the proxy has to be passed through the required capabilities as described below 

String PROXY = "localhost";
int PORT = 8080;

com.google.gson.JsonObject json = new com.google.gson.JsonObject();
json.addProperty("proxyType", "MANUAL");
json.addProperty("httpProxy", PROXY);
json.addProperty("httpProxyPort", PORT);
json.addProperty("sslProxy", PROXY);
json.addProperty("sslProxyPort", PORT);

DesiredCapabilities cap = new DesiredCapabilities();
cap.setCapability("proxy", json);

GeckoDriverService service =new GeckoDriverService.Builder(firefoxBinary)
  .usingDriverExecutable(new File("path to geckodriver"))
  .usingAnyFreePort()
  .usingAnyFreePort()
  .build();
service.start();

// GeckoDriver needs the Proxy set in RequiredCapabilities
driver = new FirefoxDriver(service, cap, cap);