How can I use Selenium RC to verify our Server-Side-Redirects (301, 302)?
Selenium-RC has a traffic capture mode, defined as selenium.start("captureNetworkTraffic=true"); that will enable you to capture HTTP responses, including redirects and error codes.
Here is an excellent resource on how to capture and process/format this information once retrieved. It uses Python, though, but should give you a start.
For checking the URL of browser, you could use selenium.getLocation();
in python's implementation,
driver = webdriver.Firefox()print driver.current_url