HTTP response codes

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For some browser configurations in Selenium RC, Selenium acted as a proxy between the browser and the site being automated. This meant that all browser traffic passed through Selenium could be captured or manipulated. The captureNetworkTraffic() method purported to capture all of the network traffic between the browser and the site being automated, including HTTP response codes.

Selenium WebDriver is a completely different approach to browser automation, preferring to act more like a user. This is represented in the way you write tests with WebDriver. In automated functional testing, checking the status code is not a particularly important detail of a test’s failure; the steps that preceded it are more important.

The browser will always represent the HTTP status code, imagine for example a 404 or a 500 error page. A simple way to “fail fast” when you encounter one of these error pages is to check the page title or content of a reliable point (e.g. the <h1> tag) after every page load. If you are using the page object model, you can include this check in your class constructor or similar point where the page load is expected. Occasionally, the HTTP code may even be represented in the browser’s error page and you could use WebDriver to read this and improve your debugging output.

Checking the webpage itself is in line with WebDriver’s ideal practice of representing and asserting upon the user’s view of the website.

If you insist, an advanced solution to capturing HTTP status codes is to replicate the behaviour of Selenium RC by using a proxy. WebDriver API provides the ability to set a proxy for the browser, and there are a number of proxies that will programmatically allow you to manipulate the contents of requests sent to and received from the web server. Using a proxy lets you decide how you want to respond to redirection response codes. Additionally, not every browser makes the response codes available to WebDriver, so opting to use a proxy allows you to have a solution that works for every browser.