Philip Tellis Philip Tellis is a geek, speedfreak and Chief RUM Distiller at SOASTA where he works on the mPulse product. mPulse helps site owners measure the real user perceived performance of their sites and help visualize correlations between performance and business metrics like conversions, sales, lolcats and more. You can use mPulse for free at http://www.soasta.com/free.
In Part 1 of this series, we had a look at how the underlying protocols of the Web work, and how we can use JavaScript to estimate their performance characteristics. In this second part, we’ll look at DNS, IPv6 and the new W3C specification for the NavigationTiming API.
Every device attached to the Internet is identified by a numeric address known as an IP address. The two forms of IP... Read More
As Web developers, we have an affinity for developing with JavaScript. Whatever the language used in the back end, JavaScript and the browser are the primary language-platform combination available at the user’s end. It has many uses, ranging from silly to experience-enhancing.
In this article, we’ll look at some methods of manipulating JavaScript to determine various network... Read More
In my last article, I spoke about several common mistakes that show up in web applications. Of these, the one that causes the most trouble is insufficient input validation/sanitization. In this article, I'm joined by my colleague Peter (evilops) Ellehauge in looking at input filtering in more depth while picking on a few real examples that we've seen around the web. As you'll see from the... Read More
