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 https://www.soasta.com/free.
Navigation Timing API provides easy access to accurate page timing information, but it is still insufficient to draw a complete picture. Whether we need to support browsers that do not currently implement the Navigation Timing or get information about resources not included in the current page, be sure to find out more about the user’s network bandwidth or whether their support for IPv6 is better or worse than their support for IPv4. All of the techniques presented here were developed while writing Boomerang though not all of them made it into the code yet.
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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.
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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.
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Web application developers today need to be skilled in a multitude of disciplines. It’s necessary to build an application that is user friendly, highly performant, accessible and secure, all while executing partially in an untrusted environment that you, the developer, have no control over. I speak, of course, about the User Agent. Most commonly seen in the form of a web browser, but in reality, one never really knows what’s on the other end of the HTTP connection.
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