Application Security Testing: An Integral Part of DevOps
ASP.NET has helped us produce rapid rich web applications for close to a decade now. ASP.Net web forms, as the webpages are officially known, can become cumbersome to handle when they grow richer. The first line of defense, in such cases, is offered by the Browser Debugging Tools. Read on to find out more about such tools and how they help.
I believe Firebug - the first in the race - created this phenomenal evolution of Browser Debugging Tools. Firebug is the most famous extension that runs on the Firefox web browser. It resides on Firefox, who probably owes most of its success to this cute extension. Modern day browsers, like IE (8 and above) and Chrome now have developer tools as the default standard.
Let's look at the features that are available for the common browsers today with respect to the tools that help you debug scripts, css and play with html.
- The new Console extension
- Firebug - an extension
- Webdeveloper - an extension
- Internet Explorer Developer Tools - a comprehensive suite
Chrome impresses on the go, due to its speed and its quick availability to the user. To see the features, just follow the instructions below:
- Open any webpage in Chrome.
- Right-click on any element that you want to know about - and choose "Inspect Element" on the menu. I chose to right-click on the magnifying glass icon next to each result and then chose to inspect the element. It opens the DOM Inspector for you with the element selected. You can view the styles used on the element instantly with the CSS style description to the right.
- On the far right in the new window that appeared is the Console button. Click
on the button and type a letter to be presented with the world's most
and also execute other useful commands.
Resources usage lets you see the resource usage compared with time and size. This section provides us rich tooltips with good information to help us understand the render process.
Figure 3: Chrome Resources Usage
Run the audits on the page, and you will be presented with a set of
optimization techniques for sure.
Figure 4: Chrome Audits
Figure 1: Open a webpage in Chrome
Figure 2: The Chrome "Inspect Element" Menu
IE joined the race with the release of a tool suite called Internet Explorer Developer Tools. This is a great tool in terms of the following impressive and unique features:
- It allows you to profile the script code faster.
- It allows you to test your web page in different document modes and different browser modes.
- Extensive support to control cache, and browser objects like cookies.
Hit F12 when you have opened your ASP.NET web page to open the developer tools. There are a bunch of features that can save you some time.
you are working on a webpage that you haven't created, then this tip will be
helpful to you. Hit F12 to open the Developer Tools. Select the HTML element in
the HTML tab. To your right, select
"Layout". This will help you understand the placement of HTML elements on the
Figure 5: Chrome Developer Tools: HTML Element
- Look at the options in the Cache Menu. It helps you debug issues with
"Browser Cache" and "Cookies".
Figure 6: Debugging Browser Cache and Cookies
- Script Debugging: You can debug your script and fix many of the script errors with ease. Look at the Script tab to see the scripts loaded for the page. Select a script, and place breakpoints as your normal server code.
A comprehensive explanation of Internet Explorer's Developer tools can be found at the MSDN site (linked above).
Most of our ASP.Net web applications also follow rich CSS and scripts to produce an interactive and flashy page to clients. The features highlighted above can be found in all major browser development tools.