March 2013
Intermediate to advanced
774 pages
20h 36m
English
Content preview from Programming the Mobile Web, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 18. Debugging and Performance
Debugging and performance optimization are the two scariest activities in the mobile web development world, after testing—but don’t worry, there are lots of ways to tame them. We discussed tools and techniques for testing in Chapter 4. In this chapter we will focus on more advanced features for debugging and performance.
Debugging
For years I’ve complained that web developers were second-class citizens (compared with native developers), in terms of the availability of tools and documentation. Fortunately, in the last year or so vendors have begun to realize that web developers need more tools for debugging and performance measurement, and the tools catalog available today is growing.
Server-Side Debugging
To debug server-side detection, adaptation, or content delivery scripts, we can use some HTTP tools before turning to the real devices.
User agent spoofing
User agent spoofing tools allow us to fool the server about the browser that is currently requesting the web page by changing how the client identifies itself to the server. For example, using a desktop browser, we can say it is a mobile browser and the server will fall into the trap. We can use these tools to debug mobile redirects and detection frameworks, as covered in Chapter 9, without the need of real devices or even emulators.
We can then browse to any website and see how the server manages the user agent and which content it serves. (Remember to go back to the default user agent after finishing ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.