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POwhen to host using a CDN and when not to?
 

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  1. POwhen to host using a CDN and when not to?
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    <p>This question tries to find whether its worth to trade-off the benefits of a CDN in favor of a more structured and organized vendor code management.</p> <hr> <p>I know that using a CDN to deliver vendor libs like jquery is recommended. </p> <p>Yet, I was reading about <a href="http://twitter.github.com/bower/" rel="noreferrer">bower</a> today and It made me wonder. With bower I can easily manage all of the dependencies of my application in a very structured way. I can eventually pack them up in a single <code>vendor.js</code> file (using yeoman, <a href="http://brunch.io" rel="noreferrer">brunch</a> or simple <a href="http://gruntjs.com/" rel="noreferrer">grunt</a>) that will be server in the html in a <code>script</code> tag.</p> <p>However, while this approach can make my life easier, what are its cons? I can think of the following:</p> <ul> <li>There is high chance that many of the libs i'm using, are already cached in the user's browser. </li> <li>By putting it all in a single <code>vendor.js</code> file, the browser will eventually cache this file, but I will start facing problems whenever I add new third-party depencies, ie when my vendor file is changed. The browser will have to reload that file (thus loosing the caching of the original vendor.sj file)</li> </ul> <p>Putting it this way, paying the time to manage dependencies in the html as <code>&lt;script&gt;</code> tags, seams to offer a better performance/load time.</p> <p>Do you think there is something wrong in my way of thinking? Is the benefit of organizing code with say <code>bower</code>, convincing enough? After all, its like for backbone. Yes a backbone app is heavier for small applications, it contains more code.. but from a dev point of view, its worth it!</p> <p>Cheers (and thanks for the comments that made me re-edit the question!)</p>
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    1. COThat's because other qualified people obviously do not believe it's _"the way to go"_. This type of question is usually not allowed since it will invoke strong opinions. Also, despite it being "not constructive", it's [been addressed here many times before](http://stackoverflow.com/search?q=CDN+good+idea&submit=search).
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    2. COLook in jQuery tag FAQ in this site... one of the top ranking posts covers this topic in great detail http://stackoverflow.com/questions/1014203/best-way-to-use-googles-hosted-jquery-but-fall-back-to-my-hosted-library-on-go. Simple answer for your question is CDN resources much more likely to already be in user cache
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    3. COThis question could be rephrased to be constructive if you were ask what the specific technical differences are, so that you can make your own judgement call, rather than asking for others to give your theirs.
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