ASP.NET Core introduces improved support for controlling application behavior across multiple environments, such as development, staging, and production. Environment variables are used to indicate which environment the application is running in, allowing the app to be configured appropriately. It is my hope that if you are an old ASP.NET MVC developer like me, who has been on the fence about checking out Angular, this article has given you some insight as to how things work, and helped to build some confidence in diving in to some Angular development. I am planning on a Part II in the near future.
By Dean Alan Hume
Content Delivery Networks (CDNs) are becoming more and more affordable and freely available to the public. You will find that many of the top performing websites all use domain sharding to provide a faster platform for their static content. If we combine the power of a CDN’s geographical node base with the browser’s ability to download more efficiently from multiple domains, you will find that your website will drastically improve its load times. The ability to serve your users content from a geographical location that is closer to them also means that latency is reduced and this can be a significant step toward improving the speed of your website. This improvement will be observed across all browsers both old and new. This article, based on chapter 9 of Fast ASP.NET Websites, looks at working with a CDN in development. This article covers the use of an ASP.NET MVC HTML helper, but the full chapter will cover examples in MVC.
The goal of a Content Delivery Network (CDN)is to serve content from a server that is located geographically closer to yourusers. It’s a shorter distance to travel, and this means quicker responsetimes. A CDN essentially is a collection of server nodes located around theworld that contain a clone of static files.
The benefits of using a CDN extend far beyond just brilliantresponse times, using a CDN also reduces the amount of bandwidth and requeststhat are served from your website. You will still get all the benefits ofcaching, compression and a wider network for your website. Because your websitewill have static content served from such a wide network, it means that theload will be extremely well balanced across your users around the world. Say,for example, you were about to launch a new product online and expect highvolumes of traffic, this large distributed network of nodes is much betterequipped to handle instantaneous high load.
Suppose you’ve built an app called Surf Store, and you run itagainst the Yahoo! YSlow web performance tool. Imagine that the performancescore for the site currently comes in at 91 out of 100. This is a good score,but, unfortunately, you still score an 'F' for a Content Delivery Network. Ireckon you could do better! Figure 1 shows the result that the Yahoo! YSlowtool produces.
Adding your website components to a CDN is an easy transition.However, depending on your development environment, it may not always be thatadvisable to work directly off a CDN while your website is still underdevelopment. You may have a development team that constantly needs to accessthese files and this can end up adding to your bandwidth bills. I often findthat it is best to work off local copies while in development and, then, switchto the CDN once the website is in production. I am going to show you atechnique in ASP.NET MVC that will allow you to easily work with a CDN whilestill in development.
We can easily add a HTML helper to our sample application thatcontains a switch between our development content and the production content ona CDN. Whether you work in a team or not, it can still be beneficial to usedevelopment content before moving to production content when your site goeslive. The key to using this technique is matching the local file structure tothat of your CDN. This makes it easier to navigate between folders and alsoallows us to easily map to certain files. Let’s run through an example thatmakes use of this technique.
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Begin by adding a key to the Web.config file with the location ofthe CDN. Reverb 32 vst free download.
In listing 1, we simply add the URL of the Content DeliveryNetwork to the appSettingssection of the Web.config file. Next, we are going to use this CDN URL to buildup a path for our content depending on whether we are in release mode or debugmode. Begin by adding a new class file to the solution—I named it CdnUtils.Figure 2 shows the newly created class file in the Solution Explorer of thesample application.
appSettings
Inside this new class, add the code in listing 2.
The code in listing 2 uses the content path that is passed inand simply updates it with the URL of the CDN depending on whether or not thecode is in release mode. If we are still in debug mode, the code will run asnormal and simply return the content path that was passed in. Only if we are inrelease mode will the URL of the CDN get appended to the content path.
Finally, we need to update our views to use the new HTML helpermethod that we wrote. Instead of calling an HTML image tag like so:
We now use:
And this will produce the following HTML when the web page isrendered:
This simple change ensures that, while you are still developinglocally, you aren’t using the bandwidth of your CDN and racking up a heftybill!
Every time you open up a webpage, you are often making a roundtrip to a server halfway around the world to retrieve the components requiredto load the page. These round trips take time and, not surprisingly, thefurther away that you are from the hosting server, the longer it will take youto download the components of a webpage. The ability to improve this delaycomes in the form of a Content Delivery Network. We implemented a technique inthe sample Surf Store application that allowed us to easily switch between thecontent on a CDN and the local content while in development. This techniquewill speed up your website and hopefully save you some money on your CDNbandwidth bills!
Hereare some other Manning titles you might be interested in:
ASP.NET MVC 4 in Action Jeffrey Palermo, Jimmy Bogard, Eric Hexter, Matthew Hinze, and Jeremy Skinner
HTML5 for .NET DevelopersJim Jackson II and Ian Gilman
Dependency Injection in .NETMark Seeman