For example, you could predeploy the content to the CDN as part of your build script. Alternatively, use compile directives or flags to control how the application loads the resources. For example, in debug mode, the application could load static resources from a local folder. In release mode, the application would use the CDN. Consider the options for file compression, such as gzip GNU zip. Compression may be performed on the origin server by the web application hosting or directly on the edge servers by the CDN.
You may need to use different CDN instances at various times. For example, when you deploy a new version of the application you may want to use a new CDN and retain the old CDN holding content in an older format for previous versions. If you use Azure blob storage as the content origin, you can create a separate storage account or a separate container and point the CDN endpoint to it.
Do not use the query string to denote different versions of the application in links to resources on the CDN because, when retrieving content from Azure blob storage, the query string is part of the resource name the blob name. This approach can also affect how the client caches resources. Deploying new versions of static content when you update an application can be a challenge if the previous resources are cached on the CDN.
For more information, see the section on cache control, below. Azure CDN allows you to filter requests based on the country or region of origin and restrict the content delivered.
Consider how to manage caching within the system. For example, in Azure CDN, you can set global caching rules, and then set custom caching for particular origin endpoints. You can also control how caching is performed in a CDN by sending cache-directive headers at the origin. For more information, see How caching works. To prevent objects from being available on the CDN, you can delete them from the origin, remove or delete the CDN endpoint, or in the case of blob storage, make the container or blob private.
However, items are not removed from the CDN until the time-to-live expires. You can also manually purge a CDN endpoint. If you deliver static assets such as font files by using the CDN, you might encounter same-origin policy issues if you use an XMLHttpRequest call to request these resources from a different domain. Many web browsers prevent cross-origin resource sharing CORS unless the web server is configured to set the appropriate response headers. Chances are, if the assigned path is too long, the CDN speed test will reflect results that encompass difficulties the CDN is having in getting data for downloading.
The CDN download test will reveal if the correct path for data pulling is correct, and is appropriate for download requests. Also, as a web speed test, this will show how much it will be easy or hard it will be for end users, like website visitors or remote coworkers. This web speed test helps you reconfigure the correct path of files, so that downloads will happen smoothly. This can be seen in different ways. Certain CDNs may function better with specific processes, like video streaming or image hosting.
Also, the CDN speed test may assist you in transferring certain access to certain file servers. This approach ensures that the entire bandwidth of the internet connection is maxed out, and thereby the maximum data throughput can be measured. Recording the data throughput against measurement time finally yields the available internet speed for downloading data.
Upload speed is tested by reversing the sequence of the download analysis. Again multiple connections are opened to the test server. Instead of downloading a file, a large file of random data is created on your device and pushed through all connections to the server. Pushing the data to the server over the network via multiple streams ensures that the maximum throughput is measured.
Again, recording the data throughput against time yields the available internet speed for uploading data. During the ping test, the device sends a small data package over the network to the test server on the internet. When the server receives this package, it will send it back to the device, completing the roundtrip.
The time it takes the data package to complete the roundtrip is called latency, also known as ping. To achieve an accurate reading, multiple ping tests are conducted consecutively, with the final result being the average of all these tests. All these are automatically handled for you when using Speedcheck. But you should take one crucial aspect into account to test speed accurately.
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