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Devwebsbn cloudapp net download file6/2/2023 Records associate a specific name, such as, with either an IP address or another DNS name. For example, it is much easier to remember a DNS name like than it is to remember an IP address such as 192.168.1.88 or 2001:0:4137:1f67:24a2:3888:9cce:fea3. The IP address is sort of like a street address, but it's not very human friendly. For example, when you enter a web site address in your browser, or click a link on a web page, it uses DNS to translate the domain into an IP address. The Domain Name System (DNS) is used to locate resources on the internet. Understanding DNS records About DNS records To learn how the association works for a custom domain name from a specific domain registrar, select your domain registrar to proceed. Here is a video that shows generally how to hook up a custom CNAME DNS Record to an Azure web app and how long it takes for DNS to propagate. See App Service Pricing Details for more information. You must configure your Azure App Service plan to use Shared, Basic, Standard, or Premium, which may change how much you are billed for your subscription. Note Custom domain names cannot be used with Free Azure web apps. When you create a web app, Microsoft Azure provides a friendly subdomain on the domain so your users can access your Azure web app using a URL like You can also associate a custom domain name purchased from your domain registrar, such as, with your Azure web app in order to provide a more recognizable domain name for your users. If you have questions about any of these areas, click the "Go to the Prerequisite knowledge page" option at the end of the page. It also assumes that if you are using Azure web apps, you have a basic understanding of Azure App Service plan (Free, Shared, Basic, Standard and Premium). To sum up, the File method in line 7 sets the HTTP response headers as follows.This guide assumes that you have background knowledge of DNS records. Browsers treat this value as the top priority to dictate the filename when downloading the file. In the File method, the third parameter fileDownloadName determines the value for the filename attribute in the content-disposition HTTP response header. You can set the value for contentType according to your file type. In this demo, the action method returns a text file, so the content type is “ text/plain”. In the File method (line 7), the second parameter contentType is used in the HTTP header to indicate the format of contents transmitted over the internet. And you can choose to stream the file too. Note that we should validate the request and user permissions before finding or generating the requested file. In the end (line 7), we return a FileContentResult object that is created using the method File(byte fileContents, string contentType, string fileDownloadName). In the code above, we first find or generate the requested file from the local file system or a file storage, then read the file content. With the groundwork laid, we can easily write an action method as follows: The File method is very flexible and has a variety of overload methods to instantiate FileContentResult, FileStreamResult, VirtualFileResult, and PhysicalFileResult instances. In other words, no matter which of the four types you use, the client-side will not notice any difference when downloading a file from the API endpoint.Īpart from the constructors for the four concrete types, we can use a method File, provided natively from the ControllerBase class, to return a concrete FileResult object. These four variants don’t differ much, you can use any of them to construct a FileResult object at your convenience. The FileResult type is an abstract type, and it has four concrete implementations: FileContentResult, FileStreamResult, VirtualFileResult, and PhysicalFileResult. But most times we still want to use the generic ActionResult because it covers many other useful return types, such as BadRequest, NoContent, and so on. ![]() When we want to return a file response, we can explicitly set the return type for the action method to be FileResult, which is a type inherited from ActionResult. In ASP.NET Core, a Web API action method usually returns an ActionResult object. The full solution can be found in my GitHub repository, which includes a web project for uploading/downloading files and an integration test project for testing controller methods. In the final HTML page, end users can left-click a hyperlink to download the file or right-click the link to choose “ Save Link As” in the context menu and save the file. ![]() In this article, I will use a demo Web API application in ASP.NET Core to show you how to transmit files through an API endpoint.
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