- #Postman download file content type how to#
- #Postman download file content type full#
- #Postman download file content type code#
#Postman download file content type how to#
Postman offers many features, though in this article, we will talk about how to test your API.
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#Postman download file content type code#
Postman test to check status code is not 404.Postman test to check whether status is 200 or 201.Postman test to check whether status is 200 OK.This article will use Postman & Javascript for API testing. API testing is the process of verifying that your Application Programming Interface (API) is working correctly. Postman helps you build APIs by providing tools to capture, validate, and test requests and responses. To sum up, the File method in line 7 sets the HTTP response headers as follows.Postman is a tool to help you develop APIs. 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.
#Postman download file content type full#
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.