![]() ![]() As of Java 11, the API is now fully asynchronous (the previous HTTP/1.1 implementation was blocking).This is achieved by introducing a number of changes such as stream multiplexing, header compression and push promises. The newer version of the HTTP protocol is designed to improve the overall performance of sending requests by a client and receiving responses from the server.The incubated HTTP API from Java 9 is now officially incorporated into the Java SE API. ![]() If you use IHttpClientFactory to create your HttpClient instances, then the pooling and lifetime of the underlying HttpClientMessagehandler instances are managed for you automatically. IHttpClientFactory is an opinionated factory that has been available since. The overloaded Create methods of the HttpClientFactory class look like this: public static HttpClient Create(params DelegatingHandler handlers) This class has the following methods:Ĭreate(DelegatingHandler) Create(HttpMessageHandler, DelegatingHandler) CreatePipeline(HttpMessageHandler, IEnumerable) Note that HttpClientFactory (discussed in my earlier article) is just a helper to create HttpClient instances configured with the handlers provided. IHttpClientFactory was introduced to provide ASP.NET Core with excellent built-in support for creating, caching, and disposing of HttpClient instances. The DefaultHttpClientFactory implements the IHttpClientFactory and IHttpMessageHandlerFactory interfaces. IHttpClientFactory is an interface that is implemented by the DefaultHttpClientFactory class, which is an opinionated factory. But a better alternative is to use IHttpClientFactory to retrieve an instance of HttpClient and then use the instance for calling action methods. What should you do instead? One option is to make the HttpClient instance static or wrap a non-static instance of the HttpClient inside a custom class and make it a singleton class. Although you can call the Dispose method on an HttpClient instance, it is not a recommended practice. Nevertheless, when working with HttpClient instances, you shouldn’t be disposing of them. HttpClient challengesĪlthough the HttpClient class doesn’t implement the IDisposable interface directly, it extends the class, which does implement IDisposable. We’ll use this project in the sections that follow. ![]() In the new project, create a new API controller and save it using the default name, i.e., ValuesController. Ensure that Authentication is set to “No Authentication” as we won’t be using authentication either.įollowing these steps should create a new ASP.NET Core MVC project in Visual Studio 2019.Ensure that the check boxes “Enable Docker Support” and “Configure for HTTPS” are unchecked as we won’t be using those features here.Select “Web Application (Model-View-Controller)” as the project template to create a new ASP.NET Core MVC application.NET Core as the runtime and ASP.NET Core 3.1 (or later) from the drop-down list at the top. In the “Create a New ASP.NET Core Web Application” window shown next, select.Optionally check the “Place solution and project in the same directory” check box, depending on your preferences.In the “Configure your new project” window, specify the name and location for the new project.In the “Create new project” window, select “ASP.NET Core Web Application” from the list of templates displayed.Assuming Visual Studio 2019 is installed in your system, follow the steps outlined below to create a new ASP.NET Core project in Visual Studio. If you don’t already have a copy, you can download Visual Studio 2019 here.Ĭreate an ASP.NET Core MVC project in Visual Studio 2019įirst off, let’s create an ASP.NET Core project in Visual Studio 2019. This article further discusses HttpClient and IHttpClientFactory with code examples to illustrate the concepts covered. To work with the code examples provided, you should have Visual Studio 2019 installed in your system. I’ve discussed HttpClient and HttpClientFactory in an earlier article here. NET Core 2.1, IHttpClientFactory provides a central place to name, configure, and create HttpClient instances and manages the pooling and lifetimes of the instances automatically. You can avoid these downsides by using IHttpClientFactory to create your HttpClient instances. However, there are certain downsides to using HttpClient directly, mainly having to do with managing the lifetimes of the instances manually. To achieve this, you would typically instantiate HttpClient and use the instance to invoke your action methods. When working in applications in ASP.NET Core you might often need to invoke the Web API action methods using HttpClient to check if the endpoints are working fine. ![]()
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