HttpListener

HttpListener is a class in the .NET Framework used to create a simple, programmable web server capable of handling HTTP requests directly within an application. Introduced in the System.Net namespace, HttpListener provides a straightforward interface for building HTTP servers without the need for a full-fledged web server like IIS.

HttpListener listens for HTTP requests on specified URI prefixes, which can include URLs with schemes such as http and https. Developers can configure one or more prefixes to define which incoming requests the listener should process. Once started, HttpListener runs asynchronously or synchronously, accepting incoming client requests and allowing the application to process them accordingly.

Key features of HttpListener include support for authentication, request filtering, and handling of various HTTP methods such as GET, POST, PUT, and DELETE. It also provides access to request details, including headers, query strings, and request bodies, as well as mechanisms to send responses back to clients.

Because it resides within the same process as the application, HttpListener is suitable for lightweight server tasks, local testing, or embedded server functionality within applications. However, it has limitations regarding scalability and security compared to dedicated web servers, making it more appropriate for small-scale or development environments.

HttpListener is available in the .NET Framework and .NET Core, but with some differences in features and platform support. Its simplicity and ease of use have made it popular for quick server prototyping, testing, or developing custom HTTP services within .NET applications.