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What is computer?
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A computer is an electronic device that processes data using instructions stored in its memory, enabling it to perform various tasks, calculations, and functions.
In ASP.NET Core Web APIs, authentication filters provide a powerful mechanism to secure your API endpoints. Here's a breakdown specifically for .NET Core: How it Works: Pipeline Integration: When a request hits your Web API, it goes through a series of processing stages called the pipeline. Authentication filters are registered within this pipeline. Filter Activation: Depending on the scope (global, controller, or action), specific filters are triggered for each request. Credential Validation: The filter inspects the request for credentials based on the configured authentication scheme. This could involve: Headers: Examining specific headers for API keys or tokens. Body: Checking for username and password combinations in the request body (common for basic authentication). Other Mechanisms: Depending on the scheme, credentials might be retrieved from cookies or URL parameters. IPrincipal Creation: If credentials are valid according to the filter's logic,...
In ASP.NET Core, middleware refers to components that are added to the application pipeline to handle requests and responses. These components can perform various tasks such as authentication, logging, routing, and error handling. Middleware sits between the client and the server, intercepting and processing HTTP requests and responses as they flow through the pipeline. Each middleware component in the pipeline can inspect and optionally modify the request or response before passing it on to the next component in the pipeline. This modular approach allows developers to compose complex web applications by adding and arranging middleware components as needed. Here's a simple example of middleware in ASP.NET Core: ```csharp code using Microsoft.AspNetCore.Builder; using Microsoft.AspNetCore.Http; using System.Threading.Tasks; public class Startup { public void Configure(IApplicationBuilder app) { app.Use(async (context, ne...
Custom filters in ASP.NET Core Web APIs offer a powerful way to implement specific authentication logic beyond what built-in filters provide. Here's a breakdown of how to create and use them: Creating Custom Authentication Filters: 1. Inheritance: Your custom filter class typically inherits from AuthorizeAttribute or the IAuthorizationFilter interface. AuthorizeAttribute: This is a simpler approach if your filter primarily relies on properties from the base class (like Roles or AuthenticationSchemes). IAuthorizationFilter: This interface offers more control over the authorization process. You'll need to implement the OnAuthorization method to perform custom validation logic. 2. Custom Validation Logic: Within the OnAuthorization method (for IAuthorizationFilter ) or using properties like Roles and AuthenticationSchemes (for AuthorizeAttribute ), implement your authentication logic. This logic might involve: ...
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