Filter types
Authorization filters
run first and are used to determine whether the user is authorized for the request. Authorization filters short-circuit the pipeline if the request is not authorized. Resource filters: Run after authorization.
Web API uses authorization filters
to implement authorization
. The Authorization filters run before the controller action. If the request is not authorized, the filter returns an error response, and the action is not invoked. Web API provides a built-in authorization filter, Authorize Attribute.
What are exception filters in Web API?
Exception filters are
filters that can be used to handle unhandled exceptions that are generated in your Web API controller methods
. In other words, you can use exception filters to catch unhandled exceptions in Web API that originate from your controller methods.
What is exception filter in MVC?
Exception filter in MVC
provides an ability to handle the exceptions for all the controller methods at a single location
. This is by creating a class, which inherits from the FilterAttribute and IExceptionFilter interface. … OnException is executed whenever any exception occurs in the controller action method.
What are Web API filters used for?
Web API includes filters
to add extra logic before or after action method executes
. Filters can be used to provide cross-cutting features such as logging, exception handling, performance measurement, authentication and authorization.
How do I use Web API security?
- Authentication – Determining the identity of an end user. In a REST API, basic authentication can be implemented using the TLS protocol, but OAuth 2 and OpenID Connect are more secure alternatives.
- Authorization – Determining the resources an identified user can access.
Which authentication is best for Web API?
OAuth 2.0
is the best choice for identifying personal user accounts and granting proper permissions. In this method, the user logs into a system. That system will then request authentication, usually in the form of a token.
Web API provides a built-in authorization filter, AuthorizeAttribute. This filter checks whether the user is authenticated. If not, it returns HTTP status code 401 (Unauthorized), without invoking the action. You can apply the filter globally, at the controller level, or at the level of individual actions.
How do I register a Web API filter?
To apply the filter to all Web API controllers,
add it to GlobalConfiguration. Filters
. public static class WebApiConfig { public static void Register(HttpConfiguration config) { config. Filters.
Why do we use exception filter?
Exception filters run when some of the exceptions are unhandled and thrown from an invoked action. The reason for the
exception can be anything
and so is the source of the exception.
When should you use an exception filter?
The Exception Filter in the ASP.NET MVC Application is used to
handle any exceptions that occur during the ASP.NET MVC Request processing pipeline
. The ASP.NET MVC Framework provides one in-built attribute called HandleError which is basically used to handle the unhandled exception in the MVC application.
What is exception filter?
Exception Filter is
a new feature of C# 6.0 through which we can use some specified condition with each catch block
. Overview. An Exception Filter is a new feature of C# 6.0 announced by Microsoft at the Visual Studio Connect() event on November 12, 2014 in New York, USA.
What is Cors policy in Web API?
Cross-Origin Resource Sharing in ASP.NET Web API allows cross-domain access to your Web API methods. … CORS is a W3C standard that
allows you to get away from the same origin policy adopted by the browsers to restrict access from one domain to resources belonging to another domain
.
Who can consume Web API?
Almost
any native application running on a mobile device
other than the Windows one can use ASP.NET Web API as backend. Hence, a web API is good for using with native applications which require web services but not SOAP support.
Can we return view from Web API?
You don’t. You can return one or the other, not both
. Frankly, a WebAPI controller returns nothing but data, never a view page. A MVC controller returns view pages.
Is REST API safe?
REST APIs use
HTTP and support Transport Layer Security (TLS) encryption
. TLS is a standard that keeps an internet connection private and checks that the data sent between two systems (a server and a server, or a server and a client) is encrypted and unmodified.
