Authorization has been denied for this request - New Web API Project

Question

I just created new Web API project (using MVC) in visual studio 2015 and for the testing purpose, I ran that project but ended up below error.

After running the project, it brings up Home Page correctly but when I navigated to /api/values or /api/values/5, it gives me below xml message.

<Error>
    <Message>Authorization has been denied for this request.</Message>
</Error>

Can someone please help? I am new to Web API. Please note that I don't want to remove the Authorize attribute. I would like to access the resource after authorization only. So I am looking for what is wrong.

Answer 1

In the ValuesController there is an attribute Authorize if you remove it, then it will work as home page.

The Authorize attribute just prevent an anonymous users from accessing the ValuesController .

to work with this attribute, you need first to register a user, and then login to get user's token, then you can use the token to authorize your self and get access.

In this page Individual-accounts-in-web-api is explained all what do you need

Answer 2

It happens because you have an Authorize attribute on your ValuesController

[Authorize]
public class ValuesController : ApiController

Just remove [Authorize] and try again

EDIT

According to your edit: You should create a new user and login or use [AllowAnonymous] as mentioned by @Marcus H. Read more about Identity

Answer 3

I got the answer here.

https://stackoverflow.com/a/29405794/8107314

And it was very useful to fix my error my error

I just came across the same problem and found the solution:

You need to register the OAuth Token Generator and OAuth Token Consumer things before WebAPI is registered.

Kind of makes sense if you think of this as a pipeline, where Authentication/Authorization should come before any request handling by the controllers.

TL;DR: Change

appBuilder.UseWebApi(config);

this.ConfigureOAuthTokenGenerator(appBuilder);
this.ConfigureOAuthConsumer(appBuilder);

To

this.ConfigureOAuthTokenGenerator(appBuilder);
this.ConfigureOAuthConsumer(appBuilder);

appBuilder.UseWebApi(config);

Answer 4

I just created new Web API project (using MVC) in visual studio 2015 and for the testing purpose, I ran that project but ended up below error.

After running the project, it brings up Home Page correctly but when I navigated to /api/values or /api/values/5, it gives me below xml message.

<Error>
    <Message>Authorization has been denied for this request.</Message>
</Error>

Can someone please help? I am new to Web API. Please note that I don't want to remove the Authorize attribute. I would like to access the resource after authorization only. So I am looking for what is wrong.