Getting "Method Not Allowed" error when using ASP.NET Web API inside ASP.NET Web Forms

Question

I am trying to implement HMAC authentication using the code given here: http://bitoftech.net/2014/12/15/secure-asp-net-web-api-using-api-key-authentication-hmac-authentication/.

I integrated this code inside my ASP.NET web forms application. I created a folder named "HMACAPI" and added the controllers and filters inside it. I also installed all the required Nuget packages. This is how I am implementing my service methods:

[HMACAuthentication]
[RoutePrefix("api/forms")]
public class FormsController : ApiController
{
    [Route("")]
    public IHttpActionResult Get()
    {
        ClaimsPrincipal principal = Request.GetRequestContext().Principal as ClaimsPrincipal;

        var Name = ClaimsPrincipal.Current.Identity.Name;

        return Ok("test");
    }

    [Route("")]
    public IHttpActionResult Post(string order)
    {
        return Ok(order);
    }
}

This is my route configuration for the API:

GlobalConfiguration.Configure(APIWebFormsProject.API.WebApiConfig.Register);

But when I use client.PostAsJsonAsync(), it's showing Method Not Allowed error. I tried various SO questions but none of their answers are helping.

What I tried:

Removed WebDAV module.
Added [HttpPost] attribute to post method.

I am using "http://localhost:56697/api/forms/" URL to access the API. But I also tried "http://localhost:56697/api/forms" and "http://localhost:56697/api/forms/test".

UPDATE

As suggested by Obsidian Phoenix I was able to run it without [HMACAuthentication] attribute. But I want to implement this with HMAC authentication. So, what can be the reasons for this?

you need to use GlobalConfiguration.Configuration.Routes.MapHttpRoute instead of RouteTable.Routes.MapHttpRoute — MethodMan
– MethodMan, Commented Oct 10, 2015 at 16:25
@MethodMan I tried that. Still not working. And sorry I typed it incorrectly. It's Method Not Allowed error. — Aishwarya Shiva
– Aishwarya Shiva, Commented Oct 10, 2015 at 16:32
Just a check, do you have 'config.MapHttpAttributeRoutes();' as a part of your route configurations. 'config' here is 'HttpConfiguration' in your WebApiConfig — blogbydev
– blogbydev, Commented Oct 10, 2015 at 16:56
Can you add sample code detailing your client side calls to the API? — Obsidian Phoenix
– Obsidian Phoenix, Commented Oct 14, 2015 at 8:00

Taiseer Joudeh · Accepted Answer · 2015-10-12 06:51:16Z

3

I guess your problem with sending HTTP POST to the endpoint (api/forms) and there is nothing to do with HMACAuth attribute, right?

If this is the case then do not sent Order as String, it should be as an POCO object containing string property, something as the below should work:

public class OrderModel
{
    public string Order { get; set; }
}

answered Oct 12, 2015 at 6:51

Taiseer Joudeh

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2 Comments

Aishwarya Shiva Over a year ago

I tried this and also tried your original code. But in both the cases I am getting "Task was cancelled" error.

Aishwarya Shiva Over a year ago

I just found out its working without HMAC attribute. But I want to use HMAC in my app. What can I do?

Obsidian Phoenix · Accepted Answer · 2015-10-13 16:06:37Z

3

+25

You are missing a [FromBody] attribute on your method.

In order to use client.PostAsJsonAsync(url, "test"), your method signature should look like this:

[Route("")]
public IHttpActionResult Post([FromBody] string order)
{
    return Ok(order);
}

Likewise, passing a POCO object:

[Route("")]
public IHttpActionResult Post([FromBody] OrderModel order)
{
    return Ok(order);
}

answered Oct 13, 2015 at 16:06

Obsidian Phoenix

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5 Comments

Aishwarya Shiva Over a year ago

I tried it but its still giving A task was cancelled.

Obsidian Phoenix Over a year ago

Does it still do it if you remove the hmac attribute?

Aishwarya Shiva Over a year ago

Actually its working without HMAC attribute. But I want to use HMAC authentication.

Obsidian Phoenix Over a year ago

Sure. I just wanted to narrow down the issue. I'll take another look later

Aishwarya Shiva Over a year ago

Thank you. I will wait for ur answer and mark it if it solves the problem. :)

Aishwarya Shiva · Accepted Answer · 2015-10-27 20:04:22Z

0

Finally, I solved this. I didn't expected that this will be a solution.

I changed the port and used Local IIS server instead of Visual Studio Development Server. Although I was using IIS before I asked the question but I think port changing solved the issue.

Well, thanks everyone for your efforts in solving my problem. Because of all your answers and comments I was able to come to this solution. :)

answered Oct 27, 2015 at 20:04

Aishwarya Shiva

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