Ignoring route parameters in ASP.NET MVC WebAPI

Question

I have following web api controller:

public class ProductController : ProductControllerBase
{
 public async Task<string> Lookup(string id)
{
   // do lookup
}

public async Task<string> Search(string keywords)
{
    // do search
}
}

Sample requests to this api:
http://localhost/api/product/Lookup?provider=amazon&id=B07CSPSMQY
http://localhost/api/product/Lookup?provider=walmart&id=4132478AB
http://localhost/api/product/Lookup?provider=ebay&id=EWRHNFKASDN231

I am fetching provider in base class, because I use it for IoC purposes:

public ProductControllerBase()
{
    string provider = HttpContext.Current.Request.QueryString["provider"];
    // resolve search provider depending on parameter
    SetController(provider);
}

In my WebApiConfig I have following setup:

config.Routes.MapHttpRoute(
    "ProductControllerLookup",
    "api/product/Lookup/{provider}/{id}",
    new
    {

    }
);

but once I run URLs above, I keep getting following error:

{"Message":"The requested resource does not support http method 'GET'."}

What I want is to fetch parameters other than "provider", since I did not want to use it for all methods.

How can I configure this one?

Did you try adding explicitly attribute Get on the actions? ` [System.Web.Http.HttpGet] public async Task<string> Lookup(string id) { // do lookup return ""; }` — Selvirrr
– Selvirrr, Commented Aug 28, 2018 at 0:22
If I only send id parameter but not provider it hits the method. But if I send both id and provider I got error above. — Teoman shipahi
– Teoman shipahi, Commented Aug 28, 2018 at 1:00

Selvirrr · Accepted Answer · 2018-08-28 09:58:45Z

1

I've tested the code just with adding [HttpGet] attribute, and it seems to be ok, here is my WebApiConfig

public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services

        // Web API routes
        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

        config.Routes.MapHttpRoute(
           "ProductControllerLookup",
           "api/product/Lookup/{provider}/{id}",
            new {}
        );
    }

And here is the method:

[System.Web.Http.HttpGet]
    public async Task<string> Lookup(string id)
    {
        var temp = HttpContext.Current.Request.QueryString["provider"];
        // do lookup
        return "";
    }

And I'm using your url's and all of them are hitting the method and id and provider are filled.

answered Aug 28, 2018 at 9:58

Selvirrr

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2 Comments

Teoman shipahi Over a year ago

OK, thanks for your test. Looks like order of Routes setting was not correct. When I move ProductControllerLookup below to DefaultApi it started to work.

Teoman shipahi Over a year ago

And yes, seems like adding System.Web.Http.HttpGet worked.

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