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?

• Selvirrr: Did you try adding explicitly attribute Get on the actions? ` [System.Web.Http.HttpGet] public async Task<string> Lookup(string id) { // do lookup return ""; }`
• Teoman shipahi: 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.

Answer 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.

• Teoman shipahi: 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: And yes, seems like adding System.Web.Http.HttpGet worked.