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Alan
Asked: 2020-01-30 11:08:29 +0800 CST 2020-01-30 11:08:29 +0800 CST

Error 404 when trying to do an httpget to an Action of a webapi controller

  • 772

I add a controller webapi, the IDE takes care of generating the class WebApiConfigand registering the configurations in it global.asax, so far everything is perfect. I run my application I try to access one Actionof my own controllerand I get a 404 error.

As I had previously had routing problems (due to ignorance) I suppose that it is due to something similar.

My WebApiConfig

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.MapHttpAttributeRoutes();

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

Global.asax

    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);


        GlobalConfiguration.Configure(WebApiConfig.Register);
    }

Controller Webapi:GerenciasController

    public IEnumerable<Gerencia> Get()
    {
        ...
    }

The most curious thing for me is that I have another one controllerthat works, the difference is that in me getI specify a different routing than the default one.

    [Route("api/Legajo/{idCompania}/{idLocal}/{fecha}")]
    public IEnumerable<Legajo> Get(short idCompania, short idLocal, string fecha)
    {
      ...
    }

I clarify that I am doing a httpget:

    $.getJSON('/api/Gerencias/', null, function (data) {
       ...
    });

I also tried from my browser directly accessing the route:

http://misitio/api/Gerencias/

enter image description here

asp.net-mvc-5

3 Answers

  1. Remember that Get()you must invoke it using the correct http verb, it will only access it if you used a GETdel http.

    Using the GETas a verb and the url http://{sitio}/api/nombreControllershould work

    You can use postman or fiddler to test the webapi.

    Also try to define the attributes

    [Route("api/Gerencias")]
[HttpGet]
public IEnumerable<Gerencia> Get(){

}

    I am commenting on this because of what I saw in this article.

    Attribute Routing in ASP.NET Web API 2

    Another way could be

    [Route("")]
public IEnumerable<Gerencia> Get(){

}

    Analyze in the article the title "Route Prefixes" there mentions what I comment. It is further in the controller defines the attribute[RoutePrefix("api/books")]

    • 2
  2. Best Answer

    I found the problem, it is the order of registering the routing configurations. It IDEautomatically adds everything to the end for you (see my question), this causes the aforementioned malfunction.

    protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    //Registrar aquí las configuraciones webapi
    GlobalConfiguration.Configure(WebApiConfig.Register);

    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
    RouteConfig.RegisterRoutes(RouteTable.Routes);
    BundleConfig.RegisterBundles(BundleTable.Bundles);


    //no registrar aquí las configuraciones webapi
}
    • 2

  3. Try adding the action tag to the routerTemplate property , for example:

    config.Routes.MapHttpRoute(
    name: "DefaultApi",
    routeTemplate: "api/{controller}/{action}/{id}",
    defaults: new { id = RouteParameter.Optional }
);
    • 1