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Which is the default route template for web API?
The default route template for Web API is “api/ {controller}/ {id}”. In this template, “api” is a literal path segment, and {controller} and {id} are placeholder variables. When the Web API framework receives an HTTP request, it tries to match the URI against one of the route templates in the routing table.
Where is the routing table in Visual Studio?
When the Web API framework receives a request, it routes the request to an action. To determine which action to invoke, the framework uses a routing table. The Visual Studio project template for Web API creates a default route: This route is defined in the WebApiConfig.cs file, which is placed in the App_Start directory:
Which is the default value for a route parameter?
Route parameters may have default values designated by specifying the default value after the parameter name separated by an equals sign (=). For example, {controller=Home} defines Home as the default value for controller. The default value is used if no value is present in the URL for the parameter.
How to change route table in web API?
Of course, if you don’t like this convention, you can change the default route table. Once a matching route is found, Web API selects the controller and the action: To find the controller, Web API adds “Controller” to the value of the {controller} variable.
What happens if ID is omitted from Route template?
The id is defined as optional by the route template, meaning that your actions can execute without the ID provided as part of the URL. Usually what will happen if id is omitted from the URL is that it will be set to 0 by model binding, and as a result no entity will be found in the database matching id == 0.
How to route to controller action in ASP.NET Core?
When using Url.Action, the current route values for controller and action are specified for you – the value of controller and action are part of both ambient values and values. The method Url.Action , always uses the current values of action and controller and will generate a URL path that routes to the current action.
What happens if route values don’t match action?
As part of request processing, MVC will verify that the route values can be used to find a controller and action in your application. If the route values don’t match an action then the route isn’t considered a match, and the next route will be tried. This is called fallback, and it’s intended to simplify cases where conventional routes overlap.
What happens when route does not match in web API?
When the Web API framework receives an HTTP request, it tries to match the URI against one of the route templates in the routing table. If no route matches, the client receives a 404 error. For example, the following URIs match the default route: However, the following URI does not match, because it lacks the “api” segment:
How to set the routing table in ASP.NET?
If you self-host Web API, you must set the routing table directly on the HttpSelfHostConfiguration object. For more information, see Self-Host a Web API. Each entry in the routing table contains a route template. The default route template for Web API is “api/{controller}/{id}”.