Making a simple Web API post request

Question

I'm really struggling with making a basic post request in a url to support a tutorial on web api.

I want to do something like this in browser: http://localhost:59445/api/group/post/?newvalue=test and get the post to register. However I don't seem to be able to form the request correctly. What is the correct way to do this?

The error I receive is:

{"Message":"The request is invalid.","MessageDetail":"The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.String Get(Int32)' in 'twin_groupapi.Controllers.GroupController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter."}

my model:

    public class Group  
    {
     public Int32 GroupID { get; set; }
     public Int32 SchoolID { get; set; }
     public string GroupName { get; set; }
    }

routing:

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

        GlobalConfiguration.Configuration.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always;
        // Web API routes
        config.MapHttpAttributeRoutes();

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

controller:

    //[Route("api/Group/Post")]
    [HttpPost]
    public void Post([FromUri] string NewValue)
    {

        string newstring = NewValue;

    }

Do you have another method with name post and verb as httpget? — Sateesh Pagolu
only other verb is // GET: api/Group [Route("api/Group/Get")] [HttpGet] public Array Get() — oooo ooo

StriplingWarrior StriplingWarrior · Accepted Answer · 2016-12-14T23:40:11

Hitting a URL in your browser will only do a GET request.

You can either:

create a simple <form> with its method set to POST and form inputs to enter the values you want to send (like NewValue), OR
write some JavaScript to create an AJAX POST request using your favorite framework, OR
Use a tool like Postman to set up a POST request, invoke it, and examine the results.

Making a simple Web API post request

2 Answers