This is a very simple solution and should give you a very basic starting point. I think it may be worth while checking out some tutorials on Web API.

//Create web api method to return hello world
public class TestApiController : UmbracoApiController
{
    [HttpGet]
    public string Get()
    {
        return "Hello World";
    }
}
//Create method to call web api function, this method can be placed   
//inside a controller e.g. inside you home controller

public class HomeController : Umbraco.Web.Mvc.RenderMvcController
{
   public override ActionResult Index(RenderModel model)
   {
    //call web api method 
    var text = GetHelloWorldText();

    return base.Index(model);
   }
}

public string GetHelloWorldText()
{
    using (var client = new HttpClient())
    {
       var result =
           client.GetStringAsync("http://url/umbraco/api/testapi/get")
           .Result;

            return result;
    }
 }

You can then pass the text into the view via a model, TempData or ViewBag. You could also call the web api method from within your view using Javascript.

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