MVC 6 Web Api: Resolving the location header on a 201 (Created)

I didn't realise it, but the CreatedAtAction() method caters for this:

return CreatedAtAction("GetClient", new { id = clientId }, clientReponseModel);

Ensure that your controller derives from MVC's Controller.

In the new ASP.NET MVC Core there is a property Url, which returns an instance of IUrlHelper. You can use it to generate a local URL by using the following:

[HttpPost]
public async Task<IActionResult> Post([FromBody] Person person)
{
  _DbContext.People.Add(person);
  await _DbContext.SaveChangesAsync();

  return Created(Url.RouteUrl(person.Id), person.Id);
}