Say I have an `ApiController` with the following method:

```
[HttpGet]
IEnumerable<MyType> GetSomeOfMyType( )
{
    return new MyType[ 10 ];
}

```

And I want to modify one of the response headers, how would I go about converting this method to allow that?

I'm guessing I need to manually create a response and serialise my data into it, but how?

Thanks.