Throwing arbitrary error codes

[Perlkonig]

From within the Grav core code, I want to be able to emit an arbitrary HTTP status code. I'm told I should be able to do something like throw new \RuntimeException("Should be a 406", 406);, but that doesn't actually work.

I want to make changes to Grav\Common\Twig\Twig.php, specifically the processSite function. So I try the following:

public function processSite($format = null, array $vars = [])
{
    throw new \RuntimeException("Should be a 406", 406);
    ...
}

What I get is an error page with a status header of 500. I've tried tracing back where the status code gets set, but I can't find it. I would appreciate any assistance in understanding the lifecycle here. The earliest I can find is the end of index.php. But I can't find any code that triggers onFatalException.

[mahagr]

FYI: This is something that is limited by Whoops -- it will always use 500 errors in its responses. Overriding error handlers (especially for JSON) may be helpful, but requires some core changes.

[Perlkonig]

Well this gives me a place to look, at least. Whoops\Run has a sendHttpCode function. I guess I'll start from there.

So does this mean that existing calls like this and this in Grav core aren't actually working either?

[mahagr]

Some of the exceptions are catched by Grav or plugins so they work.

[Perlkonig]

PR submitted.