Sunny Side Up

try: ```php new \GuzzleHttp\Client(['headers' => ['User-Agent' => null]]); ```

see: https://github.com/guzzle/guzzle/issues/894

Ignore my comments, I thought it was helpful, but perhaps it is not.

Thanks to people helping me: 

I think it would be better to have a bit more explanation on how / when / etc... to use this variable and why it is different from the usual...

We run into issues with the sequence on how CMS Fields are put together a lot (almost daily) so I dont see that as an edge case. You see that...

_Simply speaking, a callback here is the only consistent way to add something in between the inheritance chain and extensions._ Yeah agree. It is the only way ...and so I...

I can confirm that this is still an issue in 4.4 and on that it can also be seen on the demo site: https://demo.silverstripe.org/admin/pages/?q%5BFilterClass%5D=SilverStripe%5CCMS%5CControllers%5CCMSSiteTreeFilter_PublishedPages&q%5BClassName%5D=SilverStripe%5CErrorPage%5CErrorPage End-users expect this to be an...

note alignment improvements: 

This is all a bit hacky, but I would recommend that this gets changed properly if time allows.