Description
At the moment it's quite hard to debug HTTP errors because the only information we get is:

HTTP/1.1 400 Bad Request returned for "https://example.com/".

It would be nice to have an opt-in option that would automatically open response payload and headers in order to log them in Sentry for example. It may require to handle a max lenght on the response payload.

So if you happen to insert invalid version string when requiring package, it will still write it into composer.json and nothing works after that. So for example; composer require phpunit/phpunit:"8.3.3 as ^8.3"

My composer.json:

{
    "require": {
        "phpunit/phpunit": "8.3.3 as ^8.3"
    }
}

Output of composer diagnose:

$ composer diagnose
        

Under the 'Theme' settings tab you can upload images. It would be great if vector images can be added so it can scale without causing artifacts.

When creating or editing a relationship, we should group the relationship type list with the same tag as on the contact page (Love, Family, Other kind, ...), i.e. with an element.

In this line, The $config variable defined as an array but used as an object

https://github.com/octobercms/october/blob/af6db51b7978aae874844e79e0103b0952d7b762/modules/backend/classes/ControllerBehavior.php#L26