| ⇢ | A | ClientShowException added | 
| ⇢ | A | ClientShowException::sendHeader() added | |
| ⇢ | A | Error401Exception::handleHeader() added | |
| ⇢ | A | Error402Exception::handleHeader() added | |
| ⇢ | A | Error403Exception::handleHeader() added | |
| ⇢ | A | Error404Exception::handleHeader() added | |
| ⇢ | A | Error405Exception::handleHeader() added | |
| ⇢ | A | Error501Exception::handleHeader() added | |
| ⇢ | A | Error520Exception::handleHeader() added | |
| C | ↗ | A | WhoopsHeaderTrait::setProperHeader() improved |