Don't stop the browser on 4xx/5xx status code

[krichprollsch]

Currently the browser stops if the first request returns a 4xx/5xx response.
It's better to continue the process to treat return HTML too.

[krichprollsch]

Relevant example: https://www.carsales.com.au/cars/details/2016-hyundai-tucson-active-auto-2wd-my17/OAG-AD-23989268/?gts=OAG-AD-23989268&gtsSaleId=OAG-AD-23989268&gtsViewType=topspot&rankingType=topspot