This will fix the 16th miscellaneous issue, with too much verbose error logging.

I try to handle the post request basically the same way as the previously implemented InvalidApPostException exceptions like in the getCollectionObjectImpl function.

This meaning the content logging will be part of the catch -> logRequestException function instead. And the InvalidApPostException exception will only log the request body, but no longer the response content. Also we log the status code now as well for failed post requests. Plus some small refactoring.

Last but not least, I will only do a json_encode once.