* Add ROUTE_PREFIX parameter for working with reverse proxies.
* [flake8/E304] remove blank line after function decoder
* Add APPLICATION_ROOT and use route_prefix in requests.
* [black/code-styling] use double quotes instead of single.
* handle right events url depending route path
* properly handle redirects
* [flake8] remove unused module, fix styling issues
Co-authored-by: Henning Jacobs <henning@jacobs1.de>
