use-cases and some errors

use-case 1

• if amqp server in cloudamqp - docker container works only with -e DEBUG=True

use-case 2

• if url path contains - there is no exchange will be created, but service return 200 - for example example.com/webhook/my-super-queues will be fail, but example.com/webhook/mysuperqueues will be correct creation

use-case 3

• if my server does not want use path prefix (-e PATH_PREFIX="") service return an 400 Bad request