old_contents: from uuid import UUID
  
  from werkzeug.routing import BaseConverter
  
  
  class UUIDConverter(BaseConverter):
      to_python = UUID
      to_url = str
  
new_contents: from uuid import UUID
  
  from werkzeug.routing import BaseConverter
  
  
  class UUIDConverter(BaseConverter):
      to_python = UUID
  
      def to_url(self, obj):
          return str(obj).replace('-', '')
  
subject: Drop dashes from download urls.