[FEATURE] Implemented extract format

__Tasks:__

- [x] test coverage
- [ ] gather feedback for my changes


__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | none
| BC Breaks     | none
| Doc           | none
the last information of mine thomas means that we allow all extensions ... perhaps we shouldnt allow `.` in url?