[FEATURE] set a default callback for header when none is defined

set a default callback for header when none is defined

__Tasks:__
- [x] set default callback 
- [ ] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| Tests pass?   | none
| Fixed tickets | none
| Doc           | none