fix(maleo-core/server): unique header and head

[alvinkl]

Pre-Submission Checklist

• Your pull request targets the canary branch of Maleo.js.
• Branch starts with either fix/, feature/, etc (e.g. fix/build-issue. more info)
• You have only one commit (if not, squash them into one commit).
• [] All new and existing tests pass the command yarn test. Use git commit --amend to amend any fixes.

Type of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Optimization (non-breaking change which provides better optimization)
• Breaking change (fix or feature that would change existing functionality)
• Add new translation (feature adding new translations)
• Update Documentation (added new docs or doc updates)
• Other ( )

Checklist:

• Tested changes locally.
• Addressed currently open issue (replace XXXXX with an issue no in next line)

Closes #XXXXX

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Description

give unique header and head for server

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