server: use relative control attributes

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.69767% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.84%. Comparing base (c682ff5) to head (987da37).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
server_session.go	88.57%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #620      +/-   ##
==========================================
- Coverage   81.86%   81.84%   -0.03%     
==========================================
  Files         115      115              
  Lines       11637    11612      -25     
==========================================
- Hits         9527     9504      -23     
+ Misses       1706     1703       -3     
- Partials      404      405       +1     

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