server: prevent using UDP when tunneling through HTTP

[aler9]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.94%. Comparing base (425fce2) to head (030f71b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
server_session.go	42.85%	4 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #896      +/-   ##
==========================================
- Coverage   81.96%   81.94%   -0.02%     
==========================================
  Files         121      121              
  Lines       14310    14313       +3     
==========================================
  Hits        11729    11729              
- Misses       2056     2058       +2     
- Partials      525      526       +1     

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