http (internal): Add StaticContent server test for Netty backend

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #3090 (6f7d184) into master (5a51958) will decrease coverage by 0.02%.
Report is 2 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3090      +/-   ##
==========================================
- Coverage   82.85%   82.84%   -0.02%     
==========================================
  Files         349      349              
  Lines       14681    14681              
  Branches     2487     2487              
==========================================
- Hits        12164    12162       -2     
- Misses       2517     2519       +2     

see 3 files with indirect coverage changes

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