fix: api server write json

[vagetablechicken]

closes #3347

[tobegit3hub]

LGTM

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (7b7a371) 75.59% compared to head (acc5c9f) 75.59%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3366      +/-   ##
============================================
- Coverage     75.59%   75.59%   -0.01%     
  Complexity      414      414              
============================================
  Files           692      692              
  Lines        126093   126130      +37     
  Branches       1206     1206              
============================================
+ Hits          95317    95342      +25     
- Misses        30535    30547      +12     
  Partials        241      241              

Impacted Files	Coverage Δ
src/apiserver/api_server_impl.cc	0.00% <0.00%> (ø)
src/apiserver/api_server_test.cc	0.00% <0.00%> (ø)

... and 13 files with indirect coverage changes

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