Context: json should not send status code before serialization is complete

[aldas]

Context: json should not send status code before serialization is complete

Relates to #2866 (comment)

[codecov]

Codecov Report

❌ Patch coverage is 28.00000% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.02%. Comparing base (f24aaff) to head (fbffb62).
⚠️ Report is 53 commits behind head on master.

Files with missing lines	Patch %	Lines
response.go	5.26%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2877      +/-   ##
==========================================
- Coverage   93.25%   93.02%   -0.23%     
==========================================
  Files          39       43       +4     
  Lines        4652     4456     -196     
==========================================
- Hits         4338     4145     -193     
+ Misses        218      194      -24     
- Partials       96      117      +21     

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