fix: allways init response header map at first.

[tanopanta]

Describe the PR
fix: allways init response header map at first.

• to generate headers only "all".
  • fix PR improve code quality #1049
• refactor

Relation issue
closes #1065

[codecov]

Codecov Report

Merging #1066 (9bf6735) into master (305a5cf) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 9bf6735 differs from pull request most recent head 34ca095. Consider uploading reports for the commit 34ca095 to get more accurate results

@@           Coverage Diff           @@
##           master    #1066   +/-   ##
=======================================
  Coverage   94.42%   94.43%           
=======================================
  Files           9        9           
  Lines        2261     2264    +3     
=======================================
+ Hits         2135     2138    +3     
  Misses         66       66           
  Partials       60       60           

Impacted Files	Coverage Δ
operation.go	95.90% <100.00%> (+0.02%)	⬆️

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[ubogdan]

@tanopanta swag has quite low code coverage. It looks like this part was not covered and it was looking fine to me according to existing unit tests.

[ubogdan]

@tanopanta Thanks for your contribution.

[ubogdan]

LGTM