[refactor] use new NullableDict for lib/http

[hyorigo]

No description provided.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.02% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (d9054a5)	4572	4236	92.65%
Head commit (f198f9b)	4557 (-15)	4221 (-15)	92.63% (-0.02%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#100)	81	81	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

Attention: Patch coverage is 97.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 90.10%. Comparing base (d9054a5) to head (f198f9b).

Files	Patch %	Lines
lib/http/http.go	66.66%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
- Coverage   90.13%   90.10%   -0.04%     
==========================================
  Files          39       38       -1     
  Lines        4440     4425      -15     
==========================================
- Hits         4002     3987      -15     
  Misses        330      330              
  Partials      108      108              

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