test(http): use constant instead of numeric literal

[testwill]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.36%. Comparing base (3dc1cd6) to head (780fbe2).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3863      +/-   ##
==========================================
+ Coverage   99.21%   99.36%   +0.15%     
==========================================
  Files          42       43       +1     
  Lines        3182     2676     -506     
==========================================
- Hits         3157     2659     -498     
+ Misses         17        9       -8     
  Partials        8        8              

Flag	Coverage Δ
	?
-race	∅ <ø> (?)
-tags "sonic avx"	99.35% <ø> (?)
-tags go_json	99.35% <ø> (?)
-tags nomsgpack	99.35% <ø> (?)
go-1.18	99.28% <ø> (+0.16%)	⬆️
go-1.19	99.36% <ø> (+0.15%)	⬆️
go-1.20	99.36% <ø> (+0.15%)	⬆️
go-1.21	99.36% <ø> (+0.15%)	⬆️
go-1.22	99.36% <ø> (?)
macos-latest	99.36% <ø> (+0.15%)	⬆️
ubuntu-latest	99.36% <ø> (+0.15%)	⬆️

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