Refactor clients and headers

[yosuke-furukawa]

No description provided.

[codecov-io]

Codecov Report

Merging #31 into master will increase coverage by 0.24%.
The diff coverage is 93.02%.

@@            Coverage Diff            @@
##           master     #31      +/-   ##
=========================================
+ Coverage   91.96%   92.2%   +0.24%     
=========================================
  Files          27      27              
  Lines         510     513       +3     
=========================================
+ Hits          469     473       +4     
+ Misses         41      40       -1

Impacted Files	Coverage Δ
lib/template/constants.js	100% <100%> (ø)	⬆️
lib/check/diff.js	89.28% <100%> (+0.39%)	⬆️
lib/template/hasTemplate.js	90% <100%> (+2.5%)	⬆️
lib/server.js	93.75% <100%> (+0.09%)	⬆️
lib/client.js	94.44% <90.32%> (+1.34%)	⬆️

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