WIP: Alternative heat to get

[aldas]

Proposal for alternative solution to #2944 - do not register extra routes. use router internals to fallback from head to get. these extra IF checks do not register as meaningful change when running benchstat, but registering another route along with GET looks like a quick hack.

store benchmarks for this change

go test -run="-" -bench=".*" -count=8 ./... > benchmark_with_head.txt

check out current version

go test -run="-" -bench=".*" -count=8 ./... > benchmark_5_1_0.txt

and compare these two

benchstat benchmark_5_1_0.txt benchmark_with_head.txt 

[codecov]

Codecov Report

❌ Patch coverage is 82.69231% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.09%. Comparing base (22e4b71) to head (49b5ca9).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
response.go	77.50%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2949      +/-   ##
==========================================
+ Coverage   93.07%   93.09%   +0.01%     
==========================================
  Files          43       43              
  Lines        4506     4545      +39     
==========================================
+ Hits         4194     4231      +37     
  Misses        195      195              
- Partials      117      119       +2     

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