Backport to 1912

[ahopkins]

See #1849

[codecov]

Codecov Report

Merging #1900 into 19.12LTS will decrease coverage by 2.71%.
The diff coverage is 57.14%.

@@             Coverage Diff              @@
##           19.12LTS    #1900      +/-   ##
============================================
- Coverage     92.30%   89.59%   -2.72%     
============================================
  Files            22       25       +3     
  Lines          2274     2930     +656     
  Branches        419      543     +124     
============================================
+ Hits           2099     2625     +526     
- Misses          135      233      +98     
- Partials         40       72      +32     

Impacted Files	Coverage Δ
sanic/server.py	74.83% <16.66%> (ø)
sanic/app.py	91.91% <84.61%> (-0.35%)	⬇️
sanic/response.py	100.00% <100.00%> (ø)
sanic/worker.py	82.64% <0.00%> (-0.15%)	⬇️
sanic/router.py	95.49% <0.00%> (-0.07%)	⬇️
sanic/request.py	99.60% <0.00%> (-0.03%)	⬇️
sanic/testing.py	97.91% <0.00%> (-0.03%)	⬇️
sanic/views.py	100.00% <0.00%> (ø)
... and 5 more

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