add test and fix for POST without body and Content-type, issue #492

[emicklei]

No description provided.

[codecov-commenter]

Codecov Report

Merging #496 (c7b828b) into v3 (2326c8e) will decrease coverage by 0.14%.
The diff coverage is 54.87%.

@@            Coverage Diff             @@
##               v3     #496      +/-   ##
==========================================
- Coverage   70.07%   69.93%   -0.15%     
==========================================
  Files          26       27       +1     
  Lines        1223     1603     +380     
==========================================
+ Hits          857     1121     +264     
- Misses        293      407     +114     
- Partials       73       75       +2     

Impacted Files	Coverage Δ
extensions.go	0.00% <0.00%> (ø)
filter.go	54.54% <ø> (-1.02%)	⬇️
route.go	85.07% <0.00%> (+1.74%)	⬆️
parameter.go	43.52% <25.00%> (-15.10%)	⬇️
container.go	75.43% <87.50%> (+2.42%)	⬆️
compress.go	77.96% <100.00%> (-1.21%)	⬇️
jsr311.go	80.00% <100.00%> (+3.70%)	⬆️
route_builder.go	71.25% <100.00%> (-0.29%)	⬇️
web_service.go	69.74% <100.00%> (+0.70%)	⬆️
... and 25 more

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