Support cuddle http body close with error check

[bombsimon]

This resolves #31

The implementation is very specific to this use case but I imagine this is the only way not already allowed which should be supported. If there are more cases needed to handle this we can add them later!

[coveralls]

Pull Request Test Coverage Report for Build 105

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 86.404%

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Totals
Change from base Build 102:	0.07%
Covered Lines:	966
Relevant Lines:	1118

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💛 - Coveralls