Fix: rewind body before reading it.

[dblock]

Closes #506.

[coveralls]

Pull Request Test Coverage Report for Build 7729093569

• 10 of 10 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.06%) to 89.108%

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Totals
Change from base Build 7718739724:	-0.06%
Covered Lines:	5056
Relevant Lines:	5674

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 7729511010

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 10 of 10 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 89.184%

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Totals
Change from base Build 7718739724:	0.02%
Covered Lines:	5063
Relevant Lines:	5677

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💛 - Coveralls