handle a http.NoBody io.reader

[emilien-puget]

using a http.NoBody yields a content length of -1

as per the documentation of request.ContentLength

	// ContentLength records the length of the associated content.
	// The value -1 indicates that the length is unknown.
	// Values >= 0 indicate that the given number of bytes may
	// be read from Body.
	//
	// For client requests, a value of 0 with a non-nil Body is
	// also treated as unknown.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (42f07ed) 92.87% compared to head (cbc930e) 92.87%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2468   +/-   ##
=======================================
  Coverage   92.87%   92.87%           
=======================================
  Files          39       39           
  Lines        4616     4616           
=======================================
  Hits         4287     4287           
  Misses        239      239           
  Partials       90       90           

Impacted Files	Coverage Δ
bind.go	88.88% <100.00%> (ø)

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