Properly parsing request body when http.NoBody is used
          #168
        
          
      
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This fix corrects a behavior when
http.NoBodyis used as the request body, as currently, theretryablehttp.getBodyReaderAndContentLength()function will return aReaderFuncthat when called returns anio.Reader, that will output a literal"0"string on the wire as the HTTP request body.As such, a fix & test has been implemented to no-op when
http.NoBodyis used.This issue was found as I was testing this library when a
POSTrequest was being done with no request body.