wrap a transport to log the body

transport-loggging.go

import 	"github.com/motemen/go-loghttp"

httpClient.Transport = &loghttp.Transport{
		Transport: httpClient.Transport,
		LogRequest: func(req *http.Request) {
			b, _ := httputil.DumpRequestOut(req, true)
			log.Printf("out body: %s", string(b))
		},
		LogResponse: func(resp *http.Response) {
			b, _ := httputil.DumpResponse(resp, true)
			log.Printf("in body: %s", string(b))
		},
	}