code: func copyRequest(dstRequest *http.Request, srcRequest *http.Request, buffer io.Reader) {
  	*(dstRequest) = *(srcRequest)
  	dstRequest.URL = utils.CopyURL(srcRequest.URL)
  	dstRequest.Header = make(http.Header)
  	utils.CopyHeaders(dstRequest.Header, srcRequest.Header)
  	dstRequest.ContentLength = srcRequest.ContentLength
  
  	dstRequest.TransferEncoding = []string{}
  	dstRequest.Body = ioutil.NopCloser(buffer)
  }
docs: // Helpers