if rt == nil {
		req.closeBody()
		return nil, alwaysFalse, errors.New("http: no Client.Transport or DefaultTransport")
	}

	if req.URL == nil {
		req.closeBody()
		return nil, alwaysFalse, errors.New("http: nil Request.URL")
	}

	if req.RequestURI != "" {
		req.closeBody()

		if err != nil {
			return nil, err
		}
	}
	if !isHTTP {
		req.closeBody()
		return nil, badStringError("unsupported protocol scheme", scheme)
	}
	if req.Method != "" && !validMethod(req.Method) {
		req.closeBody()
		return nil, fmt.Errorf("net/http: invalid method %q", req.Method)
	}
	if req.URL.Host == "" {
		req.closeBody()
		return nil, errors.New("http: no Host in request URL")
	}

		return err
	}

	// Write body and trailer
	err = tw.writeBody(w)
	if err != nil {
		return err
	}

	// Success
	return nil
}

func (r *Response) closeBody() {
	if r.Body != nil {
		r.Body.Close()
	}
}

// bodyIsWritable reports whether the Body supports writing. The
// Transport returns Writable bodies for 101 Switching Protocols
// responses.

		defer func() {
			trace.WroteRequest(httptrace.WroteRequestInfo{
				Err: err,
			})
		}()
	}
	closed := false
	defer func() {
		if closed {
			return
		}
		if closeErr := r.closeBody(); closeErr != nil && err == nil {
			err = closeErr
		}
	}()

	// Find the target host. Prefer the Host: header, but if that
	// is not given, use the host from the request URL.
	//

		w.WriteHeader(StatusNoContent)
	})).ts

	c := ts.Client()
	for _, closeBody := range []bool{true, false} {
		const n = 4
		for i := 1; i <= n; i++ {
			res, err := c.Get(ts.URL)
			if err != nil {
				t.Errorf("closingBody=%v, req %d/%d: %v", closeBody, i, n, err)
			} else {
				if closeBody {
					res.Body.Close()
				}
			}
		}
	}
}