use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/golang.org/x/oauth2/transport.go

@@ -31,17 +31,9 @@ type Transport struct {
 }
 
 // RoundTrip authorizes and authenticates the request with an
-// access token from Transport's Source.
+// access token. If no token exists or token is expired,
+// tries to refresh/fetch a new token.
 func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
-	reqBodyClosed := false
-	if req.Body != nil {
-		defer func() {
-			if !reqBodyClosed {
-				req.Body.Close()
-			}
-		}()
-	}
-
 	if t.Source == nil {
 		return nil, errors.New("oauth2: Transport's Source is nil")
 	}
@@ -54,10 +46,6 @@ func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
 	token.SetAuthHeader(req2)
 	t.setModReq(req, req2)
 	res, err := t.base().RoundTrip(req2)
-
-	// req.Body is assumed to have been closed by the base RoundTripper.
-	reqBodyClosed = true
-
 	if err != nil {
 		t.setModReq(req, nil)
 		return nil, err