From 2d3ce25e9aad1d581a13ce3135495241291bfb6d Mon Sep 17 00:00:00 2001
From: Burcu Dogan <jbd@google.com>
Date: Wed, 12 Nov 2014 10:02:14 +1100
Subject: [PATCH] Don't mutate the authorization endpoint.

Flow should be reusable, Options object should not be
mutated by the calls performed on the flow.
---
 oauth2.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/oauth2.go b/oauth2.go
index 0062f59..ce166b1 100644
--- a/oauth2.go
+++ b/oauth2.go
@@ -145,7 +145,7 @@ func New(options ...Option) (*Flow, error) {
 // access token. If set to "force" the user will always be prompted,
 // and the code can be exchanged for a refresh token.
 func (f *Flow) AuthCodeURL(state, accessType, prompt string) string {
-	u := f.opts.AuthURL
+	u := *f.opts.AuthURL
 	v := url.Values{
 		"response_type":   {"code"},
 		"client_id":       {f.opts.ClientID},