跨域问题

 ```go func loginOidc(c *gin.Context) { _, cfg := oidcx.NewProviderAndConfig() state, err := oidcx.RandString(16) if err != nil { ginx.NewRender(c).Message("InternalServerError") return } c.Redirect(http.StatusFound, cfg.AuthCodeURL(state)) } func callbackOidc(c *gin.Context) { provider, cfg := oidcx.NewProviderAndConfig() // 获取token oauth2Token, err := cfg.Exchange(c, c.Request.URL.Query().Get("code")) if err != nil { ginx.NewRender(c).Message("Failed to exchange token: " + err.Error()) return } // 获取userInfo userInfo, err := provider.UserInfo(c, oauth2.StaticTokenSource(oauth2Token)) if err != nil { ginx.NewRender(c).Message("Failed to get userinfo: " + err.Error()) return } // 获取的的user信息入库 user, err := models.OidcLogin(userInfo) if err != nil { ginx.NewRender(c).Message("Failed to find user: " + err.Error()) return } userIdentity := fmt.Sprintf("%d-%s", user.Id, user.Username) ts, err := createTokens(config.C.JWTAuth.SigningKey, userIdentity) ginx.Dangerous(err) ginx.Dangerous(createAuth(c.Request.Context(), userIdentity, ts)) ginx.NewRender(c).Data(gin.H{ "user": user, "access_token": ts.AccessToken, "refresh_token": ts.RefreshToken, }, nil) } ```  OIDC登录这里为啥我Get请求访问http://0.0.0.0:18000/api/auth/login 可以正常走登录流程，前端按钮调这个接口就跨域？