retrieve the url where the user should be redirected to start the openid authentication process concode_field_sep PlaceHolder placeHolder concode_field_sep F.Promise<UserInfo> verifiedId concode_elem_sep OpenIdClient client
F . Promise < String > function ( String arg0 , String arg1 , Map < String , String > arg2 , Map < String , String > arg3 ) { return client ( ) . redirectURL ( arg0 , arg1 , arg2 , arg3 ) ; }