The url to get the form and post the form are the same. 
eg. "/accounts/{userEntityId}/xxx/new"
 Advantage: when a user submit a form with error the post url will be
displayed in the url,
 if the session expires, and post url used to post the form will be
displayed in the url,
 if post and get url are the same then when the user login and refresh
the page, 
 the get method will be called. or the page will crash.