Hello, 

I am using this as an example that CAS flow does not support BACK button. 
That is not the real problem I am facing. 

We have added a couple more screens in the login flow, such as requiring 
user to change password if it expires, setting up user when login to CAS 
for the first time.  Our BACK button is broken right now. Spring Web Flow 
should support it by default.  

I understand the double-submit problem, that is why there is 
POST-REDIRECT-GET pattern.

What is in CAS that it overrides Spring Web Flow default behavior and does 
not support Back button, and I will have to implement "Back" myself on 
every screen individually?

Yan

On Wednesday, April 11, 2018 at 4:59:06 AM UTC-4, Uxío Prego wrote:
>
> Yeah take control of the browser back button and send the user to wherever 
> you find appropriate: https://stackoverflow.com/questions/25806608/.
>
> Regards,
>
> Uxío Prego
>
>              
>
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> 2018-04-10 15:59 GMT+00:00 Ray Bon <[email protected] <javascript:>>:
>
>> Yan,
>>
>> Accept User Agreement is shown after Login Screen form is POSTed. You can 
>> not go back to it from Success Page because that would require resubmitting 
>> the login form.
>> If you really want to be able to go back to Accept User Agreement, you 
>> could have a link on Success Page or perform some redirection/javascript 
>> reloading of Accept User Agreement. 
>>
>> Ray
>>
>> On Mon, 2018-04-09 at 10:50 -0700, Yan Zhou wrote:
>>
>> Hello,  
>>
>> I built CAS 4.1.9 overlay webapp. In order to test transition among the 
>> UI screens using browser Back button, I enabled AUP flow just so I can have 
>> a couple screens to navigate with. 
>>
>> Login Screen -> Accept User Agreement -> Success Page. 
>>
>> When I am in the 2nd screen, I can use Browser Back button to go back to 
>> the 1st screen,  but when I am at the last screen (success page), hitting 
>> browser BACK button results in an "expired page" or a cache-miss, 
>> basically, browser cannot find the page in the cache. 
>>
>> Any suggestion?
>>
>> Thx!
>>
>> -- 
>> Ray Bon
>> Programmer analyst
>> Development Services, University Systems
>> 2507218831 | CLE 019 | [email protected] <javascript:>
>>
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