[Auth UI] Not able to back to email / phone number input page after inputting an invalid verification code

[keithtkl]

User still stays on the verification code page after inputted an invalid code and pressed back button on the page

• Skygear Server Date/Version: Not sure
• Application Platform: Tested on Rees

Expected Results

Press on the back button should open the phone / email input page so that user can make the change

Actual Results

Pressing on the back button still stays on the verification code input page

Steps to reproduce

1. Open signup / login page, and use email / phone number
2. On verification code page, fill in an invalid code and click Next
3. Press back button on the page after seeing the error message
4. Still stay on the verification page

[louischan-oursky]

This problem is about the interaction between Post/Redirect/Get pattern and the browser history.

[louischan-oursky]

duplicate of #1481