Problem on configuration of http in router

I am configuring ip http on Router 3640. I configured #ip http server and username, password on the router. But when i login to the router through web browser, i got below picture 1 without requesting username and password instead of picture 2. why is it happening ? how to solve it? Thanks

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EESkyAuthor Commented:
After i typed "ip http authentication local" and then i tried to login to the router, i got below picture. But i could never login to the router again.
what i used of command is :

ip http server
username cisco privilege 15 password cisco
ip http authentication local
Could you press reset button on your router for 30 seconds
and try it again ?

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Let username as blank(no input)
and type password as "password"
that is default password after reset for cisco

and then reset all username and password afer
login inot admin page
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EESkyAuthor Commented:
Thank you for your reply. If the username is blank with password "password" it does not work in this router, but after rebooting, it finally works. it looks like the router's cache needs to be cleared. So how to do that without rebooting? What command can be used to clear it ?
it should be 'admin' for password and don't input login just let it blank

Be reminded, press the reset button at the back of the cisco router
EESkyAuthor Commented:
i just tried it, but it cannot work in this router. so what command can clear cache of the router without rebooting router ?

why did i get response with colorless window (see above third picture) instead of color one( second picture above) when i want to login to the router ?
did you get into admin page after reset so that you can clear up everything
or reset everything

Probably you can find those  adminstrator password for model of router from
google search with your router model number

For my router, I used "admin" for password after resest that I can access
into admin page and reset everything
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