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Security in CGI program

liulian asked
Last Modified: 2010-04-04
I'd like use a cgi to let my user get
their private informations from web, but
after the first user login and viewing
his things, next user can use "back"
button of IE to go back and get the
private data of the first person.

How can I add protection of my web?
Watch Question

A good way is create a link in your HTML which closes the window. The user can click it after use your page.

You can use this:
<a href="" onclick="parent.close()">Exit</a>


But my program works on a touching screen. User can't close the IE!


Some web has "Logout" , if I  click on it then use the "back" button, the web site redirect to login page. How do they do like this?

you should use these instead somewhere in you <head> tag ,these stop the browsers from loading pages from the cache:

<meta HTTP-EQUIV="pragma" Content="nocache">
<meta HTTP-EQUIV="cache-control" Content="no-cache">
<meta HTTP-EQUIV="expires" content="1 Jan 99">
Regards Barry



hi inthe:
Thank you, but it doesn't work.


hi inthe:
Thank you, but it doesn't work.
Can you give me more comments?

mmm.. i have to test that sometime i was quite sure it should work.i have definetly used it before in homepage stuff for clearing a form or something.


Hi, inthe:
Can you can me a web page in the internet has this function?
Thank you.

 it dont work but i find a way that does try this:

<A HREF="javascript:location.replace('nextpage.html')">Advance</A>

The location object's replace() method overwrites the current history entry with the specified URL. It removes the current history entry before the next URL is loaded. Removing the item from the history list also prevents users from seeing the page again by clicking on the Back button later.
This technique is very useful for online games and multi-page forms, where you want prevent the user from returning to the previous page. Furthermore, the location.replace() method is supported by all browsers except Navigator 2.0x.


Ok...I'll try it later..
Thank you
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