Wednesday, April 23, 2008
Wednesday, April 16, 2008
Helping lost visitors? Sometimes a link provided by you may end up as 404 page or viewer might have typed wrong URL that doesn't lead correct page on your site. To help your visitors you can actually use .htaccess file (for Apache servers) to redirect all such links to a special page which will be more useful than plain "404 File Not found" error.
You can add this one line to .htaccess file (create this file if it doesn't exist)
ErrorDocument 404 /web404.html
On that page you can provide user with:
- Link to homepage
- Tell them to check the URL or Go Back
- Search functionality for your website will be very useful.
I have also added similar functionality for my wordpress blog. For setting up 404 Error page on wordpress follow this well compiled article: Creating an Error 404 Page
Interesting read: Creating User Friendly 404 Pages
Web Development Tools
Tuesday, April 15, 2008
You may have read about firefox's special about: pages like about:config, about:cache etc. Or you can go through Firefox about: pages to have an idea about them. There is one similar functionality in firefox which allows you to view page source of a page. You can type
view-source:http://www.google.com/this in location bar to view page source of google.com.
So i have made this Bookmarklet to view page source: View Source (So you can drag this to your bookmark toolbar to have quick access).
Firefox About Pages
Open webpages in sidebar
Monday, April 14, 2008
Two days back, my shoutbox was hacked :). I was not aware that people are actually visiting this, which I made long back to have similar thing for Ethos in june, 2005. After that i haven't updated the code and many things were left in between.
Luckily I checked the page just after the day this happened, So that way i actually got chance to update this orphaned code and made some fixes.
Solution : Idea is to filter meta characters such as (< , >, ' , " etc) Which will prevent browser from processing them as part of some script, they will be processed as plain text only.
So while doing in php you can do:
And to be on safer side we should also replace following characters:
replace ( with (
replace ) with )
replace & with &
replace ' with '
replace " with "
Or If you are not expecting user to input these characters then you can simply replace these with null string;
So now you can enjoy Shout Box until some new bug is found or its hacked again [;)]
SQL Attacks: Hacking (SQL injection)
Saturday, April 12, 2008
Yesterday I was working late night till 3AM, to update my extension 'My Del.icio.us Toolbar' which I made long back in October 2006. Reason was to make it work for newer versions of firefox. But then I added some new features too :
- I added a Explore feature which is similar to Stumble.
nsICookieManagerinterface to iterate over all of the cookies.
I also noticed that mozilla has redesigned the extension page. They have also added a nice statistics Dashboard for extension, provided graphical representation of number of downloads, active daily users etc. I was surprised to see that older version of My Del.icio.us has reached a total download of 11,200 (not that a big number but still surprising for me) and number of active user around 1000.
Try My Del.icio.us 2.0 and provide feedback.
Also Try: Del.icio.us SearchER