The number 1 unacceptable blunder of website deployment is people not turning off the display of errors. I just came across one two minutes ago. People, when you put your website live make sure others dont see any kind of errors that no one but the programmer should be using during development. I’m not talking about I.E. crapping out on the user and I’m not even talking about 404 errors(no to say that is acceptable – I know I’m guilty of this one).
Why is it unacceptable? Number 1 reason is that you will lose credibility of your site. Second is you are exposing what’s under the hood – why this one is bad is a whole other story.
This mostly happens with sites running on php. Make sure “display_errors” is set to “OFF” in the php config file. What is even more surprising to me is that some of the sites that have errors, and I’m not just talking about php sites, are actually well reputed sites! I’m not going to mention any names here, but they are there and if you’ve ever used the Internet, I’m sure you’ve come across a few already.