How to resolve 500 Internal Server Error? [closed]

Answer 1

My step usually (in particular order):

1. open firebug and look up the particular ajax request from console. Then, see the parameter, header, and URL request. Examine each data to see what goes wrong. If it all seems OK
2. I will look at my server log (httpd-error.log on Apache) and check any particular error that came from that request.
3. Fix what is wrong based on all there checking.