What can cause a double page request?

Question

I am currently investigating a double request problem on my site. Not all the time, but sometimes, a requested page will in fact load twice...which is not a problem really u

Answer 1

I have sat beside people whom I would swear knew better than this, and watch aghast as they double-clicked on every hyperlink in our app.

Didn't take long to figure out why they were experiencing double the page load time of everyone else...

Things like this certainly tend to give one pause when implementing pages that change the backend state. A lot of people put sequence numbers in hidden form elements so the backend can detect a double-submit.