Gaivo Jabber server is back, which means my Jabber account works again.

Sometimes you get this feeling of really mastering a technology. As if nothing can surprise you and you’ve seen it all. If you’re lucky, you’ll get a message like this before you become too cocky:

Error: The callee (server [not server application]) is not available and disappeared; all connections are invalid. The call did not execute.

Do you know what it means? Neither did I, but somebody else did :

It occurs in the context of pages using javascript to generate page
content and communicate between windows, one of which windows is closed.

Possibly
* page A pops up page B in the link and page B wants to communicate with
page A, but page A has been closed (possibly by you or a popup killer?), or
* Internet Explorer has become totally confused and it will work in
another browser, or
* poor page design.

Or in my case forgetting Javascript passes references when assigning objects which become null, if referenced object was stored in now defunct window. The problematic browser in question was of course Internet Explorer.

A Marela member notified us, that file upload doesn’t work in Opera Mini . It’s true, because Opera Mini doesn’t support file uploads which you can easily check by visiting two demo pages with valid XHTML. You shouldn’t see a file input element on either of them.

I believe (but as an outsider obviously can’t prove) it lacks upload support for security reasons. Every web request handled by Opera Mini gets transported over a proxy, which fetches the page in questions and translates it in a compressed format suitable for viewing on small screen devices. This means that file uploads would be sent to proxy as well which depending on what is sent can be seen as a security violation.

Of course it does allow logging in websites, a potentially unsafe action, which puts my speculation on shaky grounds. But the true point of this article still stands. Opera Mini doesn’t support file uploads.