Viewing Content-Length header with Opera

Is it possible?

[mattglet]

Am I just missing something, or is there no way to view the Content-Length server header with Opera?

I'm trying to see if I'll run into issues with dial-up users by having too much info on a page. This information is the same that comes up with the Firefox Web Developer Toolbar under View Information, and the Size as listed in the page Properties in IE (right click on the page --> Properties).

[tedster]

The standard Opera interface doesn't expose the HTTP header data, but I assume you can accomplish this with a "User Javascript."

[opera.com...]

[mattglet]

The problem with this is that Opera doesn't support "document.fileSize".