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Brad Fitzpatrick

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Firefox 1.0/1.1 bug? [May. 8th, 2005|05:28 am]
Brad Fitzpatrick

Both Firefox 1.0.3 and the almost-1.1 nightly builds have an interesting feature/bug.

You can dynamically load JavaScript (from any URL) from Javascript and Firefox won't send along the HTTP Referer (sic) header.

Test with, say:
function js_include (uri) {
  var se = document.createElement("script");
  se.src = uri;


Now, imagine if every LJ page contained that. Every LJ user could be DoS'ing some other site, with no Referer header saying we requested it.

Dear Lazyweb, tell me what other browsers do/send. I'd go upstairs and use IE on Dina's laptop but I'm too lazy to install ethereal on it. Plus I should go back to bed.

Update: Couldn't sleep. Results:

Firefox/1.0.2 (Debian package 1.0.2-2): No Referer
Firefox/1.0.1 (Windows): Referer
IE 6: Referer

So is this a regression from 1.0.1 to 1.0.2, or is it a Linux/Windows thing?

Firefox/1.0.1 (Linux, not Debian): No Referer

Looking like a Linux thing.

[User Picture]From: boggyb
2005-05-08 01:43 pm (UTC)
I know, it's just something to bear in mind. Personally I turn off the referer eating, but the default is to eat them. I remember running into problems with that when a site started running referer checking, and wouldn't let you through *unless* it saw a referer header that it liked. A missing referer header was rejected. Very annoying it was, until someone fixed it.
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