Created attachment 234106 [details] index.html start here For your http server. You need to examine the server log files to verify the bug.
1.7.3 is a really old release... you should upgrade, that version has known security problems. anyway, this bug has been fixed in Gecko 1.8 (SeaMonkey 1.0, Firefox 1.5, etc) *** This bug has been marked as a duplicate of 268844 ***
also, your bug report is missing steps to reproduce... it's unclear to me how the testcase here works/what it is supposed to show.