IE (and sometimes Safari) + SSL + File Uploads

[transdimentia]

Wonderful problems arise using IE in SSL mode when trying to do a post with a file upload in it. Usually terminating in a resource not available page. If you run into this problem you should turn keep-alives off in your webserver for such requests...

From mdchaney on USENET:

For lighttpd:

$HTTP["useragent"] =~ "^(.*MSIE.*)|(.*AppleWebKit.*)$" {
server.max-keep-alive-requests = 0
}

For apache:
BrowserMatch "MSIE 4\.0b2;" nokeepalive downgrade-1.0 force-response-1.0