It doesn't want to reload them.
On an SSI document, my Apache server sends just these headers:
HTTP/1.1 200 OK
Date: Thu, 15 Mar 2001 20:03:44 GMT
Server: Apache/1.3.12 (Unix)
Connection: close
Content-Type: text/html
There's no Last-Modified or Content-Length header. Reload does nothing. In
fact, mozilla makes no network connection at all. Shift-reload does work.
This happens either with a direct connection or via a proxy.
--
Jupiter
2001-03-15 20:13:17.456 UTC (JD 2451984.342563)
X = 1.254321855, Y = 4.519328185, Z = 1.906598151 (au)
X' = -0.007404093, Y' = 0.001983113, Z' = 0.001030320 (au/d)