Feature Request: SSILastModified on

[aavmurphy]

Apache SSILastModified directive

Why?

The server doesn't send cache headers (last modified, etag, etc.) with SSI pages
- this allows them to be sent, so the SSI pages can be cached by the browser

 

[Jialu Zhang]

When having

SSILastModified on
XBitHack full

The setting "SSILastModified On" is a silent misconfiguration, because whether "SSILastModified" is on or not, it does not change any program behavior.
By tracking back to the source code of Apache, we can see the root cause of this misconfiguration is that the semantics enabled by "Xbithack Full" implicitly overwrite the semantics enabled by "SSILastModified On".

```
if (conf->lastmodified > 0) {
... {
ap_update_mtime(r, r->finfo.mtime);
ap_set_last_modified(r);}}

else if (((conf->xbithack == XBITHACK_FULL ||
(conf->xbithack == XBITHACK_UNSET &&
DEFAULT_XBITHACK == XBITHACK_FULL))
...)) {
ap_update_mtime(r, r->finfo.mtime);
ap_set_last_modified(r);
}
```