My Apache error.log file for emacswiki.org is full of the following:
In addition to that, 0.35% of my access.log entries (263/74905 in the current log file) seem to result in an internal server error – which is exactly what the Apache documentation says:
I checked the two big .htaccess files (one for cgi-bin, another one for htdocs) and all the RewriteRule entries have the [L] or [last] flag. [2]
How can I debug this? This is a shared hosting environment. I cannot use LogLevel. 
Apparently ordinary users are running into the same problem. DrewAdams is reporting that every now and then when he’s saving a page, he gets the internal server error. Saving involves a POST request with a redirecting reply – code 302. This is theoretically non-standard but widely used:
Want to take a look?