Delay calling do_log until just before emitting the response. This avoids
calling do_log before potentially handing control to the static-index
handler, which also calls do_log.
The mode printed under the -l option contains 11 characters,
interpreted as follows: the first character is
d if the entry is a directory;
a if the entry is an append-only file;
- if the entry is a plain file.
Therefore, handle them in automatically generated directory listings.
