Emphasized on what the "updating" parameter of the "fastcgi_cache_use_stale" directive achieves. Referenced the "fastcgi_cache_lock" directive from there, which has similar effect when populating a new cache element.

<!DOCTYPE versions SYSTEM "../dtd/versions.dtd">

<versions>
<development> 1.2.0 </development>
<stable> 1.2.0 </stable>
<legacy_stable> 1.0.15 </legacy_stable>
</versions>