location /
{
/some/main/root;
}

location /blah
{
/some/other/root;
}

will result in 404 when accessing www.domain.com/blah123.html even
though there's /some/main/root/blah123.html (instead it tries
/some/other/root/blah123.html)

OTOH, using

location /blah/ { ... }

will result in 404 when accessing domain.com/blah even though there's
an index in the location. (probably because it doesn't match)

of course this works as I wanted it to.

location ~ /blah($|/) { ... }

*using try_files $uri $uri/ @fallback doesn't help.

is this intended?

--
O< ascii ribbon campaign - stop html mail - www.asciiribbon.org