auth_request called multiple times for same single request

[garyc]

Apologies, I posted this issue to the wrong list (php-fpm), the link is:

> https://forum.nginx.org/read.php?3,276451,276475#msg-276475

It has debug log file extracts that seem to suggest the location redirect to
a static error page is attempted but doesn't resolve.

Many thanks

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,276512,276512#msg-276512