Hello, 

Our local policy demands the rejection of any query; we do this as follows:
if ($is_args) { return 301 /; }

The introduction of Thunderbird autoconfiguration demands an exception to
the above policy, because of 
"GET
/.well-known/autoconfig/mail/config-v1.1.xml?emailaddre=uname%40example.com".

The resulting rule would be 

if (($is_args) && ($args !~ emailaddress=.+%40[a-zA-Z0-9\.\-]+)) { return
301 /; }

The rule does not work, because nginx does not parse the AND condition. 

Of course, you cannot just remove $is_args, because $args is usually empty.


The alternative would be if ($args ~ emailaddress=.+%40[a-zA-Z0-9\.\-]+)) {
allow all; } else { return 301 /; }, 
but nginx does not parse if-then-else statements. 

Are we stuck in the cage?

Posted at Nginx Forum: 
https://forum.nginx.org/read.php?2,272758,272758#msg-272758

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