Preventing args other than list

[Markus Jelsma]

Hi list,

We're having an upstream server that can accept many different parameters. Most 
query string parameters can be predefined in the backend itself but some cannot 
because they are unpredictable.

We'd like to configure our proxy as to only allow a set of parameters that we 
want to define in Nginx. Configuring the list in a map seems easy, but comparing 
it to the actual query parameters seems hard.

I know how i can test on availability of parameters by using $args_PARAMETER 
and the if directive. But just as in the backend, we wan't to inverse the 
list.  We need to define what IS allowed, not wat ISN'T allowed.

Any suggestions on how to procede?

Cheers,

-- 
Markus Jelsma - CTO - Openindex
http://www.linkedin.com/in/markus17
050-8536600 / 06-50258350