Preventing args other than list

[Valery Kholodkov]

----- Markus Jelsma <markus.jelsma at openindex.io> wrote:
> 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?

The only solution I know that doesn't require low level coding is build in perl.

-- 
Regards,
Valery Kholodkov