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and it isn't quite clear how to do that

I think it's driven by

fastcgi

parameter, if it's undef, file shouldn't be created

I am doing fastcgi, I just don't want the default file, I want to set the fastcgi_param hash to pass them in

the code uses define function, which is, imho, produces ambiguous code. define your new file before nginx class is included in the code

That should work