> In this case the ENV var "VHOST1_TOKEN" is corrrectly defined in the match case, but it is also *defined*, though null, for any/all other vhosts.
>
> How do I construct this conditional ENV var setting to ONLY set/defined the vars on host match?

You can add if_not_empty at the end of the particular fastcgi_param directive:

fastcgi_param VHOST1_TOKEN $this_token if_not_empty;

http://nginx.org/en/docs/http/ngx_http_fastcgi_module.html#fastcgi_param

rr

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