Nginx: httpoxy vulnerable

https://wunder.slack.com/archives/CAC0EPL1G/p1598441452006300?thread_ts=1598441403.006200&cid=CAC0EPL1G

I see:
```
# Mitigate HTTPoxy
# https://httpoxy.org/
fastcgi_param HTTP_PROXY '';
```
at the top level of the drupal conf.
Should it not be in `fastcgi.conf`?

At least I'm not able to create any `fastcgi_param` at the top level that is passed down to Php-fpm.