There is this section of the default .htaccess that Drupal ships with:
# Serve correct content types, and prevent mod_deflate double gzip.
RewriteRule \.css\.gz$ - [T=text/css,E=no-gzip:1]
RewriteRule \.js\.gz$ - [T=text/javascript,E=no-gzip:1]
I am not experienced with Drupal but in other projects with Nginx as the web server, I have never had a "double-gzip" issue.
How necessary is it, and what is the best nginx directive to accomplish this?
Note: I also posted this question to drupal.stackexchange.com, but I feel like it is not necessarily a Drupal specific issue, so I posted it here as well.