How to make Google Cloud CDN serve gzip compressed content.

Preface

Google Cloud CDN is not like Cloudflare, which can make you serve gzip compressed content on the proxy servers with just one click.

TL;DR

Add these two lines below into /etc/nginx/default.conf

gzip_proxied     any;
gzip_vary        on;

And restart the Nginx server.

Explanation

According to Google Cloud CDN troubleshooting:

The first line enables compression even for requests forwarded by a proxy like HTTP(S) load balancing.

The second line adds a Vary: Accept-Encoding header to responses. Vary: Accept-Encoding notifies caching proxies such as Cloud CDN that they should maintain separate cache entries for compressed and non-compressed variants of compressible resources.

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