Using nginx as a reverse proxy

Note: If you are using the EU cloud then use eu instead of us in all domains (e.g. us.i.posthog.com -> eu.i.posthog.com)

You can use nginx as a reverse proxy. To do this, first create a Dockerfile to build a nginx container:

dockerfile

FROM nginx:alpine
COPY nginx.conf /etc/nginx/nginx.conf

Next, create the nginx.conf file with the reverse proxy configuration. The following checks the Referer header to ensure the request is coming from your domain (set as hogbook.com in this case), then proxies the request to PostHog Cloud US. Change us to eu to proxy to our EU Cloud.

nginx.conf

# The main context
events {
    worker_connections 1024;
}

http {
    server {
        listen 8080;  # Set the port to 8080

        server_name _;  # Accept requests for any domain

        # Check Referer header
        # Change hogbook to your domain as needed to ensure requests only come from your domain
        set $valid_referer 0;
        if ($http_referer ~* "^https?://(localhost|([a-zA-Z0-9-]+)\.hogbook\.com)") {
            set $valid_referer 1;
        }

        if ($valid_referer = 0) {
            return 403;  # Return forbidden if the Referer header is invalid
        }

        location /static/ {
            proxy_pass https://us-assets.i.posthog.com/static/;
            proxy_set_header Host us-assets.i.posthog.com;
        }

        location / {
            proxy_pass https://us.i.posthog.com/;
            proxy_set_header Host us.i.posthog.com;
        }
    }
}

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Ian Vanagas