How can you verify that the Nginx configuration correctly directs traffic to the specified upstream servers?

To ensure that the Nginx configuration correctly directs traffic to upstream servers, you can:

• Check the configuration syntax with the command nginx -t.
• Restart or reload Nginx to apply changes.
• Use Nginx access and error logs to track requests and potential issues.
• Make test HTTP requests (for example, using curl) to Nginx and verify that responses come from the correct upstream servers.
• Enable the status parameter in the upstream configuration or use special headers to identify which server is responding.

Example test with curl:

curl -v http://your-nginx-server/path

The response can show which backend handled the request if the appropriate headers are configured.