Echo is in the nginx configuration but what happens if there is no output?

[nailsoul]

location / {
echo "haha";
proxy_pass http://www.xxxxx.net;
proxy_redirect off;
proxy_set_header Host www.xxxxx.net;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}

Access. log and error.log and HTTP response are not available. What should haha do to display?

[nailsoul]

nginx version is 1.140 echo-nginx-module version is 0.61 rc1