How to fix the error “ Host not found in upstream”?

If you wish to fix the host not found in upstream a resolver directive can be added to the configuration to avoid future crashes. The following code will simplify:

Server {
Listen 80;
Server_name test.com;
Location / {
Resolver 8.8.8.8
Proxy_pass
Proxy_redirect  off;

However, using a public DNS is risky since the DNS requests can be spoofed. Hence use a safe DNS server.

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