We have nginx setup as a reverse proxy and on one of the backend servers
we have a Sharepoint website that we want to failover to a Wordpress
website hosted on another server if there's a problem with Sharepoint
website. I've googled and red through books etc but can't we an example
for this. I think i need "try_files" and some type of error code
checking but havent been able to figure it out. Could someone advice ?
Below is the type of thing that I think I am after.

Thanks for looking.
Keith

upstream primaryserver { server 10.1.1.1:80; }
upstream secondaryserver { server 10.1.1.2:80; }

server
{
listen 80;
server_name _;
server_name_in_redirect off;

location /
{
try_files @sharepoint @wordpress;
}
location @sharepoint
{
proxy_pass http://primaryserver;
proxy_set_header Host $host;
proxy_connect_timeout 3;
proxy_next_upstream error timeout;
}

location @wordpress
{
proxy_pass http://secondaryserver;
proxy_set_header Host $host;
proxy_connect_timeout 3;
proxy_next_upstream error timeout;
}

}

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