handling-errors.conf

# If there the upstream server errors, we want to with an error page.  
# Note the `location` directive here is performing a regex match.
location ~* (script1|script2|script3)\.php$ {
  proxy_pass http://192.168.0.1;
  
  # The `error_page` directive will return the document file
  # 50x.html depending on the upstream error.
  error_page 500 502 503 504 /50x.html;
}

# Sometimes if the upstream server returns an error we want to 
# go to a retry location.
location ~* (script4|script5|script6)\.php$ {
  proxy_pass http://upstream;
  error_page 500 502 503 504 403 404 @retry; 
}

# The retry location tries a different upstream and if that still
# errors, it returns an error page.
location @retry {
  proxy_pass http://upstream_backup;
  error_page 500 502 503 504 = 200 /50x.html;
}

# vi: ft=nginx