如果我們的nginx配置了反向代理，如下：

location ^~ /wyq/ {
			proxy_pass    https://127.0.0.1:$wyq_port;
			proxy_redirect https://127.0.0.1:$wyq_port/ /;
			#proxy_redirect off;
			proxy_set_header Host $host;
			proxy_set_header X-Real-IP $remote_addr;
			proxy_set_header X-Forwarded-Proto https;
		}

現在假設$wyq_port的服務沒有啟動，我們瀏覽器請求時會返回 internal server error的錯誤，

如果我們想自定義錯誤頁面，改為如下配置即可：

location ^~ /wyq/ {
			proxy_pass    https://127.0.0.1:$wyq_port;
			proxy_redirect https://127.0.0.1:$wyq_port/ /;
			#proxy_redirect off;
			proxy_set_header Host $host;
			proxy_set_header X-Real-IP $remote_addr;
			proxy_set_header X-Forwarded-Proto https;    
                        proxy_intercept_errors on;
			error_page 500 502 503 504 = /error_500.html;
｝
location = /error_500.html{
			root /var/web;
}