Enable favicon in haproxy stats page

frontend stats
        bind :8080
        use_backend be_stats unless { path /favicon.ico }
        errorfile 503 /etc/haproxy/errors/haproxy-favicon.ico
backend be_stats
        stats enable
        stats uri /

Note: You have to embed the http headers into the .ico file, you can do that via the following 2 commands

echo -e "HTTP/1.0 200 OK\r\nContent-Type: image/x-icon\r\n\r\n" > /etc/haproxy/errors/haproxy-favicon.ico
curl http://www.haproxy.org/favicon.ico >> /etc/haproxy/errors/haproxy-favicon.ico

some browsers might want more headers, here are some more 😄

HTTP/1.0 200 OK^M
Accept-Ranges: bytes^M
Content-Length: 1406^M
Content-Type: image/x-icon^M
^M