server h2jammy.yushei.net:43887 weight=4; server h2jammy-01.yushei.net:43889 weight=3; server h2jammy-02.yushei.net:43887 weight=2; server h2jammy-03.yushei.net:43889 weight=1;

Nginx will distribute the traffic according to the specified weights. In this case: h2jammy.yushei.net:43887 will handle 40% of the traffic. h2jammy-01.yushei.net:43889 will handle 30% of the traffic. h2jammy-02.yushei.net:43887 will handle 20% of the traffic. h2jammy-03.yushei.net:43889 will handle 10% of the traffic.