什么情况下nginx会发生端口丢失

# the 90 port 2 server { 3 listen 90; 4 server_name zxy1994.cn; 5 proxy_set_header X-Forwarded-Host $host; 6 proxy_set_header X-Forwarded-Server $host; 7 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 8 proxy_set_header Host $host:$server_port; #这里是重点,这样配置才不会丢失端口 9 location / { 10 proxy_pass http://127.0.0.1:9001; 11 } 12 location = /50x.html { 13 root html; 14 } 15 16 } 二、产生原因 nginx没有正确的把端口信息传送到后端，没能正确的配置nginx，下面这行是关键 proxy_set_header Host $host:$server_port; 这一行是关键。