问题描述：

本地运行项目打开swaager可以用，但是上传到服务器用nginx做反向代理的时候返回"error": "no response from server"，且网址有端口，swaager的请求url端口丢失，使用了默认80端口

问题原因：

因为在配置nginx反向代理的时候，没注意到配置代理的端口，导致端口丢失！

解决方案：

使用nginx端口映射的时候，proxy_set_header 配置不一样

server_name是域名的情况下：listen是80，且proxy_set_header Host $host;

server {
    server_name xxxx.xxxx.com;
    listen 80;

    location / {
        proxy_set_header   Host             $host;
        proxy_set_header   X-Real-IP        $remote_addr;
        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_http_version 1.1;
        proxy_read_timeout 21600s;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_pass http://127.0.0.1:8080;
    }

}

server_name是服务器ip的情况下：listen是映射的端口，且proxy_set_header Host $host:$server_port;

server {
    server_name 192.168.xxx.xxx;
    listen 8888;

    location / {
        proxy_set_header   Host             $host:$server_port;
        proxy_set_header   X-Real-IP        $remote_addr;
        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_http_version 1.1;
        proxy_read_timeout 21600s;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_pass http://127.0.0.1:8080;
    }

}