在docker内搭建nginx gogs，两者在同一个docker网络内。
测试情况：

1. gogs可以通过IP+端口方式访问
2. nginx可以启动，并且可以代理另一个html页面，并通过二级域名访问

问题：
无法通过二级域名访问gogs。报错:502 Bad Gateway nginx/1.15.6
代码中的域名替换成了#域名

error.log

2018/11/15 06:53:21 [error] 5#5: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 14.153.77.141, server: #域名, request: "GET / HTTP/2.0", upstream: "http://172.18.0.3:10080/", host: "#域名"

nginx.config

user nginx;
worker_processes auto;
error_log /etc/nginx/err/error.log;

events {
    worker_connections 1024;
}

http {
    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             mime.types;
    default_type        application/octet-stream;
    include /etc/nginx/conf.d/*.conf;

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  _;

        location / {
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }
}

default.conf

server {  
        listen 80;  
        server_name #正常域名;
        return 301 https://$server_name$request_uri;  
}
server{
        listen 443 ssl http2;
        server_name #正常域名;
        ssl_certificate   #正常秘钥;
        ssl_certificate_key  #正常秘钥;
        ssl_session_timeout 10m;
        ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:d!MD5:!RC4:!DHE;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        location / {
                proxy_pass http://gogs:10080/;
                proxy_redirect default;
       }
       access_log  /etc/nginx/err/gogs.log;
}

gogs的app.ini

[server]
DOMAIN           = http://127.0.0.1
HTTP_PORT        = 3000
ROOT_URL         = http://127.0.0.1:10080/
DISABLE_SSH      = false
SSH_PORT         = 10022
START_SSH_SERVER = true
OFFLINE_MODE     = false
ENABLE_GZIP         = true