ODOO静默打印模块使用说明书

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ODOO生产中，用户打印的逻辑是先下载，再打印，操作起来肯定是很繁琐，较好的方式是直接打印，但直接打印又有两种情况，一种是弹出浏览器的对话框，一种是配置好，点击时就直接到打印机。显然，直接打印到打印机是最好的方案。方案加构图如下：

具本实现呢，目前市面上也有两种方案

1、使用printernode一类的第三方服务，如app市场上的模块，这个方式的好处是成熟稳定，坏处是，如果用得多，你还得交个流量费。自己用没啥，给客户用就有点尴尬。

此种方案依赖于第三方服务，所以存在第三方服务费用，也是情理中，只是app市场上调用一个第三方的应用来做这个事总感觉有点奇怪，只能说在没有选择的情况下是个很好的选择。

2、自行实现中转服务。架构图如下

客户端效果:

注意，这里如果是http使用的是80端口，如是https则使用的是443端口，同时，如果通过nginx代理，则nginx里边配置/websocket的转发

upstream erpserver {
	server 127.0.0.1:8000;
}

upstream erpserver_longpolling {
	server 127.0.0.1:8003;
}

upstream erpserver_websocket {
	server 127.0.0.1:8000;
}

server {
	listen 80;
	server_name www.xxxx.com;
	return 301 https://www.xxx.com$request_uri;
}

server {
	listen 443 ssl;
	server_name www.xxxx.com;
	access_log /var/log/nginx/ylhc_access.log;
	error_log /var/log/nginx/ylhc_error.log;
	
	# Client settings for better performance
	client_max_body_size 200m;
	client_body_timeout 60s;
	client_header_timeout 60s;
	keepalive_timeout 65s;
	send_timeout 60s;
   
       	# SSL
	ssl_certificate /etc/letsencrypt/live/www.xxxx.com/fullchain.pem;
	ssl_certificate_key /etc/letsencrypt/live/www.xxxx.com/privkey.pem;
	ssl_trusted_certificate /etc/letsencrypt/live/www.xxxxx.com/chain.pem;

	# Proxy settings
	proxy_read_timeout 720s;
	proxy_connect_timeout 720s;
	proxy_send_timeout 720s; 
	proxy_set_header X-Forwarded-Host $host;
	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
	proxy_set_header X-Forwarded-Proto $scheme;
	proxy_set_header X-Real-IP $remote_addr;
	
	# Keep-alive settings for long connections
	proxy_http_version 1.1;
	proxy_set_header Connection "";
	proxy_buffering off;
	proxy_request_buffering off;

	# Request for root domain
	location / {
	       proxy_redirect off;
	       proxy_pass http://erpserver;
       }
       
       # WebSocket support for longpolling (WSS over HTTPS)
       location /longpolling {
	       proxy_pass http://erpserver_longpolling;
	       proxy_http_version 1.1;
	       proxy_set_header Upgrade $http_upgrade;
	       proxy_set_header Connection "upgrade";
	       proxy_set_header Host $host;
	       proxy_set_header X-Forwarded-Host $host;
	       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
	       proxy_set_header X-Forwarded-Proto $scheme;
	       proxy_set_header X-Real-IP $remote_addr;
	       proxy_cache_bypass $http_upgrade;
	       proxy_read_timeout 3600s;
	       proxy_send_timeout 3600s;
	       proxy_connect_timeout 3600s;
	       
	       # WebSocket specific optimizations
	       proxy_buffering off;
	       proxy_request_buffering off;
       }
       
       # WebSocket support for /websocket endpoint (WSS over HTTPS)
       location /websocket {
	       proxy_pass http://erpserver_websocket;
	       proxy_http_version 1.1;
	       proxy_set_header Upgrade $http_upgrade;
	       proxy_set_header Connection "upgrade";
	       proxy_set_header Host $host;
	       proxy_set_header X-Forwarded-Host $host;
	       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
	       proxy_set_header X-Forwarded-Proto $scheme;
	       proxy_set_header X-Real-IP $remote_addr;
	       proxy_cache_bypass $http_upgrade;
	       proxy_read_timeout 3600s;
	       proxy_send_timeout 3600s;
	       proxy_connect_timeout 3600s;
	       
	       # WebSocket specific optimizations
	       proxy_buffering off;
	       proxy_request_buffering off;
       }
       
       # Cache static files
       location ~* /web/static/ {
	       proxy_cache_valid 200 90m;
	       proxy_buffering on;
	       expires 864000;
	       proxy_pass http://erpserver;
       }
       
       
       # Gzip Compression
       gzip_types text/css text/less text/plain text/xml application/xml application/json application/javascript;
       gzip on;
}