WebSocket 介绍
WebSocket是目前比较成熟的技术了,大部分现在的浏览器都支持WebSocket,比如Firefox,IE,Chrome,Safari,Opera,并且越来越多的服务器框架现在也同样支持WebSocket。WebSocket 和HTTP虽然是不同协议,但是两者“握手”方式兼容。通过HTTP升级机制,使用HTTP的Upgrade和Connection协议头的方式可以将连接从HTTP升级为WebSocket。NGINX从1.3版本开始支持WebSocket,其可以作为一个反向代理和为WebSocket程序做负载均衡。即将Upgrade: websocket和Connection: Upgrade必须设置一致
GET /app/websocket/ HTTP/1.1
Host: localhost
Upgrade: websocket
Connection: U服务器托管pgrade
Sec-WebSocket-Key: dddskkkdsjss
Origin: http://localhost
Sec-WebSocket-Version: 13
一个典型的Websocket握手请求如下:
客户端请求:
GET / HTTP/1.1
Upgrade: websocket
Connection: Upgrade
Host: example.com
Origin: http://example.com
Sec-WebSocket-Key: sN9cRrP/n9NdMgdcy2VJFQ==
Sec-WebSocket-Version: 13
服务器回应:
HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: fFBooB7FAkLlXgRSz0BT3v4hq5s=
Sec-WebSocket-Location: ws://example.com/
二.Nginx开启websocket代理功能的配置如下
编辑vhosts下虚拟主机的配置文件,在location匹配配置中添加如下内容:
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
具体配置实例如下
server {
listen 80;
server_name 域名;
proxy_http_version 1.1;
#启用支持websocket连接的配置
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
upstream myweb_backend {
hash $remote_addr consistent;
server 10.10.12.108:9001;
server 10.10.12.109:9001;
}
location / {
proxy_redirect off;
proxy_set_header Host $http_host;
proxy_set_header x-real-ip $remote_addr;
proxy_set_he服务器托管ader x-scheme $scheme;
proxy_pass http://myweb_backend;
proxy_connect_timeout 60; #配置规避webSocket连接中断
proxy_read_timeout 600; #配置规避webSocket连接中断
proxy_send_timeout 600; #配置规避webSocket连接中断
}
}
proxy_set_header Upgrade $http_upgrade和proxy_set_header Connection “upgrade”也可以配置到location里面 ,配置如下
server {
listen 80;
server_name 域名;
upstream myweb_backend {
hash $remote_addr consistent;
server 10.10.12.108:9001;
server 10.10.12.109:9001;
}
location / {
proxy_redirect off;
proxy_set_header Host $http_host;
proxy_set_header x-real-ip $remote_addr;
proxy_set_header x-scheme $scheme;
proxy_pass http://myweb_backend;
proxy_connect_timeout 60; #配置规避webSocket连接中断
proxy_read_timeout 600; #配置规避webSocket连接中断
proxy_send_timeout 600;#配置规避webSocket连接中断
proxy_http_version 1.1;
#启用支持websocket连接的配置
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}
}
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Java 异常类 首先让我们简单了解或重新学习下 Java 的异常机制。 Java 内部的异常类 Throwable 包括了 Exception 和 Error 两大类,所有的异常类都是 Object 对象。 Error 是不可捕捉的异常,通俗的说就是由于 J…