灰度的初级阶段

最近开发提出了服务端灰度的需求，其实就是他们什么都不要做

很不建议这么搞，版本的兼容应在服务内部解决，这样干也是迫不得已

nginx脚本

    server {
        listen 3000 default_server;
        listen 3001 default_server;
        listen 3002 default_server;
        listen 3003 default_server;
        listen 10100 default_server;
        listen 13006 default_server;
                server_name _;
                server_name_in_redirect off;

gzip on;
gzip_min_length  1100;
gzip_buffers     4 8k;
gzip_comp_level 5;

gzip_http_version 1.0;
gzip_disable "MSIE [1-6].";
gzip_types text/plain application/x-javascript text/css text/javascript application/javascript;

location /
{
        resolver 114.114.114.114;
        set $target '';
        access_by_lua_block {
                        local host = ngx.var.host
                        local key = ngx.var.http_dtapi_v
                        if key == nil then
                                        key = "p"
                        end
                        local server = key.."_"..host
                        print("server: ", server)
                        ngx.log(ngx.ERR, "backendserver: ", server)
                        ngx.log(ngx.ERR, "server.port", ngx.var.server_port)
                        ngx.var.target = server
        }
        proxy_pass http://$target:$server_port;
}
}