nginx反代两个不同域名,域名的IP不一样. 我这样配置对吗?

upstream

myhost1 {
server 192.168.1.1:80 weight=1 max_fails=2 fail_timeout=30s;
}

myhost2 {
server 192.168.1.2:80 weight=1 max_fails=2 fail_timeout=30s;
}

#####

server {
listen 80;
server_name www.xxx.com;
location /
{
proxy_pass http://myhost1;
proxy_cache_key $host$uri$is_args$args;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_cache_valid 200 304 12h;
expires 2d;
}

location ~ /purge(/.*)
{
allow 127.0.0.1;
deny all;
proxy_cache_purge cache_one $host$1$is_args$args;
}

location ~ .*\.(php|jsp|cgi|asp|aspx|flv|swf|xml)?$
{
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_pass http://myhost1;
}
access_log off;
}

server {
listen 80;
server_name www.yyy.com;
location /
{
proxy_pass http://myhost2;
proxy_cache_key $host$uri$is_args$args;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_cache_valid 200 304 12h;
expires 2d;
}

location ~ /purge(/.*)
{
allow 127.0.0.1;
deny all;
proxy_cache_purge cache_one $host$1$is_args$args;
}

location ~ .*\.(php|jsp|cgi|asp|aspx|flv|swf|xml)?$
{
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_pass http://myhost2;
}
access_log off;
}