Nginx反向代理的目录访问问题

从昨天就开始纠结了，在做实验的时候，遇到目录访问的问题，如下

前端nginx vhost的设置如下，代理访问后端的192.168.0.37

server
    {
            listen  80;
            server_name  www.proxy.com;
            index index.php index.html index.htm;

            location /test/ {
                proxy_next_upstream http_502 http_504 error timeout invalid_header;
                proxy_pass http://192.168.0.37;
                proxy_set_header Host 192.168.0.37;
                proxy_set_header X-Forwarded-For $remote_addr;
                proxy_redirect http://192.168.0.37/test/ /test/;
            }

             access_log /data/logs/weblog/proxy_server.access.log;
}

后端的192.168.0.37在根目录下是有test目录的，该目录下有个index文件，内容为“192.168.0.37 proxy test OK!”

现在的问题是如果在访问www.proxy.com/test/的时候是可以访问的，如下

[root@control_node ~]# curl -I http://www.proxy.com/test/
HTTP/1.1 200 OK
Server: nginx
Date: Wed, 24 Apr 2013 04:22:40 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 28
Connection: keep-alive
Last-Modified: Wed, 24 Apr 2013 03:09:13 GMT
Accept-Ranges: bytes

但是如果访问www.proxy.com/test的话就会301

[root@control_node ~]# curl -I http://www.proxy.com/test
HTTP/1.1 301 Moved Permanently
Server: nginx
Date: Wed, 24 Apr 2013 04:25:01 GMT
Content-Type: text/html
Content-Length: 178
Location: http://www.proxy.com/test/
Connection: keep-alive

我刚开始以为是我前端的proxy_redirect设置有问题，后来修改proxy_redirect多次，均无法达到要求，最后突发奇想，把前端的nginx设成了这样

server
    {
            listen  80;
            server_name  www.proxy.com;
            index index.php index.html index.htm;

            location /test {
                proxy_next_upstream http_502 http_504 error timeout invalid_header;
                proxy_pass http://192.168.0.37/test/;
                proxy_set_header Host 192.168.0.37;
                proxy_set_header X-Forwarded-For $remote_addr;
                #proxy_redirect http://192.168.0.37/test/ /test/;
            }

            location / {
                proxy_next_upstream http_502 http_504 error timeout invalid_header;
                proxy_pass http://192.168.0.37/;
                proxy_set_header Host 192.168.0.37;
                proxy_set_header X-Forwarded-For $remote_addr;
            }
             access_log /data/logs/weblog/proxy_server.access.log;

}

这样的话，访问www.proxy.com/test就没问题了

[root@control_node vhosts]# curl www.proxy.com/test
192.168.0.37 proxy test OK!