Nginx cakephp重写规则突然导致404，它之前是工作的

我用nginx设置了cakephp，在我设置nginx和url重写之前工作得很好，这样的url形式:mywebsite.com/cake_project/controller/action工作得很好。然后我将文件夹cake_project的名称更改为web，并更新了nginx配置文件，现在当我转到mywebsite.com/web时，cakephp工作，但如果我转到mywebsite.com/web/controller或mywebsite.com/web/controller/action，它会给出404。

(我的操作系统是Ubuntu, CakePHP版本是2.3.9)

这是我当前的nginx配置，抱歉我没有备份我的旧nginx配置:(这可能会帮助我)。

##
# You should look at the following URL's in order to grasp a solid understanding
# of Nginx configuration files in order to fully unleash the power of Nginx.
# http://wiki.nginx.org/Pitfalls
# http://wiki.nginx.org/QuickStart
# http://wiki.nginx.org/Configuration
#
# Generally, you will want to move this file somewhere, and start with a clean
# file but keep this around for reference. Or just disable in sites-enabled.
#
# Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.
##
server {
    listen 80;
    listen [::]:80;
    server_name mywebsite.com;
    return 301 https://$server_name$request_uri;
}
server {
        listen 443 default_server;
        listen [::]:443 default_server ipv6only=on;
        root /usr/share/nginx/html;
        index index.php index.html index.htm;
        ssl on;
        ssl_certificate path_to_ssl_certificate;
        ssl_certificate_key path_to_ssl_key;
        ssl_session_timeout 5m;
        ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
        ssl_ciphers "HIGH:!aNULL:!MD5 or HIGH:!aNULL:!MD5:!3DES";
        ssl_prefer_server_ciphers on;
        # Make site accessible from http://localhost/
        server_name localhost;
        add_header Strict-Transport-Security "max-age=31536000; includeSubdomains";
        location /web {
            alias /usr/share/nginx/html/web/app/webroot;
            try_files $uri $uri/ /web/webroot/index.php;
        }
        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                try_files $uri $uri/ =404;
                # Uncomment to enable naxsi on this location
                # include /etc/nginx/naxsi.rules
        }
        error_page 404 /404.html;
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
                root /usr/share/nginx/html;
        }
        location ~ '.php$ {
                try_files $uri =404;
                fastcgi_split_path_info ^(.+'.php)(/.+)$;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                include fastcgi_params;
        }
        # Only for nginx-naxsi used with nginx-naxsi-ui : process denied requests
        #location /RequestDenied {
        #       proxy_pass http://127.0.0.1:8080;
        #}
        #error_page 404 /404.html;
        # redirect server error pages to the static page /50x.html
        #
        #error_page 500 502 503 504 /50x.html;
        #location = /50x.html {
        #       root /usr/share/nginx/html;
        #}
        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        location ~ '.php$ {
                fastcgi_split_path_info ^(.+'.php)(/.+)$;
        #       # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
        #
        #       # With php5-cgi alone:
        #       fastcgi_pass 127.0.0.1:9000;
        #       # With php5-fpm:
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                include fastcgi_params;
        }
        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /'.ht {
        #       deny all;
        #}
}

# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
#       listen 8000;
#       listen somename:8080;
#       server_name somename alias another.alias;
#       root html;
#       index index.html index.htm;
#
#       location / {
#               try_files $uri $uri/ =404;
#       }
#}

有谁能看出我做错了什么吗?