我试图在Nginx上提供静态文件（如.css .pdf .jpg），但我得到了403禁止错误，因此页面布局被破坏，文件无法访问。例如，如果我直接导航到该文件，我无法访问style.css文件。
/etc/nginx/sites-enabled/configfile

server {
        listen 80;
        server_name ipaddress here;

        location /static {
                alias /home/username/webapp/static;
        }

        location / {
                proxy_pass http://localhost:8000;
                include /etc/nginx/proxy_params;
                proxy_redirect off;
        }
}

主目录权限：

drwxr-xr-x   3 root root  4096 Jul 30 05:45 home

用户目录权限：

drwxr-x--- 6 username username 4096 Jul 30 06:17 username

webapp目录权限：

drwxrwxr-x 7 username username 4096 Jul 30 15:57 webapp

webapp/static/ directory权限：

drwxrwxr-x 2 username username 4096 Jul 30 06:04 static

webapp/static/style.css权限：

-rw-rw-r-- 1 username username  24672 Jul 30 06:04 style.css

文件/etc/nginx/nginx配置文件：

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
        # multi_accept on;
}

http {

        ##
        # Basic Settings
        ##

        sendfile on;
        tcp_nopush on;
        types_hash_max_size 2048;
        # server_tokens off;

        # server_names_hash_bucket_size 64;
        # server_name_in_redirect off;

        include /etc/nginx/mime.types;
        default_type application/octet-stream;

        ##
        # SSL Settings
        ##

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
        ssl_prefer_server_ciphers on;

        ##
        # Logging Settings
        ##

        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;

        ##
        # Gzip Settings
        ##

        gzip on;

        # gzip_vary on;
        # gzip_proxied any;
        # gzip_comp_level 6;
        # gzip_buffers 16 8k;
        # gzip_http_version 1.1;
        # gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

        ##
        # Virtual Host Configs
        ##

        include /etc/nginx/conf.d/*.conf;
        include /etc/nginx/sites-enabled/*;
}

#mail {
#       # See sample authentication script at:
#       # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
#       # auth_http localhost/auth.php;
#       # pop3_capabilities "TOP" "USER";
#       # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
#       server {
#               listen     localhost:110;
#               protocol   pop3;
#               proxy      on;
#       }
#
#       server {
#               listen     localhost:143;
#               protocol   imap;
#               proxy      on;
#       }
#}

我哪里做错了？