01_default.conf

##
# Randomly choose the *.html (e.g. 00_xx.html) to be used as error page.
# If the target directory only contains a single HTML file,
# this file will be always the unique error page (A fixed error page).
#
# The error page (*.html) will be picked from the child directories of /etc/nginx/epage.d/
# e.g. /404/, /40x/, /50x/.
##

# Obmit the `[=[response]]` syntax to keep the error response code for clients.
## http://nginx.org/en/docs/http/ngx_http_core_module.html#error_page
error_page 404              /404/;
error_page 400 401 403      /40x/;
error_page 500 502 503 504  /50x/;

location /404/ {
    internal;
    random_index on;

    root /etc/nginx/epage.d;
}

location /40x/ {
    internal;
    random_index on;

    root /etc/nginx/epage.d;

    # Replace the placeholders in response content
    # for showing the corresponding status and message.
    sub_filter '{{status}}' '$status';
    sub_filter '{{status_msg}}' '$status_msg';
    sub_filter_once off;
}

location /50x/ {
    internal;
    random_index on;

    root /etc/nginx/epage.d;

    # Replace the placeholders in response content
    # for showing the corresponding status and message.
    sub_filter '{{status}}' '$status';
    sub_filter '{{status_msg}}' '$status_msg';
    sub_filter_once off;
}