Why wget is getting just an empty folder? - wget

Question

I am trying to mirror a site index similar to
https://index.gd.workers.dev/
using wget. I run this code
wget -e robots=off --content-on-error --mirror -np -R "index.html*" https://index.gd.workers.dev/
It's giving this output:
--2020-03-11 01:20:05-- http://index.gd.workers.dev/ Resolving index.gd.workers.dev (index.gd.workers.dev)... 104.31.87.133,
104.31.86.133, 2606:4700:3035::681f:5785, ... Connecting to index.gd.workers.dev (index.gd.workers.dev)|104.31.87.133|:80...
connected. HTTP request sent, awaiting response... 200 OK Length: 361
[text/html] Saving to: ‘index.gd.workers.dev/index.html.tmp’
index.gd.workers.de 100%[===================>] 361 --.-KB/s in
0s
Last-modified header missing -- time-stamps turned off. 2020-03-11
01:20:05 (2.1 MB/s) - ‘index.gd.workers.dev/index.html.tmp’ saved
[361/361]
Removing index.gd.workers.dev/index.html.tmp since it should be
rejected.
FINISHED --2020-03-11 01:20:05-- Total wall clock time: 0.1s
Downloaded: 1 files, 361 in 0s (2.1 MB/s)
The end result is just a folder with the site name and nothing inside it. What am I doing wrong here? and is there any other way to mirror the directory?