Invalid Host header

[mathiasrettich]

Hello,
I tried to install Scratch on a Debian 12 system.

Expected Behavior

http://localhost:8601 shows a Scratch page.
http://192.168.10.15:8601 shows a Scratch page.

Actual Behavior

But http://debian:8601 returns the message Invalid Host header.

Steps to Reproduce

I proceeded as follows:

# as root
# install node.js
apt-get update && apt-get -y dist-upgrade
apt-get install -y curl git
curl -fsSL https://deb.nodesource.com/setup_23.x -o nodesource_setup.sh
bash nodesource_setup.sh
apt-get install -y nodejs

# setup the location of the Scratch code
mkdir -p /usr/app
cd  /usr/app
npm install -g npm@11.4.2

# get the base Scratch code
git clone --depth=1 https://github.com/LLK/scratch-vm.git
git clone --depth=1 https://github.com/LLK/scratch-gui.git

# build Scratch vm
cd /usr/app/scratch-vm
npm install
npm ln

# build Scratch gui
cd /usr/app/scratch-gui
npm install
npm ln scratch-vm
npm start

System Details

I have Debian 12 installed in a virtual machine.

If this is the wrong place for such a question, I apologize.
Thanks in advance,
Mathias

[CST1229]

http://debian:8601

what

[mathiasrettich]

debian ist the URL for 192.168.0.15.