No access to the Scratch page.

[mathiasrettich]

Hello Dale Lane,
My name is Mathias Rettich. I'm a teacher at a German high school.
For the next school year, I want to develop a Scratch extension with a group of students for a self-designed ESP32 board. I watched your video on YouTube and tried to get Scratch running on our Docker server.

I saw that it works on your website https://machinelearningforkids.co.uk/scratch/.

For now, I've tried getting Scratch running on Docker.

Unfortunately, I keep getting the "Invalid Host header" message. Can you give me some advice?

Here's my Dockerfile.

FROM debian:latest

# node.js installieren
RUN 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
WORKDIR /usr/app

RUN npm install -g npm@11.4.2
# get the base Scratch code
RUN git clone --depth=1 https://github.com/LLK/scratch-vm.git
RUN git clone --depth=1 https://github.com/LLK/scratch-gui.git

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

# build Scratch gui
WORKDIR /usr/app/scratch-gui
RUN npm install
RUN npm ln scratch-vm

# copy start.sh
WORKDIR /usr/app
COPY start.sh .
RUN chmod a+x start.sh

EXPOSE 8601

ENTRYPOINT ["./start.sh"]

---

And here's the docker-compose.yml.

services:
  scratch:
    build: .
    restart: always
    ports:
      - "90:8601"
    volumes: 
      - ./:/workspace/scratch-demo

---

Thank you very much for your help,
Mathias