I have a Nestjs Application which I try to run in a docker container. It all worked fine just until recently where I get the error Parse Error: Missing expected CR after header value. I'm trying to make a http GET Request to a webserver of an IoT device. Furthermore this error occurs only when I run the server-app inside a docker container. When I run it locally on a windows or macos machine everything works fine.

I tried using different versions of nodejs in docker. 14, 16 and 18. This error always comes up, independent of which version I use. I have no idea how I could debug this error, since it only occurs when I serve the app inside a docker container.

This is my dockerfile:

FROM node:slim
RUN mkdir -p /app
WORKDIR /app
COPY src .
COPY package.json .
RUN apt update && apt install python3 make g++ -y
RUN npm install --force
EXPOSE 3000
CMD ["npm", "run", "start:dev"]