Docker proper redirect link - node.js

Question

I have Dockerfile:
FROM cloudron/base:0.10.0
ENV PATH /usr/local/node-6.9.5/bin:$PATH
WORKDIR /tmp
COPY package.json /tmp/
RUN npm config set registry http://registry.npmjs.org/ && npm install
WORKDIR /usr/src/app
COPY . /usr/src/app
RUN cp -a /tmp/node_modules /usr/src/app
RUN npm run build
EXPOSE 8000
CMD [ "npm", "run", "start:production" ]
if I run this by:
docker run -p 8000:8000 -t somename/appname
then
going to http://localhost:8000 works fine
but if I want go to http://localhost:8000/about I get error:
Cannot GET /about
What should I do to make it well configured ?
Of course my react app, works fine with such link using in development start.
EDIT:
"scripts": {
"clean": "rimraf dist",
"compile": "node build/scripts/compile",
"build": "npm run clean && cross-env NODE_ENV=production npm run compile",
"start": "cross-env NODE_ENV=development node build/scripts/start",
"start:production": "cross-env NODE_ENV=production node build/scripts/start",
"test": "cross-env NODE_ENV=test karma start build/karma.config",
"test:watch": "npm test -- --watch",
"lint": "eslint .",
"lint:fix": "npm run lint -- --fix"
},
looks like my start:production is not good..