docker-comopse with react/node.js (express) / mongodb retuns ERR_EMPTY_RESPONSE localhost:3001

✔　30$ is my expectation

does somebody help me . this doesnt work . i will attach only

react -----------------------------> express ( node.js ) ------> mogo
http://localhost:3001/ mongodb://localhost:27017

============
react
============
function addTodo(text) {
fetch("http://localhost:3001/", {
headers: {
~~~~
},

============
express (node.js)
database.client = await MongoClient.connect('mongodb://localhost:27017/todo', { useUnifiedTopology: true });
============

i checked docker-compse.yml 's hostname or .env or something