Get a picture from the server and display it in <img src> (node.js, react.js)

I want to get a picture of '7.jpg', which is stored in the root folder of the server on node.js (along with the main file main.js).

I address from the client on react.js so:

<img src={ `http://localhost:8080/7.jpg` } /> 

I get the error: 404 NOT FOUND.

Tell me, please, what am I doing wrong?