Why doesn't proxy work in Webpack's devServer?

Question

JavaScript

I'm trying to set up a dev build so that it sends and receives data from the prod server through a proxy in the Webpack dev server.
In the target key, I specify the address to which the proxy should replace requests to the server, but as a result, requests still go to the address of my localhost, which causes a 500 error to appear in the console. I can't figure out where the error is in the config file:

devServer: {
        contentBase: commonWebpack.externals.path.src,
        watchContentBase: true,
        port: 8080,
        open: true,
        hot: true,
        proxy: {
            '/': {
                target: 'http://mysite.ru',
                changeOrigin: true
            }
        }
    },

Webpack version 4.39.3, http-proxy-middleware version 0.20.0.

Answer 1

I close the question, because the problem turned out to be not in the proxy settings, but in the specifics of processing requests on the server.