servermiddleware routes are not recognized in production

My application communicates with several miscroservices, and I need to "hide" the API routes from the client, I'm trying the servermiddleware approach, on site it works, but when I go up to production it recognizes the route as being from the front and returns an html.

* code snippet: server-middleware/proxy.js *

const express = require("express");
const { createProxyMiddleware } = require("http-proxy-middleware");

const app = express();

app.use(
  "/api/notifications",
  createProxyMiddleware({
    target: process.env.API_NOTIFICATIONS,
    changeOrigin: true,
  })
);
app.use(
  "/api/customers",
  createProxyMiddleware({
    target: process.env.API_CUSTOMERS,
    changeOrigin: true,
  })
);

module.exports = app;

const express = require("express");
const { createProxyMiddleware } = require("http-proxy-middleware");

const app = express();

app.use(
  "/api/notifications",
  createProxyMiddleware({
    target: process.env.API_NOTIFICATIONS,
    changeOrigin: true,
  })
);
app.use(
  "/api/customers",
  createProxyMiddleware({
    target: process.env.API_CUSTOMERS,
    changeOrigin: true,
  })
);

module.exports = app;

`

call in nuxt.config.js

serverMiddleware: ["~/server-middleware/proxy.js"],

serverMiddleware: ["~/server-middleware/proxy.js"],

servermiddleware routes are not recognized in production

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