strapi/packages/core/upload/server/controllers/upload-middleware.js

'use strict';

const { resolve } = require('path');
const range = require('koa-range');
const koaStatic = require('koa-static');

module.exports = () => {
  const configPublicPath = strapi.config.get(
    'middleware.settings.public.path',
    strapi.config.paths.static
  );
  const staticDir = resolve(strapi.dirs.root, configPublicPath);

  strapi.server.app.on('error', err => {
    if (err.code === 'EPIPE') {
      // when serving audio or video the browsers sometimes close the connection to go to range requests instead.
      // This causes koa to emit a write EPIPE error. We can ignore it.
      // Right now this ignores it globally and we cannot do much more because it is how koa handles it.
      return;
    }

    strapi.server.app.onerror(err);
  });

  const localServerConfig = strapi.config.get('plugin.upload.providerOptions.localeServer', {});

  strapi.server.routes([
    {
      method: 'GET',
      path: '/uploads/(.*)',
      handler: [range, koaStatic(staticDir, { defer: true, ...localServerConfig })],
      config: { auth: false },
    },
  ]);
};