heroku react appcache file causes infinite loop

I'm using a react app that I started from https://github.com/mxstbr/react-boilerplate

It appears when adding url in the browser heroku is creating an infinite loop and adding appcache onto the url more and more until causing it to appear multiple times in a path. Example: 2016-06-02T01:24:50.026167+00:00 heroku[router]: at=info method=GET path="/n/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/appcache/manifest.html" host=url-staging-web.herokuapp.com request_id=a2487d47-0290-4ba2-84cf-89724d6a1f0c fwd="199.21.85.8" dyno=web.1 connect=1ms service=3ms status=200 bytes=1018

 2016-06-01T11:55:25.207312+00:00 heroku[router]: at=info method=GET path="/main.598a2e8a565fe386c390.js" host=url-staging-web.herokuapp.com request_id=38da5e86-da9e-4d39-a5bf-aa6214a385a7 fwd="199.21.85.8" dyno=web.1 connect=0ms service=4ms status=304 bytes=239
    2016-06-01T11:55:25.203874+00:00 heroku[router]: at=info method=GET path="/main.7b77c3177cbc4b4b77cac63e87f9d891.css" host=url-staging-web.herokuapp.com request_id=7964b3d5-bd2a-43aa-ac40-81947a2b75d3 fwd="199.21.85.8" dyno=web.1 connect=1ms service=5ms status=304 bytes=237
    2016-06-01T11:55:25.279982+00:00 heroku[router]: at=info method=GET path="/common.js.2758861beb0dd3750ba7.js" host=url-staging-web.herokuapp.com request_id=1653719a-0632-4e50-907a-d49b54d3c1da fwd="199.21.85.8" dyno=web.1 connect=29ms service=24ms status=304 bytes=237
    2016-06-01T11:55:25.408913+00:00 heroku[router]: at=info method=GET path="/3.b632e03fde1e6d398277.chunk.js" host=url-staging-web.herokuapp.com request_id=1f1e897d-b4d8-48d6-bbcf-22975e1ea3d2 fwd="199.21.85.8" dyno=web.1 connect=1ms service=6ms status=304 bytes=237
    2016-06-01T11:55:25.494888+00:00 heroku[router]: at=info method=GET path="/7ed88ecba65877210015036ac001b02a.jpg" host=url-staging-web.herokuapp.com request_id=98e613b4-e959-49c0-b544-3e52701ffdb1 fwd="199.21.85.8" dyno=web.1 connect=1ms service=3ms status=304 bytes=240
    2016-06-01T11:55:25.586825+00:00 heroku[router]: at=info method=GET path="/n/appcache/appcache/appcache/appcache/manifest.html" host=url-staging-web.herokuapp.com request_id=6b9b0ed6-758e-4429-9526-62052c4c927b fwd="199.21.85.8" dyno=web.1 connect=1ms service=4ms status=200 bytes=1018
    2016-06-01T11:55:25.674844+00:00 heroku[router]: at=info method=GET path="/main.7b77c3177cbc4b4b77cac63e87f9d891.css" host=url-staging-web.herokuapp.com request_id=6448bbab-3cb0-4c82-a331-5786727d444e fwd="199.21.85.8" dyno=web.1 connect=1ms service=2ms status=304 bytes=237
    2016-06-01T11:55:25.678774+00:00 heroku[router]: at=info method=GET path="/main.598a2e8a565fe386c390.js" host=url-staging-web.herokuapp.com request_id=969f2169-5779-4d8c-918e-1d0c9ccb6cfe fwd="199.21.85.8" dyno=web.1 connect=0ms service=2ms status=304 bytes=239
    2016-06-01T11:55:25.742839+00:00 heroku[router]: at=info method=GET path="/common.js.2758861beb0dd3750ba7.js" host=url-staging-web.herokuapp.com request_id=3a002083-3d28-4d66-978a-ddd9b4627698 fwd="199.21.85.8" dyno=web.1 connect=22ms service=27ms status=304 bytes=237
    2016-06-01T11:55:25.862540+00:00 heroku[router]: at=info method=GET path="/3.b632e03fde1e6d398277.chunk.js" host=url-staging-web.herokuapp.com request_id=4527bac9-940d-4dbc-941a-ac7a12c706f4 fwd="199.21.85.8" dyno=web.1 connect=1ms service=3ms status=304 bytes=237
    2016-06-01T11:55:25.948453+00:00 heroku[router]: at=info method=GET path="/7ed88ecba65877210015036ac001b02a.jpg" host=url-staging-web.herokuapp.com request_id=d59cb902-76ba-480f-b351-b803f5aaca0e fwd="199.21.85.8" dyno=web.1 connect=1ms service=4ms status=304 bytes=240
    2016-06-01T11:55:26.044044+00:00 heroku[router]: at=info method=GET path="/n/appcache/appcache/appcache/appcache/appcache/manifest.html" host=url-staging-web.herokuapp.com request_id=edaa6df4-3bfa-4cad-aa70-f20bbf0a917c fwd="199.21.85.8" dyno=web.1 connect=1ms service=4ms status=200 bytes=1018
    2016-06-01T11:55:26.131121+00:00 heroku[router]: at=info method=GET path="/main.7b77c3177cbc4b4b77cac63e87f9d891.css" host=url-staging-web.herokuapp.com request_id=f2018b0c-5d8c-4d26-9b8f-f11987842d23 fwd="199.21.85.8" dyno=web.1 connect=1ms service=2ms status=304 bytes=237
    2016-06-01T11:55:26.135145+00:00 heroku[router]: at=info method=GET path="/main.598a2e8a565fe386c390.js" host=url-staging-web.herokuapp.com request_id=1ba60ddf-1037-4132-9925-493f66a4847c fwd="199.21.85.8" dyno=web.1 connect=0ms service=1ms status=304 bytes=239
    2016-06-01T11:55:26.187981+00:00 heroku[router]: at=info method=GET path="/common.js.2758861beb0dd3750ba7.js" host=url-staging-web.herokuapp.com request_id=e0eb2115-8e30-4bd0-b93e-f4d4214d03ad fwd="199.21.85.8" dyno=web.1 connect=18ms service=21ms status=304 bytes=237
    2016-06-01T11:55:26.309497+00:00 heroku[router]: at=info method=GET path="/3.b632e03fde1e6d398277.chunk.js" host=url-staging-web.herokuapp.com request_id=dc4ab1cd-fbf2-4b03-bb91-2711c8c143c7 fwd="199.21.85.8" dyno=web.1 connect=2ms service=3ms status=304 bytes=237
    2016-06-01T11:55:26.394030+00:00 heroku[router]: at=info method=GET path="/7ed88ecba65877210015036ac001b02a.jpg" host=url-staging-web.herokuapp.com request_id=7ea2a7db-a6ed-4971-9b4c-39c38021cdfe fwd="199.21.85.8" dyno=web.1 connect=1ms service=2ms status=304 bytes=240

UPDATE: Ok I found out it only cause the infinite loop with http and not with https. Weird? On safari it happens whether it's http or https

Solution

I seemed to have fixed it by turning off appcache.

I looked up appcache and MDN say's it shouldn't be used anymore https://developer.mozilla.org/en-US/docs/Web/HTML/Using_the_application_cache

So in offline-plugin config in internals/webpack/webpack.prod.babel.js I added appcache: false

new OfflinePlugin({
  relativePaths: true, // Use generated relative paths by default
  // No need to cache .htaccess. See http://mxs.is/googmp,
  // this is applied before any match in `caches` section
  excludes: ['.htaccess'],
  AppCache: false,

  caches: {
    main: [':rest:'],

    // All chunks marked as `additional`, loaded after main section
    // and do not prevent SW to install. Change to `optional` if
    // do not want them to be preloaded at all (cached only when first loaded)
    additional: ['*.chunk.js'],
  },
}),