handle assets and requests_pathname_prefix

[boludo00]

So I currently have an API Gateway serving my Dash app under the /dev/ base path.
I have specified my Dash.dash app with

app.config.update({
    # as the proxy server will remove the prefix
    "routes_pathname_prefix": "/", 
    # the front-end will prefix this string to the requests
    # that are made to the proxy server
    'requests_pathname_prefix': '/dev/'
})

and most the app renders fine however, I noticed that the files in my assets directory are not being found since when the app loads, its looking in /assets/ instead of /dev/assets.

This seems like a quick fix on my part, but I'm not sure where to start since this library is so new to me.

[T4rk1n]

Have routes and requests the same value /dev/, in your gateway you can proxy to host/dev/ instead of just host/.

[T4rk1n]

@boludo00 Can you try dash version 0.35.3 and see if it fixes your issue ?

[oskardcmn]

I stumbled over the same (or similar) issue with dash=1.0.1. My app is served under host.com/apps/appname/. By setting

app.config.update({
    "routes_pathname_prefix": '', 
    'requests_pathname_prefix': ''
})

all internal assets are served fine (aka relatively to the dash app page's location).

<script src="_dash-component-suites/dash_renderer/dash_renderer.min.js?v=1.0.0&amp;m=1564659726"></script>

But the files automatically served via the assets/ folder mechanism are not found (404), since their href is set to an absolute location.

<link rel="icon" type="image/x-icon" href="/assets/favicon.ico?m=1564567628.0714939">
<link rel="stylesheet" href="/assets/globalloading.css?m=1564567628.0714939">

Setting assets_url_path='assets' does not help, as the slash is always added as prefix.

A similar observation was made here: https://community.plot.ly/t/assets-folder-not-found-in-docker/14673/8